Re: [PATCH v4 2/2] virtio_net: Extend virtio to use VF datapath when available

["Samudrala, Sridhar" <sridhar.samudrala@intel.com>]

On 3/2/2018 11:41 AM, Michael S. Tsirkin wrote:
> On Fri, Mar 02, 2018 at 07:26:25AM -0800, Alexander Duyck wrote:
> > The design limits things to a 1:1 relationship since we just have the
> > child and backup pointers, but I don't think I am seeing exception
> > handling to prevent us from overwriting the child pointers so there
> > may be a leak there.
> >
> > Thanks.
> >
> > - Alex
> In fact maintaining a list in that case would be nicer, and
> just use an arbitrary one.
> E.g. one can see how a user wanting to swap device 1 for device 2
> might first add device 2 with same MAC then drop device 1.

It should be possible to swap VF1 with VF2 by
- enabling virtio link
- unplugging VF1
- plugging VF2
- disabling virtio link