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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "quic/core/congestion_control/bbr2_drain.h"
#include "quic/core/congestion_control/bbr2_sender.h"
#include "quic/platform/api/quic_logging.h"
namespace quic {
Bbr2Mode Bbr2DrainMode::OnCongestionEvent(
QuicByteCount /*prior_in_flight*/,
QuicTime /*event_time*/,
const AckedPacketVector& /*acked_packets*/,
const LostPacketVector& /*lost_packets*/,
const Bbr2CongestionEvent& congestion_event) {
model_->set_pacing_gain(Params().drain_pacing_gain);
// Only STARTUP can transition to DRAIN, both of them use the same cwnd gain.
DCHECK_EQ(model_->cwnd_gain(), Params().drain_cwnd_gain);
model_->set_cwnd_gain(Params().drain_cwnd_gain);
QuicByteCount drain_target = DrainTarget();
if (congestion_event.bytes_in_flight <= drain_target) {
QUIC_DVLOG(3) << sender_ << " Exiting DRAIN. bytes_in_flight:"
<< congestion_event.bytes_in_flight
<< ", bdp:" << model_->BDP()
<< ", drain_target:" << drain_target << " @ "
<< congestion_event.event_time;
return Bbr2Mode::PROBE_BW;
}
QUIC_DVLOG(3) << sender_ << " Staying in DRAIN. bytes_in_flight:"
<< congestion_event.bytes_in_flight << ", bdp:" << model_->BDP()
<< ", drain_target:" << drain_target << " @ "
<< congestion_event.event_time;
return Bbr2Mode::DRAIN;
}
QuicByteCount Bbr2DrainMode::DrainTarget() const {
QuicByteCount bdp = model_->BDP();
return std::max<QuicByteCount>(bdp, sender_->GetMinimumCongestionWindow());
}
Bbr2DrainMode::DebugState Bbr2DrainMode::ExportDebugState() const {
DebugState s;
s.drain_target = DrainTarget();
return s;
}
std::ostream& operator<<(std::ostream& os,
const Bbr2DrainMode::DebugState& state) {
os << "[DRAIN] drain_target: " << state.drain_target << "\n";
return os;
}
const Bbr2Params& Bbr2DrainMode::Params() const {
return sender_->Params();
}
} // namespace quic