SPDY flow control: enforce obeying send window size via a command-line switch, initial support for receive window size.

BUG=48100
TEST=net_unittestss --gtest_filter="SpdyProtocolTest.ControlFrameStructs:SpdyNetworkTransactionTest.WindowUpdate:SpdyNetworkTransactionTest.WindowUpdateOverflow"

Review URL: http://codereview.chromium.org/3052005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53297 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 4 deletions

diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 3add9b0..16f4517 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -31,6 +31,13 @@
 
 namespace net {
 
+// This is somewhat arbitrary and not really fixed, but it will always work
+// reasonably with ethernet. Chop the world into 2-packet chunks.  This is
+// somewhat arbitrary, but is reasonably small and ensures that we elicit
+// ACKs quickly from TCP (because TCP tries to only ACK every other packet).
+const int kMss = 1430;
+const int kMaxSpdyFrameChunkSize = (2 * kMss) - spdy::SpdyFrame::size();
+
 class SpdyStream;
 class HttpNetworkSession;
 class BoundNetLog;
@@ -118,6 +125,9 @@ class SpdySession : public base::RefCounted<SpdySession>,
   static void SetSSLMode(bool enable) { use_ssl_ = enable; }
   static bool SSLMode() { return use_ssl_; }
 
+  // Enable or disable flow control.
+  static void SetFlowControl(bool enable) { use_flow_control_ = enable; }
+
   // If session is closed, no new streams/transactions should be created.
   bool IsClosed() const { return state_ == CLOSED; }
 
@@ -327,14 +337,15 @@ class SpdySession : public base::RefCounted<SpdySession>,
 
   bool in_session_pool_;  // True if the session is currently in the pool.
 
-  int initial_window_size_; // Initial window size for the session; can be
-                            // changed by an arriving SETTINGS frame; newly
-                            // created streams use this value for the initial
-                            // window size.
+  // Initial send window size for the session; can be changed by an
+  // arriving SETTINGS frame; newly created streams use this value for the
+  // initial send window size.
+  int initial_send_window_size_;
 
   BoundNetLog net_log_;
 
   static bool use_ssl_;
+  static bool use_flow_control_;
 };
 
 }  // namespace net