Re: [Qemu-stable] [Qemu-devel] [RFC] vhost-user: don't ignore CTRL_VLAN feature

[Jason Wang]

On 2019/6/11 下午2:51, Tiwei Bie wrote:
> The VIRTIO_NET_F_CTRL_VLAN feature requires the support of
> vhost-user backend. But it will be advertised to guest driver
> as long as it's enabled by users in QEMU, while it's not
> supported by vhost-user backend. This patch fixes this issue.
>
> Fixes: 72018d1e1917 ("vhost-user: ignore qemu-only features")


My understanding is if may want to revert this patch.


> Cc: address@hidden
>
> Signed-off-by: Tiwei Bie <address@hidden>
> ---
> It's not clear in the spec that, whether vlan filtering is
> also best-effort:
> https://github.com/oasis-tcs/virtio-spec/blob/37057052e7/content.tex#L3372


It should be a bug of the code, we should consider to implement ctrl 
command for vhost-user.

Thanks


>   hw/net/vhost_net.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> index a6b719035c..1444fc9230 100644
> --- a/hw/net/vhost_net.c
> +++ b/hw/net/vhost_net.c
> @@ -75,6 +75,8 @@ static const int user_feature_bits[] = {
>       VIRTIO_NET_F_MTU,
>       VIRTIO_F_IOMMU_PLATFORM,
>   
> +    VIRTIO_NET_F_CTRL_VLAN,
> +
>       /* This bit implies RARP isn't sent by QEMU out of band */
>       VIRTIO_NET_F_GUEST_ANNOUNCE,
>