Re: [dpdk-dev] [PATCH v9 15/15] vhost: advertize packed ring layout support

[Tiwei Bie <tiwei.bie@intel.com>]

On Fri, Jul 06, 2018 at 09:07:22AM +0200, Maxime Coquelin wrote:
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  lib/librte_vhost/vhost.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
> index 760a09c0d..9b0ebb754 100644
> --- a/lib/librte_vhost/vhost.h
> +++ b/lib/librte_vhost/vhost.h
> @@ -275,7 +275,8 @@ struct vring_packed_desc_event {
>  				(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
>  				(1ULL << VIRTIO_NET_F_MTU)  | \
>  				(1ULL << VIRTIO_F_IN_ORDER) | \
> -				(1ULL << VIRTIO_F_IOMMU_PLATFORM))
> +				(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
> +				(1ULL << VIRTIO_F_RING_PACKED))
>  
>  
>  struct guest_page {
> -- 
> 2.14.4
> 

I didn't apply this patch, because the packed ring
support isn't complete, e.g. when doing live migration,
the wrap counter isn't synced. We can advertise this
feature bit when it's fully supported.