[PATCH] app: fix silent enqueue fail in test_mbuf test_refcnt_iter

[jhascoet]

From: Julien Hascoet <ju.hasc...@gmail.com>

In case of ring full state, we retry the enqueue
operation in order to avoid mbuf loss.

Fixes: af75078fece ("first public release")

Signed-off-by: Julien Hascoet <ju.hasc...@gmail.com>
---
 app/test/test_mbuf.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/app/test/test_mbuf.c b/app/test/test_mbuf.c
index efac01806b..ad18bf6378 100644
--- a/app/test/test_mbuf.c
+++ b/app/test/test_mbuf.c
@@ -1033,12 +1033,21 @@ test_refcnt_iter(unsigned int lcore, unsigned int iter,
                tref += ref;
                if ((ref & 1) != 0) {
                        rte_pktmbuf_refcnt_update(m, ref);
-                       while (ref-- != 0)
-                               rte_ring_enqueue(refcnt_mbuf_ring, m);
+                       while (ref-- != 0) {
+                               /* retry in case of failure */
+                               while (rte_ring_enqueue(refcnt_mbuf_ring, m) != 
0) {
+                                       /* let others consume */
+                                       rte_pause();
+                               }
+                       }
                } else {
                        while (ref-- != 0) {
                                rte_pktmbuf_refcnt_update(m, 1);
-                               rte_ring_enqueue(refcnt_mbuf_ring, m);
+                               /* retry in case of failure */
+                               while (rte_ring_enqueue(refcnt_mbuf_ring, m) != 
0) {
+                                       /* let others consume */
+                                       rte_pause();
+                               }
                        }
                }
                rte_pktmbuf_free(m);
-- 
2.34.1