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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // TCP cubic send side congestion algorithm, emulates the behavior of TCP cubic. | |
6 | |
7 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_BYTES_H_ | |
8 #define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_BYTES_H_ | |
9 | |
10 #include <stdint.h> | |
11 | |
12 #include "base/macros.h" | |
13 #include "net/base/net_export.h" | |
14 #include "net/quic/congestion_control/cubic_bytes.h" | |
15 #include "net/quic/congestion_control/hybrid_slow_start.h" | |
16 #include "net/quic/congestion_control/prr_sender.h" | |
17 #include "net/quic/congestion_control/tcp_cubic_sender_base.h" | |
18 #include "net/quic/quic_bandwidth.h" | |
19 #include "net/quic/quic_connection_stats.h" | |
20 #include "net/quic/quic_protocol.h" | |
21 #include "net/quic/quic_time.h" | |
22 | |
23 namespace net { | |
24 | |
25 class RttStats; | |
26 | |
27 namespace test { | |
28 class TcpCubicSenderBytesPeer; | |
29 } // namespace test | |
30 | |
31 class NET_EXPORT_PRIVATE TcpCubicSenderBytes : public TcpCubicSenderBase { | |
32 public: | |
33 TcpCubicSenderBytes(const QuicClock* clock, | |
34 const RttStats* rtt_stats, | |
35 bool reno, | |
36 QuicPacketCount initial_tcp_congestion_window, | |
37 QuicPacketCount max_congestion_window, | |
38 QuicConnectionStats* stats); | |
39 ~TcpCubicSenderBytes() override; | |
40 | |
41 // Start implementation of SendAlgorithmInterface. | |
42 void SetNumEmulatedConnections(int num_connections) override; | |
43 void OnConnectionMigration() override; | |
44 QuicByteCount GetCongestionWindow() const override; | |
45 QuicByteCount GetSlowStartThreshold() const override; | |
46 CongestionControlType GetCongestionControlType() const override; | |
47 // End implementation of SendAlgorithmInterface. | |
48 | |
49 QuicByteCount min_congestion_window() const { return min_congestion_window_; } | |
50 | |
51 protected: | |
52 // TcpCubicSenderBase methods | |
53 void SetCongestionWindowFromBandwidthAndRtt(QuicBandwidth bandwidth, | |
54 QuicTime::Delta rtt) override; | |
55 void SetCongestionWindowInPackets(QuicPacketCount congestion_window) override; | |
56 void SetMinCongestionWindowInPackets( | |
57 QuicPacketCount congestion_window) override; | |
58 void ExitSlowstart() override; | |
59 void OnPacketLost(QuicPacketNumber largest_loss, | |
60 QuicByteCount lost_bytes, | |
61 QuicByteCount bytes_in_flight) override; | |
62 void MaybeIncreaseCwnd(QuicPacketNumber acked_packet_number, | |
63 QuicByteCount acked_bytes, | |
64 QuicByteCount bytes_in_flight) override; | |
65 void HandleRetransmissionTimeout() override; | |
66 | |
67 private: | |
68 friend class test::TcpCubicSenderBytesPeer; | |
69 | |
70 CubicBytes cubic_; | |
71 | |
72 // ACK counter for the Reno implementation. | |
73 uint64_t num_acked_packets_; | |
74 | |
75 // Congestion window in bytes. | |
76 QuicByteCount congestion_window_; | |
77 | |
78 // Minimum congestion window in bytes. | |
79 QuicByteCount min_congestion_window_; | |
80 | |
81 // Maximum congestion window in bytes. | |
82 QuicByteCount max_congestion_window_; | |
83 | |
84 // Slow start congestion window in bytes, aka ssthresh. | |
85 QuicByteCount slowstart_threshold_; | |
86 | |
87 // Initial TCP congestion window in bytes. This variable can only be set when | |
88 // this algorithm is created. | |
89 const QuicByteCount initial_tcp_congestion_window_; | |
90 | |
91 // Initial maximum TCP congestion window in bytes. This variable can only be | |
92 // set when this algorithm is created. | |
93 const QuicByteCount initial_max_tcp_congestion_window_; | |
94 | |
95 // The minimum window when exiting slow start with large reduction. | |
96 QuicByteCount min_slow_start_exit_window_; | |
97 | |
98 DISALLOW_COPY_AND_ASSIGN(TcpCubicSenderBytes); | |
99 }; | |
100 | |
101 } // namespace net | |
102 | |
103 #endif // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_BYTES_SENDER_H_ | |
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