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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.
#ifndef QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR2_STARTUP_H_
#define QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR2_STARTUP_H_
#include "quic/core/congestion_control/bbr2_misc.h"
#include "quic/core/quic_bandwidth.h"
#include "quic/core/quic_time.h"
#include "quic/core/quic_types.h"
#include "quic/platform/api/quic_export.h"
namespace quic {
class Bbr2Sender;
class QUIC_EXPORT_PRIVATE Bbr2StartupMode final : public Bbr2ModeBase {
public:
Bbr2StartupMode(const Bbr2Sender* sender,
Bbr2NetworkModel* model,
QuicTime now);
void Enter(QuicTime now,
const Bbr2CongestionEvent* congestion_event) override;
void Leave(QuicTime now,
const Bbr2CongestionEvent* congestion_event) override;
Bbr2Mode OnCongestionEvent(
QuicByteCount prior_in_flight,
QuicTime event_time,
const AckedPacketVector& acked_packets,
const LostPacketVector& lost_packets,
const Bbr2CongestionEvent& congestion_event) override;
Limits<QuicByteCount> GetCwndLimits() const override {
// Inflight_lo is never set in STARTUP.
DCHECK_EQ(Bbr2NetworkModel::inflight_lo_default(), model_->inflight_lo());
return NoGreaterThan(model_->inflight_lo());
}
bool IsProbingForBandwidth() const override { return true; }
Bbr2Mode OnExitQuiescence(QuicTime /*now*/,
QuicTime /*quiescence_start_time*/) override {
return Bbr2Mode::STARTUP;
}
struct QUIC_EXPORT_PRIVATE DebugState {
bool full_bandwidth_reached;
QuicBandwidth full_bandwidth_baseline = QuicBandwidth::Zero();
QuicRoundTripCount round_trips_without_bandwidth_growth;
};
DebugState ExportDebugState() const;
private:
const Bbr2Params& Params() const;
void CheckExcessiveLosses(const Bbr2CongestionEvent& congestion_event);
// Used when the pacing gain can decrease in STARTUP.
QuicBandwidth max_bw_at_round_beginning_ = QuicBandwidth::Zero();
};
QUIC_EXPORT_PRIVATE std::ostream& operator<<(
std::ostream& os,
const Bbr2StartupMode::DebugState& state);
} // namespace quic
#endif // QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR2_STARTUP_H_