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 QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_ 8 #define QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_ 9 10 #include "quiche/quic/core/quic_bandwidth.h" 11 #include "quiche/quic/core/quic_time.h" 12 #include "quiche/quic/platform/api/quic_export.h" 13 14 namespace quic { 15 16 class QUICHE_EXPORT PrrSender { 17 public: 18 PrrSender(); 19 // OnPacketLost should be called on the first loss that triggers a recovery 20 // period and all other methods in this class should only be called when in 21 // recovery. 22 void OnPacketLost(QuicByteCount prior_in_flight); 23 void OnPacketSent(QuicByteCount sent_bytes); 24 void OnPacketAcked(QuicByteCount acked_bytes); 25 bool CanSend(QuicByteCount congestion_window, QuicByteCount bytes_in_flight, 26 QuicByteCount slowstart_threshold) const; 27 28 private: 29 // Bytes sent and acked since the last loss event. 30 // |bytes_sent_since_loss_| is the same as "prr_out_" in RFC 6937, 31 // and |bytes_delivered_since_loss_| is the same as "prr_delivered_". 32 QuicByteCount bytes_sent_since_loss_; 33 QuicByteCount bytes_delivered_since_loss_; 34 size_t ack_count_since_loss_; 35 36 // The congestion window before the last loss event. 37 QuicByteCount bytes_in_flight_before_loss_; 38 }; 39 40 } // namespace quic 41 42 #endif // QUICHE_QUIC_CORE_CONGESTION_CONTROL_PRR_SENDER_H_ 43