Re: [Qemu-devel] [[RFC v3 12/12] virtio: feature vhost-net support for packed ring

[Wei Xu <wexu@redhat.com>]

On Wed, Nov 21, 2018 at 02:03:59PM +0100, Maxime Coquelin wrote:
> Hi Wei,
> 
> On 10/11/18 4:08 PM, wexu@redhat.com wrote:
> >From: Wei Xu <wexu@redhat.com>
> >
> >(cherry picked from commit 305a2c4640c15c5717245067ab937fd10f478ee6)
> >Signed-off-by: Wei Xu <wexu@redhat.com>
> >(cherry picked from commit 46476dae6f44c6fef8802a4a0ac7d0d79fe399e3)
> >Signed-off-by: Wei Xu <wexu@redhat.com>
> >---
> >  hw/virtio/vhost.c          | 3 +++
> >  hw/virtio/virtio.c         | 4 ++++
> >  include/hw/virtio/virtio.h | 1 +
> >  3 files changed, 8 insertions(+)
> >
> >diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> >index 9df2da3..de06d55 100644
> >--- a/hw/virtio/vhost.c
> >+++ b/hw/virtio/vhost.c
> >@@ -974,6 +974,9 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
> >      }
> >      state.num = virtio_queue_get_last_avail_idx(vdev, idx);
> >+    if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
> >+        state.num |= ((int)virtio_queue_packed_get_wc(vdev, idx)) << 31;
> 
> For next version, please note that we agreed to move the wrap counter
> value at bit 15. DPDK vhost lib implemented it that way.

Yes, I have revised it in my next version, thanks for remindering.

>