netdev - Re: [PATCH net-next] net: virtio: use eth_hw_addr

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Date:   Wed, 27 Oct 2021 10:45:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem <davem@...emloft.net>, netdev <netdev@...r.kernel.org>,
        mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH net-next] net: virtio: use eth_hw_addr_set()

On Wed, Oct 27, 2021 at 1:56 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
> of VLANs...") introduced a rbtree for faster Ethernet address look
> up. To maintain netdev->dev_addr in this tree we need to make all
> the writes to it go through appropriate helpers.

I think the title should be "net: virtio: use eth_hw_addr_set()"

>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> CC: mst@...hat.com
> CC: jasowang@...hat.com
> CC: virtualization@...ts.linux-foundation.org
> ---
>  drivers/net/virtio_net.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index c501b5974aee..b7f35aff8e82 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3177,12 +3177,16 @@ static int virtnet_probe(struct virtio_device *vdev)
>         dev->max_mtu = MAX_MTU;
>
>         /* Configuration may specify what MAC to use.  Otherwise random. */
> -       if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
> +       if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
> +               u8 addr[MAX_ADDR_LEN];
> +
>                 virtio_cread_bytes(vdev,
>                                    offsetof(struct virtio_net_config, mac),
> -                                  dev->dev_addr, dev->addr_len);
> -       else
> +                                  addr, dev->addr_len);
> +               dev_addr_set(dev, addr);
> +       } else {
>                 eth_hw_addr_random(dev);
> +       }

Do we need to change virtnet_set_mac_address() as well?

Thanks

>
>         /* Set up our device-specific information */
>         vi = netdev_priv(dev);
> --
> 2.31.1
>