yosoyhendrix
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Linux-NetSpeed


			
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  <div itemprop="text" class="blob-wrapper data type-c">
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        <td id="L1" class="blob-num js-line-number" data-line-number="1"></td>
        <td id="LC1" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> tcp_nanqinlang</span></td>
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        <td id="L2" class="blob-num js-line-number" data-line-number="2"></td>
        <td id="LC2" class="blob-code blob-code-inner js-file-line"><span class="pl-c"></span></td>
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        <td id="L3" class="blob-num js-line-number" data-line-number="3"></td>
        <td id="LC3" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * CentOS</span></td>
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        <td id="L4" class="blob-num js-line-number" data-line-number="4"></td>
        <td id="LC4" class="blob-code blob-code-inner js-file-line"><span class="pl-c"></span></td>
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        <td id="L5" class="blob-num js-line-number" data-line-number="5"></td>
        <td id="LC5" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * v4.12.10 mainline kernel</span></td>
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        <td id="L6" class="blob-num js-line-number" data-line-number="6"></td>
        <td id="LC6" class="blob-code blob-code-inner js-file-line"><span class="pl-c"></span></td>
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        <td id="L7" class="blob-num js-line-number" data-line-number="7"></td>
        <td id="LC7" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> × New BBR Congestion Control</span></td>
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        <td id="L8" class="blob-num js-line-number" data-line-number="8"></td>
        <td id="LC8" class="blob-code blob-code-inner js-file-line"><span class="pl-c"></span></td>
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        <td id="L9" class="blob-num js-line-number" data-line-number="9"></td>
        <td id="LC9" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Modified by (C) 2017 nanqinlang</span></td>
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        <td id="L10" class="blob-num js-line-number" data-line-number="10"></td>
        <td id="LC10" class="blob-code blob-code-inner js-file-line"><span class="pl-c"></span></td>
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        <td id="L11" class="blob-num js-line-number" data-line-number="11"></td>
        <td id="LC11" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *******************************************************************************</span></td>
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        <td id="L12" class="blob-num js-line-number" data-line-number="12"></td>
        <td id="LC12" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Bottleneck Bandwidth and RTT (BBR) congestion control</span></td>
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        <td id="L13" class="blob-num js-line-number" data-line-number="13"></td>
        <td id="LC13" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L14" class="blob-num js-line-number" data-line-number="14"></td>
        <td id="LC14" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * BBR congestion control computes the sending rate based on the delivery</span></td>
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        <td id="L15" class="blob-num js-line-number" data-line-number="15"></td>
        <td id="LC15" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * rate (throughput) estimated from ACKs. In a nutshell:</span></td>
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        <td id="L16" class="blob-num js-line-number" data-line-number="16"></td>
        <td id="LC16" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L17" class="blob-num js-line-number" data-line-number="17"></td>
        <td id="LC17" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   On each ACK, update our model of the network path:</span></td>
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        <td id="L18" class="blob-num js-line-number" data-line-number="18"></td>
        <td id="LC18" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *      bottleneck_bandwidth = windowed_max(delivered / elapsed, 10 round trips)</span></td>
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        <td id="L19" class="blob-num js-line-number" data-line-number="19"></td>
        <td id="LC19" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *      min_rtt = windowed_min(rtt, 10 seconds)</span></td>
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        <td id="L20" class="blob-num js-line-number" data-line-number="20"></td>
        <td id="LC20" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   pacing_rate = pacing_gain * bottleneck_bandwidth</span></td>
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        <td id="L21" class="blob-num js-line-number" data-line-number="21"></td>
        <td id="LC21" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   cwnd = max(cwnd_gain * bottleneck_bandwidth * min_rtt, 4)</span></td>
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        <td id="L22" class="blob-num js-line-number" data-line-number="22"></td>
        <td id="LC22" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L23" class="blob-num js-line-number" data-line-number="23"></td>
        <td id="LC23" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * The core algorithm does not react directly to packet losses or delays,</span></td>
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        <td id="L24" class="blob-num js-line-number" data-line-number="24"></td>
        <td id="LC24" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * although BBR may adjust the size of next send per ACK when loss is</span></td>
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        <td id="L25" class="blob-num js-line-number" data-line-number="25"></td>
        <td id="LC25" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * observed, or adjust the sending rate if it estimates there is a</span></td>
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        <td id="L26" class="blob-num js-line-number" data-line-number="26"></td>
        <td id="LC26" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * traffic policer, in order to keep the drop rate reasonable.</span></td>
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        <td id="L27" class="blob-num js-line-number" data-line-number="27"></td>
        <td id="LC27" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L28" class="blob-num js-line-number" data-line-number="28"></td>
        <td id="LC28" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Here is a state transition diagram for BBR:</span></td>
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        <td id="L29" class="blob-num js-line-number" data-line-number="29"></td>
        <td id="LC29" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L30" class="blob-num js-line-number" data-line-number="30"></td>
        <td id="LC30" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *             |</span></td>
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        <td id="L31" class="blob-num js-line-number" data-line-number="31"></td>
        <td id="LC31" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *             V</span></td>
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        <td id="L32" class="blob-num js-line-number" data-line-number="32"></td>
        <td id="LC32" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    +---&gt; STARTUP  ----+</span></td>
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        <td id="L33" class="blob-num js-line-number" data-line-number="33"></td>
        <td id="LC33" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |        |         |</span></td>
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        <td id="L34" class="blob-num js-line-number" data-line-number="34"></td>
        <td id="LC34" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |        V         |</span></td>
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        <td id="L35" class="blob-num js-line-number" data-line-number="35"></td>
        <td id="LC35" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |      DRAIN   ----+</span></td>
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        <td id="L36" class="blob-num js-line-number" data-line-number="36"></td>
        <td id="LC36" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |        |         |</span></td>
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        <td id="L37" class="blob-num js-line-number" data-line-number="37"></td>
        <td id="LC37" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |        V         |</span></td>
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        <td id="L38" class="blob-num js-line-number" data-line-number="38"></td>
        <td id="LC38" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    +---&gt; PROBE_BW ----+</span></td>
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        <td id="L39" class="blob-num js-line-number" data-line-number="39"></td>
        <td id="LC39" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |      ^    |      |</span></td>
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        <td id="L40" class="blob-num js-line-number" data-line-number="40"></td>
        <td id="LC40" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |      |    |      |</span></td>
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        <td id="L41" class="blob-num js-line-number" data-line-number="41"></td>
        <td id="LC41" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |      +----+      |</span></td>
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        <td id="L42" class="blob-num js-line-number" data-line-number="42"></td>
        <td id="LC42" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    |                  |</span></td>
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        <td id="L43" class="blob-num js-line-number" data-line-number="43"></td>
        <td id="LC43" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *    +---- PROBE_RTT &lt;--+</span></td>
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        <td id="L44" class="blob-num js-line-number" data-line-number="44"></td>
        <td id="LC44" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L45" class="blob-num js-line-number" data-line-number="45"></td>
        <td id="LC45" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * A BBR flow starts in STARTUP, and ramps up its sending rate quickly.</span></td>
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        <td id="L46" class="blob-num js-line-number" data-line-number="46"></td>
        <td id="LC46" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * When it estimates the pipe is full, it enters DRAIN to drain the queue.</span></td>
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        <td id="L47" class="blob-num js-line-number" data-line-number="47"></td>
        <td id="LC47" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * In steady state a BBR flow only uses PROBE_BW and PROBE_RTT.</span></td>
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        <td id="L48" class="blob-num js-line-number" data-line-number="48"></td>
        <td id="LC48" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * A long-lived BBR flow spends the vast majority of its time remaining</span></td>
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        <td id="L49" class="blob-num js-line-number" data-line-number="49"></td>
        <td id="LC49" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * (repeatedly) in PROBE_BW, fully probing and utilizing the pipe&#39;s bandwidth</span></td>
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        <td id="L50" class="blob-num js-line-number" data-line-number="50"></td>
        <td id="LC50" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * in a fair manner, with a small, bounded queue. *If* a flow has been</span></td>
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        <td id="L51" class="blob-num js-line-number" data-line-number="51"></td>
        <td id="LC51" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * continuously sending for the entire min_rtt window, and hasn&#39;t seen an RTT</span></td>
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        <td id="L52" class="blob-num js-line-number" data-line-number="52"></td>
        <td id="LC52" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * sample that matches or decreases its min_rtt estimate for 10 seconds, then</span></td>
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        <td id="L53" class="blob-num js-line-number" data-line-number="53"></td>
        <td id="LC53" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * it briefly enters PROBE_RTT to cut inflight to a minimum value to re-probe</span></td>
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        <td id="L54" class="blob-num js-line-number" data-line-number="54"></td>
        <td id="LC54" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * the path&#39;s two-way propagation delay (min_rtt). When exiting PROBE_RTT, if</span></td>
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        <td id="L55" class="blob-num js-line-number" data-line-number="55"></td>
        <td id="LC55" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * we estimated that we reached the full bw of the pipe then we enter PROBE_BW;</span></td>
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        <td id="L56" class="blob-num js-line-number" data-line-number="56"></td>
        <td id="LC56" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * otherwise we enter STARTUP to try to fill the pipe.</span></td>
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        <td id="L57" class="blob-num js-line-number" data-line-number="57"></td>
        <td id="LC57" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L58" class="blob-num js-line-number" data-line-number="58"></td>
        <td id="LC58" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * BBR is described in detail in:</span></td>
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        <td id="L59" class="blob-num js-line-number" data-line-number="59"></td>
        <td id="LC59" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   &quot;BBR: Congestion-Based Congestion Control&quot;,</span></td>
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        <td id="L60" class="blob-num js-line-number" data-line-number="60"></td>
        <td id="LC60" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   Neal Cardwell, Yuchung Cheng, C. Stephen Gunn, Soheil Hassas Yeganeh,</span></td>
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        <td id="L61" class="blob-num js-line-number" data-line-number="61"></td>
        <td id="LC61" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   Van Jacobson. ACM Queue, Vol. 14 No. 5, September-October 2016.</span></td>
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        <td id="L62" class="blob-num js-line-number" data-line-number="62"></td>
        <td id="LC62" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L63" class="blob-num js-line-number" data-line-number="63"></td>
        <td id="LC63" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * There is a public e-mail list for discussing BBR development and testing:</span></td>
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        <td id="L64" class="blob-num js-line-number" data-line-number="64"></td>
        <td id="LC64" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   https://groups.google.com/forum/#!forum/bbr-dev</span></td>
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        <td id="L65" class="blob-num js-line-number" data-line-number="65"></td>
        <td id="LC65" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
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        <td id="L66" class="blob-num js-line-number" data-line-number="66"></td>
        <td id="LC66" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * NOTE: BBR *must* be used with the fq qdisc (&quot;man tc-fq&quot;) with pacing enabled,</span></td>
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        <td id="L67" class="blob-num js-line-number" data-line-number="67"></td>
        <td id="LC67" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * since pacing is integral to the BBR design and implementation.</span></td>
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        <td id="L68" class="blob-num js-line-number" data-line-number="68"></td>
        <td id="LC68" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * BBR without pacing would not function properly, and may incur unnecessary</span></td>
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        <td id="L69" class="blob-num js-line-number" data-line-number="69"></td>
        <td id="LC69" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * high packet loss rates.</span></td>
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        <td id="L70" class="blob-num js-line-number" data-line-number="70"></td>
        <td id="LC70" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
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        <td id="LC71" class="blob-code blob-code-inner js-file-line">
</td>
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        <td id="L72" class="blob-num js-line-number" data-line-number="72"></td>
        <td id="LC72" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>linux/module.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L73" class="blob-num js-line-number" data-line-number="73"></td>
        <td id="LC73" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>linux/inet.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L74" class="blob-num js-line-number" data-line-number="74"></td>
        <td id="LC74" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>linux/inet_diag.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L75" class="blob-num js-line-number" data-line-number="75"></td>
        <td id="LC75" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>linux/random.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L76" class="blob-num js-line-number" data-line-number="76"></td>
        <td id="LC76" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>linux/win_minmax.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L77" class="blob-num js-line-number" data-line-number="77"></td>
        <td id="LC77" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">include</span> <span class="pl-s"><span class="pl-pds">&lt;</span>net/tcp.h<span class="pl-pds">&gt;</span></span></td>
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        <td id="L78" class="blob-num js-line-number" data-line-number="78"></td>
        <td id="LC78" class="blob-code blob-code-inner js-file-line">
</td>
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        <td id="L79" class="blob-num js-line-number" data-line-number="79"></td>
        <td id="LC79" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Scale factor for rate in pkt/uSec unit to avoid truncation in bandwidth</span></td>
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        <td id="L80" class="blob-num js-line-number" data-line-number="80"></td>
        <td id="LC80" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * estimation. The rate unit ~= (1500 bytes / 1 usec / 2^24) ~= 715 bps.</span></td>
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        <td id="L81" class="blob-num js-line-number" data-line-number="81"></td>
        <td id="LC81" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * This handles bandwidths from 0.06pps (715bps) to 256Mpps (3Tbps) in a u32.</span></td>
      </tr>
      <tr>
        <td id="L82" class="blob-num js-line-number" data-line-number="82"></td>
        <td id="LC82" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Since the minimum window is &gt;=4 packets, the lower bound isn&#39;t</span></td>
      </tr>
      <tr>
        <td id="L83" class="blob-num js-line-number" data-line-number="83"></td>
        <td id="LC83" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * an issue. The upper bound isn&#39;t an issue with existing technologies.</span></td>
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      <tr>
        <td id="L84" class="blob-num js-line-number" data-line-number="84"></td>
        <td id="LC84" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L85" class="blob-num js-line-number" data-line-number="85"></td>
        <td id="LC85" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">define</span> <span class="pl-en">BW_SCALE</span>  <span class="pl-c1">24</span></td>
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      <tr>
        <td id="L86" class="blob-num js-line-number" data-line-number="86"></td>
        <td id="LC86" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">define</span> <span class="pl-en">BW_UNIT</span>   (<span class="pl-c1">1</span> &lt;&lt; BW_SCALE)</td>
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      <tr>
        <td id="L87" class="blob-num js-line-number" data-line-number="87"></td>
        <td id="LC87" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L88" class="blob-num js-line-number" data-line-number="88"></td>
        <td id="LC88" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">define</span> <span class="pl-en">BBR_SCALE</span> <span class="pl-c1">8</span>	<span class="pl-c"><span class="pl-c">/*</span> scaling factor for fractions in BBR (e.g. gains) <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L89" class="blob-num js-line-number" data-line-number="89"></td>
        <td id="LC89" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">define</span> <span class="pl-en">BBR_UNIT</span>  (<span class="pl-c1">1</span> &lt;&lt; BBR_SCALE)</td>
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      <tr>
        <td id="L90" class="blob-num js-line-number" data-line-number="90"></td>
        <td id="LC90" class="blob-code blob-code-inner js-file-line">
</td>
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      <tr>
        <td id="L91" class="blob-num js-line-number" data-line-number="91"></td>
        <td id="LC91" class="blob-code blob-code-inner js-file-line">#<span class="pl-k">define</span> <span class="pl-en">CYCLE_LEN</span> <span class="pl-c1">8</span>	<span class="pl-c"><span class="pl-c">/*</span> number of phases in a pacing gain cycle <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L92" class="blob-num js-line-number" data-line-number="92"></td>
        <td id="LC92" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L93" class="blob-num js-line-number" data-line-number="93"></td>
        <td id="LC93" class="blob-code blob-code-inner js-file-line">
</td>
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      <tr>
        <td id="L94" class="blob-num js-line-number" data-line-number="94"></td>
        <td id="LC94" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> **************************************************************************</span></td>
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      <tr>
        <td id="L95" class="blob-num js-line-number" data-line-number="95"></td>
        <td id="LC95" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> the following is the main</span></td>
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      <tr>
        <td id="L96" class="blob-num js-line-number" data-line-number="96"></td>
        <td id="LC96" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> **************************************************************************</span></td>
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      <tr>
        <td id="L97" class="blob-num js-line-number" data-line-number="97"></td>
        <td id="LC97" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L98" class="blob-num js-line-number" data-line-number="98"></td>
        <td id="LC98" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L99" class="blob-num js-line-number" data-line-number="99"></td>
        <td id="LC99" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> BBR has the following modes for deciding how fast to send: <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L100" class="blob-num js-line-number" data-line-number="100"></td>
        <td id="LC100" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> four working mode</span></td>
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      <tr>
        <td id="L101" class="blob-num js-line-number" data-line-number="101"></td>
        <td id="LC101" class="blob-code blob-code-inner js-file-line"><span class="pl-k">enum</span> bbr_mode {</td>
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      <tr>
        <td id="L102" class="blob-num js-line-number" data-line-number="102"></td>
        <td id="LC102" class="blob-code blob-code-inner js-file-line">	BBR_STARTUP,	<span class="pl-c"><span class="pl-c">/*</span> ramp up sending rate rapidly to fill pipe <span class="pl-c">*/</span></span></td>
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        <td id="L103" class="blob-num js-line-number" data-line-number="103"></td>
        <td id="LC103" class="blob-code blob-code-inner js-file-line">	BBR_DRAIN,	    <span class="pl-c"><span class="pl-c">/*</span> drain any queue created during startup <span class="pl-c">*/</span></span></td>
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        <td id="L104" class="blob-num js-line-number" data-line-number="104"></td>
        <td id="LC104" class="blob-code blob-code-inner js-file-line">	BBR_PROBE_BW,	<span class="pl-c"><span class="pl-c">/*</span> discover, share bw: pace around estimated bw <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L105" class="blob-num js-line-number" data-line-number="105"></td>
        <td id="LC105" class="blob-code blob-code-inner js-file-line">	BBR_PROBE_RTT,	<span class="pl-c"><span class="pl-c">/*</span> cut cwnd to min to probe min_rtt <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L106" class="blob-num js-line-number" data-line-number="106"></td>
        <td id="LC106" class="blob-code blob-code-inner js-file-line">};</td>
      </tr>
      <tr>
        <td id="L107" class="blob-num js-line-number" data-line-number="107"></td>
        <td id="LC107" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L108" class="blob-num js-line-number" data-line-number="108"></td>
        <td id="LC108" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L109" class="blob-num js-line-number" data-line-number="109"></td>
