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

[Junjie Chen]

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;
 
 			/*
-- 
2.0.1