linux-kernel - Re: [PATCH] net/mlx5: DR, Use swap() instead of open coding it

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Message-ID: <5165bc9f-4e57-bdda-0640-d6cdcd08f031@intel.com>
Date:   Fri, 17 Nov 2023 10:18:35 +0100
From:   Przemek Kitszel <przemyslaw.kitszel@...el.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        <saeedm@...dia.com>
CC:     <leon@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH] net/mlx5: DR, Use swap() instead of open coding it

On 11/17/23 08:19, Jiapeng Chong wrote:
> Swap is a function interface that provides exchange function. To avoid
> code duplication, we can use swap function.
> 
> ./drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c:1254:50-51: WARNING opportunity for swap().
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7580
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>   .../net/ethernet/mellanox/mlx5/core/steering/dr_action.c  | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
> index e3ec559369fa..6f9790e97fed 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
> @@ -1170,7 +1170,6 @@ mlx5dr_action_create_mult_dest_tbl(struct mlx5dr_domain *dmn,
>   				   bool ignore_flow_level,
>   				   u32 flow_source)
>   {
> -	struct mlx5dr_cmd_flow_destination_hw_info tmp_hw_dest;
>   	struct mlx5dr_cmd_flow_destination_hw_info *hw_dests;
>   	struct mlx5dr_action **ref_actions;
>   	struct mlx5dr_action *action;
> @@ -1249,11 +1248,8 @@ mlx5dr_action_create_mult_dest_tbl(struct mlx5dr_domain *dmn,
>   	 * one that done in the TX.
>   	 * So, if one of the ft target is wire, put it at the end of the dest list.
>   	 */
> -	if (is_ft_wire && num_dst_ft > 1) {
> -		tmp_hw_dest = hw_dests[last_dest];
> -		hw_dests[last_dest] = hw_dests[num_of_dests - 1];
> -		hw_dests[num_of_dests - 1] = tmp_hw_dest;
> -	}
> +	if (is_ft_wire && num_dst_ft > 1)
> +		swap(hw_dests[last_dest], hw_dests[num_of_dests - 1]);
>   
>   	action = dr_action_create_generic(DR_ACTION_TYP_FT);
>   	if (!action)

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

For future non-bugfix contributions please target patches to net-next