[PATCH v7 3/4] net/mlx5: fix warning about rte_memcpy length

[Morten Brørup]

PING mlx5 maintainers. Care to review this minor improvement, so it can be included in 23.03?

> From: Morten Brørup [mailto:mb at smartsharesystems.com]
> Sent: Monday, 16 January 2023 14.07
> 
> Use RTE_PTR_ADD where copying to the offset of a field in a structure
> holding multiple fields, to avoid compiler warnings with decorated
> rte_memcpy.
> 
> Fixes: 16a7dbc4f69006cc1c96ca2a2c6d3e3c51a2ff50 ("net/mlx5: make flow
> modify action list thread safe")
> Cc: xuemingl at nvidia.com
> Cc: matan at nvidia.com
> Cc: viacheslavo at nvidia.com
> 
> Signed-off-by: Morten Brørup <mb at smartsharesystems.com>
> ---
> v7:
> * No changes.
> v6:
> * Add Fixes to patch description.
> v5:
> * First patch in series.
> ---
>  drivers/net/mlx5/mlx5_flow_dv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c
> index 62c38b87a1..dd9f5fda1a 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -5662,7 +5662,7 @@ flow_dv_modify_create_cb(void *tool_ctx, void
> *cb_ctx)
>  				   "cannot allocate resource memory");
>  		return NULL;
>  	}
> -	rte_memcpy(&entry->ft_type,
> +	rte_memcpy(RTE_PTR_ADD(entry, offsetof(typeof(*entry), ft_type)),
>  		   RTE_PTR_ADD(ref, offsetof(typeof(*ref), ft_type)),
>  		   key_len + data_len);
>  	if (entry->ft_type == MLX5DV_FLOW_TABLE_TYPE_FDB)
> --
> 2.17.1