Initial attempt at fast open UMA.

BUG=175623
R=rch@chromium.org
R=ycheng@google.com

Review URL: https://chromiumcodereview.appspot.com/13730013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193949 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 51 insertions, 0 deletions

diff --git a/net/socket/tcp_client_socket_libevent.h b/net/socket/tcp_client_socket_libevent.h
index 2ac1d6d..2533300 100644
--- a/net/socket/tcp_client_socket_libevent.h
+++ b/net/socket/tcp_client_socket_libevent.h
@@ -80,6 +80,55 @@ class NET_EXPORT_PRIVATE TCPClientSocketLibevent : public StreamSocket,
     CONNECT_STATE_NONE,
   };
 
+  // States that a fast open socket attempt can result in.
+  enum FastOpenStatus {
+    FAST_OPEN_STATUS_UNKNOWN,
+
+    // The initial fast open connect attempted returned synchronously,
+    // indicating that we had and sent a cookie along with the initial data.
+    FAST_OPEN_FAST_CONNECT_RETURN,
+
+    // The initial fast open connect attempted returned asynchronously,
+    // indicating that we did not have a cookie for the server.
+    FAST_OPEN_SLOW_CONNECT_RETURN,
+
+    // Some other error occurred on connection, so we couldn't tell if
+    // fast open would have worked.
+    FAST_OPEN_ERROR,
+
+    // An attempt to do a fast open succeeded immediately
+    // (FAST_OPEN_FAST_CONNECT_RETURN) and we later confirmed that the server
+    // had acked the data we sent.
+    FAST_OPEN_SYN_DATA_ACK,
+
+    // An attempt to do a fast open succeeded immediately
+    // (FAST_OPEN_FAST_CONNECT_RETURN) and we later confirmed that the server
+    // had nacked the data we sent.
+    FAST_OPEN_SYN_DATA_NACK,
+
+    // An attempt to do a fast open succeeded immediately
+    // (FAST_OPEN_FAST_CONNECT_RETURN) and our probe to determine if the
+    // socket was using fast open failed.
+    FAST_OPEN_SYN_DATA_FAILED,
+
+    // An attempt to do a fast open failed (FAST_OPEN_SLOW_CONNECT_RETURN)
+    // and we later confirmed that the server had acked initial data.  This
+    // should never happen (we didn't send data, so it shouldn't have
+    // been acked).
+    FAST_OPEN_NO_SYN_DATA_ACK,
+
+    // An attempt to do a fast open failed (FAST_OPEN_SLOW_CONNECT_RETURN)
+    // and we later discovered that the server had nacked initial data.  This
+    // is the expected case results for FAST_OPEN_SLOW_CONNECT_RETURN.
+    FAST_OPEN_NO_SYN_DATA_NACK,
+
+    // An attempt to do a fast open failed (FAST_OPEN_SLOW_CONNECT_RETURN)
+    // and our later probe for ack/nack state failed.
+    FAST_OPEN_NO_SYN_DATA_FAILED,
+
+    FAST_OPEN_MAX_VALUE
+  };
+
   class ReadWatcher : public MessageLoopForIO::Watcher {
    public:
     explicit ReadWatcher(TCPClientSocketLibevent* socket) : socket_(socket) {}
@@ -194,6 +243,8 @@ class NET_EXPORT_PRIVATE TCPClientSocketLibevent : public StreamSocket,
   // True when TCP FastOpen is in use and we have done the connect.
   bool tcp_fastopen_connected_;
 
+  enum FastOpenStatus fast_open_status_;
+
   DISALLOW_COPY_AND_ASSIGN(TCPClientSocketLibevent);
 };