linux-kernel - Re: [PATCH RFC 3/3] vdpa/mlx5: Disable VLAN support to support live migration

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Date:   Mon, 20 Jun 2022 11:01:37 +0200
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Eli Cohen <elic@...dia.com>, mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Parav Pandit <parav@...dia.com>
Subject: Re: [PATCH RFC 3/3] vdpa/mlx5: Disable VLAN support to support live migration

On Mon, Jun 20, 2022 at 10:48 AM Jason Wang <jasowang@...hat.com> wrote:
>
> On Thu, Jun 16, 2022 at 9:28 PM Eli Cohen <elic@...dia.com> wrote:
> >
> > Current qemu code does not support live migration for devices supporting
> > VLAN. Disable it.
>
> This looks like a bug that we need to fix in Qemu.
>

Not a but, but a lack of a feature :). Each cvq command needs new code
to inject it at the destination, and only set mac cmd is implemented
at the moment. Only to start simple.

Thanks!

> Thanks
>
> >
> > Note: this patch is provided just to enable testing with current qemu.
> >
> > Signed-off-by: Eli Cohen <elic@...dia.com>
> > ---
> >  drivers/vdpa/mlx5/net/mlx5_vnet.c | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index 34bd81cb697c..1568cfdf07e6 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -2172,7 +2172,6 @@ static u64 get_supported_features(struct mlx5_core_dev *mdev)
> >         mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MQ);
> >         mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_STATUS);
> >         mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MTU);
> > -       mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_CTRL_VLAN);
> >
> >         return mlx_vdpa_features;
> >  }
> > --
> > 2.35.1
> >
>