        <td id="LC109" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> BBR congestion control block <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L110" class="blob-num js-line-number" data-line-number="110"></td>
        <td id="LC110" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> control block with u32 values you set</span></td>
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      <tr>
        <td id="L111" class="blob-num js-line-number" data-line-number="111"></td>
        <td id="LC111" class="blob-code blob-code-inner js-file-line"><span class="pl-k">struct</span> bbr {</td>
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      <tr>
        <td id="L112" class="blob-num js-line-number" data-line-number="112"></td>
        <td id="LC112" class="blob-code blob-code-inner js-file-line">	u32	min_rtt_us;	             	 <span class="pl-c"><span class="pl-c">/*</span> min RTT in min_rtt_win_sec window <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L113" class="blob-num js-line-number" data-line-number="113"></td>
        <td id="LC113" class="blob-code blob-code-inner js-file-line">	u32	min_rtt_stamp;	             <span class="pl-c"><span class="pl-c">/*</span> timestamp of min_rtt_us <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L114" class="blob-num js-line-number" data-line-number="114"></td>
        <td id="LC114" class="blob-code blob-code-inner js-file-line">	u32	probe_rtt_done_stamp;        <span class="pl-c"><span class="pl-c">/*</span> end time for BBR_PROBE_RTT mode <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L115" class="blob-num js-line-number" data-line-number="115"></td>
        <td id="LC115" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> minmax bw;		         <span class="pl-c"><span class="pl-c">/*</span> Max recent delivery rate in pkts/uS &lt;&lt; 24 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L116" class="blob-num js-line-number" data-line-number="116"></td>
        <td id="LC116" class="blob-code blob-code-inner js-file-line">	u32	rtt_cnt;	    	         <span class="pl-c"><span class="pl-c">/*</span> count of packet-timed rounds elapsed <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L117" class="blob-num js-line-number" data-line-number="117"></td>
        <td id="LC117" class="blob-code blob-code-inner js-file-line">	u32 next_rtt_delivered;          <span class="pl-c"><span class="pl-c">/*</span> scb-&gt;tx.delivered at end of round <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L118" class="blob-num js-line-number" data-line-number="118"></td>
        <td id="LC118" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> skb_mstamp cycle_mstamp;  <span class="pl-c"><span class="pl-c">/*</span> time of this cycle phase start <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L119" class="blob-num js-line-number" data-line-number="119"></td>
        <td id="LC119" class="blob-code blob-code-inner js-file-line">	u32	mode:<span class="pl-c1">3</span>,		     	 <span class="pl-c"><span class="pl-c">/*</span> current bbr_mode in state machine <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L120" class="blob-num js-line-number" data-line-number="120"></td>
        <td id="LC120" class="blob-code blob-code-inner js-file-line">		prev_ca_state:<span class="pl-c1">3</span>,        <span class="pl-c"><span class="pl-c">/*</span> CA state on previous ACK <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L121" class="blob-num js-line-number" data-line-number="121"></td>
        <td id="LC121" class="blob-code blob-code-inner js-file-line">		packet_conservation:<span class="pl-c1">1</span>,  <span class="pl-c"><span class="pl-c">/*</span> use packet conservation? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L122" class="blob-num js-line-number" data-line-number="122"></td>
        <td id="LC122" class="blob-code blob-code-inner js-file-line">		restore_cwnd:<span class="pl-c1">1</span>,	        <span class="pl-c"><span class="pl-c">/*</span> decided to revert cwnd to old value <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L123" class="blob-num js-line-number" data-line-number="123"></td>
        <td id="LC123" class="blob-code blob-code-inner js-file-line">		round_start:<span class="pl-c1">1</span>,	        <span class="pl-c"><span class="pl-c">/*</span> start of packet-timed tx-&gt;ack round? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L124" class="blob-num js-line-number" data-line-number="124"></td>
        <td id="LC124" class="blob-code blob-code-inner js-file-line">		tso_segs_goal:<span class="pl-c1">7</span>,        <span class="pl-c"><span class="pl-c">/*</span> segments we want in each skb we send <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L125" class="blob-num js-line-number" data-line-number="125"></td>
        <td id="LC125" class="blob-code blob-code-inner js-file-line">		idle_restart:<span class="pl-c1">1</span>,	        <span class="pl-c"><span class="pl-c">/*</span> restarting after idle? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L126" class="blob-num js-line-number" data-line-number="126"></td>
        <td id="LC126" class="blob-code blob-code-inner js-file-line">		probe_rtt_round_done:<span class="pl-c1">1</span>, <span class="pl-c"><span class="pl-c">/*</span> a BBR_PROBE_RTT round at 4 pkts? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L127" class="blob-num js-line-number" data-line-number="127"></td>
        <td id="LC127" class="blob-code blob-code-inner js-file-line">		unused:<span class="pl-c1">5</span>,</td>
      </tr>
      <tr>
        <td id="L128" class="blob-num js-line-number" data-line-number="128"></td>
        <td id="LC128" class="blob-code blob-code-inner js-file-line">		lt_is_sampling:<span class="pl-c1">1</span>,       <span class="pl-c"><span class="pl-c">/*</span> taking long-term (&quot;LT&quot;) samples now? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L129" class="blob-num js-line-number" data-line-number="129"></td>
        <td id="LC129" class="blob-code blob-code-inner js-file-line">		lt_rtt_cnt:<span class="pl-c1">7</span>,	        <span class="pl-c"><span class="pl-c">/*</span> round trips in long-term interval <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L130" class="blob-num js-line-number" data-line-number="130"></td>
        <td id="LC130" class="blob-code blob-code-inner js-file-line">		lt_use_bw:<span class="pl-c1">1</span>;	        <span class="pl-c"><span class="pl-c">/*</span> use lt_bw as our bw estimate? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L131" class="blob-num js-line-number" data-line-number="131"></td>
        <td id="LC131" class="blob-code blob-code-inner js-file-line">	u32	lt_bw;		         <span class="pl-c"><span class="pl-c">/*</span> LT est delivery rate in pkts/uS &lt;&lt; 24 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L132" class="blob-num js-line-number" data-line-number="132"></td>
        <td id="LC132" class="blob-code blob-code-inner js-file-line">	u32	lt_last_delivered;   <span class="pl-c"><span class="pl-c">/*</span> LT intvl start: tp-&gt;delivered <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L133" class="blob-num js-line-number" data-line-number="133"></td>
        <td id="LC133" class="blob-code blob-code-inner js-file-line">	u32	lt_last_stamp;	     <span class="pl-c"><span class="pl-c">/*</span> LT intvl start: tp-&gt;delivered_mstamp <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L134" class="blob-num js-line-number" data-line-number="134"></td>
        <td id="LC134" class="blob-code blob-code-inner js-file-line">	u32	lt_last_lost;	     <span class="pl-c"><span class="pl-c">/*</span> LT intvl start: tp-&gt;lost <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L135" class="blob-num js-line-number" data-line-number="135"></td>
        <td id="LC135" class="blob-code blob-code-inner js-file-line">	u32	pacing_gain:<span class="pl-c1">10</span>,	     <span class="pl-c"><span class="pl-c">/*</span> current gain for setting pacing rate <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L136" class="blob-num js-line-number" data-line-number="136"></td>
        <td id="LC136" class="blob-code blob-code-inner js-file-line">		cwnd_gain:<span class="pl-c1">10</span>,	        <span class="pl-c"><span class="pl-c">/*</span> current gain for setting cwnd <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L137" class="blob-num js-line-number" data-line-number="137"></td>
        <td id="LC137" class="blob-code blob-code-inner js-file-line">		full_bw_cnt:<span class="pl-c1">3</span>,	        <span class="pl-c"><span class="pl-c">/*</span> number of rounds without large bw gains <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L138" class="blob-num js-line-number" data-line-number="138"></td>
        <td id="LC138" class="blob-code blob-code-inner js-file-line">		cycle_idx:<span class="pl-c1">3</span>,	        <span class="pl-c"><span class="pl-c">/*</span> current index in pacing_gain cycle array <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L139" class="blob-num js-line-number" data-line-number="139"></td>
        <td id="LC139" class="blob-code blob-code-inner js-file-line">		unused_b:<span class="pl-c1">5</span>;</td>
      </tr>
      <tr>
        <td id="L140" class="blob-num js-line-number" data-line-number="140"></td>
        <td id="LC140" class="blob-code blob-code-inner js-file-line">	u32	prior_cwnd;	  	     <span class="pl-c"><span class="pl-c">/*</span> prior cwnd upon entering loss recovery <span class="pl-c">*/</span></span></td>
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      <tr>
        <td id="L141" class="blob-num js-line-number" data-line-number="141"></td>
        <td id="LC141" class="blob-code blob-code-inner js-file-line">	u32	full_bw;	  	     <span class="pl-c"><span class="pl-c">/*</span> recent bw, to estimate if pipe is full <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L142" class="blob-num js-line-number" data-line-number="142"></td>
        <td id="LC142" class="blob-code blob-code-inner js-file-line">};</td>
      </tr>
      <tr>
        <td id="L143" class="blob-num js-line-number" data-line-number="143"></td>
        <td id="LC143" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L144" class="blob-num js-line-number" data-line-number="144"></td>
        <td id="LC144" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L145" class="blob-num js-line-number" data-line-number="145"></td>
        <td id="LC145" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Window length of bw filter (in rounds): <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L146" class="blob-num js-line-number" data-line-number="146"></td>
        <td id="LC146" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> according to the above define: &quot;#define CYCLE_LEN 8&quot;</span></td>
      </tr>
      <tr>
        <td id="L147" class="blob-num js-line-number" data-line-number="147"></td>
        <td id="LC147" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> default is &quot;+2&quot;</span></td>
      </tr>
      <tr>
        <td id="L148" class="blob-num js-line-number" data-line-number="148"></td>
        <td id="LC148" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_bw_rtts = CYCLE_LEN + <span class="pl-c1">2</span>;</td>
      </tr>
      <tr>
        <td id="L149" class="blob-num js-line-number" data-line-number="149"></td>
        <td id="LC149" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Window length of min_rtt filter (in sec): <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L150" class="blob-num js-line-number" data-line-number="150"></td>
        <td id="LC150" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> minimum RTT</span></td>
      </tr>
      <tr>
        <td id="L151" class="blob-num js-line-number" data-line-number="151"></td>
        <td id="LC151" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> default is 10 seconds</span></td>
      </tr>
      <tr>
        <td id="L152" class="blob-num js-line-number" data-line-number="152"></td>
        <td id="LC152" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_min_rtt_win_sec = <span class="pl-c1">10</span>;</td>
      </tr>
      <tr>
        <td id="L153" class="blob-num js-line-number" data-line-number="153"></td>
        <td id="LC153" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Minimum time (in ms) spent at bbr_cwnd_min_target in BBR_PROBE_RTT mode: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L154" class="blob-num js-line-number" data-line-number="154"></td>
        <td id="LC154" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> minimum time of keeping in BBR_DRAIN mode</span></td>
      </tr>
      <tr>
        <td id="L155" class="blob-num js-line-number" data-line-number="155"></td>
        <td id="LC155" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> default is 200 ms</span></td>
      </tr>
      <tr>
        <td id="L156" class="blob-num js-line-number" data-line-number="156"></td>
        <td id="LC156" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> i set it as 100 ms, decrease minimum drain&#39;s time to early switch to BBR_PROBE_BW mode</span></td>
      </tr>
      <tr>
        <td id="L157" class="blob-num js-line-number" data-line-number="157"></td>
        <td id="LC157" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_probe_rtt_mode_ms = <span class="pl-c1">100</span>;</td>
      </tr>
      <tr>
        <td id="L158" class="blob-num js-line-number" data-line-number="158"></td>
        <td id="LC158" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Skip TSO below the following bandwidth (bits/sec): <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L159" class="blob-num js-line-number" data-line-number="159"></td>
        <td id="LC159" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_min_tso_rate = <span class="pl-c1">1200000</span>;</td>
      </tr>
      <tr>
        <td id="L160" class="blob-num js-line-number" data-line-number="160"></td>
        <td id="LC160" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L161" class="blob-num js-line-number" data-line-number="161"></td>
        <td id="LC161" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> We use a high_gain value of 2/ln(2) because it&#39;s the smallest pacing gain</span></td>
      </tr>
      <tr>
        <td id="L162" class="blob-num js-line-number" data-line-number="162"></td>
        <td id="LC162" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * that will allow a smoothly increasing pacing rate that will double each RTT</span></td>
      </tr>
      <tr>
        <td id="L163" class="blob-num js-line-number" data-line-number="163"></td>
        <td id="LC163" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * and send the same number of packets per RTT that an un-paced, slow-starting</span></td>
      </tr>
      <tr>
        <td id="L164" class="blob-num js-line-number" data-line-number="164"></td>
        <td id="LC164" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Reno or CUBIC flow would:</span></td>
      </tr>
      <tr>
        <td id="L165" class="blob-num js-line-number" data-line-number="165"></td>
        <td id="LC165" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L166" class="blob-num js-line-number" data-line-number="166"></td>
        <td id="LC166" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> defaultlt use [2885/1000 + 1] to balance high gain pacing</span></td>
      </tr>
      <tr>
        <td id="L167" class="blob-num js-line-number" data-line-number="167"></td>
        <td id="LC167" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> i set it as [3 + 1]</span></td>
      </tr>
      <tr>
        <td id="L168" class="blob-num js-line-number" data-line-number="168"></td>
        <td id="LC168" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_high_gain  = BBR_UNIT * <span class="pl-c1">3000</span> / <span class="pl-c1">1000</span> + <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L169" class="blob-num js-line-number" data-line-number="169"></td>
        <td id="LC169" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> The pacing gain of 1/high_gain in BBR_DRAIN is calculated to typically drain</span></td>
      </tr>
      <tr>
        <td id="L170" class="blob-num js-line-number" data-line-number="170"></td>
        <td id="LC170" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * the queue created in BBR_STARTUP in a single round:</span></td>
      </tr>
      <tr>
        <td id="L171" class="blob-num js-line-number" data-line-number="171"></td>
        <td id="LC171" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L172" class="blob-num js-line-number" data-line-number="172"></td>
        <td id="LC172" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> according to above, set this as [3 + 1]</span></td>
      </tr>
      <tr>
        <td id="L173" class="blob-num js-line-number" data-line-number="173"></td>
        <td id="LC173" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_drain_gain = BBR_UNIT * <span class="pl-c1">1000</span> / <span class="pl-c1">3000</span>;</td>
      </tr>
      <tr>
        <td id="L174" class="blob-num js-line-number" data-line-number="174"></td>
        <td id="LC174" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> The gain for deriving steady-state cwnd tolerates delayed/stretched ACKs: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L175" class="blob-num js-line-number" data-line-number="175"></td>
        <td id="LC175" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> BBR takes [the calculated BDP]*2 as congestion-window</span></td>
      </tr>
      <tr>
        <td id="L176" class="blob-num js-line-number" data-line-number="176"></td>
        <td id="LC176" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> when is in BBR_PROBE_BW mode, calculating pacing-rate-which-used-by-cwnd is not based on &quot;bbr_pacing_gain&quot; number-group, but unvariable [BBR_UNIT * 2]</span></td>
      </tr>
      <tr>
        <td id="L177" class="blob-num js-line-number" data-line-number="177"></td>
        <td id="LC177" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_cwnd_gain  = BBR_UNIT * <span class="pl-c1">2</span>;</td>
      </tr>
      <tr>
        <td id="L178" class="blob-num js-line-number" data-line-number="178"></td>
        <td id="LC178" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> The pacing_gain values for the PROBE_BW gain cycle, to discover/share bw: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L179" class="blob-num js-line-number" data-line-number="179"></td>
        <td id="LC179" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> <span class="pl-k">int</span> bbr_pacing_gain[] = {</td>
      </tr>
      <tr>
        <td id="L180" class="blob-num js-line-number" data-line-number="180"></td>
        <td id="LC180" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> for the stable bbr mode &quot;BBR_PROBE_BW&quot; which makes the fastest speed mode.</span></td>
      </tr>
      <tr>
        <td id="L181" class="blob-num js-line-number" data-line-number="181"></td>
        <td id="LC181" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> there are 8 pacing rate</span></td>
      </tr>
      <tr>
        <td id="L182" class="blob-num js-line-number" data-line-number="182"></td>
        <td id="LC182" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> pacing for discover bandwidth released by other tcp status.</span></td>
      </tr>
      <tr>
        <td id="L183" class="blob-num js-line-number" data-line-number="183"></td>
        <td id="LC183" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> increase it to discover more available bw.</span></td>
      </tr>
      <tr>
        <td id="L184" class="blob-num js-line-number" data-line-number="184"></td>
        <td id="LC184" class="blob-code blob-code-inner js-file-line">	BBR_UNIT * <span class="pl-c1">6</span> / <span class="pl-c1">4</span>,	<span class="pl-c"><span class="pl-c">/*</span> probe for more available bw <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L185" class="blob-num js-line-number" data-line-number="185"></td>
        <td id="LC185" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> need a drain when the queue is coming even heavy traffic conn.</span></td>
      </tr>
      <tr>
        <td id="L186" class="blob-num js-line-number" data-line-number="186"></td>
        <td id="LC186" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> the speeder set as 5/3, but the drainer set as 2/3(set it drain less). (all rate value is compare to 1)</span></td>
      </tr>
      <tr>
        <td id="L187" class="blob-num js-line-number" data-line-number="187"></td>
        <td id="LC187" class="blob-code blob-code-inner js-file-line">	BBR_UNIT * <span class="pl-c1">3</span> / <span class="pl-c1">4</span>,	<span class="pl-c"><span class="pl-c">/*</span> drain queue and/or yield bw to other flows <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L188" class="blob-num js-line-number" data-line-number="188"></td>
        <td id="LC188" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> the following 6 pacing rate value, are used to decide that:</span></td>
      </tr>
      <tr>
        <td id="L189" class="blob-num js-line-number" data-line-number="189"></td>
        <td id="LC189" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> those 6 phenemonons are all take [the max bw and the min rtt discovered in 10 bbr period] as rate and cwnd.</span></td>
      </tr>
      <tr>
        <td id="L190" class="blob-num js-line-number" data-line-number="190"></td>
        <td id="LC190" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> increase it to calculate bigger target value.</span></td>
      </tr>
      <tr>
        <td id="L191" class="blob-num js-line-number" data-line-number="191"></td>
        <td id="LC191" class="blob-code blob-code-inner js-file-line">	BBR_UNIT * <span class="pl-c1">5</span> / <span class="pl-c1">4</span>, BBR_UNIT * <span class="pl-c1">5</span> / <span class="pl-c1">4</span>, BBR_UNIT * <span class="pl-c1">5</span> / <span class="pl-c1">4</span>,	<span class="pl-c"><span class="pl-c">/*</span> cruise at 1.0*bw to utilize pipe, <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L192" class="blob-num js-line-number" data-line-number="192"></td>
        <td id="LC192" class="blob-code blob-code-inner js-file-line">	BBR_UNIT * <span class="pl-c1">6</span> / <span class="pl-c1">4</span>, BBR_UNIT * <span class="pl-c1">6</span> / <span class="pl-c1">4</span>, BBR_UNIT * <span class="pl-c1">6</span> / <span class="pl-c1">4</span>	<span class="pl-c"><span class="pl-c">/*</span> without creating excess queue... <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L193" class="blob-num js-line-number" data-line-number="193"></td>
        <td id="LC193" class="blob-code blob-code-inner js-file-line">};</td>
      </tr>
      <tr>
        <td id="L194" class="blob-num js-line-number" data-line-number="194"></td>
        <td id="LC194" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L195" class="blob-num js-line-number" data-line-number="195"></td>
        <td id="LC195" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Randomize the starting gain cycling phase over N phases: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L196" class="blob-num js-line-number" data-line-number="196"></td>
        <td id="LC196" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_cycle_rand = <span class="pl-c1">7</span>;</td>
      </tr>
      <tr>
        <td id="L197" class="blob-num js-line-number" data-line-number="197"></td>
        <td id="LC197" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L198" class="blob-num js-line-number" data-line-number="198"></td>
        <td id="LC198" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Try to keep at least this many packets in flight, if things go smoothly. For</span></td>
      </tr>
      <tr>
        <td id="L199" class="blob-num js-line-number" data-line-number="199"></td>
        <td id="LC199" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * smooth functioning, a sliding window protocol ACKing every other packet</span></td>
      </tr>
      <tr>
        <td id="L200" class="blob-num js-line-number" data-line-number="200"></td>
        <td id="LC200" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * needs at least 4 packets in flight:</span></td>
      </tr>
      <tr>
        <td id="L201" class="blob-num js-line-number" data-line-number="201"></td>
        <td id="LC201" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L202" class="blob-num js-line-number" data-line-number="202"></td>
        <td id="LC202" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> minimumly keeps 4 package when discover minimum rtt</span></td>
      </tr>
      <tr>
        <td id="L203" class="blob-num js-line-number" data-line-number="203"></td>
        <td id="LC203" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> use 1 package to discover minimum rtt is less effective.</span></td>
      </tr>
      <tr>
        <td id="L204" class="blob-num js-line-number" data-line-number="204"></td>
        <td id="LC204" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> use 5 package to discover minimum rtt is more effective, but may makes a heavy package queue.</span></td>
      </tr>
      <tr>
        <td id="L205" class="blob-num js-line-number" data-line-number="205"></td>
        <td id="LC205" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> use 4 package to discover minimum rtt is just good.</span></td>
      </tr>
      <tr>
        <td id="L206" class="blob-num js-line-number" data-line-number="206"></td>
        <td id="LC206" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_cwnd_min_target = <span class="pl-c1">4</span>;</td>
      </tr>
      <tr>
        <td id="L207" class="blob-num js-line-number" data-line-number="207"></td>
        <td id="LC207" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L208" class="blob-num js-line-number" data-line-number="208"></td>
        <td id="LC208" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> To estimate if BBR_STARTUP mode (i.e. high_gain) has filled pipe... <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L209" class="blob-num js-line-number" data-line-number="209"></td>
        <td id="LC209" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If bw has increased significantly (1.25x), there may be more bw available: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L210" class="blob-num js-line-number" data-line-number="210"></td>
        <td id="LC210" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_full_bw_thresh = BBR_UNIT * <span class="pl-c1">5</span> / <span class="pl-c1">4</span>;</td>
      </tr>
      <tr>
        <td id="L211" class="blob-num js-line-number" data-line-number="211"></td>
        <td id="LC211" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> But after 3 rounds w/o significant bw growth, estimate pipe is full: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L212" class="blob-num js-line-number" data-line-number="212"></td>
