[dpdk-stable] [PATCH 1/2] vhost: fix IOVA access for packed ring

[Tiwei Bie]

We should apply for RO access when receiving packets from the
VM and apply for RW access when sending packets to the VM.

Fixes: a922401f35cc ("vhost: add Rx support for packed ring")
Fixes: ae999ce49dcb ("vhost: add Tx support for packed ring")
Cc: stable at dpdk.org

Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
---
 lib/librte_vhost/virtio_net.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 8ad30c94a..5e1a1a727 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -598,7 +598,7 @@ reserve_avail_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 						avail_idx, &desc_count,
 						buf_vec, &vec_idx,
 						&buf_id, &len,
-						VHOST_ACCESS_RO) < 0))
+						VHOST_ACCESS_RW) < 0))
 			return -1;
 
 		len = RTE_MIN(len, size);
@@ -1503,7 +1503,7 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 						vq->last_avail_idx, &desc_count,
 						buf_vec, &nr_vec,
 						&buf_id, &dummy_len,
-						VHOST_ACCESS_RW) < 0))
+						VHOST_ACCESS_RO) < 0))
 			break;
 
 		if (likely(dev->dequeue_zero_copy == 0))
-- 
2.19.1