[PATCH] net/mlx5: fix modify field action operation restriction

[Raslan Darawsheh]

Hi,

On 05/11/2025 10:50 AM, Maayan Kashani wrote:
> Update DV flow engine modify field validation:
> - Reject 'add' and 'sub' operations when source field is not VALUE
>    or POINTER in DV flow engine.
> 
> Update documentation to clarify operation support:
> - 'set' operation is supported in all modes
> - 'add' operation with VALUE/POINTER source fields is
>    supported in DV/HWS mode.
> - Specify relevant HW supporting packet header as 'src' field.
> - List supported 'dst' fields.
> 
> Fixes: 641dbe4fb053 ("net/mlx5: support modify field flow action")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Maayan Kashani <mkashani at nvidia.com>
> Acked-by: Dariusz Sosnowski <dsosnowski at nvidia.com>
>   
>   #. In template tables of group 0, the modify action must be fully masked.
>   
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
> index f765f941162..95ca57e8c46 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -5642,6 +5642,13 @@ flow_dv_validate_action_modify_field(struct rte_eth_dev *dev,
>   	}
>   	if (src_data->field != RTE_FLOW_FIELD_VALUE &&
>   	    src_data->field != RTE_FLOW_FIELD_POINTER) {
> +		if (conf->operation != RTE_FLOW_MODIFY_SET)
> +			return rte_flow_error_set(error, ENOTSUP,
> +						  RTE_FLOW_ERROR_TYPE_ACTION_CONF,
> +						  &conf->operation,
> +						  "modify field action type add is not"
> +						  " supported when src field type is"
> +						  " not value/pointer");
>   		if (root)
>   			return rte_flow_error_set(error, ENOTSUP,
>   					RTE_FLOW_ERROR_TYPE_ACTION, action,


Patch applied to next-net-mlx,

Kindest regards
Raslan Darawsheh