        <td id="LC212" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_full_bw_cnt = <span class="pl-c1">3</span>;</td>
      </tr>
      <tr>
        <td id="L213" class="blob-num js-line-number" data-line-number="213"></td>
        <td id="LC213" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L214" class="blob-num js-line-number" data-line-number="214"></td>
        <td id="LC214" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> &quot;long-term&quot; (&quot;LT&quot;) bandwidth estimator parameters... <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L215" class="blob-num js-line-number" data-line-number="215"></td>
        <td id="LC215" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> The minimum number of rounds in an LT bw sampling interval: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L216" class="blob-num js-line-number" data-line-number="216"></td>
        <td id="LC216" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_lt_intvl_min_rtts = <span class="pl-c1">4</span>;</td>
      </tr>
      <tr>
        <td id="L217" class="blob-num js-line-number" data-line-number="217"></td>
        <td id="LC217" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If lost/delivered ratio &gt; 20%, interval is &quot;lossy&quot; and we may be policed: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L218" class="blob-num js-line-number" data-line-number="218"></td>
        <td id="LC218" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_lt_loss_thresh = <span class="pl-c1">50</span>;</td>
      </tr>
      <tr>
        <td id="L219" class="blob-num js-line-number" data-line-number="219"></td>
        <td id="LC219" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If 2 intervals have a bw ratio &lt;= 1/8, their bw is &quot;consistent&quot;: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L220" class="blob-num js-line-number" data-line-number="220"></td>
        <td id="LC220" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> i set its minimum limit as [1/4] ratio</span></td>
      </tr>
      <tr>
        <td id="L221" class="blob-num js-line-number" data-line-number="221"></td>
        <td id="LC221" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_lt_bw_ratio = BBR_UNIT / <span class="pl-c1">4</span>;</td>
      </tr>
      <tr>
        <td id="L222" class="blob-num js-line-number" data-line-number="222"></td>
        <td id="LC222" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If 2 intervals have a bw diff &lt;= 4 Kbit/sec their bw is &quot;consistent&quot;: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L223" class="blob-num js-line-number" data-line-number="223"></td>
        <td id="LC223" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">//</span> according to the above &quot;bbr_lt_bw_ratio = BBR_UNIT / 4&quot;, i set this as [4000/4]</span></td>
      </tr>
      <tr>
        <td id="L224" class="blob-num js-line-number" data-line-number="224"></td>
        <td id="LC224" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_lt_bw_diff = <span class="pl-c1">4000</span> / <span class="pl-c1">4</span>;</td>
      </tr>
      <tr>
        <td id="L225" class="blob-num js-line-number" data-line-number="225"></td>
        <td id="LC225" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If we estimate we&#39;re policed, use lt_bw for this many round trips: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L226" class="blob-num js-line-number" data-line-number="226"></td>
        <td id="LC226" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">const</span> u32 bbr_lt_bw_max_rtts = <span class="pl-c1">48</span>;</td>
      </tr>
      <tr>
        <td id="L227" class="blob-num js-line-number" data-line-number="227"></td>
        <td id="LC227" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L228" class="blob-num js-line-number" data-line-number="228"></td>
        <td id="LC228" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Do we estimate that STARTUP filled the pipe? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L229" class="blob-num js-line-number" data-line-number="229"></td>
        <td id="LC229" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">bool</span> <span class="pl-en">bbr_full_bw_reached</span>(<span class="pl-k">const</span> <span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L230" class="blob-num js-line-number" data-line-number="230"></td>
        <td id="LC230" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L231" class="blob-num js-line-number" data-line-number="231"></td>
        <td id="LC231" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">const</span> <span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L232" class="blob-num js-line-number" data-line-number="232"></td>
        <td id="LC232" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L233" class="blob-num js-line-number" data-line-number="233"></td>
        <td id="LC233" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> bbr-&gt;full_bw_cnt &gt;= bbr_full_bw_cnt;</td>
      </tr>
      <tr>
        <td id="L234" class="blob-num js-line-number" data-line-number="234"></td>
        <td id="LC234" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L235" class="blob-num js-line-number" data-line-number="235"></td>
        <td id="LC235" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L236" class="blob-num js-line-number" data-line-number="236"></td>
        <td id="LC236" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Return the windowed max recent bandwidth sample, in pkts/uS &lt;&lt; BW_SCALE. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L237" class="blob-num js-line-number" data-line-number="237"></td>
        <td id="LC237" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_max_bw</span>(<span class="pl-k">const</span> <span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L238" class="blob-num js-line-number" data-line-number="238"></td>
        <td id="LC238" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L239" class="blob-num js-line-number" data-line-number="239"></td>
        <td id="LC239" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L240" class="blob-num js-line-number" data-line-number="240"></td>
        <td id="LC240" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L241" class="blob-num js-line-number" data-line-number="241"></td>
        <td id="LC241" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">minmax_get</span>(&amp;bbr-&gt;bw);</td>
      </tr>
      <tr>
        <td id="L242" class="blob-num js-line-number" data-line-number="242"></td>
        <td id="LC242" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L243" class="blob-num js-line-number" data-line-number="243"></td>
        <td id="LC243" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L244" class="blob-num js-line-number" data-line-number="244"></td>
        <td id="LC244" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Return the estimated bandwidth of the path, in pkts/uS &lt;&lt; BW_SCALE. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L245" class="blob-num js-line-number" data-line-number="245"></td>
        <td id="LC245" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_bw</span>(<span class="pl-k">const</span> <span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L246" class="blob-num js-line-number" data-line-number="246"></td>
        <td id="LC246" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L247" class="blob-num js-line-number" data-line-number="247"></td>
        <td id="LC247" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L248" class="blob-num js-line-number" data-line-number="248"></td>
        <td id="LC248" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L249" class="blob-num js-line-number" data-line-number="249"></td>
        <td id="LC249" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> bbr-&gt;lt_use_bw ? bbr-&gt;lt_bw : <span class="pl-c1">bbr_max_bw</span>(sk);</td>
      </tr>
      <tr>
        <td id="L250" class="blob-num js-line-number" data-line-number="250"></td>
        <td id="LC250" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L251" class="blob-num js-line-number" data-line-number="251"></td>
        <td id="LC251" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L252" class="blob-num js-line-number" data-line-number="252"></td>
        <td id="LC252" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Return rate in bytes per second, optionally with a gain.</span></td>
      </tr>
      <tr>
        <td id="L253" class="blob-num js-line-number" data-line-number="253"></td>
        <td id="LC253" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * The order here is chosen carefully to avoid overflow of u64. This should</span></td>
      </tr>
      <tr>
        <td id="L254" class="blob-num js-line-number" data-line-number="254"></td>
        <td id="LC254" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * work for input rates of up to 2.9Tbit/sec and gain of 2.89x.</span></td>
      </tr>
      <tr>
        <td id="L255" class="blob-num js-line-number" data-line-number="255"></td>
        <td id="LC255" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L256" class="blob-num js-line-number" data-line-number="256"></td>
        <td id="LC256" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u64 <span class="pl-en">bbr_rate_bytes_per_sec</span>(<span class="pl-k">struct</span> sock *sk, u64 rate, <span class="pl-k">int</span> gain)</td>
      </tr>
      <tr>
        <td id="L257" class="blob-num js-line-number" data-line-number="257"></td>
        <td id="LC257" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L258" class="blob-num js-line-number" data-line-number="258"></td>
        <td id="LC258" class="blob-code blob-code-inner js-file-line">	rate *= <span class="pl-c1">tcp_mss_to_mtu</span>(sk, <span class="pl-c1">tcp_sk</span>(sk)-&gt;mss_cache);</td>
      </tr>
      <tr>
        <td id="L259" class="blob-num js-line-number" data-line-number="259"></td>
        <td id="LC259" class="blob-code blob-code-inner js-file-line">	rate *= gain;</td>
      </tr>
      <tr>
        <td id="L260" class="blob-num js-line-number" data-line-number="260"></td>
        <td id="LC260" class="blob-code blob-code-inner js-file-line">	rate &gt;&gt;= BBR_SCALE;</td>
      </tr>
      <tr>
        <td id="L261" class="blob-num js-line-number" data-line-number="261"></td>
        <td id="LC261" class="blob-code blob-code-inner js-file-line">	rate *= USEC_PER_SEC;</td>
      </tr>
      <tr>
        <td id="L262" class="blob-num js-line-number" data-line-number="262"></td>
        <td id="LC262" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> rate &gt;&gt; BW_SCALE;</td>
      </tr>
      <tr>
        <td id="L263" class="blob-num js-line-number" data-line-number="263"></td>
        <td id="LC263" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L264" class="blob-num js-line-number" data-line-number="264"></td>
        <td id="LC264" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L265" class="blob-num js-line-number" data-line-number="265"></td>
        <td id="LC265" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Pace using current bw estimate and a gain factor. In order to help drive the</span></td>
      </tr>
      <tr>
        <td id="L266" class="blob-num js-line-number" data-line-number="266"></td>
        <td id="LC266" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * network toward lower queues while maintaining high utilization and low</span></td>
      </tr>
      <tr>
        <td id="L267" class="blob-num js-line-number" data-line-number="267"></td>
        <td id="LC267" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * latency, the average pacing rate aims to be slightly (~1%) lower than the</span></td>
      </tr>
      <tr>
        <td id="L268" class="blob-num js-line-number" data-line-number="268"></td>
        <td id="LC268" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * estimated bandwidth. This is an important aspect of the design. In this</span></td>
      </tr>
      <tr>
        <td id="L269" class="blob-num js-line-number" data-line-number="269"></td>
        <td id="LC269" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * implementation this slightly lower pacing rate is achieved implicitly by not</span></td>
      </tr>
      <tr>
        <td id="L270" class="blob-num js-line-number" data-line-number="270"></td>
        <td id="LC270" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * including link-layer headers in the packet size used for the pacing rate.</span></td>
      </tr>
      <tr>
        <td id="L271" class="blob-num js-line-number" data-line-number="271"></td>
        <td id="LC271" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L272" class="blob-num js-line-number" data-line-number="272"></td>
        <td id="LC272" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_set_pacing_rate</span>(<span class="pl-k">struct</span> sock *sk, u32 bw, <span class="pl-k">int</span> gain)</td>
      </tr>
      <tr>
        <td id="L273" class="blob-num js-line-number" data-line-number="273"></td>
        <td id="LC273" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L274" class="blob-num js-line-number" data-line-number="274"></td>
        <td id="LC274" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L275" class="blob-num js-line-number" data-line-number="275"></td>
        <td id="LC275" class="blob-code blob-code-inner js-file-line">	u64 rate = bw;</td>
      </tr>
      <tr>
        <td id="L276" class="blob-num js-line-number" data-line-number="276"></td>
        <td id="LC276" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L277" class="blob-num js-line-number" data-line-number="277"></td>
        <td id="LC277" class="blob-code blob-code-inner js-file-line">	rate = <span class="pl-c1">bbr_rate_bytes_per_sec</span>(sk, rate, gain);</td>
      </tr>
      <tr>
        <td id="L278" class="blob-num js-line-number" data-line-number="278"></td>
        <td id="LC278" class="blob-code blob-code-inner js-file-line">	rate = <span class="pl-c1">min_t</span>(u64, rate, sk-&gt;sk_max_pacing_rate);</td>
      </tr>
      <tr>
        <td id="L279" class="blob-num js-line-number" data-line-number="279"></td>
        <td id="LC279" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;mode != BBR_STARTUP || rate &gt; sk-&gt;sk_pacing_rate)</td>
      </tr>
      <tr>
        <td id="L280" class="blob-num js-line-number" data-line-number="280"></td>
        <td id="LC280" class="blob-code blob-code-inner js-file-line">		sk-&gt;sk_pacing_rate = rate;</td>
      </tr>
      <tr>
        <td id="L281" class="blob-num js-line-number" data-line-number="281"></td>
        <td id="LC281" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L282" class="blob-num js-line-number" data-line-number="282"></td>
        <td id="LC282" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L283" class="blob-num js-line-number" data-line-number="283"></td>
        <td id="LC283" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Return count of segments we want in the skbs we send, or 0 for default. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L284" class="blob-num js-line-number" data-line-number="284"></td>
        <td id="LC284" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_tso_segs_goal</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L285" class="blob-num js-line-number" data-line-number="285"></td>
        <td id="LC285" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L286" class="blob-num js-line-number" data-line-number="286"></td>
        <td id="LC286" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L287" class="blob-num js-line-number" data-line-number="287"></td>
        <td id="LC287" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L288" class="blob-num js-line-number" data-line-number="288"></td>
        <td id="LC288" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> bbr-&gt;tso_segs_goal;</td>
      </tr>
      <tr>
        <td id="L289" class="blob-num js-line-number" data-line-number="289"></td>
        <td id="LC289" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L290" class="blob-num js-line-number" data-line-number="290"></td>
        <td id="LC290" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L291" class="blob-num js-line-number" data-line-number="291"></td>
        <td id="LC291" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_set_tso_segs_goal</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L292" class="blob-num js-line-number" data-line-number="292"></td>
        <td id="LC292" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L293" class="blob-num js-line-number" data-line-number="293"></td>
        <td id="LC293" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L294" class="blob-num js-line-number" data-line-number="294"></td>
        <td id="LC294" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L295" class="blob-num js-line-number" data-line-number="295"></td>
        <td id="LC295" class="blob-code blob-code-inner js-file-line">	u32 min_segs;</td>
      </tr>
      <tr>
        <td id="L296" class="blob-num js-line-number" data-line-number="296"></td>
        <td id="LC296" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L297" class="blob-num js-line-number" data-line-number="297"></td>
        <td id="LC297" class="blob-code blob-code-inner js-file-line">	min_segs = sk-&gt;sk_pacing_rate &lt; (bbr_min_tso_rate &gt;&gt; <span class="pl-c1">3</span>) ? <span class="pl-c1">1</span> : <span class="pl-c1">2</span>;</td>
      </tr>
      <tr>
        <td id="L298" class="blob-num js-line-number" data-line-number="298"></td>
        <td id="LC298" class="blob-code blob-code-inner js-file-line">	bbr-&gt;tso_segs_goal = <span class="pl-c1">min</span>(<span class="pl-c1">tcp_tso_autosize</span>(sk, tp-&gt;mss_cache, min_segs),</td>
      </tr>
      <tr>
        <td id="L299" class="blob-num js-line-number" data-line-number="299"></td>
        <td id="LC299" class="blob-code blob-code-inner js-file-line">				 <span class="pl-c1">0x7FU</span>);</td>
      </tr>
      <tr>
        <td id="L300" class="blob-num js-line-number" data-line-number="300"></td>
        <td id="LC300" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L301" class="blob-num js-line-number" data-line-number="301"></td>
        <td id="LC301" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L302" class="blob-num js-line-number" data-line-number="302"></td>
        <td id="LC302" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Save &quot;last known good&quot; cwnd so we can restore it after losses or PROBE_RTT <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L303" class="blob-num js-line-number" data-line-number="303"></td>
        <td id="LC303" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_save_cwnd</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L304" class="blob-num js-line-number" data-line-number="304"></td>
        <td id="LC304" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L305" class="blob-num js-line-number" data-line-number="305"></td>
        <td id="LC305" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L306" class="blob-num js-line-number" data-line-number="306"></td>
        <td id="LC306" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L307" class="blob-num js-line-number" data-line-number="307"></td>
        <td id="LC307" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L308" class="blob-num js-line-number" data-line-number="308"></td>
        <td id="LC308" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;prev_ca_state &lt; TCP_CA_Recovery &amp;&amp; bbr-&gt;mode != BBR_PROBE_RTT)</td>
      </tr>
      <tr>
        <td id="L309" class="blob-num js-line-number" data-line-number="309"></td>
        <td id="LC309" class="blob-code blob-code-inner js-file-line">		bbr-&gt;prior_cwnd = tp-&gt;snd_cwnd;  <span class="pl-c"><span class="pl-c">/*</span> this cwnd is good enough <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L310" class="blob-num js-line-number" data-line-number="310"></td>
        <td id="LC310" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">else</span>  <span class="pl-c"><span class="pl-c">/*</span> loss recovery or BBR_PROBE_RTT have temporarily cut cwnd <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L311" class="blob-num js-line-number" data-line-number="311"></td>
        <td id="LC311" class="blob-code blob-code-inner js-file-line">		bbr-&gt;prior_cwnd = <span class="pl-c1">max</span>(bbr-&gt;prior_cwnd, tp-&gt;snd_cwnd);</td>
      </tr>
      <tr>
        <td id="L312" class="blob-num js-line-number" data-line-number="312"></td>
        <td id="LC312" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L313" class="blob-num js-line-number" data-line-number="313"></td>
        <td id="LC313" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L314" class="blob-num js-line-number" data-line-number="314"></td>
        <td id="LC314" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_cwnd_event</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">enum</span> tcp_ca_event event)</td>
      </tr>
      <tr>
        <td id="L315" class="blob-num js-line-number" data-line-number="315"></td>
        <td id="LC315" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L316" class="blob-num js-line-number" data-line-number="316"></td>
        <td id="LC316" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L317" class="blob-num js-line-number" data-line-number="317"></td>
        <td id="LC317" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L318" class="blob-num js-line-number" data-line-number="318"></td>
        <td id="LC318" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L319" class="blob-num js-line-number" data-line-number="319"></td>
        <td id="LC319" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (event == CA_EVENT_TX_START &amp;&amp; tp-&gt;app_limited) {</td>
      </tr>
      <tr>
        <td id="L320" class="blob-num js-line-number" data-line-number="320"></td>
        <td id="LC320" class="blob-code blob-code-inner js-file-line">		bbr-&gt;idle_restart = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L321" class="blob-num js-line-number" data-line-number="321"></td>
        <td id="LC321" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Avoid pointless buffer overflows: pace at est. bw if we don&#39;t</span></td>
      </tr>
      <tr>
        <td id="L322" class="blob-num js-line-number" data-line-number="322"></td>
        <td id="LC322" class="blob-code blob-code-inner js-file-line"><span class="pl-c">		 * need more speed (we&#39;re restarting from idle and app-limited).</span></td>
      </tr>
      <tr>
        <td id="L323" class="blob-num js-line-number" data-line-number="323"></td>
        <td id="LC323" class="blob-code blob-code-inner js-file-line"><span class="pl-c">		 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L324" class="blob-num js-line-number" data-line-number="324"></td>
        <td id="LC324" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">if</span> (bbr-&gt;mode == BBR_PROBE_BW)</td>
      </tr>
      <tr>
        <td id="L325" class="blob-num js-line-number" data-line-number="325"></td>
        <td id="LC325" class="blob-code blob-code-inner js-file-line">			<span class="pl-c1">bbr_set_pacing_rate</span>(sk, <span class="pl-c1">bbr_bw</span>(sk), BBR_UNIT);</td>
      </tr>
      <tr>
        <td id="L326" class="blob-num js-line-number" data-line-number="326"></td>
        <td id="LC326" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L327" class="blob-num js-line-number" data-line-number="327"></td>
        <td id="LC327" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L328" class="blob-num js-line-number" data-line-number="328"></td>
        <td id="LC328" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L329" class="blob-num js-line-number" data-line-number="329"></td>
        <td id="LC329" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Find target cwnd. Right-size the cwnd based on min RTT and the</span></td>
      </tr>
      <tr>
        <td id="L330" class="blob-num js-line-number" data-line-number="330"></td>
        <td id="LC330" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * estimated bottleneck bandwidth:</span></td>
      </tr>
      <tr>
        <td id="L331" class="blob-num js-line-number" data-line-number="331"></td>
        <td id="LC331" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L332" class="blob-num js-line-number" data-line-number="332"></td>
        <td id="LC332" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * cwnd = bw * min_rtt * gain = BDP * gain</span></td>
      </tr>
      <tr>
        <td id="L333" class="blob-num js-line-number" data-line-number="333"></td>
        <td id="LC333" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L334" class="blob-num js-line-number" data-line-number="334"></td>
        <td id="LC334" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * The key factor, gain, controls the amount of queue. While a small gain</span></td>
      </tr>
      <tr>
        <td id="L335" class="blob-num js-line-number" data-line-number="335"></td>
        <td id="LC335" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * builds a smaller queue, it becomes more vulnerable to noise in RTT</span></td>
      </tr>
      <tr>
        <td id="L336" class="blob-num js-line-number" data-line-number="336"></td>
        <td id="LC336" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * measurements (e.g., delayed ACKs or other ACK compression effects). This</span></td>
      </tr>
      <tr>
        <td id="L337" class="blob-num js-line-number" data-line-number="337"></td>
        <td id="LC337" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * noise may cause BBR to under-estimate the rate.</span></td>
      </tr>
      <tr>
        <td id="L338" class="blob-num js-line-number" data-line-number="338"></td>
        <td id="LC338" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L339" class="blob-num js-line-number" data-line-number="339"></td>
        <td id="LC339" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * To achieve full performance in high-speed paths, we budget enough cwnd to</span></td>
      </tr>
      <tr>
        <td id="L340" class="blob-num js-line-number" data-line-number="340"></td>
        <td id="LC340" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * fit full-sized skbs in-flight on both end hosts to fully utilize the path:</span></td>
      </tr>
      <tr>
        <td id="L341" class="blob-num js-line-number" data-line-number="341"></td>
        <td id="LC341" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   - one skb in sending host Qdisc,</span></td>
      </tr>
      <tr>
        <td id="L342" class="blob-num js-line-number" data-line-number="342"></td>
        <td id="LC342" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   - one skb in sending host TSO/GSO engine</span></td>
      </tr>
      <tr>
