vlib: fix trace number accounting

[vpp.git] / src / vnet / devices / virtio / node.c

diff --git a/src/vnet/devices/virtio/node.c b/src/vnet/devices/virtio/node.c
index 94bf097..91e788e 100644 (file)
--- a/src/vnet/devices/virtio/node.c
+++ b/src/vnet/devices/virtio/node.c
@@ -388,11 +388,10 @@ virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
          /* trace */
          VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
 
-         if (PREDICT_FALSE (n_trace > 0))
+         if (PREDICT_FALSE (n_trace > 0 && vlib_trace_buffer (vm, node, next0, b0,     /* follow_chain */
+                                                              1)))
            {
              virtio_input_trace_t *tr;
-             vlib_trace_buffer (vm, node, next0, b0,
-                                /* follow_chain */ 1);
              vlib_set_trace_count (vm, node, --n_trace);
              tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
              tr->next_index = next0;