netdev - Re: [net-next 01/13] net/mlx5e: Print a warning when LRO feature is dropped or not allowed

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Date:   Tue, 30 Jul 2019 11:52:36 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Huy Nguyen <huyn@...lanox.com>
Subject: Re: [net-next 01/13] net/mlx5e: Print a warning when LRO feature is
 dropped or not allowed

On Mon, Jul 29, 2019 at 7:50 PM Saeed Mahameed <saeedm@...lanox.com> wrote:
>
> From: Huy Nguyen <huyn@...lanox.com>
>
> When user enables LRO via ethtool and if the RQ mode is legacy,
> mlx5e_fix_features drops the request without any explanation.
> Add netdev_warn to cover this case.
>
> Fixes: 6c3a823e1e9c ("net/mlx5e: RX, Remove HW LRO support in legacy RQ")
> Signed-off-by: Huy Nguyen <huyn@...lanox.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index 47eea6b3a1c3..776eb46d263d 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -3788,9 +3788,10 @@ static netdev_features_t mlx5e_fix_features(struct net_device *netdev,
>                         netdev_warn(netdev, "Dropping C-tag vlan stripping offload due to S-tag vlan\n");
>         }
>         if (!MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ)) {
> -               features &= ~NETIF_F_LRO;
> -               if (params->lro_en)
> +               if (features & NETIF_F_LRO) {
>                         netdev_warn(netdev, "Disabling LRO, not supported in legacy RQ\n");

This warns about "Disabling LRO" on an enable request?

More fundamentally, it appears that the device does not advertise
the feature as configurable in netdev_hw_features as of commit
6c3a823e1e9c ("net/mlx5e: RX, Remove HW LRO support in
legacy RQ"), so shouldn't this be caught by the device driver
independent ethtool code?