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/svm/svm_fifo_segment.c b/src/svm/svm_fifo_segment.c
index eef2168c477..c4ac235252c 100644
--- a/src/svm/svm_fifo_segment.c
+++ b/src/svm/svm_fifo_segment.c
@@ -305,14 +305,17 @@ svm_fifo_segment_free_fifo (svm_fifo_segment_private_t * s, svm_fifo_t * f,
       /* Remove from active list */
       if (f->prev)
 	f->prev->next = f->next;
+      else
+	fsh->fifos = f->next;
       if (f->next)
 	f->next->prev = f->prev;
-      /* FALLTHROUGH */
+      /* Fall through: we add only rx fifos to active pool */
     case FIFO_SEGMENT_TX_FREELIST:
       /* Add to free list */
       f->next = fsh->free_fifos[list_index];
+      f->prev = 0;
       fsh->free_fifos[list_index] = f;
-      /* FALLTHROUGH */
+      break;
     case FIFO_SEGMENT_FREELIST_NONE:
       break;