vhost: fix ring index returned to master on stop

According to the "Vhost-user Protocol" document,
VHOST_USER_GET_VRING_BASE should get the available vring base offset.

Fixes: 8f972312b8f4 ("vhost: support vhost-user")
Cc: stable@dpdk.org
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
Reviewed-by: Jianfeng Tan <jianfeng.tan@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 4b4b757..5c53610 100644 (file)
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -942,8 +942,8 @@ vhost_user_get_vring_base(struct virtio_net *dev,
 
        dev->flags &= ~VIRTIO_DEV_READY;
 
-       /* Here we are safe to get the last used index */
-       msg->payload.state.num = vq->last_used_idx;
+       /* Here we are safe to get the last avail index */
+       msg->payload.state.num = vq->last_avail_idx;
 
        RTE_LOG(INFO, VHOST_CONFIG,
                "vring base idx:%d file:%d\n", msg->payload.state.index,