Deprecate FLAG_quic_use_new_tcp_sender

net/quic/congestion_control/tcp_cubic_sender.h

-// Copyright (c) 2012 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.
-//
-// TCP cubic send side congestion algorithm, emulates the behavior of TCP cubic.
-
-#ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
-#define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
-
-#include <stdint.h>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/quic/congestion_control/cubic.h"
-#include "net/quic/congestion_control/hybrid_slow_start.h"
-#include "net/quic/congestion_control/prr_sender.h"
-#include "net/quic/congestion_control/send_algorithm_interface.h"
-#include "net/quic/quic_bandwidth.h"
-#include "net/quic/quic_connection_stats.h"
-#include "net/quic/quic_protocol.h"
-#include "net/quic/quic_time.h"
-
-namespace net {
-
-class RttStats;
-
-namespace test {
-class TcpCubicSenderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE TcpCubicSender : public SendAlgorithmInterface {
- public:
-  // Reno option and max_tcp_congestion_window are provided for testing.
-  TcpCubicSender(const QuicClock* clock,
-                 const RttStats* rtt_stats,
-                 bool reno,
-                 QuicPacketCount initial_tcp_congestion_window,
-                 QuicPacketCount max_tcp_congestion_window,
-                 QuicConnectionStats* stats);
-  ~TcpCubicSender() override;
-
-  // Start implementation of SendAlgorithmInterface.
-  void SetFromConfig(const QuicConfig& config,
-                     Perspective perspective) override;
-  void ResumeConnectionState(
-      const CachedNetworkParameters& cached_network_params,
-      bool max_bandwidth_resumption) override;
-  void SetNumEmulatedConnections(int num_connections) override;
-  void SetMaxCongestionWindow(QuicByteCount max_congestion_window) override;
-  void OnCongestionEvent(bool rtt_updated,
-                         QuicByteCount bytes_in_flight,
-                         const CongestionVector& acked_packets,
-                         const CongestionVector& lost_packets) override;
-  bool OnPacketSent(QuicTime sent_time,
-                    QuicByteCount bytes_in_flight,
-                    QuicPacketNumber packet_number,
-                    QuicByteCount bytes,
-                    HasRetransmittableData is_retransmittable) override;
-  void OnRetransmissionTimeout(bool packets_retransmitted) override;
-  void OnConnectionMigration() override;
-  QuicTime::Delta TimeUntilSend(
-      QuicTime now,
-      QuicByteCount bytes_in_flight,
-      HasRetransmittableData has_retransmittable_data) const override;
-  QuicBandwidth PacingRate() const override;
-  QuicBandwidth BandwidthEstimate() const override;
-  QuicTime::Delta RetransmissionDelay() const override;
-  QuicByteCount GetCongestionWindow() const override;
-  bool InSlowStart() const override;
-  bool InRecovery() const override;
-  QuicByteCount GetSlowStartThreshold() const override;
-  CongestionControlType GetCongestionControlType() const override;
-  // End implementation of SendAlgorithmInterface.
-
- private:
-  friend class test::TcpCubicSenderPeer;
-
-  // Compute the TCP Reno beta based on the current number of connections.
-  float RenoBeta() const;
-
-  // TODO(ianswett): Remove these and migrate to OnCongestionEvent.
-  void OnPacketAcked(QuicPacketNumber acked_packet_number,
-                     QuicByteCount acked_bytes,
-                     QuicByteCount bytes_in_flight);
-  void OnPacketLost(QuicPacketNumber largest_loss,
-                    QuicByteCount bytes_in_flight);
-
-  void MaybeIncreaseCwnd(QuicPacketNumber acked_packet_number,
-                         QuicByteCount bytes_in_flight);
-  bool IsCwndLimited(QuicByteCount bytes_in_flight) const;
-
-  HybridSlowStart hybrid_slow_start_;
-  Cubic cubic_;
-  PrrSender prr_;
-  const RttStats* rtt_stats_;
-  QuicConnectionStats* stats_;
-
-  // If true, Reno congestion control is used instead of Cubic.
-  const bool reno_;
-
-  // Number of connections to simulate.
-  uint32_t num_connections_;
-
-  // ACK counter for the Reno implementation.
-  uint64_t congestion_window_count_;
-
-  // Track the largest packet that has been sent.
-  QuicPacketNumber largest_sent_packet_number_;
-
-  // Track the largest packet that has been acked.
-  QuicPacketNumber largest_acked_packet_number_;
-
-  // Track the largest packet number outstanding when a CWND cutback occurs.
-  QuicPacketNumber largest_sent_at_last_cutback_;
-
-  // Congestion window in packets.
-  QuicPacketCount congestion_window_;
-
-  // Minimum congestion window in packets.
-  QuicPacketCount min_congestion_window_;
-
-  // Whether to use 4 packets as the actual min, but pace lower.
-  bool min4_mode_;
-
-  // Slow start congestion window in packets, aka ssthresh.
-  QuicPacketCount slowstart_threshold_;
-
-  // Whether the last loss event caused us to exit slowstart.
-  // Used for stats collection of slowstart_packets_lost
-  bool last_cutback_exited_slowstart_;
-
-  // Maximum number of outstanding packets for tcp.
-  QuicPacketCount max_tcp_congestion_window_;
-
-  // Initial TCP congestion window. This variable can only be set when this
-  // algorithm is created.
-  const QuicPacketCount initial_tcp_congestion_window_;
-
-  // Initial maximum TCP congestion window. This variable can only be set when
-  // this algorithm is created.
-  const QuicPacketCount initial_max_tcp_congestion_window_;
-
-  // When true, exit slow start with large cutback of congestion window.
-  bool slow_start_large_reduction_;
-
-  DISALLOW_COPY_AND_ASSIGN(TcpCubicSender);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_