linux-kernel - Re: [PATCH] vdpa/mlx5: Add the support of set mac address

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Message-ID: <b680300d-d18d-45b8-848f-85824332c7ca@lunn.ch>
Date: Mon, 8 Jul 2024 21:00:54 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Cindy Lu <lulu@...hat.com>
Cc: dtatulea@...dia.com, mst@...hat.com, jasowang@...hat.com,
	parav@...dia.com, sgarzare@...hat.com, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] vdpa/mlx5: Add the support of set mac address

On Mon, Jul 08, 2024 at 02:55:49PM +0800, Cindy Lu wrote:
> Add the function to support setting the MAC address.
> For vdpa/mlx5, the function will use mlx5_mpfs_add_mac
> to set the mac address
> 
> Tested in ConnectX-6 Dx device
> 
> Signed-off-by: Cindy Lu <lulu@...hat.com>
> ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 26ba7da6b410..f78701386690 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -3616,10 +3616,33 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
>  	destroy_workqueue(wq);
>  	mgtdev->ndev = NULL;
>  }
> +static int mlx5_vdpa_set_attr_mac(struct vdpa_mgmt_dev *v_mdev,
> +				  struct vdpa_device *dev,
> +				  const struct vdpa_dev_set_config *add_config)
> +{
> +	struct mlx5_vdpa_dev *mvdev = to_mvdev(dev);
> +	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> +	struct mlx5_core_dev *mdev = mvdev->mdev;
> +	struct virtio_net_config *config = &ndev->config;
> +	int err;
> +	struct mlx5_core_dev *pfmdev;
> +
> +	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
> +		if (!is_zero_ether_addr(add_config->net.mac)) {

Is the core happy to call into the driver without validating the MAC
address? Will the core pass the broadcast address? That is not
zero. Or a multicast address? Should every driver repeat the same
validation, and probably get it just as wrong?

    Andrew

---
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