Re: [virtio-dev] [PATCH v8] virtio_net: support for split transport header

[Jason Wang <jasowang@redhat.com>]

On Wed, Sep 28, 2022 at 9:39 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Mon, Sep 26, 2022 at 04:06:17PM +0800, Jason Wang wrote:
> > > Jason I think the issue with previous proposals is that they conflict
> > > with VIRTIO_F_ANY_LAYOUT. We have repeatedly found that giving the
> > > driver flexibility in arranging the packet in memory is benefitial.
> >
> >
> > Yes, but I didn't found how it can conflict the any_layout. Device can just
> > to not split the header when the layout doesn't fit for header splitting.
> > (And this seems the case even if we're using buffers).
>
> Well spec says:
>
>         indicates to both the device and the driver that no
>         assumptions were made about framing.
>
> if device assumes that descriptor boundaries are where
> driver wants packet to be stored that is clearly
> an assumption.

Yes but what I want to say is, the device can choose to not split the
packet if the framing doesn't fit. Does it still comply with the above
description?

Thanks

>
>
> --
> MST
>