        <td id="L343" class="blob-num js-line-number" data-line-number="343"></td>
        <td id="LC343" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *   - one skb being received by receiver host LRO/GRO/delayed-ACK engine</span></td>
      </tr>
      <tr>
        <td id="L344" class="blob-num js-line-number" data-line-number="344"></td>
        <td id="LC344" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Don&#39;t worry, at low rates (bbr_min_tso_rate) this won&#39;t bloat cwnd because</span></td>
      </tr>
      <tr>
        <td id="L345" class="blob-num js-line-number" data-line-number="345"></td>
        <td id="LC345" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * in such cases tso_segs_goal is 1. The minimum cwnd is 4 packets,</span></td>
      </tr>
      <tr>
        <td id="L346" class="blob-num js-line-number" data-line-number="346"></td>
        <td id="LC346" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * which allows 2 outstanding 2-packet sequences, to try to keep pipe</span></td>
      </tr>
      <tr>
        <td id="L347" class="blob-num js-line-number" data-line-number="347"></td>
        <td id="LC347" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * full even with ACK-every-other-packet delayed ACKs.</span></td>
      </tr>
      <tr>
        <td id="L348" class="blob-num js-line-number" data-line-number="348"></td>
        <td id="LC348" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L349" class="blob-num js-line-number" data-line-number="349"></td>
        <td id="LC349" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_target_cwnd</span>(<span class="pl-k">struct</span> sock *sk, u32 bw, <span class="pl-k">int</span> gain)</td>
      </tr>
      <tr>
        <td id="L350" class="blob-num js-line-number" data-line-number="350"></td>
        <td id="LC350" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L351" class="blob-num js-line-number" data-line-number="351"></td>
        <td id="LC351" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L352" class="blob-num js-line-number" data-line-number="352"></td>
        <td id="LC352" class="blob-code blob-code-inner js-file-line">	u32 cwnd;</td>
      </tr>
      <tr>
        <td id="L353" class="blob-num js-line-number" data-line-number="353"></td>
        <td id="LC353" class="blob-code blob-code-inner js-file-line">	u64 w;</td>
      </tr>
      <tr>
        <td id="L354" class="blob-num js-line-number" data-line-number="354"></td>
        <td id="LC354" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L355" class="blob-num js-line-number" data-line-number="355"></td>
        <td id="LC355" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> If we&#39;ve never had a valid RTT sample, cap cwnd at the initial</span></td>
      </tr>
      <tr>
        <td id="L356" class="blob-num js-line-number" data-line-number="356"></td>
        <td id="LC356" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * default. This should only happen when the connection is not using TCP</span></td>
      </tr>
      <tr>
        <td id="L357" class="blob-num js-line-number" data-line-number="357"></td>
        <td id="LC357" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * timestamps and has retransmitted all of the SYN/SYNACK/data packets</span></td>
      </tr>
      <tr>
        <td id="L358" class="blob-num js-line-number" data-line-number="358"></td>
        <td id="LC358" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * ACKed so far. In this case, an RTO can cut cwnd to 1, in which</span></td>
      </tr>
      <tr>
        <td id="L359" class="blob-num js-line-number" data-line-number="359"></td>
        <td id="LC359" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * case we need to slow-start up toward something safe: TCP_INIT_CWND.</span></td>
      </tr>
      <tr>
        <td id="L360" class="blob-num js-line-number" data-line-number="360"></td>
        <td id="LC360" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L361" class="blob-num js-line-number" data-line-number="361"></td>
        <td id="LC361" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (<span class="pl-c1">unlikely</span>(bbr-&gt;min_rtt_us == ~<span class="pl-c1">0U</span>))	 <span class="pl-c"><span class="pl-c">/*</span> no valid RTT samples yet? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L362" class="blob-num js-line-number" data-line-number="362"></td>
        <td id="LC362" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span> TCP_INIT_CWND;  <span class="pl-c"><span class="pl-c">/*</span> be safe: cap at default initial cwnd<span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L363" class="blob-num js-line-number" data-line-number="363"></td>
        <td id="LC363" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L364" class="blob-num js-line-number" data-line-number="364"></td>
        <td id="LC364" class="blob-code blob-code-inner js-file-line">	w = (u64)bw * bbr-&gt;min_rtt_us;</td>
      </tr>
      <tr>
        <td id="L365" class="blob-num js-line-number" data-line-number="365"></td>
        <td id="LC365" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L366" class="blob-num js-line-number" data-line-number="366"></td>
        <td id="LC366" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Apply a gain to the given value, then remove the BW_SCALE shift. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L367" class="blob-num js-line-number" data-line-number="367"></td>
        <td id="LC367" class="blob-code blob-code-inner js-file-line">	cwnd = (((w * gain) &gt;&gt; BBR_SCALE) + BW_UNIT - <span class="pl-c1">1</span>) / BW_UNIT;</td>
      </tr>
      <tr>
        <td id="L368" class="blob-num js-line-number" data-line-number="368"></td>
        <td id="LC368" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L369" class="blob-num js-line-number" data-line-number="369"></td>
        <td id="LC369" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Allow enough full-sized skbs in flight to utilize end systems. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L370" class="blob-num js-line-number" data-line-number="370"></td>
        <td id="LC370" class="blob-code blob-code-inner js-file-line">	cwnd += <span class="pl-c1">3</span> * bbr-&gt;tso_segs_goal;</td>
      </tr>
      <tr>
        <td id="L371" class="blob-num js-line-number" data-line-number="371"></td>
        <td id="LC371" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L372" class="blob-num js-line-number" data-line-number="372"></td>
        <td id="LC372" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Reduce delayed ACKs by rounding up cwnd to the next even number. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L373" class="blob-num js-line-number" data-line-number="373"></td>
        <td id="LC373" class="blob-code blob-code-inner js-file-line">	cwnd = (cwnd + <span class="pl-c1">1</span>) &amp; ~<span class="pl-c1">1U</span>;</td>
      </tr>
      <tr>
        <td id="L374" class="blob-num js-line-number" data-line-number="374"></td>
        <td id="LC374" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L375" class="blob-num js-line-number" data-line-number="375"></td>
        <td id="LC375" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> cwnd;</td>
      </tr>
      <tr>
        <td id="L376" class="blob-num js-line-number" data-line-number="376"></td>
        <td id="LC376" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L377" class="blob-num js-line-number" data-line-number="377"></td>
        <td id="LC377" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L378" class="blob-num js-line-number" data-line-number="378"></td>
        <td id="LC378" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> An optimization in BBR to reduce losses: On the first round of recovery, we</span></td>
      </tr>
      <tr>
        <td id="L379" class="blob-num js-line-number" data-line-number="379"></td>
        <td id="LC379" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * follow the packet conservation principle: send P packets per P packets acked.</span></td>
      </tr>
      <tr>
        <td id="L380" class="blob-num js-line-number" data-line-number="380"></td>
        <td id="LC380" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * After that, we slow-start and send at most 2*P packets per P packets acked.</span></td>
      </tr>
      <tr>
        <td id="L381" class="blob-num js-line-number" data-line-number="381"></td>
        <td id="LC381" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * After recovery finishes, or upon undo, we restore the cwnd we had when</span></td>
      </tr>
      <tr>
        <td id="L382" class="blob-num js-line-number" data-line-number="382"></td>
        <td id="LC382" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * recovery started (capped by the target cwnd based on estimated BDP).</span></td>
      </tr>
      <tr>
        <td id="L383" class="blob-num js-line-number" data-line-number="383"></td>
        <td id="LC383" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L384" class="blob-num js-line-number" data-line-number="384"></td>
        <td id="LC384" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * TODO(ycheng/ncardwell): implement a rate-based approach.</span></td>
      </tr>
      <tr>
        <td id="L385" class="blob-num js-line-number" data-line-number="385"></td>
        <td id="LC385" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L386" class="blob-num js-line-number" data-line-number="386"></td>
        <td id="LC386" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">bool</span> <span class="pl-en">bbr_set_cwnd_to_recover_or_restore</span>(</td>
      </tr>
      <tr>
        <td id="L387" class="blob-num js-line-number" data-line-number="387"></td>
        <td id="LC387" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs, u32 acked, u32 *new_cwnd)</td>
      </tr>
      <tr>
        <td id="L388" class="blob-num js-line-number" data-line-number="388"></td>
        <td id="LC388" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L389" class="blob-num js-line-number" data-line-number="389"></td>
        <td id="LC389" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L390" class="blob-num js-line-number" data-line-number="390"></td>
        <td id="LC390" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L391" class="blob-num js-line-number" data-line-number="391"></td>
        <td id="LC391" class="blob-code blob-code-inner js-file-line">	u8 prev_state = bbr-&gt;prev_ca_state, state = <span class="pl-c1">inet_csk</span>(sk)-&gt;icsk_ca_state;</td>
      </tr>
      <tr>
        <td id="L392" class="blob-num js-line-number" data-line-number="392"></td>
        <td id="LC392" class="blob-code blob-code-inner js-file-line">	u32 cwnd = tp-&gt;snd_cwnd;</td>
      </tr>
      <tr>
        <td id="L393" class="blob-num js-line-number" data-line-number="393"></td>
        <td id="LC393" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L394" class="blob-num js-line-number" data-line-number="394"></td>
        <td id="LC394" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> An ACK for P pkts should release at most 2*P packets. We do this</span></td>
      </tr>
      <tr>
        <td id="L395" class="blob-num js-line-number" data-line-number="395"></td>
        <td id="LC395" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * in two steps. First, here we deduct the number of lost packets.</span></td>
      </tr>
      <tr>
        <td id="L396" class="blob-num js-line-number" data-line-number="396"></td>
        <td id="LC396" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * Then, in bbr_set_cwnd() we slow start up toward the target cwnd.</span></td>
      </tr>
      <tr>
        <td id="L397" class="blob-num js-line-number" data-line-number="397"></td>
        <td id="LC397" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L398" class="blob-num js-line-number" data-line-number="398"></td>
        <td id="LC398" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (rs-&gt;losses &gt; <span class="pl-c1">0</span>)</td>
      </tr>
      <tr>
        <td id="L399" class="blob-num js-line-number" data-line-number="399"></td>
        <td id="LC399" class="blob-code blob-code-inner js-file-line">		cwnd = <span class="pl-c1">max_t</span>(s32, cwnd - rs-&gt;losses, <span class="pl-c1">1</span>);</td>
      </tr>
      <tr>
        <td id="L400" class="blob-num js-line-number" data-line-number="400"></td>
        <td id="LC400" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L401" class="blob-num js-line-number" data-line-number="401"></td>
        <td id="LC401" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (state == TCP_CA_Recovery &amp;&amp; prev_state != TCP_CA_Recovery) {</td>
      </tr>
      <tr>
        <td id="L402" class="blob-num js-line-number" data-line-number="402"></td>
        <td id="LC402" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Starting 1st round of Recovery, so do packet conservation. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L403" class="blob-num js-line-number" data-line-number="403"></td>
        <td id="LC403" class="blob-code blob-code-inner js-file-line">		bbr-&gt;packet_conservation = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L404" class="blob-num js-line-number" data-line-number="404"></td>
        <td id="LC404" class="blob-code blob-code-inner js-file-line">		bbr-&gt;next_rtt_delivered = tp-&gt;delivered;  <span class="pl-c"><span class="pl-c">/*</span> start round now <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L405" class="blob-num js-line-number" data-line-number="405"></td>
        <td id="LC405" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Cut unused cwnd from app behavior, TSQ, or TSO deferral: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L406" class="blob-num js-line-number" data-line-number="406"></td>
        <td id="LC406" class="blob-code blob-code-inner js-file-line">		cwnd = <span class="pl-c1">tcp_packets_in_flight</span>(tp) + acked;</td>
      </tr>
      <tr>
        <td id="L407" class="blob-num js-line-number" data-line-number="407"></td>
        <td id="LC407" class="blob-code blob-code-inner js-file-line">	} <span class="pl-k">else</span> <span class="pl-k">if</span> (prev_state &gt;= TCP_CA_Recovery &amp;&amp; state &lt; TCP_CA_Recovery) {</td>
      </tr>
      <tr>
        <td id="L408" class="blob-num js-line-number" data-line-number="408"></td>
        <td id="LC408" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Exiting loss recovery; restore cwnd saved before recovery. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L409" class="blob-num js-line-number" data-line-number="409"></td>
        <td id="LC409" class="blob-code blob-code-inner js-file-line">		bbr-&gt;restore_cwnd = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L410" class="blob-num js-line-number" data-line-number="410"></td>
        <td id="LC410" class="blob-code blob-code-inner js-file-line">		bbr-&gt;packet_conservation = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L411" class="blob-num js-line-number" data-line-number="411"></td>
        <td id="LC411" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L412" class="blob-num js-line-number" data-line-number="412"></td>
        <td id="LC412" class="blob-code blob-code-inner js-file-line">	bbr-&gt;prev_ca_state = state;</td>
      </tr>
      <tr>
        <td id="L413" class="blob-num js-line-number" data-line-number="413"></td>
        <td id="LC413" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L414" class="blob-num js-line-number" data-line-number="414"></td>
        <td id="LC414" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;restore_cwnd) {</td>
      </tr>
      <tr>
        <td id="L415" class="blob-num js-line-number" data-line-number="415"></td>
        <td id="LC415" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Restore cwnd after exiting loss recovery or PROBE_RTT. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L416" class="blob-num js-line-number" data-line-number="416"></td>
        <td id="LC416" class="blob-code blob-code-inner js-file-line">		cwnd = <span class="pl-c1">max</span>(cwnd, bbr-&gt;prior_cwnd);</td>
      </tr>
      <tr>
        <td id="L417" class="blob-num js-line-number" data-line-number="417"></td>
        <td id="LC417" class="blob-code blob-code-inner js-file-line">		bbr-&gt;restore_cwnd = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L418" class="blob-num js-line-number" data-line-number="418"></td>
        <td id="LC418" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L419" class="blob-num js-line-number" data-line-number="419"></td>
        <td id="LC419" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L420" class="blob-num js-line-number" data-line-number="420"></td>
        <td id="LC420" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;packet_conservation) {</td>
      </tr>
      <tr>
        <td id="L421" class="blob-num js-line-number" data-line-number="421"></td>
        <td id="LC421" class="blob-code blob-code-inner js-file-line">		*new_cwnd = <span class="pl-c1">max</span>(cwnd, <span class="pl-c1">tcp_packets_in_flight</span>(tp) + acked);</td>
      </tr>
      <tr>
        <td id="L422" class="blob-num js-line-number" data-line-number="422"></td>
        <td id="LC422" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span> <span class="pl-c1">true</span>;	<span class="pl-c"><span class="pl-c">/*</span> yes, using packet conservation <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L423" class="blob-num js-line-number" data-line-number="423"></td>
        <td id="LC423" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L424" class="blob-num js-line-number" data-line-number="424"></td>
        <td id="LC424" class="blob-code blob-code-inner js-file-line">	*new_cwnd = cwnd;</td>
      </tr>
      <tr>
        <td id="L425" class="blob-num js-line-number" data-line-number="425"></td>
        <td id="LC425" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">false</span>;</td>
      </tr>
      <tr>
        <td id="L426" class="blob-num js-line-number" data-line-number="426"></td>
        <td id="LC426" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L427" class="blob-num js-line-number" data-line-number="427"></td>
        <td id="LC427" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L428" class="blob-num js-line-number" data-line-number="428"></td>
        <td id="LC428" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Slow-start up toward target cwnd (if bw estimate is growing, or packet loss</span></td>
      </tr>
      <tr>
        <td id="L429" class="blob-num js-line-number" data-line-number="429"></td>
        <td id="LC429" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * has drawn us down below target), or snap down to target if we&#39;re above it.</span></td>
      </tr>
      <tr>
        <td id="L430" class="blob-num js-line-number" data-line-number="430"></td>
        <td id="LC430" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L431" class="blob-num js-line-number" data-line-number="431"></td>
        <td id="LC431" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_set_cwnd</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs,</td>
      </tr>
      <tr>
        <td id="L432" class="blob-num js-line-number" data-line-number="432"></td>
        <td id="LC432" class="blob-code blob-code-inner js-file-line">			 u32 acked, u32 bw, <span class="pl-k">int</span> gain)</td>
      </tr>
      <tr>
        <td id="L433" class="blob-num js-line-number" data-line-number="433"></td>
        <td id="LC433" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L434" class="blob-num js-line-number" data-line-number="434"></td>
        <td id="LC434" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L435" class="blob-num js-line-number" data-line-number="435"></td>
        <td id="LC435" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L436" class="blob-num js-line-number" data-line-number="436"></td>
        <td id="LC436" class="blob-code blob-code-inner js-file-line">	u32 cwnd = <span class="pl-c1">0</span>, target_cwnd = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L437" class="blob-num js-line-number" data-line-number="437"></td>
        <td id="LC437" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L438" class="blob-num js-line-number" data-line-number="438"></td>
        <td id="LC438" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!acked)</td>
      </tr>
      <tr>
        <td id="L439" class="blob-num js-line-number" data-line-number="439"></td>
        <td id="LC439" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L440" class="blob-num js-line-number" data-line-number="440"></td>
        <td id="LC440" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L441" class="blob-num js-line-number" data-line-number="441"></td>
        <td id="LC441" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (<span class="pl-c1">bbr_set_cwnd_to_recover_or_restore</span>(sk, rs, acked, &amp;cwnd))</td>
      </tr>
      <tr>
        <td id="L442" class="blob-num js-line-number" data-line-number="442"></td>
        <td id="LC442" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">goto</span> done;</td>
      </tr>
      <tr>
        <td id="L443" class="blob-num js-line-number" data-line-number="443"></td>
        <td id="LC443" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L444" class="blob-num js-line-number" data-line-number="444"></td>
        <td id="LC444" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> If we&#39;re below target cwnd, slow start cwnd toward target cwnd. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L445" class="blob-num js-line-number" data-line-number="445"></td>
        <td id="LC445" class="blob-code blob-code-inner js-file-line">	target_cwnd = <span class="pl-c1">bbr_target_cwnd</span>(sk, bw, gain);</td>
      </tr>
      <tr>
        <td id="L446" class="blob-num js-line-number" data-line-number="446"></td>
        <td id="LC446" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (<span class="pl-c1">bbr_full_bw_reached</span>(sk))  <span class="pl-c"><span class="pl-c">/*</span> only cut cwnd if we filled the pipe <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L447" class="blob-num js-line-number" data-line-number="447"></td>
        <td id="LC447" class="blob-code blob-code-inner js-file-line">		cwnd = <span class="pl-c1">min</span>(cwnd + acked, target_cwnd);</td>
      </tr>
      <tr>
        <td id="L448" class="blob-num js-line-number" data-line-number="448"></td>
        <td id="LC448" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">else</span> <span class="pl-k">if</span> (cwnd &lt; target_cwnd || tp-&gt;delivered &lt; TCP_INIT_CWND)</td>
      </tr>
      <tr>
        <td id="L449" class="blob-num js-line-number" data-line-number="449"></td>
        <td id="LC449" class="blob-code blob-code-inner js-file-line">		cwnd = cwnd + acked;</td>
      </tr>
      <tr>
        <td id="L450" class="blob-num js-line-number" data-line-number="450"></td>
        <td id="LC450" class="blob-code blob-code-inner js-file-line">	cwnd = <span class="pl-c1">max</span>(cwnd, bbr_cwnd_min_target);</td>
      </tr>
      <tr>
        <td id="L451" class="blob-num js-line-number" data-line-number="451"></td>
        <td id="LC451" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L452" class="blob-num js-line-number" data-line-number="452"></td>
        <td id="LC452" class="blob-code blob-code-inner js-file-line">done:</td>
      </tr>
      <tr>
        <td id="L453" class="blob-num js-line-number" data-line-number="453"></td>
        <td id="LC453" class="blob-code blob-code-inner js-file-line">	tp-&gt;snd_cwnd = <span class="pl-c1">min</span>(cwnd, tp-&gt;snd_cwnd_clamp);	<span class="pl-c"><span class="pl-c">/*</span> apply global cap <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L454" class="blob-num js-line-number" data-line-number="454"></td>
        <td id="LC454" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;mode == BBR_PROBE_RTT)  <span class="pl-c"><span class="pl-c">/*</span> drain queue, refresh min_rtt <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L455" class="blob-num js-line-number" data-line-number="455"></td>
        <td id="LC455" class="blob-code blob-code-inner js-file-line">		tp-&gt;snd_cwnd = <span class="pl-c1">max</span>(tp-&gt;snd_cwnd &gt;&gt; <span class="pl-c1">1</span>, bbr_cwnd_min_target);</td>
      </tr>
      <tr>
        <td id="L456" class="blob-num js-line-number" data-line-number="456"></td>
        <td id="LC456" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L457" class="blob-num js-line-number" data-line-number="457"></td>
        <td id="LC457" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L458" class="blob-num js-line-number" data-line-number="458"></td>
        <td id="LC458" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> End cycle phase if it&#39;s time and/or we hit the phase&#39;s in-flight target. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L459" class="blob-num js-line-number" data-line-number="459"></td>
        <td id="LC459" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">bool</span> <span class="pl-en">bbr_is_next_cycle_phase</span>(<span class="pl-k">struct</span> sock *sk,</td>
      </tr>
      <tr>
        <td id="L460" class="blob-num js-line-number" data-line-number="460"></td>
        <td id="LC460" class="blob-code blob-code-inner js-file-line">				    <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L461" class="blob-num js-line-number" data-line-number="461"></td>
        <td id="LC461" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L462" class="blob-num js-line-number" data-line-number="462"></td>
        <td id="LC462" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L463" class="blob-num js-line-number" data-line-number="463"></td>
        <td id="LC463" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L464" class="blob-num js-line-number" data-line-number="464"></td>
        <td id="LC464" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">bool</span> is_full_length =</td>
      </tr>
      <tr>
        <td id="L465" class="blob-num js-line-number" data-line-number="465"></td>
        <td id="LC465" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">skb_mstamp_us_delta</span>(&amp;tp-&gt;delivered_mstamp, &amp;bbr-&gt;cycle_mstamp) &gt;</td>
      </tr>
      <tr>
        <td id="L466" class="blob-num js-line-number" data-line-number="466"></td>
        <td id="LC466" class="blob-code blob-code-inner js-file-line">		bbr-&gt;min_rtt_us;</td>
      </tr>
      <tr>
        <td id="L467" class="blob-num js-line-number" data-line-number="467"></td>
        <td id="LC467" class="blob-code blob-code-inner js-file-line">	u32 inflight, bw;</td>
      </tr>
      <tr>
        <td id="L468" class="blob-num js-line-number" data-line-number="468"></td>
        <td id="LC468" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L469" class="blob-num js-line-number" data-line-number="469"></td>
