Move shared files in net/quic/ into net/quic/core/

net/quic/congestion_control/tcp_cubic_sender_base.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_BASE_H_
-#define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_BASE_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;
-
-// Maximum window to allow when doing bandwidth resumption.
-const QuicPacketCount kMaxResumptionCongestionWindow = 200;
-
-namespace test {
-class TcpCubicSenderBasePeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE TcpCubicSenderBase : public SendAlgorithmInterface {
- public:
-  // Reno option and max_tcp_congestion_window are provided for testing.
-  TcpCubicSenderBase(const QuicClock* clock,
-                     const RttStats* rtt_stats,
-                     bool reno,
-                     QuicConnectionStats* stats);
-  ~TcpCubicSenderBase() 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 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) const override;
-  QuicBandwidth PacingRate(QuicByteCount bytes_in_flight) const override;
-  QuicBandwidth BandwidthEstimate() const override;
-  QuicTime::Delta RetransmissionDelay() const override;
-  bool InSlowStart() const override;
-  bool InRecovery() const override;
-
- protected:
-  // Called when resuming a previous bandwidth.
-  virtual void SetCongestionWindowFromBandwidthAndRtt(QuicBandwidth bandwidth,
-                                                      QuicTime::Delta rtt) = 0;
-
-  // Called when initializing the congestion window.
-  virtual void SetCongestionWindowInPackets(
-      QuicPacketCount congestion_window) = 0;
-
-  // Called when initializing the minimum congestion window.
-  virtual void SetMinCongestionWindowInPackets(
-      QuicPacketCount congestion_window) = 0;
-
-  // Called when slow start is exited to set SSTHRESH.
-  virtual void ExitSlowstart() = 0;
-
-  // Called when a packet is lost.
-  virtual void OnPacketLost(QuicPacketNumber largest_loss,
-                            QuicByteCount lost_bytes,
-                            QuicByteCount bytes_in_flight) = 0;
-
-  // Called when a packet has been acked to possibly increase the congestion
-  // window.
-  virtual void MaybeIncreaseCwnd(QuicPacketNumber acked_packet_number,
-                                 QuicByteCount acked_bytes,
-                                 QuicByteCount bytes_in_flight) = 0;
-
-  // Called when a retransmission has occured which resulted in packets
-  // being retransmitted.
-  virtual void HandleRetransmissionTimeout() = 0;
-
-  // Compute the TCP Reno beta based on the current number of connections.
-  float RenoBeta() const;
-
-  bool IsCwndLimited(QuicByteCount bytes_in_flight) const;
-
- private:
-  friend class test::TcpCubicSenderBasePeer;
-
-  // TODO(ianswett): Remove these and migrate to OnCongestionEvent.
-  void OnPacketAcked(QuicPacketNumber acked_packet_number,
-                     QuicByteCount acked_bytes,
-                     QuicByteCount bytes_in_flight);
-
- protected:
-  // TODO(rch): Make these private and clean up subclass access to them.
-  HybridSlowStart hybrid_slow_start_;
-  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_;
-
-  // 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_;
-
-  // Whether to use 4 packets as the actual min, but pace lower.
-  bool min4_mode_;
-
-  // Whether the last loss event caused us to exit slowstart.
-  // Used for stats collection of slowstart_packets_lost
-  bool last_cutback_exited_slowstart_;
-
-  // When true, exit slow start with large cutback of congestion window.
-  bool slow_start_large_reduction_;
-
-  // When true, use rate based sending instead of only sending if there's CWND.
-  bool rate_based_sending_;
-
-  // When true, use unity pacing instead of PRR.
-  bool no_prr_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TcpCubicSenderBase);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_BASE_H_