[dpdk-dev] [PATCH] vhost: fix dequeue zero copy not work with virtio1

[Loftus, Ciara]

> 
> Hi Junjie,
> 
> On 12/13/2017 05:50 PM, Junjie Chen wrote:
> > This fix dequeue zero copy can not work with Qemu
> > version >= 2.7. Since from Qemu 2.7 virtio device
> > use virtio-1 protocol, the zero copy code path
> > forget to add offset to buffer address.
> >
> > Signed-off-by: Junjie Chen <junjie.j.chen at intel.com>
> > ---
> >   lib/librte_vhost/virtio_net.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> > index 6fee16e..79d80f7 100644
> > --- a/lib/librte_vhost/virtio_net.c
> > +++ b/lib/librte_vhost/virtio_net.c
> > @@ -977,7 +977,8 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct
> vhost_virtqueue *vq,
> >   					desc->addr + desc_offset,
> cpy_len)))) {
> >   			cur->data_len = cpy_len;
> >   			cur->data_off = 0;
> > -			cur->buf_addr = (void *)(uintptr_t)desc_addr;
> > +			cur->buf_addr = (void *)(uintptr_t)(desc_addr
> > +				+ desc_offset);
> >   			cur->buf_iova = hpa;
> >
> >   			/*
> >
> 
> Thanks for fixing this.
> 
> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> 
> Maxime

Thanks for the fix. Can this be considered for the stable branch?

Thanks,
Ciara