tcp: cleanup connection/session fixes

- Cleanup session state after last ack and avoid using a cleanup timer.
- Change session cleanup to free the session as opposed to waiting for
delete notify.
- When in close-wait, postpone sending the fin on close until all
outstanding data has been sent.
- Don't flush rx fifo unless in closed state

Change-Id: Ic2a4f0d5568b65c83f4b55b6c469a7b24b947f39
Signed-off-by: Florin Coras <fcoras@cisco.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c
index 10c319236ee..47df22547ac 100644
--- a/src/svm/svm_fifo.c
+++ b/src/svm/svm_fifo.c
@@ -828,6 +828,13 @@ svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes)
   return total_drop_bytes;
 }
 
+void
+svm_fifo_dequeue_drop_all (svm_fifo_t * f)
+{
+  f->head = f->tail;
+  __sync_fetch_and_sub (&f->cursize, f->cursize);
+}
+
 u32
 svm_fifo_number_ooo_segments (svm_fifo_t * f)
 {
diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index 39cdcc06a0c..90a49c03fc1 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -152,6 +152,7 @@ int svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 max_bytes, u8 * copy_here);
 
 int svm_fifo_peek (svm_fifo_t * f, u32 offset, u32 max_bytes, u8 * copy_here);
 int svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes);
+void svm_fifo_dequeue_drop_all (svm_fifo_t * f);
 u32 svm_fifo_number_ooo_segments (svm_fifo_t * f);
 ooo_segment_t *svm_fifo_first_ooo_segment (svm_fifo_t * f);
 void svm_fifo_init_pointers (svm_fifo_t * f, u32 pointer);