netdev - Re: [RFC v2 5/6] mlx4: report errors through extack

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Date:   Mon, 4 Mar 2019 11:54:17 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC v2 5/6] mlx4: report errors through extack



On 2/28/2019 11:54 PM, Stephen Hemminger wrote:
> XDP errors should be reported via extack (back to command)
> rather than on console.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> ---
>   drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index c1438ae52a11..75ae06c82294 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -2779,7 +2779,8 @@ static int mlx4_en_set_tx_maxrate(struct net_device *dev, int queue_index, u32 m
>   	return err;
>   }
>   
> -static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog)
> +static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog,
> +			struct netlink_ext_ack *extack)
>   {
>   	struct mlx4_en_priv *priv = netdev_priv(dev);
>   	struct mlx4_en_dev *mdev = priv->mdev;
> @@ -2816,8 +2817,10 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog)
>   		return 0;
>   	}
>   
> -	if (!mlx4_en_check_xdp_mtu(dev, dev->mtu))
> +	if (!mlx4_en_check_xdp_mtu(dev, dev->mtu)) {
> +		NL_SET_ERR_MSG_MOD(extack, "MTU exceeds support XDP maximum");
>   		return -EOPNOTSUPP;
> +	}
>   
>   	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
>   	if (!tmp)
> @@ -2870,8 +2873,8 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog)
>   	if (port_up) {
>   		err = mlx4_en_start_port(dev);
>   		if (err) {
> -			en_err(priv, "Failed starting port %d for XDP change\n",
> -			       priv->port);
> +			NL_SET_ERR_MSG_MOD(extack,
> +				       "Failed starting port for XDP change");

Any reason not to keep the port number? It used to be printed.

>   			queue_work(mdev->workqueue, &priv->watchdog_task);
>   		}
>   	}
> @@ -2908,11 +2911,12 @@ static int mlx4_xdp(struct net_device *dev, struct netdev_bpf *xdp)
>   {
>   	switch (xdp->command) {
>   	case XDP_SETUP_PROG:
> -		return mlx4_xdp_set(dev, xdp->prog);
> +		return mlx4_xdp_set(dev, xdp->prog, xdp->extack);
>   	case XDP_QUERY_PROG:
>   		xdp->prog_id = mlx4_xdp_query(dev);
>   		return 0;
>   	default:
> +		NL_SET_ERR_MSG_MOD(xdp->extack, "Unsupported XDP command");
>   		return -EINVAL;
>   	}
>   }
>