vhost: skip access lock when vDPA is configured

No need to take access lock in the vhost-user message handler when
vDPA driver controls all the data-path of the vhost device.

It allows the vDPA set_vring_state operation callback to configure
guest notifications.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index c08f506..4349506 100644 (file)
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2683,8 +2683,10 @@ vhost_user_msg_handler(int vid, int fd)
        case VHOST_USER_SEND_RARP:
        case VHOST_USER_NET_SET_MTU:
        case VHOST_USER_SET_SLAVE_REQ_FD:
-               vhost_user_lock_all_queue_pairs(dev);
-               unlock_required = 1;
+               if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
+                       vhost_user_lock_all_queue_pairs(dev);
+                       unlock_required = 1;
+               }
                break;
        default:
                break;