        <td id="LC469" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> The pacing_gain of 1.0 paces at the estimated bw to try to fully</span></td>
      </tr>
      <tr>
        <td id="L470" class="blob-num js-line-number" data-line-number="470"></td>
        <td id="LC470" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * use the pipe without increasing the queue.</span></td>
      </tr>
      <tr>
        <td id="L471" class="blob-num js-line-number" data-line-number="471"></td>
        <td id="LC471" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L472" class="blob-num js-line-number" data-line-number="472"></td>
        <td id="LC472" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;pacing_gain == BBR_UNIT)</td>
      </tr>
      <tr>
        <td id="L473" class="blob-num js-line-number" data-line-number="473"></td>
        <td id="LC473" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span> is_full_length;		<span class="pl-c"><span class="pl-c">/*</span> just use wall clock time <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L474" class="blob-num js-line-number" data-line-number="474"></td>
        <td id="LC474" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L475" class="blob-num js-line-number" data-line-number="475"></td>
        <td id="LC475" class="blob-code blob-code-inner js-file-line">	inflight = rs-&gt;prior_in_flight;  <span class="pl-c"><span class="pl-c">/*</span> what was in-flight before ACK? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L476" class="blob-num js-line-number" data-line-number="476"></td>
        <td id="LC476" class="blob-code blob-code-inner js-file-line">	bw = <span class="pl-c1">bbr_max_bw</span>(sk);</td>
      </tr>
      <tr>
        <td id="L477" class="blob-num js-line-number" data-line-number="477"></td>
        <td id="LC477" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L478" class="blob-num js-line-number" data-line-number="478"></td>
        <td id="LC478" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> A pacing_gain &gt; 1.0 probes for bw by trying to raise inflight to at</span></td>
      </tr>
      <tr>
        <td id="L479" class="blob-num js-line-number" data-line-number="479"></td>
        <td id="LC479" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * least pacing_gain*BDP; this may take more than min_rtt if min_rtt is</span></td>
      </tr>
      <tr>
        <td id="L480" class="blob-num js-line-number" data-line-number="480"></td>
        <td id="LC480" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * small (e.g. on a LAN). We do not persist if packets are lost, since</span></td>
      </tr>
      <tr>
        <td id="L481" class="blob-num js-line-number" data-line-number="481"></td>
        <td id="LC481" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * a path with small buffers may not hold that much.</span></td>
      </tr>
      <tr>
        <td id="L482" class="blob-num js-line-number" data-line-number="482"></td>
        <td id="LC482" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L483" class="blob-num js-line-number" data-line-number="483"></td>
        <td id="LC483" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;pacing_gain &gt; BBR_UNIT)</td>
      </tr>
      <tr>
        <td id="L484" class="blob-num js-line-number" data-line-number="484"></td>
        <td id="LC484" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span> is_full_length &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L485" class="blob-num js-line-number" data-line-number="485"></td>
        <td id="LC485" class="blob-code blob-code-inner js-file-line">			(rs-&gt;losses ||  <span class="pl-c"><span class="pl-c">/*</span> perhaps pacing_gain*BDP won&#39;t fit <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L486" class="blob-num js-line-number" data-line-number="486"></td>
        <td id="LC486" class="blob-code blob-code-inner js-file-line">			 inflight &gt;= <span class="pl-c1">bbr_target_cwnd</span>(sk, bw, bbr-&gt;pacing_gain));</td>
      </tr>
      <tr>
        <td id="L487" class="blob-num js-line-number" data-line-number="487"></td>
        <td id="LC487" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L488" class="blob-num js-line-number" data-line-number="488"></td>
        <td id="LC488" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> A pacing_gain &lt; 1.0 tries to drain extra queue we added if bw</span></td>
      </tr>
      <tr>
        <td id="L489" class="blob-num js-line-number" data-line-number="489"></td>
        <td id="LC489" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * probing didn&#39;t find more bw. If inflight falls to match BDP then we</span></td>
      </tr>
      <tr>
        <td id="L490" class="blob-num js-line-number" data-line-number="490"></td>
        <td id="LC490" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * estimate queue is drained; persisting would underutilize the pipe.</span></td>
      </tr>
      <tr>
        <td id="L491" class="blob-num js-line-number" data-line-number="491"></td>
        <td id="LC491" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L492" class="blob-num js-line-number" data-line-number="492"></td>
        <td id="LC492" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> is_full_length ||</td>
      </tr>
      <tr>
        <td id="L493" class="blob-num js-line-number" data-line-number="493"></td>
        <td id="LC493" class="blob-code blob-code-inner js-file-line">		inflight &lt;= <span class="pl-c1">bbr_target_cwnd</span>(sk, bw, BBR_UNIT);</td>
      </tr>
      <tr>
        <td id="L494" class="blob-num js-line-number" data-line-number="494"></td>
        <td id="LC494" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L495" class="blob-num js-line-number" data-line-number="495"></td>
        <td id="LC495" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L496" class="blob-num js-line-number" data-line-number="496"></td>
        <td id="LC496" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_advance_cycle_phase</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L497" class="blob-num js-line-number" data-line-number="497"></td>
        <td id="LC497" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L498" class="blob-num js-line-number" data-line-number="498"></td>
        <td id="LC498" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L499" class="blob-num js-line-number" data-line-number="499"></td>
        <td id="LC499" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L500" class="blob-num js-line-number" data-line-number="500"></td>
        <td id="LC500" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L501" class="blob-num js-line-number" data-line-number="501"></td>
        <td id="LC501" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cycle_idx = (bbr-&gt;cycle_idx + <span class="pl-c1">1</span>) &amp; (CYCLE_LEN - <span class="pl-c1">1</span>);</td>
      </tr>
      <tr>
        <td id="L502" class="blob-num js-line-number" data-line-number="502"></td>
        <td id="LC502" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cycle_mstamp = tp-&gt;delivered_mstamp;</td>
      </tr>
      <tr>
        <td id="L503" class="blob-num js-line-number" data-line-number="503"></td>
        <td id="LC503" class="blob-code blob-code-inner js-file-line">	bbr-&gt;pacing_gain = bbr_pacing_gain[bbr-&gt;cycle_idx];</td>
      </tr>
      <tr>
        <td id="L504" class="blob-num js-line-number" data-line-number="504"></td>
        <td id="LC504" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L505" class="blob-num js-line-number" data-line-number="505"></td>
        <td id="LC505" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L506" class="blob-num js-line-number" data-line-number="506"></td>
        <td id="LC506" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Gain cycling: cycle pacing gain to converge to fair share of available bw. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L507" class="blob-num js-line-number" data-line-number="507"></td>
        <td id="LC507" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_update_cycle_phase</span>(<span class="pl-k">struct</span> sock *sk,</td>
      </tr>
      <tr>
        <td id="L508" class="blob-num js-line-number" data-line-number="508"></td>
        <td id="LC508" class="blob-code blob-code-inner js-file-line">				   <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L509" class="blob-num js-line-number" data-line-number="509"></td>
        <td id="LC509" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L510" class="blob-num js-line-number" data-line-number="510"></td>
        <td id="LC510" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L511" class="blob-num js-line-number" data-line-number="511"></td>
        <td id="LC511" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L512" class="blob-num js-line-number" data-line-number="512"></td>
        <td id="LC512" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> ((bbr-&gt;mode == BBR_PROBE_BW) &amp;&amp; !bbr-&gt;lt_use_bw &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L513" class="blob-num js-line-number" data-line-number="513"></td>
        <td id="LC513" class="blob-code blob-code-inner js-file-line">	    <span class="pl-c1">bbr_is_next_cycle_phase</span>(sk, rs))</td>
      </tr>
      <tr>
        <td id="L514" class="blob-num js-line-number" data-line-number="514"></td>
        <td id="LC514" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_advance_cycle_phase</span>(sk);</td>
      </tr>
      <tr>
        <td id="L515" class="blob-num js-line-number" data-line-number="515"></td>
        <td id="LC515" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L516" class="blob-num js-line-number" data-line-number="516"></td>
        <td id="LC516" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L517" class="blob-num js-line-number" data-line-number="517"></td>
        <td id="LC517" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_reset_startup_mode</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L518" class="blob-num js-line-number" data-line-number="518"></td>
        <td id="LC518" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L519" class="blob-num js-line-number" data-line-number="519"></td>
        <td id="LC519" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L520" class="blob-num js-line-number" data-line-number="520"></td>
        <td id="LC520" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L521" class="blob-num js-line-number" data-line-number="521"></td>
        <td id="LC521" class="blob-code blob-code-inner js-file-line">	bbr-&gt;mode = BBR_STARTUP;</td>
      </tr>
      <tr>
        <td id="L522" class="blob-num js-line-number" data-line-number="522"></td>
        <td id="LC522" class="blob-code blob-code-inner js-file-line">	bbr-&gt;pacing_gain = bbr_high_gain;</td>
      </tr>
      <tr>
        <td id="L523" class="blob-num js-line-number" data-line-number="523"></td>
        <td id="LC523" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cwnd_gain	 = bbr_high_gain;</td>
      </tr>
      <tr>
        <td id="L524" class="blob-num js-line-number" data-line-number="524"></td>
        <td id="LC524" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L525" class="blob-num js-line-number" data-line-number="525"></td>
        <td id="LC525" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L526" class="blob-num js-line-number" data-line-number="526"></td>
        <td id="LC526" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_reset_probe_bw_mode</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L527" class="blob-num js-line-number" data-line-number="527"></td>
        <td id="LC527" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L528" class="blob-num js-line-number" data-line-number="528"></td>
        <td id="LC528" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L529" class="blob-num js-line-number" data-line-number="529"></td>
        <td id="LC529" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L530" class="blob-num js-line-number" data-line-number="530"></td>
        <td id="LC530" class="blob-code blob-code-inner js-file-line">	bbr-&gt;mode = BBR_PROBE_BW;</td>
      </tr>
      <tr>
        <td id="L531" class="blob-num js-line-number" data-line-number="531"></td>
        <td id="LC531" class="blob-code blob-code-inner js-file-line">	bbr-&gt;pacing_gain = BBR_UNIT;</td>
      </tr>
      <tr>
        <td id="L532" class="blob-num js-line-number" data-line-number="532"></td>
        <td id="LC532" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cwnd_gain = bbr_cwnd_gain;</td>
      </tr>
      <tr>
        <td id="L533" class="blob-num js-line-number" data-line-number="533"></td>
        <td id="LC533" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cycle_idx = CYCLE_LEN - <span class="pl-c1">1</span> - <span class="pl-c1">prandom_u32_max</span>(bbr_cycle_rand);</td>
      </tr>
      <tr>
        <td id="L534" class="blob-num js-line-number" data-line-number="534"></td>
        <td id="LC534" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_advance_cycle_phase</span>(sk);	<span class="pl-c"><span class="pl-c">/*</span> flip to next phase of gain cycle <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L535" class="blob-num js-line-number" data-line-number="535"></td>
        <td id="LC535" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L536" class="blob-num js-line-number" data-line-number="536"></td>
        <td id="LC536" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L537" class="blob-num js-line-number" data-line-number="537"></td>
        <td id="LC537" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_reset_mode</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L538" class="blob-num js-line-number" data-line-number="538"></td>
        <td id="LC538" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L539" class="blob-num js-line-number" data-line-number="539"></td>
        <td id="LC539" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!<span class="pl-c1">bbr_full_bw_reached</span>(sk))</td>
      </tr>
      <tr>
        <td id="L540" class="blob-num js-line-number" data-line-number="540"></td>
        <td id="LC540" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_startup_mode</span>(sk);</td>
      </tr>
      <tr>
        <td id="L541" class="blob-num js-line-number" data-line-number="541"></td>
        <td id="LC541" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">else</span></td>
      </tr>
      <tr>
        <td id="L542" class="blob-num js-line-number" data-line-number="542"></td>
        <td id="LC542" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_probe_bw_mode</span>(sk);</td>
      </tr>
      <tr>
        <td id="L543" class="blob-num js-line-number" data-line-number="543"></td>
        <td id="LC543" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L544" class="blob-num js-line-number" data-line-number="544"></td>
        <td id="LC544" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L545" class="blob-num js-line-number" data-line-number="545"></td>
        <td id="LC545" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Start a new long-term sampling interval. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L546" class="blob-num js-line-number" data-line-number="546"></td>
        <td id="LC546" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_reset_lt_bw_sampling_interval</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L547" class="blob-num js-line-number" data-line-number="547"></td>
        <td id="LC547" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L548" class="blob-num js-line-number" data-line-number="548"></td>
        <td id="LC548" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L549" class="blob-num js-line-number" data-line-number="549"></td>
        <td id="LC549" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L550" class="blob-num js-line-number" data-line-number="550"></td>
        <td id="LC550" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L551" class="blob-num js-line-number" data-line-number="551"></td>
        <td id="LC551" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_last_stamp = tp-&gt;delivered_mstamp.<span class="pl-smi">stamp_jiffies</span>;</td>
      </tr>
      <tr>
        <td id="L552" class="blob-num js-line-number" data-line-number="552"></td>
        <td id="LC552" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_last_delivered = tp-&gt;delivered;</td>
      </tr>
      <tr>
        <td id="L553" class="blob-num js-line-number" data-line-number="553"></td>
        <td id="LC553" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_last_lost = tp-&gt;lost;</td>
      </tr>
      <tr>
        <td id="L554" class="blob-num js-line-number" data-line-number="554"></td>
        <td id="LC554" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_rtt_cnt = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L555" class="blob-num js-line-number" data-line-number="555"></td>
        <td id="LC555" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L556" class="blob-num js-line-number" data-line-number="556"></td>
        <td id="LC556" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L557" class="blob-num js-line-number" data-line-number="557"></td>
        <td id="LC557" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Completely reset long-term bandwidth sampling. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L558" class="blob-num js-line-number" data-line-number="558"></td>
        <td id="LC558" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_reset_lt_bw_sampling</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L559" class="blob-num js-line-number" data-line-number="559"></td>
        <td id="LC559" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L560" class="blob-num js-line-number" data-line-number="560"></td>
        <td id="LC560" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L561" class="blob-num js-line-number" data-line-number="561"></td>
        <td id="LC561" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L562" class="blob-num js-line-number" data-line-number="562"></td>
        <td id="LC562" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_bw = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L563" class="blob-num js-line-number" data-line-number="563"></td>
        <td id="LC563" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_use_bw = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L564" class="blob-num js-line-number" data-line-number="564"></td>
        <td id="LC564" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_is_sampling = <span class="pl-c1">false</span>;</td>
      </tr>
      <tr>
        <td id="L565" class="blob-num js-line-number" data-line-number="565"></td>
        <td id="LC565" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_reset_lt_bw_sampling_interval</span>(sk);</td>
      </tr>
      <tr>
        <td id="L566" class="blob-num js-line-number" data-line-number="566"></td>
        <td id="LC566" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L567" class="blob-num js-line-number" data-line-number="567"></td>
        <td id="LC567" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L568" class="blob-num js-line-number" data-line-number="568"></td>
        <td id="LC568" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Long-term bw sampling interval is done. Estimate whether we&#39;re policed. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L569" class="blob-num js-line-number" data-line-number="569"></td>
        <td id="LC569" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_lt_bw_interval_done</span>(<span class="pl-k">struct</span> sock *sk, u32 bw)</td>
      </tr>
      <tr>
        <td id="L570" class="blob-num js-line-number" data-line-number="570"></td>
        <td id="LC570" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L571" class="blob-num js-line-number" data-line-number="571"></td>
        <td id="LC571" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L572" class="blob-num js-line-number" data-line-number="572"></td>
        <td id="LC572" class="blob-code blob-code-inner js-file-line">	u32 diff;</td>
      </tr>
      <tr>
        <td id="L573" class="blob-num js-line-number" data-line-number="573"></td>
        <td id="LC573" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L574" class="blob-num js-line-number" data-line-number="574"></td>
        <td id="LC574" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;lt_bw) {  <span class="pl-c"><span class="pl-c">/*</span> do we have bw from a previous interval? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L575" class="blob-num js-line-number" data-line-number="575"></td>
        <td id="LC575" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Is new bw close to the lt_bw from the previous interval? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L576" class="blob-num js-line-number" data-line-number="576"></td>
        <td id="LC576" class="blob-code blob-code-inner js-file-line">		diff = <span class="pl-c1">abs</span>(bw - bbr-&gt;lt_bw);</td>
      </tr>
      <tr>
        <td id="L577" class="blob-num js-line-number" data-line-number="577"></td>
        <td id="LC577" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">if</span> ((diff * BBR_UNIT &lt;= bbr_lt_bw_ratio * bbr-&gt;lt_bw) ||</td>
      </tr>
      <tr>
        <td id="L578" class="blob-num js-line-number" data-line-number="578"></td>
        <td id="LC578" class="blob-code blob-code-inner js-file-line">		    (<span class="pl-c1">bbr_rate_bytes_per_sec</span>(sk, diff, BBR_UNIT) &lt;=</td>
      </tr>
      <tr>
        <td id="L579" class="blob-num js-line-number" data-line-number="579"></td>
        <td id="LC579" class="blob-code blob-code-inner js-file-line">		     bbr_lt_bw_diff)) {</td>
      </tr>
      <tr>
        <td id="L580" class="blob-num js-line-number" data-line-number="580"></td>
        <td id="LC580" class="blob-code blob-code-inner js-file-line">			<span class="pl-c"><span class="pl-c">/*</span> All criteria are met; estimate we&#39;re policed. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L581" class="blob-num js-line-number" data-line-number="581"></td>
        <td id="LC581" class="blob-code blob-code-inner js-file-line">			bbr-&gt;lt_bw = (bw + bbr-&gt;lt_bw) &gt;&gt; <span class="pl-c1">1</span>;  <span class="pl-c"><span class="pl-c">/*</span> avg 2 intvls <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L582" class="blob-num js-line-number" data-line-number="582"></td>
        <td id="LC582" class="blob-code blob-code-inner js-file-line">			bbr-&gt;lt_use_bw = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L583" class="blob-num js-line-number" data-line-number="583"></td>
        <td id="LC583" class="blob-code blob-code-inner js-file-line">			bbr-&gt;pacing_gain = BBR_UNIT;  <span class="pl-c"><span class="pl-c">/*</span> try to avoid drops <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L584" class="blob-num js-line-number" data-line-number="584"></td>
        <td id="LC584" class="blob-code blob-code-inner js-file-line">			bbr-&gt;lt_rtt_cnt = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L585" class="blob-num js-line-number" data-line-number="585"></td>
        <td id="LC585" class="blob-code blob-code-inner js-file-line">			<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L586" class="blob-num js-line-number" data-line-number="586"></td>
        <td id="LC586" class="blob-code blob-code-inner js-file-line">		}</td>
      </tr>
      <tr>
        <td id="L587" class="blob-num js-line-number" data-line-number="587"></td>
        <td id="LC587" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L588" class="blob-num js-line-number" data-line-number="588"></td>
        <td id="LC588" class="blob-code blob-code-inner js-file-line">	bbr-&gt;lt_bw = bw;</td>
      </tr>
      <tr>
        <td id="L589" class="blob-num js-line-number" data-line-number="589"></td>
        <td id="LC589" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_reset_lt_bw_sampling_interval</span>(sk);</td>
      </tr>
      <tr>
        <td id="L590" class="blob-num js-line-number" data-line-number="590"></td>
        <td id="LC590" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L591" class="blob-num js-line-number" data-line-number="591"></td>
        <td id="LC591" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L592" class="blob-num js-line-number" data-line-number="592"></td>
        <td id="LC592" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Token-bucket traffic policers are common (see &quot;An Internet-Wide Analysis of</span></td>
      </tr>
      <tr>
        <td id="L593" class="blob-num js-line-number" data-line-number="593"></td>
        <td id="LC593" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Traffic Policing&quot;, SIGCOMM 2016). BBR detects token-bucket policers and</span></td>
      </tr>
      <tr>
        <td id="L594" class="blob-num js-line-number" data-line-number="594"></td>
        <td id="LC594" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * explicitly models their policed rate, to reduce unnecessary losses. We</span></td>
      </tr>
      <tr>
        <td id="L595" class="blob-num js-line-number" data-line-number="595"></td>
        <td id="LC595" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * estimate that we&#39;re policed if we see 2 consecutive sampling intervals with</span></td>
      </tr>
      <tr>
        <td id="L596" class="blob-num js-line-number" data-line-number="596"></td>
        <td id="LC596" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * consistent throughput and high packet loss. If we think we&#39;re being policed,</span></td>
      </tr>
      <tr>
        <td id="L597" class="blob-num js-line-number" data-line-number="597"></td>
        <td id="LC597" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * set lt_bw to the &quot;long-term&quot; average delivery rate from those 2 intervals.</span></td>
      </tr>
      <tr>
        <td id="L598" class="blob-num js-line-number" data-line-number="598"></td>
        <td id="LC598" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L599" class="blob-num js-line-number" data-line-number="599"></td>
        <td id="LC599" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_lt_bw_sampling</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L600" class="blob-num js-line-number" data-line-number="600"></td>
        <td id="LC600" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L601" class="blob-num js-line-number" data-line-number="601"></td>
        <td id="LC601" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L602" class="blob-num js-line-number" data-line-number="602"></td>
        <td id="LC602" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L603" class="blob-num js-line-number" data-line-number="603"></td>
        <td id="LC603" class="blob-code blob-code-inner js-file-line">	u32 lost, delivered;</td>
      </tr>
      <tr>
