Re: [PATCH for 8.1] vdpa: accept VIRTIO_NET_F_SPEED_DUPLEX in SVQ

[Eugenio Perez Martin]

On Tue, Mar 7, 2023 at 6:02 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Tue, Mar 07, 2023 at 06:00:18PM +0100, Eugenio Pérez wrote:
> > There is no reason to block it as it has nothing to do with the vrings.
> > All the support of the feature comes via config space.
> >
> > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> > Suggested-by: Alvaro Karsz <alvaro.karsz@solid-run.com>
>
> do we need to version this with machine type btw?
>

No, as far as I know. If the destination qemu does not support
VIRTIO_NET_F_SPEED_DUPLEX and it enables SVQ it will refuse to start.

Thanks!

> > ---
> >  net/vhost-vdpa.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> > index de5ed8ff22..8b25559320 100644
> > --- a/net/vhost-vdpa.c
> > +++ b/net/vhost-vdpa.c
> > @@ -99,7 +99,8 @@ static const uint64_t vdpa_svq_device_features =
> >      BIT_ULL(VIRTIO_F_ANY_LAYOUT) |
> >      BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |
> >      BIT_ULL(VIRTIO_NET_F_RSC_EXT) |
> > -    BIT_ULL(VIRTIO_NET_F_STANDBY);
> > +    BIT_ULL(VIRTIO_NET_F_STANDBY) |
> > +    BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX);
> >
> >  #define VHOST_VDPA_NET_CVQ_ASID 1
> >
> > --
> > 2.31.1
>