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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_probe_rtt.h"
#include "quic/core/congestion_control/bbr2_sender.h"
#include "quic/core/quic_time.h"
#include "quic/platform/api/quic_logging.h"
namespace quic {
void Bbr2ProbeRttMode::Enter(QuicTime /*now*/,
const Bbr2CongestionEvent* /*congestion_event*/) {
model_->set_pacing_gain(1.0);
model_->set_cwnd_gain(1.0);
exit_time_ = QuicTime::Zero();
}
Bbr2Mode Bbr2ProbeRttMode::OnCongestionEvent(
QuicByteCount /*prior_in_flight*/,
QuicTime /*event_time*/,
const AckedPacketVector& /*acked_packets*/,
const LostPacketVector& /*lost_packets*/,
const Bbr2CongestionEvent& congestion_event) {
if (exit_time_ == QuicTime::Zero()) {
if (congestion_event.bytes_in_flight <= InflightTarget() ||
congestion_event.bytes_in_flight <=
sender_->GetMinimumCongestionWindow()) {
exit_time_ = congestion_event.event_time + Params().probe_rtt_duration;
QUIC_DVLOG(2) << sender_ << " PROBE_RTT exit time set to " << exit_time_
<< ". bytes_inflight:" << congestion_event.bytes_in_flight
<< ", inflight_target:" << InflightTarget()
<< ", min_congestion_window:"
<< sender_->GetMinimumCongestionWindow() << " @ "
<< congestion_event.event_time;
}
return Bbr2Mode::PROBE_RTT;
}
return congestion_event.event_time > exit_time_ ? Bbr2Mode::PROBE_BW
: Bbr2Mode::PROBE_RTT;
}
QuicByteCount Bbr2ProbeRttMode::InflightTarget() const {
return model_->BDP(model_->MaxBandwidth(),
Params().probe_rtt_inflight_target_bdp_fraction);
}
Limits<QuicByteCount> Bbr2ProbeRttMode::GetCwndLimits() const {
QuicByteCount inflight_upper_bound =
std::min(model_->inflight_lo(), model_->inflight_hi_with_headroom());
return NoGreaterThan(std::min(inflight_upper_bound, InflightTarget()));
}
Bbr2Mode Bbr2ProbeRttMode::OnExitQuiescence(
QuicTime now,
QuicTime /*quiescence_start_time*/) {
if (now > exit_time_) {
return Bbr2Mode::PROBE_BW;
}
return Bbr2Mode::PROBE_RTT;
}
Bbr2ProbeRttMode::DebugState Bbr2ProbeRttMode::ExportDebugState() const {
DebugState s;
s.inflight_target = InflightTarget();
s.exit_time = exit_time_;
return s;
}
std::ostream& operator<<(std::ostream& os,
const Bbr2ProbeRttMode::DebugState& state) {
os << "[PROBE_RTT] inflight_target: " << state.inflight_target << "\n";
os << "[PROBE_RTT] exit_time: " << state.exit_time << "\n";
return os;
}
const Bbr2Params& Bbr2ProbeRttMode::Params() const {
return sender_->Params();
}
} // namespace quic