Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

[Yu Zhao]

Rusty Russell wrote:
> On Friday 07 November 2008 18:17:54 Zhao, Yu wrote:
> > Greg KH wrote:
> > > On Thu, Nov 06, 2008 at 04:40:21PM -0600, Anthony Liguori wrote:
> > >> Greg KH wrote:
> > >>> On Thu, Nov 06, 2008 at 10:47:41AM -0700, Matthew Wilcox wrote:
> > >>>> I don't think we really know what the One True Usage model is for VF
> > >>>> devices. Chris Wright has some ideas, I have some ideas and Yu Zhao
> > >>>> has some ideas. I bet there's other people who have other ideas too.
> > >>>
> > >>> I'd love to hear those ideas.
> > >>
> > >> We've been talking about avoiding hardware passthrough entirely and
> > >> just backing a virtio-net backend driver by a dedicated VF in the
> > >> host. That avoids a huge amount of guest-facing complexity, let's
> > >> migration Just Work, and should give the same level of performance.
> >
> > This can be commonly used not only with VF -- devices that have multiple
> > DMA queues (e.g., Intel VMDq, Neterion Xframe) and even traditional
> > devices can also take the advantage of this.
> >
> > CC Rusty Russel in case he has more comments.
>
> Yes, even dumb devices could use this mechanism if you wanted to bind an 
> entire device solely to one guest.
>
> We don't have network infrastructure for this today, but my thought was 
> to do something in dev_alloc_skb and dev_kfree_skb et al.

Is there any discussion about this on the netdev? Any prototype
available? If not, I'd like to create one and evaluate the performance
of virtio-net solution again the hardware passthrough.

Thanks,
Yu
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