[dpdk-dev] [PATCH v3 1/8] net/mlx4: fix Tx packet drop application report

[Matan Azrad <matan@mellanox.com>]

When invalid lkey is sent to HW, HW sends an error notification in
completion function.

The previous code wouldn't crash but doesn't add any application report
in case of completion error, so application cannot know that packet
actually was dropped in case of invalid lkey.

Return back the lkey validation to Tx path.

Fixes: 2eee458746bc ("net/mlx4: remove error flows from Tx fast path")
Cc: stable@dpdk.org

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx4/mlx4_rxtx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/mlx4/mlx4_rxtx.c b/drivers/net/mlx4/mlx4_rxtx.c
index 2bfa8b1..0d008ed 100644
--- a/drivers/net/mlx4/mlx4_rxtx.c
+++ b/drivers/net/mlx4/mlx4_rxtx.c
@@ -468,7 +468,6 @@ struct pv {
 		/* Memory region key (big endian) for this memory pool. */
 		lkey = mlx4_txq_mp2mr(txq, mlx4_txq_mb2mp(sbuf));
 		dseg->lkey = rte_cpu_to_be_32(lkey);
-#ifndef NDEBUG
 		/* Calculate the needed work queue entry size for this packet */
 		if (unlikely(dseg->lkey == rte_cpu_to_be_32((uint32_t)-1))) {
 			/* MR does not exist. */
@@ -486,7 +485,6 @@ struct pv {
 					(sq->head & sq->txbb_cnt) ? 0 : 1);
 			return -1;
 		}
-#endif /* NDEBUG */
 		if (likely(sbuf->data_len)) {
 			byte_count = rte_cpu_to_be_32(sbuf->data_len);
 		} else {
@@ -636,7 +634,6 @@ struct pv {
 			/* Memory region key (big endian). */
 			lkey = mlx4_txq_mp2mr(txq, mlx4_txq_mb2mp(buf));
 			dseg->lkey = rte_cpu_to_be_32(lkey);
-#ifndef NDEBUG
 			if (unlikely(dseg->lkey ==
 				rte_cpu_to_be_32((uint32_t)-1))) {
 				/* MR does not exist. */
@@ -655,7 +652,6 @@ struct pv {
 				elt->buf = NULL;
 				break;
 			}
-#endif /* NDEBUG */
 			/* Never be TXBB aligned, no need compiler barrier. */
 			dseg->byte_count = rte_cpu_to_be_32(buf->data_len);
 			/* Fill the control parameters for this packet. */
-- 
1.8.3.1