chromium/net/third_party/quiche/src/quiche/quic/core/congestion_control/bbr_sender.h

// Copyright 2016 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.

// BBR (Bottleneck Bandwidth and RTT) congestion control algorithm.

#ifndef QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_
#define QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_

#include <cstdint>
#include <ostream>
#include <string>

#include "quiche/quic/core/congestion_control/bandwidth_sampler.h"
#include "quiche/quic/core/congestion_control/send_algorithm_interface.h"
#include "quiche/quic/core/congestion_control/windowed_filter.h"
#include "quiche/quic/core/crypto/quic_random.h"
#include "quiche/quic/core/quic_bandwidth.h"
#include "quiche/quic/core/quic_packet_number.h"
#include "quiche/quic/core/quic_packets.h"
#include "quiche/quic/core/quic_time.h"
#include "quiche/quic/core/quic_unacked_packet_map.h"
#include "quiche/quic/platform/api/quic_export.h"
#include "quiche/quic/platform/api/quic_flags.h"

namespace quic {

class RttStats;

// BbrSender implements BBR congestion control algorithm.  BBR aims to estimate
// the current available Bottleneck Bandwidth and RTT (hence the name), and
// regulates the pacing rate and the size of the congestion window based on
// those signals.
//
// BBR relies on pacing in order to function properly.  Do not use BBR when
// pacing is disabled.
//
// TODO(vasilvv): implement traffic policer (long-term sampling) mode.
class QUICHE_EXPORT BbrSender : public SendAlgorithmInterface { … };

QUICHE_EXPORT std::ostream& operator<<(std::ostream& os,
                                       const BbrSender::Mode& mode);
QUICHE_EXPORT std::ostream& operator<<(std::ostream& os,
                                       const BbrSender::DebugState& state);

}  // namespace quic

#endif  // QUICHE_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_