[dpdk-stable] [PATCH v2] net/mlx5: fix incorrect pointer operation in meter

[Suanming Mou <suanmingm@mellanox.com>]

The meter suffix flow item pointer restore is not correct to decrease
a fixed value. The incorrect operation will cause incorrect match to
the meter suffix flow, the flow create will fail once the magic number
in the wrong offset memory start with RTE_FLOW_ITEM_TYPE_END.
The pointer should decrease the real offset it increases.

Set the decrease value to the real offset the pointer increases to fix
the issue.

Fixes: 9ea9b049a960 ("net/mlx5: split meter flow")
Cc: stable@dpdk.org

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Reported-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---

v2: commit message adjust.

---
 drivers/net/mlx5/mlx5_flow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index cb9d265..52ffcb2 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -4037,7 +4037,7 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 			sfx_items++;
 		}
 		sfx_items->type = RTE_FLOW_ITEM_TYPE_END;
-		sfx_items -= METER_SUFFIX_ITEM;
+		sfx_items -= sfx_port_id_item ? 2 : 1;
 		/* Setting the sfx group atrr. */
 		sfx_attr.group = sfx_attr.transfer ?
 				(MLX5_FLOW_TABLE_LEVEL_SUFFIX - 1) :
-- 
1.8.3.1