linux-kernel - Re: [PATCH net 6/6] net/mlx5e: Prevent bridge link show failure for non-eswitch-allowed devices

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Message-ID: <Z8/vY+fEb/CeDwtw@mev-dev.igk.intel.com>
Date: Tue, 11 Mar 2025 09:08:03 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Tariq Toukan <tariqt@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, Gal Pressman <gal@...dia.com>,
	Mark Bloch <mbloch@...dia.com>, Moshe Shemesh <moshe@...dia.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Carolina Jubran <cjubran@...dia.com>
Subject: Re: [PATCH net 6/6] net/mlx5e: Prevent bridge link show failure for
 non-eswitch-allowed devices

On Tue, Mar 11, 2025 at 12:01:44AM +0200, Tariq Toukan wrote:
> From: Carolina Jubran <cjubran@...dia.com>
> 
> mlx5_eswitch_get_vepa returns -EPERM if the device lacks
> eswitch_manager capability, blocking mlx5e_bridge_getlink from
> retrieving VEPA mode. Since mlx5e_bridge_getlink implements
> ndo_bridge_getlink, returning -EPERM causes bridge link show to fail
> instead of skipping devices without this capability.
> 
> To avoid this, return -EOPNOTSUPP from mlx5e_bridge_getlink when
> mlx5_eswitch_get_vepa fails, ensuring the command continues processing
> other devices while ignoring those without the necessary capability.
> 
> Fixes: 4b89251de024 ("net/mlx5: Support ndo bridge_setlink and getlink")
> Signed-off-by: Carolina Jubran <cjubran@...dia.com>
> Reviewed-by: Jianbo Liu <jianbol@...dia.com>
> Signed-off-by: Tariq Toukan <tariqt@...dia.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index a814b63ed97e..8fcaee381b0e 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -5132,11 +5132,9 @@ static int mlx5e_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
>  	struct mlx5e_priv *priv = netdev_priv(dev);
>  	struct mlx5_core_dev *mdev = priv->mdev;
>  	u8 mode, setting;
> -	int err;
>  
> -	err = mlx5_eswitch_get_vepa(mdev->priv.eswitch, &setting);
> -	if (err)
> -		return err;
> +	if (mlx5_eswitch_get_vepa(mdev->priv.eswitch, &setting))
> +		return -EOPNOTSUPP;
>  	mode = setting ? BRIDGE_MODE_VEPA : BRIDGE_MODE_VEB;
>  	return ndo_dflt_bridge_getlink(skb, pid, seq, dev,
>  				       mode,

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

> -- 
> 2.31.1