[dpdk-dev] [PATCH 1/4] net/mlx5: fix num seg assumption on vPMD

[Shahaf Shuler <shahafs@mellanox.com>]

vPMD Tx function assumes that after the scatter of the
multi-segment packets the next packet will be a single segment packet.

This is not current as the function can return due to lack of resources
without sending all of the multi-segment mbufs sequence.

Fixes: 6cb559d67b83 ("net/mlx5: add vectorized Rx/Tx burst for x86")
Cc: stable@dpdk.org
Cc: yskoh@mellanox.com

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx_vec_sse.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_sse.c b/drivers/net/mlx5/mlx5_rxtx_vec_sse.c
index 37854a73b..f89762ff8 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.c
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.c
@@ -112,8 +112,7 @@ txq_wr_dseg_v(struct txq *txq, __m128i *dseg,
 }
 
 /**
- * Count the number of continuous single segment packets. The first packet must
- * be a single segment packet.
+ * Count the number of continuous single segment packets.
  *
  * @param pkts
  *   Pointer to array of packets.
@@ -130,9 +129,8 @@ txq_check_multiseg(struct rte_mbuf **pkts, uint16_t pkts_n)
 
 	if (!pkts_n)
 		return 0;
-	assert(NB_SEGS(pkts[0]) == 1);
 	/* Count the number of continuous single segment packets. */
-	for (pos = 1; pos < pkts_n; ++pos)
+	for (pos = 0; pos < pkts_n; ++pos)
 		if (NB_SEGS(pkts[pos]) > 1)
 			break;
 	return pos;
-- 
2.12.0