QUIC - disable QUIC if packet loss rate is bad for a connection.

net/quic/quic_stream_factory.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.
 
 #ifndef NET_QUIC_QUIC_STREAM_FACTORY_H_
 #define NET_QUIC_QUIC_STREAM_FACTORY_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 90 matching lines @@
       size_t max_packet_length,
       const std::string& user_agent_id,
       const QuicVersionVector& supported_versions,
       bool enable_port_selection,
       bool always_require_handshake_confirmation,
       bool disable_connection_pooling,
       float load_server_info_timeout_srtt_multiplier,
       bool enable_connection_racing,
       bool enable_non_blocking_io,
       bool disable_disk_cache,
+      int max_number_of_lossy_connections,
+      float packet_loss_threshold,
       int socket_receive_buffer_size,
       const QuicTagVector& connection_options);
   ~QuicStreamFactory() override;
 
   // Creates a new QuicHttpStream to |host_port_pair| which will be
   // owned by |request|. |is_https| specifies if the protocol is https or not.
   // If a matching session already exists, this method will return OK.  If no
   // matching session exists, this will return ERR_IO_PENDING and will invoke
   // OnRequestComplete asynchronously.
   int Create(const HostPortPair& host_port_pair,
              bool is_https,
              PrivacyMode privacy_mode,
              base::StringPiece method,
              const BoundNetLog& net_log,
              QuicStreamRequest* request);
 
+  // Returns false if |packet_loss_rate| is less than |packet_loss_threshold_|
+  // otherwise it returns true and closes the session and marks QUIC as recently
+  // broken for the port of the session. Increments
+  // |number_of_lossy_connections_| by port.
+  bool OnHandshakeConfirmed(QuicClientSession* session, float packet_loss_rate);
+
+  // Returns true if QUIC is disabled for this port.
+  bool IsQuicDisabled(uint16 port);
+
   // Called by a session when it becomes idle.
   void OnIdleSession(QuicClientSession* session);
 
   // Called by a session when it is going away and no more streams should be
   // created on it.
   void OnSessionGoingAway(QuicClientSession* session);
 
   // Called by a session after it shuts down.
   void OnSessionClosed(QuicClientSession* session);
 
@@ skipping 183 matching lines @@
   // INCHOATE_HELLO and another connection that sends CHLO after loading server
   // config from the disk cache.
   bool enable_connection_racing_;
 
   // Set if experimental non-blocking IO should be used on windows sockets.
   bool enable_non_blocking_io_;
 
   // Set if we do not want to load server config from the disk cache.
   bool disable_disk_cache_;
 
+  // Set if we want to disable QUIC when there is high packet loss rate.
+  // Specifies the maximum number of connections with high packet loss in a row
+  // after which QUIC will be disabled.
+  int max_number_of_lossy_connections_;
+  // Specifies packet loss rate in franction after which a connection is closed
+  // and is considered as a lossy connection.
+  float packet_loss_threshold_;
+  // Count number of lossy connections by port.
+  std::map<uint16, int> number_of_lossy_connections_;
+
   // Size of the UDP receive buffer.
   int socket_receive_buffer_size_;
 
   // Each profile will (probably) have a unique port_seed_ value.  This value
   // is used to help seed a pseudo-random number generator (PortSuggester) so
   // that we consistently (within this profile) suggest the same ephemeral
   // port when we re-connect to any given server/port.  The differences between
   // profiles (probablistically) prevent two profiles from colliding in their
   // ephemeral port requests.
   uint64 port_seed_;
 
   // Local address of socket that was created in CreateSession.
   IPEndPoint local_address_;
   bool check_persisted_supports_quic_;
   std::set<HostPortPair> quic_supported_servers_at_startup_;
 
   NetworkConnection network_connection_;
 
   base::TaskRunner* task_runner_;
 
   base::WeakPtrFactory<QuicStreamFactory> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicStreamFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_STREAM_FACTORY_H_