        <td id="L604" class="blob-num js-line-number" data-line-number="604"></td>
        <td id="LC604" class="blob-code blob-code-inner js-file-line">	u64 bw;</td>
      </tr>
      <tr>
        <td id="L605" class="blob-num js-line-number" data-line-number="605"></td>
        <td id="LC605" class="blob-code blob-code-inner js-file-line">	s32 t;</td>
      </tr>
      <tr>
        <td id="L606" class="blob-num js-line-number" data-line-number="606"></td>
        <td id="LC606" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L607" class="blob-num js-line-number" data-line-number="607"></td>
        <td id="LC607" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;lt_use_bw) {	<span class="pl-c"><span class="pl-c">/*</span> already using long-term rate, lt_bw? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L608" class="blob-num js-line-number" data-line-number="608"></td>
        <td id="LC608" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">if</span> (bbr-&gt;mode == BBR_PROBE_BW &amp;&amp; bbr-&gt;round_start &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L609" class="blob-num js-line-number" data-line-number="609"></td>
        <td id="LC609" class="blob-code blob-code-inner js-file-line">		    ++bbr-&gt;lt_rtt_cnt &gt;= bbr_lt_bw_max_rtts) {</td>
      </tr>
      <tr>
        <td id="L610" class="blob-num js-line-number" data-line-number="610"></td>
        <td id="LC610" class="blob-code blob-code-inner js-file-line">			<span class="pl-c1">bbr_reset_lt_bw_sampling</span>(sk);    <span class="pl-c"><span class="pl-c">/*</span> stop using lt_bw <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L611" class="blob-num js-line-number" data-line-number="611"></td>
        <td id="LC611" class="blob-code blob-code-inner js-file-line">			<span class="pl-c1">bbr_reset_probe_bw_mode</span>(sk);  <span class="pl-c"><span class="pl-c">/*</span> restart gain cycling <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L612" class="blob-num js-line-number" data-line-number="612"></td>
        <td id="LC612" class="blob-code blob-code-inner js-file-line">		}</td>
      </tr>
      <tr>
        <td id="L613" class="blob-num js-line-number" data-line-number="613"></td>
        <td id="LC613" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L614" class="blob-num js-line-number" data-line-number="614"></td>
        <td id="LC614" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L615" class="blob-num js-line-number" data-line-number="615"></td>
        <td id="LC615" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L616" class="blob-num js-line-number" data-line-number="616"></td>
        <td id="LC616" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Wait for the first loss before sampling, to let the policer exhaust</span></td>
      </tr>
      <tr>
        <td id="L617" class="blob-num js-line-number" data-line-number="617"></td>
        <td id="LC617" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * its tokens and estimate the steady-state rate allowed by the policer.</span></td>
      </tr>
      <tr>
        <td id="L618" class="blob-num js-line-number" data-line-number="618"></td>
        <td id="LC618" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * Starting samples earlier includes bursts that over-estimate the bw.</span></td>
      </tr>
      <tr>
        <td id="L619" class="blob-num js-line-number" data-line-number="619"></td>
        <td id="LC619" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L620" class="blob-num js-line-number" data-line-number="620"></td>
        <td id="LC620" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!bbr-&gt;lt_is_sampling) {</td>
      </tr>
      <tr>
        <td id="L621" class="blob-num js-line-number" data-line-number="621"></td>
        <td id="LC621" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">if</span> (!rs-&gt;losses)</td>
      </tr>
      <tr>
        <td id="L622" class="blob-num js-line-number" data-line-number="622"></td>
        <td id="LC622" class="blob-code blob-code-inner js-file-line">			<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L623" class="blob-num js-line-number" data-line-number="623"></td>
        <td id="LC623" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_lt_bw_sampling_interval</span>(sk);</td>
      </tr>
      <tr>
        <td id="L624" class="blob-num js-line-number" data-line-number="624"></td>
        <td id="LC624" class="blob-code blob-code-inner js-file-line">		bbr-&gt;lt_is_sampling = <span class="pl-c1">true</span>;</td>
      </tr>
      <tr>
        <td id="L625" class="blob-num js-line-number" data-line-number="625"></td>
        <td id="LC625" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L626" class="blob-num js-line-number" data-line-number="626"></td>
        <td id="LC626" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L627" class="blob-num js-line-number" data-line-number="627"></td>
        <td id="LC627" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> To avoid underestimates, reset sampling if we run out of data. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L628" class="blob-num js-line-number" data-line-number="628"></td>
        <td id="LC628" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (rs-&gt;is_app_limited) {</td>
      </tr>
      <tr>
        <td id="L629" class="blob-num js-line-number" data-line-number="629"></td>
        <td id="LC629" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_lt_bw_sampling</span>(sk);</td>
      </tr>
      <tr>
        <td id="L630" class="blob-num js-line-number" data-line-number="630"></td>
        <td id="LC630" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L631" class="blob-num js-line-number" data-line-number="631"></td>
        <td id="LC631" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L632" class="blob-num js-line-number" data-line-number="632"></td>
        <td id="LC632" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L633" class="blob-num js-line-number" data-line-number="633"></td>
        <td id="LC633" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;round_start)</td>
      </tr>
      <tr>
        <td id="L634" class="blob-num js-line-number" data-line-number="634"></td>
        <td id="LC634" class="blob-code blob-code-inner js-file-line">		bbr-&gt;lt_rtt_cnt++;	<span class="pl-c"><span class="pl-c">/*</span> count round trips in this interval <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L635" class="blob-num js-line-number" data-line-number="635"></td>
        <td id="LC635" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;lt_rtt_cnt &lt; bbr_lt_intvl_min_rtts)</td>
      </tr>
      <tr>
        <td id="L636" class="blob-num js-line-number" data-line-number="636"></td>
        <td id="LC636" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;		<span class="pl-c"><span class="pl-c">/*</span> sampling interval needs to be longer <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L637" class="blob-num js-line-number" data-line-number="637"></td>
        <td id="LC637" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;lt_rtt_cnt &gt; <span class="pl-c1">4</span> * bbr_lt_intvl_min_rtts) {</td>
      </tr>
      <tr>
        <td id="L638" class="blob-num js-line-number" data-line-number="638"></td>
        <td id="LC638" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_lt_bw_sampling</span>(sk);  <span class="pl-c"><span class="pl-c">/*</span> interval is too long <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L639" class="blob-num js-line-number" data-line-number="639"></td>
        <td id="LC639" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L640" class="blob-num js-line-number" data-line-number="640"></td>
        <td id="LC640" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L641" class="blob-num js-line-number" data-line-number="641"></td>
        <td id="LC641" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L642" class="blob-num js-line-number" data-line-number="642"></td>
        <td id="LC642" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> End sampling interval when a packet is lost, so we estimate the</span></td>
      </tr>
      <tr>
        <td id="L643" class="blob-num js-line-number" data-line-number="643"></td>
        <td id="LC643" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * policer tokens were exhausted. Stopping the sampling before the</span></td>
      </tr>
      <tr>
        <td id="L644" class="blob-num js-line-number" data-line-number="644"></td>
        <td id="LC644" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * tokens are exhausted under-estimates the policed rate.</span></td>
      </tr>
      <tr>
        <td id="L645" class="blob-num js-line-number" data-line-number="645"></td>
        <td id="LC645" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L646" class="blob-num js-line-number" data-line-number="646"></td>
        <td id="LC646" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!rs-&gt;losses)</td>
      </tr>
      <tr>
        <td id="L647" class="blob-num js-line-number" data-line-number="647"></td>
        <td id="LC647" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L648" class="blob-num js-line-number" data-line-number="648"></td>
        <td id="LC648" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L649" class="blob-num js-line-number" data-line-number="649"></td>
        <td id="LC649" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Calculate packets lost and delivered in sampling interval. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L650" class="blob-num js-line-number" data-line-number="650"></td>
        <td id="LC650" class="blob-code blob-code-inner js-file-line">	lost = tp-&gt;lost - bbr-&gt;lt_last_lost;</td>
      </tr>
      <tr>
        <td id="L651" class="blob-num js-line-number" data-line-number="651"></td>
        <td id="LC651" class="blob-code blob-code-inner js-file-line">	delivered = tp-&gt;delivered - bbr-&gt;lt_last_delivered;</td>
      </tr>
      <tr>
        <td id="L652" class="blob-num js-line-number" data-line-number="652"></td>
        <td id="LC652" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Is loss rate (lost/delivered) &gt;= lt_loss_thresh? If not, wait. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L653" class="blob-num js-line-number" data-line-number="653"></td>
        <td id="LC653" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!delivered || (lost &lt;&lt; BBR_SCALE) &lt; bbr_lt_loss_thresh * delivered)</td>
      </tr>
      <tr>
        <td id="L654" class="blob-num js-line-number" data-line-number="654"></td>
        <td id="LC654" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L655" class="blob-num js-line-number" data-line-number="655"></td>
        <td id="LC655" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L656" class="blob-num js-line-number" data-line-number="656"></td>
        <td id="LC656" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Find average delivery rate in this sampling interval. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L657" class="blob-num js-line-number" data-line-number="657"></td>
        <td id="LC657" class="blob-code blob-code-inner js-file-line">	t = (s32)(tp-&gt;delivered_mstamp.<span class="pl-smi">stamp_jiffies</span> - bbr-&gt;lt_last_stamp);</td>
      </tr>
      <tr>
        <td id="L658" class="blob-num js-line-number" data-line-number="658"></td>
        <td id="LC658" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (t &lt; <span class="pl-c1">1</span>)</td>
      </tr>
      <tr>
        <td id="L659" class="blob-num js-line-number" data-line-number="659"></td>
        <td id="LC659" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;		<span class="pl-c"><span class="pl-c">/*</span> interval is less than one jiffy, so wait <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L660" class="blob-num js-line-number" data-line-number="660"></td>
        <td id="LC660" class="blob-code blob-code-inner js-file-line">	t = <span class="pl-c1">jiffies_to_usecs</span>(t);</td>
      </tr>
      <tr>
        <td id="L661" class="blob-num js-line-number" data-line-number="661"></td>
        <td id="LC661" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Interval long enough for jiffies_to_usecs() to return a bogus 0? <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L662" class="blob-num js-line-number" data-line-number="662"></td>
        <td id="LC662" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (t &lt; <span class="pl-c1">1</span>) {</td>
      </tr>
      <tr>
        <td id="L663" class="blob-num js-line-number" data-line-number="663"></td>
        <td id="LC663" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_lt_bw_sampling</span>(sk);  <span class="pl-c"><span class="pl-c">/*</span> interval too long; reset <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L664" class="blob-num js-line-number" data-line-number="664"></td>
        <td id="LC664" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L665" class="blob-num js-line-number" data-line-number="665"></td>
        <td id="LC665" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L666" class="blob-num js-line-number" data-line-number="666"></td>
        <td id="LC666" class="blob-code blob-code-inner js-file-line">	bw = (u64)delivered * BW_UNIT;</td>
      </tr>
      <tr>
        <td id="L667" class="blob-num js-line-number" data-line-number="667"></td>
        <td id="LC667" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">do_div</span>(bw, t);</td>
      </tr>
      <tr>
        <td id="L668" class="blob-num js-line-number" data-line-number="668"></td>
        <td id="LC668" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_lt_bw_interval_done</span>(sk, bw);</td>
      </tr>
      <tr>
        <td id="L669" class="blob-num js-line-number" data-line-number="669"></td>
        <td id="LC669" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L670" class="blob-num js-line-number" data-line-number="670"></td>
        <td id="LC670" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L671" class="blob-num js-line-number" data-line-number="671"></td>
        <td id="LC671" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Estimate the bandwidth based on how fast packets are delivered <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L672" class="blob-num js-line-number" data-line-number="672"></td>
        <td id="LC672" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_update_bw</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L673" class="blob-num js-line-number" data-line-number="673"></td>
        <td id="LC673" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L674" class="blob-num js-line-number" data-line-number="674"></td>
        <td id="LC674" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L675" class="blob-num js-line-number" data-line-number="675"></td>
        <td id="LC675" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L676" class="blob-num js-line-number" data-line-number="676"></td>
        <td id="LC676" class="blob-code blob-code-inner js-file-line">	u64 bw;</td>
      </tr>
      <tr>
        <td id="L677" class="blob-num js-line-number" data-line-number="677"></td>
        <td id="LC677" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L678" class="blob-num js-line-number" data-line-number="678"></td>
        <td id="LC678" class="blob-code blob-code-inner js-file-line">	bbr-&gt;round_start = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L679" class="blob-num js-line-number" data-line-number="679"></td>
        <td id="LC679" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (rs-&gt;delivered &lt; <span class="pl-c1">0</span> || rs-&gt;interval_us &lt;= <span class="pl-c1">0</span>)</td>
      </tr>
      <tr>
        <td id="L680" class="blob-num js-line-number" data-line-number="680"></td>
        <td id="LC680" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>; <span class="pl-c"><span class="pl-c">/*</span> Not a valid observation <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L681" class="blob-num js-line-number" data-line-number="681"></td>
        <td id="LC681" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L682" class="blob-num js-line-number" data-line-number="682"></td>
        <td id="LC682" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> See if we&#39;ve reached the next RTT <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L683" class="blob-num js-line-number" data-line-number="683"></td>
        <td id="LC683" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!<span class="pl-c1">before</span>(rs-&gt;prior_delivered, bbr-&gt;next_rtt_delivered)) {</td>
      </tr>
      <tr>
        <td id="L684" class="blob-num js-line-number" data-line-number="684"></td>
        <td id="LC684" class="blob-code blob-code-inner js-file-line">		bbr-&gt;next_rtt_delivered = tp-&gt;delivered;</td>
      </tr>
      <tr>
        <td id="L685" class="blob-num js-line-number" data-line-number="685"></td>
        <td id="LC685" class="blob-code blob-code-inner js-file-line">		bbr-&gt;rtt_cnt++;</td>
      </tr>
      <tr>
        <td id="L686" class="blob-num js-line-number" data-line-number="686"></td>
        <td id="LC686" class="blob-code blob-code-inner js-file-line">		bbr-&gt;round_start = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L687" class="blob-num js-line-number" data-line-number="687"></td>
        <td id="LC687" class="blob-code blob-code-inner js-file-line">		bbr-&gt;packet_conservation = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L688" class="blob-num js-line-number" data-line-number="688"></td>
        <td id="LC688" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L689" class="blob-num js-line-number" data-line-number="689"></td>
        <td id="LC689" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L690" class="blob-num js-line-number" data-line-number="690"></td>
        <td id="LC690" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_lt_bw_sampling</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L691" class="blob-num js-line-number" data-line-number="691"></td>
        <td id="LC691" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L692" class="blob-num js-line-number" data-line-number="692"></td>
        <td id="LC692" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Divide delivered by the interval to find a (lower bound) bottleneck</span></td>
      </tr>
      <tr>
        <td id="L693" class="blob-num js-line-number" data-line-number="693"></td>
        <td id="LC693" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * bandwidth sample. Delivered is in packets and interval_us in uS and</span></td>
      </tr>
      <tr>
        <td id="L694" class="blob-num js-line-number" data-line-number="694"></td>
        <td id="LC694" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * ratio will be &lt;&lt;1 for most connections. So delivered is first scaled.</span></td>
      </tr>
      <tr>
        <td id="L695" class="blob-num js-line-number" data-line-number="695"></td>
        <td id="LC695" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L696" class="blob-num js-line-number" data-line-number="696"></td>
        <td id="LC696" class="blob-code blob-code-inner js-file-line">	bw = (u64)rs-&gt;delivered * BW_UNIT;</td>
      </tr>
      <tr>
        <td id="L697" class="blob-num js-line-number" data-line-number="697"></td>
        <td id="LC697" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">do_div</span>(bw, rs-&gt;interval_us);</td>
      </tr>
      <tr>
        <td id="L698" class="blob-num js-line-number" data-line-number="698"></td>
        <td id="LC698" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L699" class="blob-num js-line-number" data-line-number="699"></td>
        <td id="LC699" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> If this sample is application-limited, it is likely to have a very</span></td>
      </tr>
      <tr>
        <td id="L700" class="blob-num js-line-number" data-line-number="700"></td>
        <td id="LC700" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * low delivered count that represents application behavior rather than</span></td>
      </tr>
      <tr>
        <td id="L701" class="blob-num js-line-number" data-line-number="701"></td>
        <td id="LC701" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * the available network rate. Such a sample could drag down estimated</span></td>
      </tr>
      <tr>
        <td id="L702" class="blob-num js-line-number" data-line-number="702"></td>
        <td id="LC702" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * bw, causing needless slow-down. Thus, to continue to send at the</span></td>
      </tr>
      <tr>
        <td id="L703" class="blob-num js-line-number" data-line-number="703"></td>
        <td id="LC703" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * last measured network rate, we filter out app-limited samples unless</span></td>
      </tr>
      <tr>
        <td id="L704" class="blob-num js-line-number" data-line-number="704"></td>
        <td id="LC704" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * they describe the path bw at least as well as our bw model.</span></td>
      </tr>
      <tr>
        <td id="L705" class="blob-num js-line-number" data-line-number="705"></td>
        <td id="LC705" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 *</span></td>
      </tr>
      <tr>
        <td id="L706" class="blob-num js-line-number" data-line-number="706"></td>
        <td id="LC706" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * So the goal during app-limited phase is to proceed with the best</span></td>
      </tr>
      <tr>
        <td id="L707" class="blob-num js-line-number" data-line-number="707"></td>
        <td id="LC707" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * network rate no matter how long. We automatically leave this</span></td>
      </tr>
      <tr>
        <td id="L708" class="blob-num js-line-number" data-line-number="708"></td>
        <td id="LC708" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 * phase when app writes faster than the network can deliver :)</span></td>
      </tr>
      <tr>
        <td id="L709" class="blob-num js-line-number" data-line-number="709"></td>
        <td id="LC709" class="blob-code blob-code-inner js-file-line"><span class="pl-c">	 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L710" class="blob-num js-line-number" data-line-number="710"></td>
        <td id="LC710" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (!rs-&gt;is_app_limited || bw &gt;= <span class="pl-c1">bbr_max_bw</span>(sk)) {</td>
      </tr>
      <tr>
        <td id="L711" class="blob-num js-line-number" data-line-number="711"></td>
        <td id="LC711" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Incorporate new sample into our max bw filter. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L712" class="blob-num js-line-number" data-line-number="712"></td>
        <td id="LC712" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">minmax_running_max</span>(&amp;bbr-&gt;bw, bbr_bw_rtts, bbr-&gt;rtt_cnt, bw);</td>
      </tr>
      <tr>
        <td id="L713" class="blob-num js-line-number" data-line-number="713"></td>
        <td id="LC713" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L714" class="blob-num js-line-number" data-line-number="714"></td>
        <td id="LC714" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L715" class="blob-num js-line-number" data-line-number="715"></td>
        <td id="LC715" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L716" class="blob-num js-line-number" data-line-number="716"></td>
        <td id="LC716" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Estimate when the pipe is full, using the change in delivery rate: BBR</span></td>
      </tr>
      <tr>
        <td id="L717" class="blob-num js-line-number" data-line-number="717"></td>
        <td id="LC717" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * estimates that STARTUP filled the pipe if the estimated bw hasn&#39;t changed by</span></td>
      </tr>
      <tr>
        <td id="L718" class="blob-num js-line-number" data-line-number="718"></td>
        <td id="LC718" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * at least bbr_full_bw_thresh (25%) after bbr_full_bw_cnt (3) non-app-limited</span></td>
      </tr>
      <tr>
        <td id="L719" class="blob-num js-line-number" data-line-number="719"></td>
        <td id="LC719" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * rounds. Why 3 rounds: 1: rwin autotuning grows the rwin, 2: we fill the</span></td>
      </tr>
      <tr>
        <td id="L720" class="blob-num js-line-number" data-line-number="720"></td>
        <td id="LC720" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * higher rwin, 3: we get higher delivery rate samples. Or transient</span></td>
      </tr>
      <tr>
        <td id="L721" class="blob-num js-line-number" data-line-number="721"></td>
        <td id="LC721" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * cross-traffic or radio noise can go away. CUBIC Hystart shares a similar</span></td>
      </tr>
      <tr>
        <td id="L722" class="blob-num js-line-number" data-line-number="722"></td>
        <td id="LC722" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * design goal, but uses delay and inter-ACK spacing instead of bandwidth.</span></td>
      </tr>
      <tr>
        <td id="L723" class="blob-num js-line-number" data-line-number="723"></td>
        <td id="LC723" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L724" class="blob-num js-line-number" data-line-number="724"></td>
        <td id="LC724" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_check_full_bw_reached</span>(<span class="pl-k">struct</span> sock *sk,</td>
      </tr>
      <tr>
        <td id="L725" class="blob-num js-line-number" data-line-number="725"></td>
        <td id="LC725" class="blob-code blob-code-inner js-file-line">				      <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L726" class="blob-num js-line-number" data-line-number="726"></td>
        <td id="LC726" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L727" class="blob-num js-line-number" data-line-number="727"></td>
        <td id="LC727" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L728" class="blob-num js-line-number" data-line-number="728"></td>
        <td id="LC728" class="blob-code blob-code-inner js-file-line">	u32 bw_thresh;</td>
      </tr>
      <tr>
        <td id="L729" class="blob-num js-line-number" data-line-number="729"></td>
        <td id="LC729" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L730" class="blob-num js-line-number" data-line-number="730"></td>
        <td id="LC730" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (<span class="pl-c1">bbr_full_bw_reached</span>(sk) || !bbr-&gt;round_start || rs-&gt;is_app_limited)</td>
      </tr>
      <tr>
        <td id="L731" class="blob-num js-line-number" data-line-number="731"></td>
