[dpdk-stable] [PATCH] net/mlx5: fix wrong Flow Tag decompression

[Alexander Kozyrev]

Packets can get a wrong Flow Tag on x86 architecture with the Flow Tag
compression format (rxq_cqe_comp_en=2) enabled inside the SSE Rx burst.
The shuffle mask that extracts a Flow Tag from the pair of compressed
CQEs is reversed. This leads to the wrong Flow Tag assignment.
Correct the shuffle mask to get proper bytes for a Flow Tag from miniCQEs.

Fixes: 54c2d46b160 ("net/mlx5: support flow tag and packet header miniCQEs")
Cc: stable at dpdk.org

Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>
---
 drivers/net/mlx5/mlx5_rxtx_vec_sse.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
index d4df9816aa..0b3f240e10 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h
@@ -197,8 +197,8 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq, volatile struct mlx5_cqe *cq,
 				const __m128i flow_mark_adj =
 					_mm_set_epi32(-1, -1, -1, -1);
 				const __m128i flow_mark_shuf =
-					_mm_set_epi8(-1,  1,  0,  4,
-						     -1,  9,  8, 12,
+					_mm_set_epi8(-1,  9,  8, 12,
+						     -1,  1,  0,  4,
 						     -1, -1, -1, -1,
 						     -1, -1, -1, -1);
 				const __m128i ft_mask =
-- 
2.24.1