Land Recent QUIC Changes until 03/09/2015.

net/quic/congestion_control/cubic_bytes.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2015 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.
-//
+
 // Cubic algorithm, helper class to TCP cubic.
 // For details see http://netsrv.csc.ncsu.edu/export/cubic_a_new_tcp_2008.pdf.
 
-#ifndef NET_QUIC_CONGESTION_CONTROL_CUBIC_H_
-#define NET_QUIC_CONGESTION_CONTROL_CUBIC_H_
+#ifndef NET_QUIC_CONGESTION_CONTROL_CUBIC_BYTES_H_
+#define NET_QUIC_CONGESTION_CONTROL_CUBIC_BYTES_H_
 
 #include "base/basictypes.h"
 #include "net/base/net_export.h"
 #include "net/quic/quic_bandwidth.h"
 #include "net/quic/quic_clock.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
-class NET_EXPORT_PRIVATE Cubic {
+class NET_EXPORT_PRIVATE CubicBytes {
  public:
-  explicit Cubic(const QuicClock* clock);
+  explicit CubicBytes(const QuicClock* clock);
 
   void SetNumConnections(int num_connections);
 
   // Call after a timeout to reset the cubic state.
   void Reset();
 
   // Compute a new congestion window to use after a loss event.
   // Returns the new congestion window in packets. The new congestion window is
   // a multiplicative decrease of our current window.
-  QuicPacketCount CongestionWindowAfterPacketLoss(QuicPacketCount current);
+  QuicByteCount CongestionWindowAfterPacketLoss(QuicPacketCount current);
 
   // Compute a new congestion window to use after a received ACK.
-  // Returns the new congestion window in packets. The new congestion window
-  // follows a cubic function that depends on the time passed since last
-  // packet loss.
-  QuicPacketCount CongestionWindowAfterAck(QuicPacketCount current,
-                                           QuicTime::Delta delay_min);
+  // Returns the new congestion window in bytes. The new congestion window
+  // follows a cubic function that depends on the time passed since last packet
+  // loss.
+  QuicByteCount CongestionWindowAfterAck(QuicByteCount acked_bytes,
+                                         QuicByteCount current,
+                                         QuicTime::Delta delay_min);
 
  private:
   static const QuicTime::Delta MaxCubicTimeInterval() {
     return QuicTime::Delta::FromMilliseconds(30);
   }
 
   // Compute the TCP Cubic alpha and beta based on the current number of
   // connections.
   float Alpha() const;
   float Beta() const;
 
   const QuicClock* clock_;
 
   // Number of connections to simulate.
   int num_connections_;
 
   // Time when this cycle started, after last loss event.
   QuicTime epoch_;
 
   // Time when we updated last_congestion_window.
   QuicTime last_update_time_;
 
-  // Last congestion window (in packets) used.
-  QuicPacketCount last_congestion_window_;
+  // Last congestion window used.
+  QuicByteCount last_congestion_window_;
 
-  // Max congestion window (in packets) used just before last loss event.
+  // Max congestion window used just before last loss event.
   // Note: to improve fairness to other streams an additional back off is
   // applied to this value if the new value is below our latest value.
-  QuicPacketCount last_max_congestion_window_;
+  QuicByteCount last_max_congestion_window_;
 
-  // Number of acked packets since the cycle started (epoch).
-  QuicPacketCount acked_packets_count_;
+  // Number of acked bytes since the cycle started (epoch).
+  QuicByteCount acked_bytes_count_;
 
   // TCP Reno equivalent congestion window in packets.
-  QuicPacketCount estimated_tcp_congestion_window_;
+  QuicByteCount estimated_tcp_congestion_window_;
 
   // Origin point of cubic function.
-  QuicPacketCount origin_point_congestion_window_;
+  QuicByteCount origin_point_congestion_window_;
 
   // Time to origin point of cubic function in 2^10 fractions of a second.
   uint32 time_to_origin_point_;
 
   // Last congestion window in packets computed by cubic function.
-  QuicPacketCount last_target_congestion_window_;
+  QuicByteCount last_target_congestion_window_;
 
-  DISALLOW_COPY_AND_ASSIGN(Cubic);
+  DISALLOW_COPY_AND_ASSIGN(CubicBytes);
 };
 
 }  // namespace net
 
-#endif  // NET_QUIC_CONGESTION_CONTROL_CUBIC_H_
+#endif  // NET_QUIC_CONGESTION_CONTROL_CUBIC_BYTES_H_