        <td id="LC731" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L732" class="blob-num js-line-number" data-line-number="732"></td>
        <td id="LC732" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L733" class="blob-num js-line-number" data-line-number="733"></td>
        <td id="LC733" class="blob-code blob-code-inner js-file-line">	bw_thresh = (u64)bbr-&gt;full_bw * bbr_full_bw_thresh &gt;&gt; BBR_SCALE;</td>
      </tr>
      <tr>
        <td id="L734" class="blob-num js-line-number" data-line-number="734"></td>
        <td id="LC734" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (<span class="pl-c1">bbr_max_bw</span>(sk) &gt;= bw_thresh) {</td>
      </tr>
      <tr>
        <td id="L735" class="blob-num js-line-number" data-line-number="735"></td>
        <td id="LC735" class="blob-code blob-code-inner js-file-line">		bbr-&gt;full_bw = <span class="pl-c1">bbr_max_bw</span>(sk);</td>
      </tr>
      <tr>
        <td id="L736" class="blob-num js-line-number" data-line-number="736"></td>
        <td id="LC736" class="blob-code blob-code-inner js-file-line">		bbr-&gt;full_bw_cnt = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L737" class="blob-num js-line-number" data-line-number="737"></td>
        <td id="LC737" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span>;</td>
      </tr>
      <tr>
        <td id="L738" class="blob-num js-line-number" data-line-number="738"></td>
        <td id="LC738" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L739" class="blob-num js-line-number" data-line-number="739"></td>
        <td id="LC739" class="blob-code blob-code-inner js-file-line">	++bbr-&gt;full_bw_cnt;</td>
      </tr>
      <tr>
        <td id="L740" class="blob-num js-line-number" data-line-number="740"></td>
        <td id="LC740" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L741" class="blob-num js-line-number" data-line-number="741"></td>
        <td id="LC741" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L742" class="blob-num js-line-number" data-line-number="742"></td>
        <td id="LC742" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> If pipe is probably full, drain the queue and then enter steady-state. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L743" class="blob-num js-line-number" data-line-number="743"></td>
        <td id="LC743" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_check_drain</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L744" class="blob-num js-line-number" data-line-number="744"></td>
        <td id="LC744" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L745" class="blob-num js-line-number" data-line-number="745"></td>
        <td id="LC745" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L746" class="blob-num js-line-number" data-line-number="746"></td>
        <td id="LC746" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L747" class="blob-num js-line-number" data-line-number="747"></td>
        <td id="LC747" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;mode == BBR_STARTUP &amp;&amp; <span class="pl-c1">bbr_full_bw_reached</span>(sk)) {</td>
      </tr>
      <tr>
        <td id="L748" class="blob-num js-line-number" data-line-number="748"></td>
        <td id="LC748" class="blob-code blob-code-inner js-file-line">		bbr-&gt;mode = BBR_DRAIN;	<span class="pl-c"><span class="pl-c">/*</span> drain queue we created <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L749" class="blob-num js-line-number" data-line-number="749"></td>
        <td id="LC749" class="blob-code blob-code-inner js-file-line">		bbr-&gt;pacing_gain = bbr_drain_gain;	<span class="pl-c"><span class="pl-c">/*</span> pace slow to drain <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L750" class="blob-num js-line-number" data-line-number="750"></td>
        <td id="LC750" class="blob-code blob-code-inner js-file-line">		bbr-&gt;cwnd_gain = bbr_high_gain;	<span class="pl-c"><span class="pl-c">/*</span> maintain cwnd <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L751" class="blob-num js-line-number" data-line-number="751"></td>
        <td id="LC751" class="blob-code blob-code-inner js-file-line">	}	<span class="pl-c"><span class="pl-c">/*</span> fall through to check if in-flight is already small: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L752" class="blob-num js-line-number" data-line-number="752"></td>
        <td id="LC752" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;mode == BBR_DRAIN &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L753" class="blob-num js-line-number" data-line-number="753"></td>
        <td id="LC753" class="blob-code blob-code-inner js-file-line">	    <span class="pl-c1">tcp_packets_in_flight</span>(<span class="pl-c1">tcp_sk</span>(sk)) &lt;=</td>
      </tr>
      <tr>
        <td id="L754" class="blob-num js-line-number" data-line-number="754"></td>
        <td id="LC754" class="blob-code blob-code-inner js-file-line">	    <span class="pl-c1">bbr_target_cwnd</span>(sk, <span class="pl-c1">bbr_max_bw</span>(sk), BBR_UNIT))</td>
      </tr>
      <tr>
        <td id="L755" class="blob-num js-line-number" data-line-number="755"></td>
        <td id="LC755" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_reset_probe_bw_mode</span>(sk);  <span class="pl-c"><span class="pl-c">/*</span> we estimate queue is drained <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L756" class="blob-num js-line-number" data-line-number="756"></td>
        <td id="LC756" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L757" class="blob-num js-line-number" data-line-number="757"></td>
        <td id="LC757" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L758" class="blob-num js-line-number" data-line-number="758"></td>
        <td id="LC758" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> The goal of PROBE_RTT mode is to have BBR flows cooperatively and</span></td>
      </tr>
      <tr>
        <td id="L759" class="blob-num js-line-number" data-line-number="759"></td>
        <td id="LC759" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * periodically drain the bottleneck queue, to converge to measure the true</span></td>
      </tr>
      <tr>
        <td id="L760" class="blob-num js-line-number" data-line-number="760"></td>
        <td id="LC760" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * min_rtt (unloaded propagation delay). This allows the flows to keep queues</span></td>
      </tr>
      <tr>
        <td id="L761" class="blob-num js-line-number" data-line-number="761"></td>
        <td id="LC761" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * small (reducing queuing delay and packet loss) and achieve fairness among</span></td>
      </tr>
      <tr>
        <td id="L762" class="blob-num js-line-number" data-line-number="762"></td>
        <td id="LC762" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * BBR flows.</span></td>
      </tr>
      <tr>
        <td id="L763" class="blob-num js-line-number" data-line-number="763"></td>
        <td id="LC763" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L764" class="blob-num js-line-number" data-line-number="764"></td>
        <td id="LC764" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * The min_rtt filter window is 10 seconds. When the min_rtt estimate expires,</span></td>
      </tr>
      <tr>
        <td id="L765" class="blob-num js-line-number" data-line-number="765"></td>
        <td id="LC765" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * we enter PROBE_RTT mode and cap the cwnd at bbr_cwnd_min_target=4 packets.</span></td>
      </tr>
      <tr>
        <td id="L766" class="blob-num js-line-number" data-line-number="766"></td>
        <td id="LC766" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * After at least bbr_probe_rtt_mode_ms=200ms and at least one packet-timed</span></td>
      </tr>
      <tr>
        <td id="L767" class="blob-num js-line-number" data-line-number="767"></td>
        <td id="LC767" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * round trip elapsed with that flight size &lt;= 4, we leave PROBE_RTT mode and</span></td>
      </tr>
      <tr>
        <td id="L768" class="blob-num js-line-number" data-line-number="768"></td>
        <td id="LC768" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * re-enter the previous mode. BBR uses 200ms to approximately bound the</span></td>
      </tr>
      <tr>
        <td id="L769" class="blob-num js-line-number" data-line-number="769"></td>
        <td id="LC769" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * performance penalty of PROBE_RTT&#39;s cwnd capping to roughly 2% (200ms/10s).</span></td>
      </tr>
      <tr>
        <td id="L770" class="blob-num js-line-number" data-line-number="770"></td>
        <td id="LC770" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> *</span></td>
      </tr>
      <tr>
        <td id="L771" class="blob-num js-line-number" data-line-number="771"></td>
        <td id="LC771" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * Note that flows need only pay 2% if they are busy sending over the last 10</span></td>
      </tr>
      <tr>
        <td id="L772" class="blob-num js-line-number" data-line-number="772"></td>
        <td id="LC772" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * seconds. Interactive applications (e.g., Web, RPCs, video chunks) often have</span></td>
      </tr>
      <tr>
        <td id="L773" class="blob-num js-line-number" data-line-number="773"></td>
        <td id="LC773" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * natural silences or low-rate periods within 10 seconds where the rate is low</span></td>
      </tr>
      <tr>
        <td id="L774" class="blob-num js-line-number" data-line-number="774"></td>
        <td id="LC774" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * enough for long enough to drain its queue in the bottleneck. We pick up</span></td>
      </tr>
      <tr>
        <td id="L775" class="blob-num js-line-number" data-line-number="775"></td>
        <td id="LC775" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * these min RTT measurements opportunistically with our min_rtt filter. :-)</span></td>
      </tr>
      <tr>
        <td id="L776" class="blob-num js-line-number" data-line-number="776"></td>
        <td id="LC776" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L777" class="blob-num js-line-number" data-line-number="777"></td>
        <td id="LC777" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_update_min_rtt</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L778" class="blob-num js-line-number" data-line-number="778"></td>
        <td id="LC778" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L779" class="blob-num js-line-number" data-line-number="779"></td>
        <td id="LC779" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L780" class="blob-num js-line-number" data-line-number="780"></td>
        <td id="LC780" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L781" class="blob-num js-line-number" data-line-number="781"></td>
        <td id="LC781" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">bool</span> filter_expired;</td>
      </tr>
      <tr>
        <td id="L782" class="blob-num js-line-number" data-line-number="782"></td>
        <td id="LC782" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L783" class="blob-num js-line-number" data-line-number="783"></td>
        <td id="LC783" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Track min RTT seen in the min_rtt_win_sec filter window: <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L784" class="blob-num js-line-number" data-line-number="784"></td>
        <td id="LC784" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">//</span> as above BBR_Structure define: &quot;min_rtt_win_sec = 5 seconds&quot;</span></td>
      </tr>
      <tr>
        <td id="L785" class="blob-num js-line-number" data-line-number="785"></td>
        <td id="LC785" class="blob-code blob-code-inner js-file-line">	filter_expired = <span class="pl-c1">after</span>(tcp_time_stamp,</td>
      </tr>
      <tr>
        <td id="L786" class="blob-num js-line-number" data-line-number="786"></td>
        <td id="LC786" class="blob-code blob-code-inner js-file-line">			       bbr-&gt;min_rtt_stamp + bbr_min_rtt_win_sec * HZ);</td>
      </tr>
      <tr>
        <td id="L787" class="blob-num js-line-number" data-line-number="787"></td>
        <td id="LC787" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (rs-&gt;rtt_us &gt;= <span class="pl-c1">0</span> &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L788" class="blob-num js-line-number" data-line-number="788"></td>
        <td id="LC788" class="blob-code blob-code-inner js-file-line">	    (rs-&gt;rtt_us &lt;= bbr-&gt;min_rtt_us || filter_expired)) {</td>
      </tr>
      <tr>
        <td id="L789" class="blob-num js-line-number" data-line-number="789"></td>
        <td id="LC789" class="blob-code blob-code-inner js-file-line">		bbr-&gt;min_rtt_us = rs-&gt;rtt_us;</td>
      </tr>
      <tr>
        <td id="L790" class="blob-num js-line-number" data-line-number="790"></td>
        <td id="LC790" class="blob-code blob-code-inner js-file-line">		bbr-&gt;min_rtt_stamp = tcp_time_stamp;</td>
      </tr>
      <tr>
        <td id="L791" class="blob-num js-line-number" data-line-number="791"></td>
        <td id="LC791" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L792" class="blob-num js-line-number" data-line-number="792"></td>
        <td id="LC792" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L793" class="blob-num js-line-number" data-line-number="793"></td>
        <td id="LC793" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr_probe_rtt_mode_ms &gt; <span class="pl-c1">0</span> &amp;&amp; filter_expired &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L794" class="blob-num js-line-number" data-line-number="794"></td>
        <td id="LC794" class="blob-code blob-code-inner js-file-line">	    !bbr-&gt;idle_restart &amp;&amp; bbr-&gt;mode != BBR_PROBE_RTT) {</td>
      </tr>
      <tr>
        <td id="L795" class="blob-num js-line-number" data-line-number="795"></td>
        <td id="LC795" class="blob-code blob-code-inner js-file-line">		bbr-&gt;mode = BBR_PROBE_RTT;  <span class="pl-c"><span class="pl-c">/*</span> dip, drain queue <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L796" class="blob-num js-line-number" data-line-number="796"></td>
        <td id="LC796" class="blob-code blob-code-inner js-file-line">		bbr-&gt;pacing_gain = BBR_UNIT;</td>
      </tr>
      <tr>
        <td id="L797" class="blob-num js-line-number" data-line-number="797"></td>
        <td id="LC797" class="blob-code blob-code-inner js-file-line">		bbr-&gt;cwnd_gain = BBR_UNIT;</td>
      </tr>
      <tr>
        <td id="L798" class="blob-num js-line-number" data-line-number="798"></td>
        <td id="LC798" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_save_cwnd</span>(sk);  <span class="pl-c"><span class="pl-c">/*</span> note cwnd so we can restore it <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L799" class="blob-num js-line-number" data-line-number="799"></td>
        <td id="LC799" class="blob-code blob-code-inner js-file-line">		bbr-&gt;probe_rtt_done_stamp = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L800" class="blob-num js-line-number" data-line-number="800"></td>
        <td id="LC800" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L801" class="blob-num js-line-number" data-line-number="801"></td>
        <td id="LC801" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L802" class="blob-num js-line-number" data-line-number="802"></td>
        <td id="LC802" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (bbr-&gt;mode == BBR_PROBE_RTT) {</td>
      </tr>
      <tr>
        <td id="L803" class="blob-num js-line-number" data-line-number="803"></td>
        <td id="LC803" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Ignore low rate samples during this mode. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L804" class="blob-num js-line-number" data-line-number="804"></td>
        <td id="LC804" class="blob-code blob-code-inner js-file-line">		tp-&gt;app_limited =</td>
      </tr>
      <tr>
        <td id="L805" class="blob-num js-line-number" data-line-number="805"></td>
        <td id="LC805" class="blob-code blob-code-inner js-file-line">			(tp-&gt;delivered + <span class="pl-c1">tcp_packets_in_flight</span>(tp)) ? : <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L806" class="blob-num js-line-number" data-line-number="806"></td>
        <td id="LC806" class="blob-code blob-code-inner js-file-line">		<span class="pl-c"><span class="pl-c">/*</span> Maintain min packets in flight for max(200 ms, 1 round). <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L807" class="blob-num js-line-number" data-line-number="807"></td>
        <td id="LC807" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">if</span> (!bbr-&gt;probe_rtt_done_stamp &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L808" class="blob-num js-line-number" data-line-number="808"></td>
        <td id="LC808" class="blob-code blob-code-inner js-file-line">		    <span class="pl-c1">tcp_packets_in_flight</span>(tp) &lt;= bbr_cwnd_min_target) {</td>
      </tr>
      <tr>
        <td id="L809" class="blob-num js-line-number" data-line-number="809"></td>
        <td id="LC809" class="blob-code blob-code-inner js-file-line">			bbr-&gt;probe_rtt_done_stamp = tcp_time_stamp +</td>
      </tr>
      <tr>
        <td id="L810" class="blob-num js-line-number" data-line-number="810"></td>
        <td id="LC810" class="blob-code blob-code-inner js-file-line">				<span class="pl-c1">msecs_to_jiffies</span>(bbr_probe_rtt_mode_ms &gt;&gt; <span class="pl-c1">1</span>);</td>
      </tr>
      <tr>
        <td id="L811" class="blob-num js-line-number" data-line-number="811"></td>
        <td id="LC811" class="blob-code blob-code-inner js-file-line">			bbr-&gt;probe_rtt_round_done = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L812" class="blob-num js-line-number" data-line-number="812"></td>
        <td id="LC812" class="blob-code blob-code-inner js-file-line">			bbr-&gt;next_rtt_delivered = tp-&gt;delivered;</td>
      </tr>
      <tr>
        <td id="L813" class="blob-num js-line-number" data-line-number="813"></td>
        <td id="LC813" class="blob-code blob-code-inner js-file-line">		} <span class="pl-k">else</span> <span class="pl-k">if</span> (bbr-&gt;probe_rtt_done_stamp) {</td>
      </tr>
      <tr>
        <td id="L814" class="blob-num js-line-number" data-line-number="814"></td>
        <td id="LC814" class="blob-code blob-code-inner js-file-line">			<span class="pl-k">if</span> (bbr-&gt;round_start)</td>
      </tr>
      <tr>
        <td id="L815" class="blob-num js-line-number" data-line-number="815"></td>
        <td id="LC815" class="blob-code blob-code-inner js-file-line">				bbr-&gt;probe_rtt_round_done = <span class="pl-c1">1</span>;</td>
      </tr>
      <tr>
        <td id="L816" class="blob-num js-line-number" data-line-number="816"></td>
        <td id="LC816" class="blob-code blob-code-inner js-file-line">			<span class="pl-k">if</span> (bbr-&gt;probe_rtt_round_done &amp;&amp;</td>
      </tr>
      <tr>
        <td id="L817" class="blob-num js-line-number" data-line-number="817"></td>
        <td id="LC817" class="blob-code blob-code-inner js-file-line">			    <span class="pl-c1">after</span>(tcp_time_stamp, bbr-&gt;probe_rtt_done_stamp)) {</td>
      </tr>
      <tr>
        <td id="L818" class="blob-num js-line-number" data-line-number="818"></td>
        <td id="LC818" class="blob-code blob-code-inner js-file-line">				bbr-&gt;min_rtt_stamp = tcp_time_stamp;</td>
      </tr>
      <tr>
        <td id="L819" class="blob-num js-line-number" data-line-number="819"></td>
        <td id="LC819" class="blob-code blob-code-inner js-file-line">				bbr-&gt;restore_cwnd = <span class="pl-c1">1</span>;  <span class="pl-c"><span class="pl-c">/*</span> snap to prior_cwnd <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L820" class="blob-num js-line-number" data-line-number="820"></td>
        <td id="LC820" class="blob-code blob-code-inner js-file-line">				<span class="pl-c1">bbr_reset_mode</span>(sk);</td>
      </tr>
      <tr>
        <td id="L821" class="blob-num js-line-number" data-line-number="821"></td>
        <td id="LC821" class="blob-code blob-code-inner js-file-line">			}</td>
      </tr>
      <tr>
        <td id="L822" class="blob-num js-line-number" data-line-number="822"></td>
        <td id="LC822" class="blob-code blob-code-inner js-file-line">		}</td>
      </tr>
      <tr>
        <td id="L823" class="blob-num js-line-number" data-line-number="823"></td>
        <td id="LC823" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L824" class="blob-num js-line-number" data-line-number="824"></td>
        <td id="LC824" class="blob-code blob-code-inner js-file-line">	bbr-&gt;idle_restart = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L825" class="blob-num js-line-number" data-line-number="825"></td>
        <td id="LC825" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L826" class="blob-num js-line-number" data-line-number="826"></td>
        <td id="LC826" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L827" class="blob-num js-line-number" data-line-number="827"></td>
        <td id="LC827" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_update_model</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L828" class="blob-num js-line-number" data-line-number="828"></td>
        <td id="LC828" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L829" class="blob-num js-line-number" data-line-number="829"></td>
        <td id="LC829" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_update_bw</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L830" class="blob-num js-line-number" data-line-number="830"></td>
        <td id="LC830" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_update_cycle_phase</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L831" class="blob-num js-line-number" data-line-number="831"></td>
        <td id="LC831" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_check_full_bw_reached</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L832" class="blob-num js-line-number" data-line-number="832"></td>
        <td id="LC832" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_check_drain</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L833" class="blob-num js-line-number" data-line-number="833"></td>
        <td id="LC833" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_update_min_rtt</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L834" class="blob-num js-line-number" data-line-number="834"></td>
        <td id="LC834" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L835" class="blob-num js-line-number" data-line-number="835"></td>
        <td id="LC835" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L836" class="blob-num js-line-number" data-line-number="836"></td>
        <td id="LC836" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_main</span>(<span class="pl-k">struct</span> sock *sk, <span class="pl-k">const</span> <span class="pl-k">struct</span> rate_sample *rs)</td>
      </tr>
      <tr>
        <td id="L837" class="blob-num js-line-number" data-line-number="837"></td>
        <td id="LC837" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L838" class="blob-num js-line-number" data-line-number="838"></td>
        <td id="LC838" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L839" class="blob-num js-line-number" data-line-number="839"></td>
        <td id="LC839" class="blob-code blob-code-inner js-file-line">	u32 bw;</td>
      </tr>
      <tr>
        <td id="L840" class="blob-num js-line-number" data-line-number="840"></td>
        <td id="LC840" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L841" class="blob-num js-line-number" data-line-number="841"></td>
        <td id="LC841" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_update_model</span>(sk, rs);</td>
      </tr>
      <tr>
        <td id="L842" class="blob-num js-line-number" data-line-number="842"></td>
        <td id="LC842" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L843" class="blob-num js-line-number" data-line-number="843"></td>
        <td id="LC843" class="blob-code blob-code-inner js-file-line">	bw = <span class="pl-c1">bbr_bw</span>(sk);</td>
      </tr>
      <tr>
        <td id="L844" class="blob-num js-line-number" data-line-number="844"></td>
        <td id="LC844" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_set_pacing_rate</span>(sk, bw, bbr-&gt;pacing_gain);</td>
      </tr>
      <tr>
        <td id="L845" class="blob-num js-line-number" data-line-number="845"></td>
        <td id="LC845" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_set_tso_segs_goal</span>(sk);</td>
      </tr>
      <tr>
        <td id="L846" class="blob-num js-line-number" data-line-number="846"></td>
        <td id="LC846" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_set_cwnd</span>(sk, rs, rs-&gt;acked_sacked, bw, bbr-&gt;cwnd_gain);</td>
      </tr>
      <tr>
        <td id="L847" class="blob-num js-line-number" data-line-number="847"></td>
        <td id="LC847" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L848" class="blob-num js-line-number" data-line-number="848"></td>
        <td id="LC848" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L849" class="blob-num js-line-number" data-line-number="849"></td>
        <td id="LC849" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_init</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L850" class="blob-num js-line-number" data-line-number="850"></td>
        <td id="LC850" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L851" class="blob-num js-line-number" data-line-number="851"></td>
        <td id="LC851" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L852" class="blob-num js-line-number" data-line-number="852"></td>
        <td id="LC852" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L853" class="blob-num js-line-number" data-line-number="853"></td>
        <td id="LC853" class="blob-code blob-code-inner js-file-line">	u64 bw;</td>
      </tr>
      <tr>
        <td id="L854" class="blob-num js-line-number" data-line-number="854"></td>
        <td id="LC854" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L855" class="blob-num js-line-number" data-line-number="855"></td>
        <td id="LC855" class="blob-code blob-code-inner js-file-line">	bbr-&gt;prior_cwnd = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L856" class="blob-num js-line-number" data-line-number="856"></td>
        <td id="LC856" class="blob-code blob-code-inner js-file-line">	bbr-&gt;tso_segs_goal = <span class="pl-c1">0</span>;	 <span class="pl-c"><span class="pl-c">/*</span> default segs per skb until first ACK <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L857" class="blob-num js-line-number" data-line-number="857"></td>
