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

net/quic/congestion_control/prr_sender.cc

-// Copyright (c) 2014 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.
-
-#include "net/quic/congestion_control/prr_sender.h"
-
-#include "net/quic/quic_protocol.h"
-
-namespace net {
-
-namespace {
-// Constant based on TCP defaults.
-const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS;
-}  // namespace
-
-PrrSender::PrrSender()
-    : bytes_sent_since_loss_(0),
-      bytes_delivered_since_loss_(0),
-      ack_count_since_loss_(0),
-      bytes_in_flight_before_loss_(0) {}
-
-void PrrSender::OnPacketSent(QuicByteCount sent_bytes) {
-  bytes_sent_since_loss_ += sent_bytes;
-}
-
-void PrrSender::OnPacketLost(QuicByteCount bytes_in_flight) {
-  bytes_sent_since_loss_ = 0;
-  bytes_in_flight_before_loss_ = bytes_in_flight;
-  bytes_delivered_since_loss_ = 0;
-  ack_count_since_loss_ = 0;
-}
-
-void PrrSender::OnPacketAcked(QuicByteCount acked_bytes) {
-  bytes_delivered_since_loss_ += acked_bytes;
-  ++ack_count_since_loss_;
-}
-
-QuicTime::Delta PrrSender::TimeUntilSend(
-    QuicByteCount congestion_window,
-    QuicByteCount bytes_in_flight,
-    QuicByteCount slowstart_threshold) const {
-  //   if (FLAGS_?? && bytes_in_flight < congestion_window) {
-  //     return QuicTime::Delta::Zero();
-  //   }
-  // Return QuicTime::Zero In order to ensure limited transmit always works.
-  if (bytes_sent_since_loss_ == 0 || bytes_in_flight < kMaxSegmentSize) {
-    return QuicTime::Delta::Zero();
-  }
-  if (congestion_window > bytes_in_flight) {
-    // During PRR-SSRB, limit outgoing packets to 1 extra MSS per ack, instead
-    // of sending the entire available window. This prevents burst retransmits
-    // when more packets are lost than the CWND reduction.
-    //   limit = MAX(prr_delivered - prr_out, DeliveredData) + MSS
-    if (bytes_delivered_since_loss_ + ack_count_since_loss_ * kMaxSegmentSize <=
-        bytes_sent_since_loss_) {
-      return QuicTime::Delta::Infinite();
-    }
-    return QuicTime::Delta::Zero();
-  }
-  // Implement Proportional Rate Reduction (RFC6937).
-  // Checks a simplified version of the PRR formula that doesn't use division:
-  // AvailableSendWindow =
-  //   CEIL(prr_delivered * ssthresh / BytesInFlightAtLoss) - prr_sent
-  if (bytes_delivered_since_loss_ * slowstart_threshold >
-      bytes_sent_since_loss_ * bytes_in_flight_before_loss_) {
-    return QuicTime::Delta::Zero();
-  }
-  return QuicTime::Delta::Infinite();
-}
-
-}  // namespace net