netdev - Re: [PATCH net-next v2 5/5] net/mlx5e: Return -EOPNOTSUPP when attempting to offload an unsupported action

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Date:   Tue, 26 Feb 2019 13:49:18 +0000
From:   Roi Dayan <roid@...lanox.com>
To:     "xiangxia.m.yue@...il.com" <xiangxia.m.yue@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "gerlitz.or@...il.com" <gerlitz.or@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 5/5] net/mlx5e: Return -EOPNOTSUPP when
 attempting to offload an unsupported action



On 25/02/2019 12:40, xiangxia.m.yue@...il.com wrote:
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> 
> The encapsulation is not supported for mlx5 VFs. When we try to
> offload that action, the -EINVAL is returned, but not -EOPNOTSUPP.
> This patch changes the returned value and ignore to confuse user.
> 
> For example: (p2p1_0 is VF net device)
> tc filter add dev p2p1_0 protocol ip  parent ffff: prio 1 flower skip_sw \
> 	src_mac e4:11:22:33:44:01	\
> 	action tunnel_key set		\
> 	src_ip 1.1.1.100		\
> 	dst_ip 1.1.1.200		\
> 	dst_port 4789 id 100		\
> 	action mirred egress redirect dev vxlan0
> 
> "RTNETLINK answers: Invalid argument"
> 
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> index d9fcb14..f5029ea 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> @@ -2302,7 +2302,8 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
>  			}
>  			break;
>  		default:
> -			return -EINVAL;
> +			NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
> +			return -EOPNOTSUPP;
>  		}
>  	}
>  
> @@ -2624,7 +2625,8 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
>  			break;
>  			}
>  		default:
> -			return -EINVAL;
> +			NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
> +			return -EOPNOTSUPP;
>  		}
>  	}
>  
> 

Reviewed-by: Roi Dayan <roid@...lanox.com>