Overall tcp performance improvements (VPP-846)

- limit minimum rto per connection
- cleanup sack scoreboard
- switched svm fifo out-of-order data handling from absolute offsets to
  relative offsets.
- improve cwnd handling when using sacks
- add cc event debug stats
- improved uri tcp test client/server:  bugfixes and added half-duplex mode
- expanded builtin client/server
- updated uri socket client/server code to work in half-duplex
- ensure session node unsets fifo event for empty fifo
- fix session detach

Change-Id: Ia446972340e32a65e0694ee2844355167d0c170d
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/vnet/session/node.c b/src/vnet/session/node.c
index 07eeae82915..c0ab1bf096f 100644
--- a/src/vnet/session/node.c
+++ b/src/vnet/session/node.c
@@ -171,7 +171,10 @@ session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
 
   /* Nothing to read return */
   if (max_dequeue0 == 0)
-    return 0;
+    {
+      svm_fifo_unset_event (s0->server_tx_fifo);
+      return 0;
+    }
 
   /* Ensure we're not writing more than transport window allows */
   if (max_dequeue0 < snd_space0)
@@ -393,7 +396,7 @@ session_event_get_session (session_fifo_event_t * e0, u8 thread_index)
 
   s0 = stream_session_get_if_valid (session_index0, thread_index);
 
-  ASSERT (s0->thread_index == thread_index);
+  ASSERT (s0 == 0 || s0->thread_index == thread_index);
 
   return s0;
 }