        <td id="LC857" class="blob-code blob-code-inner js-file-line">	bbr-&gt;rtt_cnt = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L858" class="blob-num js-line-number" data-line-number="858"></td>
        <td id="LC858" class="blob-code blob-code-inner js-file-line">	bbr-&gt;next_rtt_delivered = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L859" class="blob-num js-line-number" data-line-number="859"></td>
        <td id="LC859" class="blob-code blob-code-inner js-file-line">	bbr-&gt;prev_ca_state = TCP_CA_Open;</td>
      </tr>
      <tr>
        <td id="L860" class="blob-num js-line-number" data-line-number="860"></td>
        <td id="LC860" class="blob-code blob-code-inner js-file-line">	bbr-&gt;packet_conservation = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L861" class="blob-num js-line-number" data-line-number="861"></td>
        <td id="LC861" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L862" class="blob-num js-line-number" data-line-number="862"></td>
        <td id="LC862" class="blob-code blob-code-inner js-file-line">	bbr-&gt;probe_rtt_done_stamp = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L863" class="blob-num js-line-number" data-line-number="863"></td>
        <td id="LC863" class="blob-code blob-code-inner js-file-line">	bbr-&gt;probe_rtt_round_done = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L864" class="blob-num js-line-number" data-line-number="864"></td>
        <td id="LC864" class="blob-code blob-code-inner js-file-line">	bbr-&gt;min_rtt_us = <span class="pl-c1">tcp_min_rtt</span>(tp);</td>
      </tr>
      <tr>
        <td id="L865" class="blob-num js-line-number" data-line-number="865"></td>
        <td id="LC865" class="blob-code blob-code-inner js-file-line">	bbr-&gt;min_rtt_stamp = tcp_time_stamp;</td>
      </tr>
      <tr>
        <td id="L866" class="blob-num js-line-number" data-line-number="866"></td>
        <td id="LC866" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L867" class="blob-num js-line-number" data-line-number="867"></td>
        <td id="LC867" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">minmax_reset</span>(&amp;bbr-&gt;bw, bbr-&gt;rtt_cnt, <span class="pl-c1">0</span>);  <span class="pl-c"><span class="pl-c">/*</span> init max bw to 0 <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L868" class="blob-num js-line-number" data-line-number="868"></td>
        <td id="LC868" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L869" class="blob-num js-line-number" data-line-number="869"></td>
        <td id="LC869" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Initialize pacing rate to: high_gain * init_cwnd / RTT. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L870" class="blob-num js-line-number" data-line-number="870"></td>
        <td id="LC870" class="blob-code blob-code-inner js-file-line">	bw = (u64)tp-&gt;snd_cwnd * BW_UNIT;</td>
      </tr>
      <tr>
        <td id="L871" class="blob-num js-line-number" data-line-number="871"></td>
        <td id="LC871" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">do_div</span>(bw, (tp-&gt;srtt_us &gt;&gt; <span class="pl-c1">3</span>) ? : USEC_PER_MSEC);</td>
      </tr>
      <tr>
        <td id="L872" class="blob-num js-line-number" data-line-number="872"></td>
        <td id="LC872" class="blob-code blob-code-inner js-file-line">	sk-&gt;sk_pacing_rate = <span class="pl-c1">0</span>;		<span class="pl-c"><span class="pl-c">/*</span> force an update of sk_pacing_rate <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L873" class="blob-num js-line-number" data-line-number="873"></td>
        <td id="LC873" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_set_pacing_rate</span>(sk, bw, bbr_high_gain);</td>
      </tr>
      <tr>
        <td id="L874" class="blob-num js-line-number" data-line-number="874"></td>
        <td id="LC874" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L875" class="blob-num js-line-number" data-line-number="875"></td>
        <td id="LC875" class="blob-code blob-code-inner js-file-line">	bbr-&gt;restore_cwnd = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L876" class="blob-num js-line-number" data-line-number="876"></td>
        <td id="LC876" class="blob-code blob-code-inner js-file-line">	bbr-&gt;round_start = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L877" class="blob-num js-line-number" data-line-number="877"></td>
        <td id="LC877" class="blob-code blob-code-inner js-file-line">	bbr-&gt;idle_restart = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L878" class="blob-num js-line-number" data-line-number="878"></td>
        <td id="LC878" class="blob-code blob-code-inner js-file-line">	bbr-&gt;full_bw = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L879" class="blob-num js-line-number" data-line-number="879"></td>
        <td id="LC879" class="blob-code blob-code-inner js-file-line">	bbr-&gt;full_bw_cnt = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L880" class="blob-num js-line-number" data-line-number="880"></td>
        <td id="LC880" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cycle_mstamp.<span class="pl-smi">v64</span> = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L881" class="blob-num js-line-number" data-line-number="881"></td>
        <td id="LC881" class="blob-code blob-code-inner js-file-line">	bbr-&gt;cycle_idx = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L882" class="blob-num js-line-number" data-line-number="882"></td>
        <td id="LC882" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_reset_lt_bw_sampling</span>(sk);</td>
      </tr>
      <tr>
        <td id="L883" class="blob-num js-line-number" data-line-number="883"></td>
        <td id="LC883" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_reset_startup_mode</span>(sk);</td>
      </tr>
      <tr>
        <td id="L884" class="blob-num js-line-number" data-line-number="884"></td>
        <td id="LC884" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L885" class="blob-num js-line-number" data-line-number="885"></td>
        <td id="LC885" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L886" class="blob-num js-line-number" data-line-number="886"></td>
        <td id="LC886" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_sndbuf_expand</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L887" class="blob-num js-line-number" data-line-number="887"></td>
        <td id="LC887" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L888" class="blob-num js-line-number" data-line-number="888"></td>
        <td id="LC888" class="blob-code blob-code-inner js-file-line">	<span class="pl-c"><span class="pl-c">/*</span> Provision 3 * cwnd since BBR may slow-start even during recovery. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L889" class="blob-num js-line-number" data-line-number="889"></td>
        <td id="LC889" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">3</span>;</td>
      </tr>
      <tr>
        <td id="L890" class="blob-num js-line-number" data-line-number="890"></td>
        <td id="LC890" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L891" class="blob-num js-line-number" data-line-number="891"></td>
        <td id="LC891" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L892" class="blob-num js-line-number" data-line-number="892"></td>
        <td id="LC892" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> In theory BBR does not need to undo the cwnd since it does not</span></td>
      </tr>
      <tr>
        <td id="L893" class="blob-num js-line-number" data-line-number="893"></td>
        <td id="LC893" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> * always reduce cwnd on losses (see bbr_main()). Keep it for now.</span></td>
      </tr>
      <tr>
        <td id="L894" class="blob-num js-line-number" data-line-number="894"></td>
        <td id="LC894" class="blob-code blob-code-inner js-file-line"><span class="pl-c"> <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L895" class="blob-num js-line-number" data-line-number="895"></td>
        <td id="LC895" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_undo_cwnd</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L896" class="blob-num js-line-number" data-line-number="896"></td>
        <td id="LC896" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L897" class="blob-num js-line-number" data-line-number="897"></td>
        <td id="LC897" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">tcp_sk</span>(sk)-&gt;snd_cwnd;</td>
      </tr>
      <tr>
        <td id="L898" class="blob-num js-line-number" data-line-number="898"></td>
        <td id="LC898" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L899" class="blob-num js-line-number" data-line-number="899"></td>
        <td id="LC899" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L900" class="blob-num js-line-number" data-line-number="900"></td>
        <td id="LC900" class="blob-code blob-code-inner js-file-line"><span class="pl-c"><span class="pl-c">/*</span> Entering loss recovery, so save cwnd for when we exit or undo recovery. <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L901" class="blob-num js-line-number" data-line-number="901"></td>
        <td id="LC901" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> u32 <span class="pl-en">bbr_ssthresh</span>(<span class="pl-k">struct</span> sock *sk)</td>
      </tr>
      <tr>
        <td id="L902" class="blob-num js-line-number" data-line-number="902"></td>
        <td id="LC902" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L903" class="blob-num js-line-number" data-line-number="903"></td>
        <td id="LC903" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">bbr_save_cwnd</span>(sk);</td>
      </tr>
      <tr>
        <td id="L904" class="blob-num js-line-number" data-line-number="904"></td>
        <td id="LC904" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> TCP_INFINITE_SSTHRESH;	 <span class="pl-c"><span class="pl-c">/*</span> BBR does not use ssthresh <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L905" class="blob-num js-line-number" data-line-number="905"></td>
        <td id="LC905" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L906" class="blob-num js-line-number" data-line-number="906"></td>
        <td id="LC906" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L907" class="blob-num js-line-number" data-line-number="907"></td>
        <td id="LC907" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-c1">size_t</span> <span class="pl-en">bbr_get_info</span>(<span class="pl-k">struct</span> sock *sk, u32 ext, <span class="pl-k">int</span> *attr, <span class="pl-k">union</span> tcp_cc_info *info)</td>
      </tr>
      <tr>
        <td id="L908" class="blob-num js-line-number" data-line-number="908"></td>
        <td id="LC908" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L909" class="blob-num js-line-number" data-line-number="909"></td>
        <td id="LC909" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (ext &amp; (<span class="pl-c1">1</span> &lt;&lt; (INET_DIAG_BBRINFO - <span class="pl-c1">1</span>)) ||</td>
      </tr>
      <tr>
        <td id="L910" class="blob-num js-line-number" data-line-number="910"></td>
        <td id="LC910" class="blob-code blob-code-inner js-file-line">	    ext &amp; (<span class="pl-c1">1</span> &lt;&lt; (INET_DIAG_VEGASINFO - <span class="pl-c1">1</span>))) {</td>
      </tr>
      <tr>
        <td id="L911" class="blob-num js-line-number" data-line-number="911"></td>
        <td id="LC911" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">struct</span> tcp_sock *tp = <span class="pl-c1">tcp_sk</span>(sk);</td>
      </tr>
      <tr>
        <td id="L912" class="blob-num js-line-number" data-line-number="912"></td>
        <td id="LC912" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L913" class="blob-num js-line-number" data-line-number="913"></td>
        <td id="LC913" class="blob-code blob-code-inner js-file-line">		u64 bw = <span class="pl-c1">bbr_bw</span>(sk);</td>
      </tr>
      <tr>
        <td id="L914" class="blob-num js-line-number" data-line-number="914"></td>
        <td id="LC914" class="blob-code blob-code-inner js-file-line">		bw = bw * tp-&gt;mss_cache * USEC_PER_SEC &gt;&gt; BW_SCALE;</td>
      </tr>
      <tr>
        <td id="L915" class="blob-num js-line-number" data-line-number="915"></td>
        <td id="LC915" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">memset</span>(&amp;info-&gt;bbr, <span class="pl-c1">0</span>, <span class="pl-k">sizeof</span>(info-&gt;bbr));</td>
      </tr>
      <tr>
        <td id="L916" class="blob-num js-line-number" data-line-number="916"></td>
        <td id="LC916" class="blob-code blob-code-inner js-file-line">		info-&gt;bbr.<span class="pl-smi">bbr_bw_lo</span>		= (u32)bw;</td>
      </tr>
      <tr>
        <td id="L917" class="blob-num js-line-number" data-line-number="917"></td>
        <td id="LC917" class="blob-code blob-code-inner js-file-line">		info-&gt;bbr.<span class="pl-smi">bbr_bw_hi</span>		= (u32)(bw &gt;&gt; <span class="pl-c1">32</span>);</td>
      </tr>
      <tr>
        <td id="L918" class="blob-num js-line-number" data-line-number="918"></td>
        <td id="LC918" class="blob-code blob-code-inner js-file-line">		info-&gt;bbr.<span class="pl-smi">bbr_min_rtt</span>		= bbr-&gt;min_rtt_us;</td>
      </tr>
      <tr>
        <td id="L919" class="blob-num js-line-number" data-line-number="919"></td>
        <td id="LC919" class="blob-code blob-code-inner js-file-line">		info-&gt;bbr.<span class="pl-smi">bbr_pacing_gain</span>	= bbr-&gt;pacing_gain;</td>
      </tr>
      <tr>
        <td id="L920" class="blob-num js-line-number" data-line-number="920"></td>
        <td id="LC920" class="blob-code blob-code-inner js-file-line">		info-&gt;bbr.<span class="pl-smi">bbr_cwnd_gain</span>		= bbr-&gt;cwnd_gain;</td>
      </tr>
      <tr>
        <td id="L921" class="blob-num js-line-number" data-line-number="921"></td>
        <td id="LC921" class="blob-code blob-code-inner js-file-line">		*attr = INET_DIAG_BBRINFO;</td>
      </tr>
      <tr>
        <td id="L922" class="blob-num js-line-number" data-line-number="922"></td>
        <td id="LC922" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">return</span> <span class="pl-k">sizeof</span>(info-&gt;bbr);</td>
      </tr>
      <tr>
        <td id="L923" class="blob-num js-line-number" data-line-number="923"></td>
        <td id="LC923" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L924" class="blob-num js-line-number" data-line-number="924"></td>
        <td id="LC924" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L925" class="blob-num js-line-number" data-line-number="925"></td>
        <td id="LC925" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L926" class="blob-num js-line-number" data-line-number="926"></td>
        <td id="LC926" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L927" class="blob-num js-line-number" data-line-number="927"></td>
        <td id="LC927" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> <span class="pl-en">bbr_set_state</span>(<span class="pl-k">struct</span> sock *sk, u8 new_state)</td>
      </tr>
      <tr>
        <td id="L928" class="blob-num js-line-number" data-line-number="928"></td>
        <td id="LC928" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L929" class="blob-num js-line-number" data-line-number="929"></td>
        <td id="LC929" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">struct</span> bbr *bbr = <span class="pl-c1">inet_csk_ca</span>(sk);</td>
      </tr>
      <tr>
        <td id="L930" class="blob-num js-line-number" data-line-number="930"></td>
        <td id="LC930" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L931" class="blob-num js-line-number" data-line-number="931"></td>
        <td id="LC931" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">if</span> (new_state == TCP_CA_Loss) {</td>
      </tr>
      <tr>
        <td id="L932" class="blob-num js-line-number" data-line-number="932"></td>
        <td id="LC932" class="blob-code blob-code-inner js-file-line">		<span class="pl-k">struct</span> rate_sample rs = { .<span class="pl-smi">losses</span> = <span class="pl-c1">1</span> };</td>
      </tr>
      <tr>
        <td id="L933" class="blob-num js-line-number" data-line-number="933"></td>
        <td id="LC933" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L934" class="blob-num js-line-number" data-line-number="934"></td>
        <td id="LC934" class="blob-code blob-code-inner js-file-line">		bbr-&gt;prev_ca_state = TCP_CA_Loss;</td>
      </tr>
      <tr>
        <td id="L935" class="blob-num js-line-number" data-line-number="935"></td>
        <td id="LC935" class="blob-code blob-code-inner js-file-line">		bbr-&gt;full_bw = <span class="pl-c1">0</span>;</td>
      </tr>
      <tr>
        <td id="L936" class="blob-num js-line-number" data-line-number="936"></td>
        <td id="LC936" class="blob-code blob-code-inner js-file-line">		bbr-&gt;round_start = <span class="pl-c1">1</span>;	<span class="pl-c"><span class="pl-c">/*</span> treat RTO like end of a round <span class="pl-c">*/</span></span></td>
      </tr>
      <tr>
        <td id="L937" class="blob-num js-line-number" data-line-number="937"></td>
        <td id="LC937" class="blob-code blob-code-inner js-file-line">		<span class="pl-c1">bbr_lt_bw_sampling</span>(sk, &amp;rs);</td>
      </tr>
      <tr>
        <td id="L938" class="blob-num js-line-number" data-line-number="938"></td>
        <td id="LC938" class="blob-code blob-code-inner js-file-line">	}</td>
      </tr>
      <tr>
        <td id="L939" class="blob-num js-line-number" data-line-number="939"></td>
        <td id="LC939" class="blob-code blob-code-inner js-file-line">}</td>
      </tr>
      <tr>
        <td id="L940" class="blob-num js-line-number" data-line-number="940"></td>
        <td id="LC940" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L941" class="blob-num js-line-number" data-line-number="941"></td>
        <td id="LC941" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">struct</span> tcp_congestion_ops tcp_bbr_cong_ops __read_mostly = {</td>
      </tr>
      <tr>
        <td id="L942" class="blob-num js-line-number" data-line-number="942"></td>
        <td id="LC942" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">flags</span>			= TCP_CONG_NON_RESTRICTED,</td>
      </tr>
      <tr>
        <td id="L943" class="blob-num js-line-number" data-line-number="943"></td>
        <td id="LC943" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">name</span>			= <span class="pl-s"><span class="pl-pds">&quot;</span>nanqinlang<span class="pl-pds">&quot;</span></span>,</td>
      </tr>
      <tr>
        <td id="L944" class="blob-num js-line-number" data-line-number="944"></td>
        <td id="LC944" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">owner</span>			= THIS_MODULE,</td>
      </tr>
      <tr>
        <td id="L945" class="blob-num js-line-number" data-line-number="945"></td>
        <td id="LC945" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">init</span>			= bbr_init,</td>
      </tr>
      <tr>
        <td id="L946" class="blob-num js-line-number" data-line-number="946"></td>
        <td id="LC946" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">cong_control</span>	= bbr_main,</td>
      </tr>
      <tr>
        <td id="L947" class="blob-num js-line-number" data-line-number="947"></td>
        <td id="LC947" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">sndbuf_expand</span>	= bbr_sndbuf_expand,</td>
      </tr>
      <tr>
        <td id="L948" class="blob-num js-line-number" data-line-number="948"></td>
        <td id="LC948" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">undo_cwnd</span>		= bbr_undo_cwnd,</td>
      </tr>
      <tr>
        <td id="L949" class="blob-num js-line-number" data-line-number="949"></td>
        <td id="LC949" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">cwnd_event</span>		= bbr_cwnd_event,</td>
      </tr>
      <tr>
        <td id="L950" class="blob-num js-line-number" data-line-number="950"></td>
        <td id="LC950" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">ssthresh</span>		= bbr_ssthresh,</td>
      </tr>
      <tr>
        <td id="L951" class="blob-num js-line-number" data-line-number="951"></td>
        <td id="LC951" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">tso_segs_goal</span>	= bbr_tso_segs_goal,</td>
      </tr>
      <tr>
        <td id="L952" class="blob-num js-line-number" data-line-number="952"></td>
        <td id="LC952" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">get_info</span>		= bbr_get_info,</td>
      </tr>
      <tr>
        <td id="L953" class="blob-num js-line-number" data-line-number="953"></td>
        <td id="LC953" class="blob-code blob-code-inner js-file-line">	.<span class="pl-smi">set_state</span>		= bbr_set_state,</td>
      </tr>
      <tr>
        <td id="L954" class="blob-num js-line-number" data-line-number="954"></td>
        <td id="LC954" class="blob-code blob-code-inner js-file-line">};</td>
      </tr>
      <tr>
        <td id="L955" class="blob-num js-line-number" data-line-number="955"></td>
        <td id="LC955" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L956" class="blob-num js-line-number" data-line-number="956"></td>
        <td id="LC956" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">int</span> __init <span class="pl-en">bbr_register</span>(<span class="pl-k">void</span>)</td>
      </tr>
      <tr>
        <td id="L957" class="blob-num js-line-number" data-line-number="957"></td>
        <td id="LC957" class="blob-code blob-code-inner js-file-line">{</td>
      </tr>
      <tr>
        <td id="L958" class="blob-num js-line-number" data-line-number="958"></td>
        <td id="LC958" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">BUILD_BUG_ON</span>(<span class="pl-k">sizeof</span>(<span class="pl-k">struct</span> bbr) &gt; ICSK_CA_PRIV_SIZE);</td>
      </tr>
      <tr>
        <td id="L959" class="blob-num js-line-number" data-line-number="959"></td>
        <td id="LC959" class="blob-code blob-code-inner js-file-line">	<span class="pl-k">return</span> <span class="pl-c1">tcp_register_congestion_control</span>(&amp;tcp_bbr_cong_ops);</td>
      </tr>
      <tr>
        <td id="L960" class="blob-num js-line-number" data-line-number="960"></td>
        <td id="LC960" class="blob-code blob-code-inner js-file-line">}</td>
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      <tr>
        <td id="L961" class="blob-num js-line-number" data-line-number="961"></td>
        <td id="LC961" class="blob-code blob-code-inner js-file-line">
</td>
      </tr>
      <tr>
        <td id="L962" class="blob-num js-line-number" data-line-number="962"></td>
        <td id="LC962" class="blob-code blob-code-inner js-file-line"><span class="pl-k">static</span> <span class="pl-k">void</span> __exit <span class="pl-en">bbr_unregister</span>(<span class="pl-k">void</span>)</td>
      </tr>
      <tr>
        <td id="L963" class="blob-num js-line-number" data-line-number="963"></td>
        <td id="LC963" class="blob-code blob-code-inner js-file-line">{</td>
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      <tr>
        <td id="L964" class="blob-num js-line-number" data-line-number="964"></td>
        <td id="LC964" class="blob-code blob-code-inner js-file-line">	<span class="pl-c1">tcp_unregister_congestion_control</span>(&amp;tcp_bbr_cong_ops);</td>
      </tr>
      <tr>
        <td id="L965" class="blob-num js-line-number" data-line-number="965"></td>
        <td id="LC965" class="blob-code blob-code-inner js-file-line">}</td>
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        <td id="L966" class="blob-num js-line-number" data-line-number="966"></td>
        <td id="LC966" class="blob-code blob-code-inner js-file-line">
</td>
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        <td id="L967" class="blob-num js-line-number" data-line-number="967"></td>
        <td id="LC967" class="blob-code blob-code-inner js-file-line"><span class="pl-en">module_init</span>(bbr_register);</td>
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        <td id="L968" class="blob-num js-line-number" data-line-number="968"></td>
        <td id="LC968" class="blob-code blob-code-inner js-file-line"><span class="pl-en">module_exit</span>(bbr_unregister);</td>
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      <tr>
        <td id="L969" class="blob-num js-line-number" data-line-number="969"></td>
        <td id="LC969" class="blob-code blob-code-inner js-file-line">
</td>
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        <td id="L970" class="blob-num js-line-number" data-line-number="970"></td>
        <td id="LC970" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_AUTHOR</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Van Jacobson &lt;[email protected]&gt;<span class="pl-pds">&quot;</span></span>);</td>
      </tr>
      <tr>
        <td id="L971" class="blob-num js-line-number" data-line-number="971"></td>
        <td id="LC971" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_AUTHOR</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Neal Cardwell &lt;[email protected]&gt;<span class="pl-pds">&quot;</span></span>);</td>
      </tr>
      <tr>
        <td id="L972" class="blob-num js-line-number" data-line-number="972"></td>
        <td id="LC972" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_AUTHOR</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Yuchung Cheng &lt;[email protected]&gt;<span class="pl-pds">&quot;</span></span>);</td>
      </tr>
      <tr>
        <td id="L973" class="blob-num js-line-number" data-line-number="973"></td>
        <td id="LC973" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_AUTHOR</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Soheil Hassas Yeganeh &lt;[email protected]&gt;<span class="pl-pds">&quot;</span></span>);</td>
      </tr>
      <tr>
        <td id="L974" class="blob-num js-line-number" data-line-number="974"></td>
        <td id="LC974" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_LICENSE</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Dual BSD/GPL<span class="pl-pds">&quot;</span></span>);</td>
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      <tr>
        <td id="L975" class="blob-num js-line-number" data-line-number="975"></td>
        <td id="LC975" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_DESCRIPTION</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>TCP BBR (Bottleneck Bandwidth and RTT)<span class="pl-pds">&quot;</span></span>);</td>
      </tr>
      <tr>
        <td id="L976" class="blob-num js-line-number" data-line-number="976"></td>
        <td id="LC976" class="blob-code blob-code-inner js-file-line"><span class="pl-en">MODULE_AUTHOR</span>(<span class="pl-s"><span class="pl-pds">&quot;</span>Nanqinlang &lt;https://sometimesnaive.org&gt;<span class="pl-pds">&quot;</span></span>);</td>
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