On Fri, Jan 27, 2023 at 09:44:59PM +0100, Laurent Vivier wrote:
> failover relies on the MAC address to pair the primary and the standby
> devices:
>
> "[...] the hypervisor needs to enable VIRTIO_NET_F_STANDBY
> feature on the virtio-net interface and assign the same MAC address
> to both virtio-net and VF interfaces."
>
> Documentation/networking/net_failover.rst
>
> This patch disables the STANDBY feature if the MAC address is not
> provided by the hypervisor.
>
> Signed-off-by: Laurent Vivier <lviv...@redhat.com>
Acked-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> drivers/net/virtio_net.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7723b2a49d8e..7d700f8e545a 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3688,6 +3688,12 @@ static int virtnet_validate(struct virtio_device *vdev)
> __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
> }
>
> + if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) &&
> + !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
> + dev_warn(&vdev->dev, "device advertises feature
> VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby");
> + __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY);
> + }
> +
> return 0;
> }
>
> --
> 2.39.1
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