net/mlx5: fix suffix flow creation in metadata split

  The variable cleanup was erroneously done before pointer usage.
The cleanup is moved to appropriate place, comment is clarified.

Fixes: 8d72fa668964 ("net/mlx5: share tag between meter and metadata")

Reported-by: Eli Britstein <elibr@mellanox.com>
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)
  

From: Viacheslav Ovsiienko
> The variable cleanup was erroneously done before pointer usage.
> The cleanup is moved to appropriate place, comment is clarified.
> 
> Fixes: 8d72fa668964 ("net/mlx5: share tag between meter and metadata")
> 
> Reported-by: Eli Britstein <elibr@mellanox.com>
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>


Acked-by: Matan Azrad <matan@mellanox.com>
  

Hi,

> -----Original Message-----
> From: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> Sent: Wednesday, November 13, 2019 10:28 AM
> To: dev@dpdk.org
> Cc: Matan Azrad <matan@mellanox.com>; Raslan Darawsheh
> <rasland@mellanox.com>; Ori Kam <orika@mellanox.com>
> Subject: [PATCH] net/mlx5: fix suffix flow creation in metadata split
> 
> The variable cleanup was erroneously done before pointer usage.
> The cleanup is moved to appropriate place, comment is clarified.
> 
> Fixes: 8d72fa668964 ("net/mlx5: share tag between meter and metadata")
> 
> Reported-by: Eli Britstein <elibr@mellanox.com>
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_flow.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index 14a89e2..d677de8 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -3862,16 +3862,18 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
>  			},
>  		};
>  		uint64_t hash_fields = dev_flow->hash_fields;
> -		dev_flow = NULL;
> +
>  		/*
> -		 * Configure the tag action only if we are not the meter sub
> -		 * flow. Since tag is already marked in the meter suffix sub
> -		 * flow.
> +		 * Configure the tag item only if there is no meter subflow.
> +		 * Since tag is already marked in the meter suffix subflow
> +		 * we can just use the meter suffix items as is.
>  		 */
>  		if (qrss_id) {
> +			/* Not meter subflow. */
> +			assert(!mtr_sfx);
>  			/*
>  			 * Put unique id in prefix flow due to it is destroyed
> -			 * after prefix flow and id will be freed after there
> +			 * after suffix flow and id will be freed after there
>  			 * is no actual flows with this id and identifier
>  			 * reallocation becomes possible (for example, for
>  			 * other flows in other threads).
> @@ -3884,6 +3886,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
>  				goto exit;
>  			q_tag_spec.id = ret;
>  		}
> +		dev_flow = NULL;
>  		/* Add suffix subflow to execute Q/RSS. */
>  		ret = flow_create_split_inner(dev, flow, &dev_flow,
>  					      &q_attr, mtr_sfx ? items :
> --
> 1.8.3.1


Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh