vlib: fix trace number accounting

[vpp.git] / src / plugins / vmxnet3 / input.c

diff --git a/src/plugins/vmxnet3/input.c b/src/plugins/vmxnet3/input.c
index f182409..bed4c1e 100644 (file)
--- a/src/plugins/vmxnet3/input.c
+++ b/src/plugins/vmxnet3/input.c
@@ -418,17 +418,18 @@ vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       next = nexts;
       while (n_trace && n_left)
        {
-         vlib_buffer_t *b;
-         vmxnet3_input_trace_t *tr;
-
-         b = vlib_get_buffer (vm, bi[0]);
-         vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
-         tr = vlib_add_trace (vm, node, b, sizeof (*tr));
-         tr->next_index = next[0];
-         tr->hw_if_index = vd->hw_if_index;
-         tr->buffer = *b;
-
-         n_trace--;
+         vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
+         if (PREDICT_TRUE
+             (vlib_trace_buffer
+              (vm, node, next[0], b, /* follow_chain */ 0)))
+           {
+             vmxnet3_input_trace_t *tr =
+               vlib_add_trace (vm, node, b, sizeof (*tr));
+             tr->next_index = next[0];
+             tr->hw_if_index = vd->hw_if_index;
+             tr->buffer = *b;
+             n_trace--;
+           }
          n_left--;
          bi++;
          next++;