[PATCH v3 4/5] eventdev/crypto: fix overflow in circular buffer

[Ganapati Kundapura]

In case of crypto enqueue failures, even though backpressure
flag is set to stop further dequeue from eventdev, the current
logic does not stop dequeueing events for max_nb events.

This is fixed by checking the backpressure just before
dequeuing events from event device.

Fixes: 7901eac3409a ("eventdev: add crypto adapter implementation")

Signed-off-by: Ganapati Kundapura <ganapati.kundapura at intel.com>
---
v3:
* Updated commit message

v2:
* Updated subject line in commit message

diff --git a/lib/eventdev/rte_event_crypto_adapter.c b/lib/eventdev/rte_event_crypto_adapter.c
index c08984b..31b8255 100644
--- a/lib/eventdev/rte_event_crypto_adapter.c
+++ b/lib/eventdev/rte_event_crypto_adapter.c
@@ -573,14 +573,15 @@ eca_crypto_adapter_enq_run(struct event_crypto_adapter *adapter,
 	if (adapter->mode == RTE_EVENT_CRYPTO_ADAPTER_OP_NEW)
 		return 0;
 
-	if (unlikely(adapter->stop_enq_to_cryptodev)) {
-		nb_enqueued += eca_crypto_enq_flush(adapter);
+	for (nb_enq = 0; nb_enq < max_enq; nb_enq += n) {
 
-		if (unlikely(adapter->stop_enq_to_cryptodev))
-			goto skip_event_dequeue_burst;
-	}
+		if (unlikely(adapter->stop_enq_to_cryptodev)) {
+			nb_enqueued += eca_crypto_enq_flush(adapter);
+
+			if (unlikely(adapter->stop_enq_to_cryptodev))
+				break;
+		}
 
-	for (nb_enq = 0; nb_enq < max_enq; nb_enq += n) {
 		stats->event_poll_count++;
 		n = rte_event_dequeue_burst(event_dev_id,
 					    event_port_id, ev, BATCH_SIZE, 0);
@@ -591,8 +592,6 @@ eca_crypto_adapter_enq_run(struct event_crypto_adapter *adapter,
 		nb_enqueued += eca_enq_to_cryptodev(adapter, ev, n);
 	}
 
-skip_event_dequeue_burst:
-
 	if ((++adapter->transmit_loop_count &
 		(CRYPTO_ENQ_FLUSH_THRESHOLD - 1)) == 0) {
 		nb_enqueued += eca_crypto_enq_flush(adapter);
-- 
2.6.4