[dpdk-stable] patch 'net/mlx5: fix num seg assumption in SSE Tx' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 100ce89af93111f15e0b8eb2066dc8b789f7968a Mon Sep 17 00:00:00 2001
From: Shahaf Shuler <shahafs at mellanox.com>
Date: Thu, 14 Sep 2017 13:50:36 +0300
Subject: [PATCH] net/mlx5: fix num seg assumption in SSE Tx

[ upstream commit f2fdd44cc1a162d9f6c3c866f0eaca71670bb953 ]

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")

Signed-off-by: Shahaf Shuler <shahafs at mellanox.com>
Acked-by: Yongseok Koh <yskoh at mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro at 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 8560f74..6f4e1e8 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.c
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.c
@@ -119,8 +119,7 @@ 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.
@@ -137,9 +136,8 @@ 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;
-- 
2.7.4