virtio: add missing tx lock when running multithreaded

Change-Id: I373f429c53c6f66ad38322addcfaccddb7761392
Signed-off-by: Damjan Marion <damarion@cisco.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
index ae8a116efee..c7efe6519cd 100644
--- a/src/vnet/devices/virtio/device.c
+++ b/src/vnet/devices/virtio/device.c
@@ -182,6 +182,8 @@ virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   u16 mask = sz - 1;
   u32 *buffers = vlib_frame_args (frame);
 
+  clib_spinlock_lock_if_init (&vif->lockp);
+
   /* free consumed buffers */
   virtio_free_used_desc (vm, vring);
 
@@ -221,6 +223,8 @@ virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       vlib_buffer_free (vm, buffers, n_left);
     }
 
+  clib_spinlock_unlock_if_init (&vif->lockp);
+
   return frame->n_vectors - n_left;
 }
 
diff --git a/src/vnet/devices/virtio/virtio.h b/src/vnet/devices/virtio/virtio.h
index 7ffb2ea3dce..5fc521672d9 100644
--- a/src/vnet/devices/virtio/virtio.h
+++ b/src/vnet/devices/virtio/virtio.h
@@ -91,6 +91,8 @@ typedef struct
 typedef struct
 {
   u32 flags;
+  clib_spinlock_t lockp;
+
   u32 id;
   u32 dev_instance;
   u32 hw_if_index;