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| 1 // Copyright (c) 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 // Implements Proportional Rate Reduction (PRR) per RFC 6937. | |
| 6 | |
| 7 #ifndef NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_ | |
| 8 #define NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_ | |
| 9 | |
| 10 #include "net/quic/quic_bandwidth.h" | |
| 11 #include "net/quic/quic_time.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 class NET_EXPORT_PRIVATE PrrSender { | |
| 16 public: | |
| 17 PrrSender(); | |
| 18 // OnPacketLost should be called on the first loss that triggers a recovery | |
| 19 // period and all other methods in this class should only be called when in | |
| 20 // recovery. | |
| 21 void OnPacketLost(QuicByteCount bytes_in_flight); | |
| 22 void OnPacketSent(QuicByteCount sent_bytes); | |
| 23 void OnPacketAcked(QuicByteCount acked_bytes); | |
| 24 QuicTime::Delta TimeUntilSend(QuicByteCount congestion_window, | |
| 25 QuicByteCount bytes_in_flight, | |
| 26 QuicPacketCount slowstart_threshold) | |
| 27 const; | |
| 28 | |
| 29 private: | |
| 30 // Bytes sent and acked since the last loss event. | |
| 31 // |bytes_sent_since_loss_| is the same as "prr_out_" in RFC 6937, | |
| 32 // and |bytes_delivered_since_loss_| is the same as "prr_delivered_". | |
| 33 QuicByteCount bytes_sent_since_loss_; | |
| 34 QuicByteCount bytes_delivered_since_loss_; | |
| 35 size_t ack_count_since_loss_; | |
| 36 | |
| 37 // The congestion window before the last loss event. | |
| 38 QuicByteCount bytes_in_flight_before_loss_; | |
| 39 }; | |
| 40 | |
| 41 } // namespace net | |
| 42 | |
| 43 #endif // NET_QUIC_CONGESTION_CONTROL_PRR_SENDER_H_ | |
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