[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.kundap...@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