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

net/quic/quic_stream_factory.h

Index: net/quic/quic_stream_factory.h
diff --git a/net/quic/quic_stream_factory.h b/net/quic/quic_stream_factory.h
index c55059002be1edb4185c311b53eb601d59f0a3b4..fa9b835d23c6d5c0ec4fcadc647dc91bb2a74940 100644
--- a/net/quic/quic_stream_factory.h
+++ b/net/quic/quic_stream_factory.h
@@ -108,6 +108,8 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
       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;
@@ -124,6 +126,12 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
              const BoundNetLog& net_log,
              QuicStreamRequest* request);
 
+  // Keeps track of connections that had bad packet loss when handshake is
+  // confirmed. Marks QUIC as recently broken for the given |server_id|. If the
+  // total number of lossy connections is more than
+  // max_number_of_lossy_connections_ then QUIC is disabled.
+  void OnBadPacketLoss(const QuicServerId& server_id);
+
   // Called by a session when it becomes idle.
   void OnIdleSession(QuicClientSession* session);
 
@@ -185,6 +193,10 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
     enable_connection_racing_ = enable_connection_racing;
   }
 
+  bool quic_is_disabled() const { return quic_is_disabled_; }

[Ryan Hamilton, 2015/03/23 02:31:06]

I think we need this per-port.

[ramant (doing other things), 2015/03/24 03:07:22]

Done.

+
+  float packet_loss_threshold() const { return packet_loss_threshold_; }
+
  private:
   class Job;
   friend class test::QuicStreamFactoryPeer;
@@ -327,6 +339,13 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
   // 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.
+  int max_number_of_lossy_connections_;
+  int number_of_lossy_connections_;  // Count of connections with high packet
+                                     // loss.
+  bool quic_is_disabled_;            // Disabled in case of high packet loss.
+  float packet_loss_threshold_;
+
   // Size of the UDP receive buffer.
   int socket_receive_buffer_size_;