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| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2021, Cloudflare, Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| </span><span class="doccomment">//! Proportional Rate Reduction |
| //! |
| //! This implementation is based on the following RFC: |
| //! |
| //! <https://datatracker.ietf.org/doc/html/rfc6937> |
| |
| </span><span class="kw">use </span>std::cmp; |
| |
| <span class="attr">#[derive(Default, Debug)] |
| </span><span class="kw">pub struct </span>PRR { |
| <span class="comment">// Total bytes delivered during recovery. |
| </span>prr_delivered: usize, |
| |
| <span class="comment">// FlightSize at the start of recovery. |
| </span>recoverfs: usize, |
| |
| <span class="comment">// Total bytes sent during recovery. |
| </span>prr_out: usize, |
| |
| <span class="comment">// Total additional bytes can be sent for retransmit during recovery. |
| </span><span class="kw">pub </span>snd_cnt: usize, |
| } |
| |
| <span class="kw">impl </span>PRR { |
| <span class="kw">pub fn </span>on_packet_sent(<span class="kw-2">&mut </span><span class="self">self</span>, sent_bytes: usize) { |
| <span class="self">self</span>.prr_out += sent_bytes; |
| |
| <span class="self">self</span>.snd_cnt = <span class="self">self</span>.snd_cnt.saturating_sub(sent_bytes); |
| } |
| |
| <span class="kw">pub fn </span>congestion_event(<span class="kw-2">&mut </span><span class="self">self</span>, bytes_in_flight: usize) { |
| <span class="self">self</span>.prr_delivered = <span class="number">0</span>; |
| |
| <span class="self">self</span>.recoverfs = bytes_in_flight; |
| |
| <span class="self">self</span>.prr_out = <span class="number">0</span>; |
| |
| <span class="self">self</span>.snd_cnt = <span class="number">0</span>; |
| } |
| |
| <span class="kw">pub fn </span>on_packet_acked( |
| <span class="kw-2">&mut </span><span class="self">self</span>, delivered_data: usize, pipe: usize, ssthresh: usize, |
| max_datagram_size: usize, |
| ) { |
| <span class="self">self</span>.prr_delivered += delivered_data; |
| |
| <span class="self">self</span>.snd_cnt = <span class="kw">if </span>pipe > ssthresh { |
| <span class="comment">// Proportional Rate Reduction. |
| </span><span class="kw">if </span><span class="self">self</span>.recoverfs > <span class="number">0 </span>{ |
| ((<span class="self">self</span>.prr_delivered * ssthresh + <span class="self">self</span>.recoverfs - <span class="number">1</span>) / |
| <span class="self">self</span>.recoverfs) |
| .saturating_sub(<span class="self">self</span>.prr_out) |
| } <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>} |
| } <span class="kw">else </span>{ |
| <span class="comment">// PRR-SSRB. |
| </span><span class="kw">let </span>limit = cmp::max( |
| <span class="self">self</span>.prr_delivered.saturating_sub(<span class="self">self</span>.prr_out), |
| delivered_data, |
| ) + max_datagram_size; |
| |
| <span class="comment">// Attempt to catch up, as permitted by limit |
| </span>cmp::min(ssthresh - pipe, limit) |
| }; |
| |
| <span class="comment">// snd_cnt should be a positive number. |
| </span><span class="self">self</span>.snd_cnt = cmp::max(<span class="self">self</span>.snd_cnt, <span class="number">0</span>); |
| } |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>congestion_event() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>bytes_in_flight = <span class="number">1000</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| <span class="macro">assert_eq!</span>(prr.recoverfs, bytes_in_flight); |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_sent() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>bytes_in_flight = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_sent = <span class="number">500</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| prr.on_packet_sent(bytes_sent); |
| |
| <span class="macro">assert_eq!</span>(prr.prr_out, bytes_sent); |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_acked_prr() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>max_datagram_size = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_in_flight = max_datagram_size * <span class="number">10</span>; |
| <span class="kw">let </span>ssthresh = bytes_in_flight / <span class="number">2</span>; |
| <span class="kw">let </span>acked = <span class="number">1000</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| <span class="comment">// pipe > ssthresh uses PRR algorithm. |
| </span><span class="kw">let </span>pipe = bytes_in_flight; |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">500</span>); |
| |
| <span class="kw">let </span>snd_cnt = prr.snd_cnt; |
| |
| <span class="comment">// send one more allowed by snd_cnt |
| </span>prr.on_packet_sent(snd_cnt); |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">500</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_acked_prr_overflow() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>max_datagram_size = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_in_flight = max_datagram_size * <span class="number">10</span>; |
| <span class="kw">let </span>ssthresh = bytes_in_flight / <span class="number">2</span>; |
| <span class="kw">let </span>acked = <span class="number">1000</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| prr.on_packet_sent(max_datagram_size); |
| |
| <span class="comment">// pipe > ssthresh uses PRR algorithm. |
| </span><span class="kw">let </span>pipe = bytes_in_flight + max_datagram_size; |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_acked_prr_zero_in_flight() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>max_datagram_size = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_in_flight = <span class="number">0</span>; |
| <span class="kw">let </span>ssthresh = <span class="number">3000</span>; |
| <span class="kw">let </span>acked = <span class="number">1000</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| <span class="comment">// pipe > ssthresh uses PRR algorithm. |
| </span><span class="kw">let </span>pipe = ssthresh + <span class="number">1000</span>; |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_acked_prr_ssrb() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>max_datagram_size = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_in_flight = max_datagram_size * <span class="number">10</span>; |
| <span class="kw">let </span>ssthresh = bytes_in_flight / <span class="number">2</span>; |
| <span class="kw">let </span>acked = <span class="number">1000</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| <span class="comment">// pipe <= ssthresh uses PRR-SSRB algorithm. |
| </span><span class="kw">let </span>pipe = max_datagram_size; |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">2000</span>); |
| |
| <span class="kw">let </span>snd_cnt = prr.snd_cnt; |
| |
| <span class="comment">// send one more allowed by snd_cnt |
| </span>prr.on_packet_sent(snd_cnt); |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">2000</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>on_packet_acked_prr_ssrb_overflow() { |
| <span class="kw">let </span><span class="kw-2">mut </span>prr = PRR::default(); |
| <span class="kw">let </span>max_datagram_size = <span class="number">1000</span>; |
| <span class="kw">let </span>bytes_in_flight = max_datagram_size * <span class="number">10</span>; |
| <span class="kw">let </span>ssthresh = bytes_in_flight / <span class="number">2</span>; |
| <span class="kw">let </span>acked = <span class="number">500</span>; |
| |
| prr.congestion_event(bytes_in_flight); |
| |
| <span class="comment">// pipe <= ssthresh uses PRR-SSRB algorithm. |
| </span><span class="kw">let </span>pipe = max_datagram_size; |
| |
| prr.on_packet_sent(max_datagram_size); |
| |
| prr.on_packet_acked(acked, pipe, ssthresh, max_datagram_size); |
| |
| <span class="macro">assert_eq!</span>(prr.snd_cnt, <span class="number">1500</span>); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
