OLD | NEW |
| (Empty) |
1 // Copyright 2014 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 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_ | |
6 #define NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_ | |
7 | |
8 #include <algorithm> | |
9 #include <map> | |
10 | |
11 #include "base/macros.h" | |
12 #include "net/quic/congestion_control/loss_detection_interface.h" | |
13 #include "net/quic/quic_protocol.h" | |
14 #include "net/quic/quic_time.h" | |
15 #include "net/quic/quic_unacked_packet_map.h" | |
16 | |
17 namespace net { | |
18 | |
19 // Class which implement's TCP's approach of detecting loss when 3 nacks have | |
20 // been received for a packet. Also implements TCP's early retransmit(RFC5827). | |
21 class NET_EXPORT_PRIVATE TCPLossAlgorithm : public LossDetectionInterface { | |
22 public: | |
23 // TCP retransmits after 3 nacks. | |
24 static const QuicPacketCount kNumberOfNacksBeforeRetransmission = 3; | |
25 | |
26 TCPLossAlgorithm(); | |
27 ~TCPLossAlgorithm() override {} | |
28 | |
29 LossDetectionType GetLossDetectionType() const override; | |
30 | |
31 // Uses nack counts to decide when packets are lost. | |
32 PacketNumberSet DetectLostPackets(const QuicUnackedPacketMap& unacked_packets, | |
33 const QuicTime& time, | |
34 QuicPacketNumber largest_observed, | |
35 const RttStats& rtt_stats) override; | |
36 // Unsupported. | |
37 void DetectLosses( | |
38 const QuicUnackedPacketMap& unacked_packets, | |
39 const QuicTime& time, | |
40 const RttStats& rtt_stats, | |
41 SendAlgorithmInterface::CongestionVector* packets_lost) override; | |
42 | |
43 // Returns a non-zero value when the early retransmit timer is active. | |
44 QuicTime GetLossTimeout() const override; | |
45 | |
46 private: | |
47 QuicTime loss_detection_timeout_; | |
48 | |
49 DISALLOW_COPY_AND_ASSIGN(TCPLossAlgorithm); | |
50 }; | |
51 | |
52 } // namespace net | |
53 | |
54 #endif // NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_ | |
OLD | NEW |