Move shared files in net/quic/ into net/quic/core/

net/quic/congestion_control/cubic.h

-// Copyright (c) 2012 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_
-
-#include <stdint.h>
-
-#include "base/macros.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 {
- public:
-  explicit Cubic(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);
-
-  // 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);
-
-  // Call on ack arrival when sender is unable to use the available congestion
-  // window. Resets Cubic state during quiescence.
-  void OnApplicationLimited();
-
- 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 sender went into application-limited period. Zero if not in
-  // application-limited period.
-  QuicTime app_limited_start_time_;
-
-  // Time when we updated last_congestion_window.
-  QuicTime last_update_time_;
-
-  // Last congestion window (in packets) used.
-  QuicPacketCount last_congestion_window_;
-
-  // Max congestion window (in packets) 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_;
-
-  // Number of acked packets since the cycle started (epoch).
-  QuicPacketCount acked_packets_count_;
-
-  // TCP Reno equivalent congestion window in packets.
-  QuicPacketCount estimated_tcp_congestion_window_;
-
-  // Origin point of cubic function.
-  QuicPacketCount origin_point_congestion_window_;
-
-  // Time to origin point of cubic function in 2^10 fractions of a second.
-  uint32_t time_to_origin_point_;
-
-  // Last congestion window in packets computed by cubic function.
-  QuicPacketCount last_target_congestion_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(Cubic);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_CUBIC_H_