[PATCH v2] eventdev/crypto: fix circular buffer full case

[Ganapati Kundapura <ganapati.kundapura@intel.com>]

crypto ops from the circular buffer are not getting flushed
to crypto dev when crypto dev becomes busy and circular buffer
gets full.

Fix it by flushing ops from circular buffer when circ buffer is full
instead of returning without flushing.

Fixes: 2ae84b39ae7b ("eventdev/crypto: store operations in circular buffer")
Signed-off-by: Ganapati Kundapura <ganapati.kundapura@intel.com>

diff --git a/lib/eventdev/rte_event_crypto_adapter.c b/lib/eventdev/rte_event_crypto_adapter.c
index 52a28e5..1b435c9 100644
--- a/lib/eventdev/rte_event_crypto_adapter.c
+++ b/lib/eventdev/rte_event_crypto_adapter.c
@@ -248,9 +248,18 @@ eca_circular_buffer_flush_to_cdev(struct crypto_ops_circular_buffer *bufp,
 		n = *tailp - *headp;
 	else if (*tailp < *headp)
 		n = bufp->size - *headp;
-	else {
-		*nb_ops_flushed = 0;
-		return 0;  /* buffer empty */
+	else { /* head == tail case */
+		/* when head == tail,
+		 * circ buff is either full(tail pointer roll over) or empty
+		 */
+		if (bufp->count != 0) {
+			/* circ buffer is full */
+			n = bufp->count;
+		} else {
+			/* circ buffer is empty */
+			*nb_ops_flushed = 0;
+			return 0;  /* buffer empty */
+		}
 	}
 
 	*nb_ops_flushed = rte_cryptodev_enqueue_burst(cdev_id, qp_id,
-- 
2.6.4