TCP/session improvements

- Added svm fifo flag for tracking fifo dequeue events (replaces event
  length). Updated all code to switch to the new scheme.
- More session debugging
- Fix peek index wrap
- Add a trivial socket test client
- Fast retransmit/cc fixes
- tx and rx SACK fixes and unit testing
- SRTT computation fix
- remove dupack/ack burst filters
- improve ack rx
- improved segment rx
- builtin client test code

Change-Id: Ic4eb2d5ca446eb2260ccd3ccbcdaa73c64e7f4e1
Signed-off-by: Florin Coras <fcoras@cisco.com>
Signed-off-by: Dave Barach <dbarach@cisco.com>

1 files changed, 26 insertions, 2 deletions

diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index 70624b74ed1..39556173e4d 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -46,9 +46,11 @@ typedef struct
 {
   pthread_mutex_t mutex;	/* 8 bytes */
   pthread_cond_t condvar;	/* 8 bytes */
-  u32 owner_pid;
   svm_lock_tag_t tag;
-  volatile u32 cursize;
+
+  volatile u32 cursize;		/**< current fifo size */
+  volatile u8 has_event;	/**< non-zero if deq event exists */
+  u32 owner_pid;
   u32 nitems;
 
   /* Backpointers */
@@ -112,6 +114,28 @@ svm_fifo_has_ooo_data (svm_fifo_t * f)
   return f->ooos_list_head != OOO_SEGMENT_INVALID_INDEX;
 }
 
+/**
+ * Sets fifo event flag.
+ *
+ * @return 1 if flag was not set.
+ */
+always_inline u8
+svm_fifo_set_event (svm_fifo_t * f)
+{
+  /* Probably doesn't need to be atomic. Still, better avoid surprises */
+  return __sync_lock_test_and_set (&f->has_event, 1) == 0;
+}
+
+/**
+ * Unsets fifo event flag.
+ */
+always_inline void
+svm_fifo_unset_event (svm_fifo_t * f)
+{
+  /* Probably doesn't need to be atomic. Still, better avoid surprises */
+  __sync_lock_test_and_set (&f->has_event, 0);
+}
+
 svm_fifo_t *svm_fifo_create (u32 data_size_in_bytes);
 
 int svm_fifo_enqueue_nowait (svm_fifo_t * f, int pid, u32 max_bytes,