netdev - Re: [PATCH net-next v2 1/5] net/mlx5e: Return -EOPNOTSUPP when modify header action zero

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Date:   Tue, 26 Feb 2019 13:54:24 +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 1/5] net/mlx5e: Return -EOPNOTSUPP when modify
 header action zero



On 25/02/2019 12:40, xiangxia.m.yue@...il.com wrote:
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> 
> When max modify header action is zero, we return -EOPNOTSUPP
> directly. In this way, we can ignore wrong message info (e.g.
> "mlx5: parsed 0 pedit actions, can't do more").
> 
> This happens when offloading pedit actions on mlx VFs.
> 
> For example:
> $ tc filter add dev mlx5_vf parent ffff: protocol ip prio 1 \
> 	flower skip_sw dst_mac 00:10:56:fb:64:e8 \
> 	dst_ip 1.1.1.100 src_ip 1.1.1.200 \
> 	action pedit ex munge eth src set 00:10:56:b4:5d:20
> 
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 12 ++++++++++--
>  1 file changed, 10 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 b38986e..708f819 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> @@ -2002,7 +2002,8 @@ static int offload_pedit_fields(struct pedit_headers_action *hdrs,
>  static int alloc_mod_hdr_actions(struct mlx5e_priv *priv,
>  				 struct pedit_headers_action *hdrs,
>  				 int namespace,
> -				 struct mlx5e_tc_flow_parse_attr *parse_attr)
> +				 struct mlx5e_tc_flow_parse_attr *parse_attr,
> +				 struct netlink_ext_ack *extack)
>  {
>  	int nkeys, action_size, max_actions;
>  
> @@ -2015,6 +2016,12 @@ static int alloc_mod_hdr_actions(struct mlx5e_priv *priv,
>  	else /* namespace is MLX5_FLOW_NAMESPACE_KERNEL - NIC offloading */
>  		max_actions = MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, max_modify_header_actions);
>  
> +	if (!max_actions) {
> +		NL_SET_ERR_MSG_MOD(extack,
> +				   "don't support pedit actions, can't offload");

can we rephrase that to match the msg style you did in patch 5 ?
i.e. The pedit offload action is not supported


> +		return -EOPNOTSUPP;
> +	}
> +
>  	/* can get up to crazingly 16 HW actions in 32 bits pedit SW key */
>  	max_actions = min(max_actions, nkeys * 16);
>  
> @@ -2072,7 +2079,8 @@ static int alloc_tc_pedit_action(struct mlx5e_priv *priv, int namespace,
>  	u8 cmd;
>  
>  	if (!parse_attr->mod_hdr_actions) {
> -		err = alloc_mod_hdr_actions(priv, hdrs, namespace, parse_attr);
> +		err = alloc_mod_hdr_actions(priv, hdrs,
> +					    namespace, parse_attr, extack);
>  		if (err)
>  			goto out_err;
>  	}
>