Re: Regarding VIRTIO_F_IN_ORDER and VIRTIO_F_NOTIFICATION_DATA feature bits

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Dec 13, 2023 at 04:27:40PM +0000, Srujana Challa wrote:
> Hi Michael,
> 
> While verifying virtio frontend drivers of guest OS on qemu with vhost-vdpa backend,
> we came across feature bits VIRTIO_F_IN_ORDER and VIRTIO_F_NOTIFICATION_DATA,
> which are introduced in virtio 1.1 spec, are not yet enabled in qemu. These feature flags
> are very much useful for achieving better virtio-net performance and most of the latest
> hardware VDPA devices supports these feature flags as per of virtio spec.

Could you share more about which device do you mean? Does Marvell ship
or intends to ship one?

> Could you let us know if there are any plans, to add support for these features in upcoming
> qemu releases.
> I guess there was some discussion on VIRTIO_F_IN_ORDER feature bit long ago,
> https://patchew.org/QEMU/1533833677-27512-1-git-send-email-i.maximets@samsung.com/
> Seems like that discussion has not reached any conclusion or further work.
> 
> Thanks,
> Srujana.

Yes that patch got comments and these were not addressed.
Feel free to address them so this can proceed.

-- 
MST