vlib: fix trace number accounting

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

diff --git a/src/plugins/avf/input.c b/src/plugins/avf/input.c
index 9d677ab..4e4f116 100644 (file)
--- a/src/plugins/avf/input.c
+++ b/src/plugins/avf/input.c
@@ -383,20 +383,24 @@ no_more_desc:
 
       while (n_trace && n_left)
        {
-         vlib_buffer_t *b;
-         avf_input_trace_t *tr;
-         b = vlib_get_buffer (vm, bi[0]);
-         vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */ 0);
-         tr = vlib_add_trace (vm, node, b, sizeof (*tr));
-         tr->next_index = next_index;
-         tr->qid = qid;
-         tr->hw_if_index = ad->hw_if_index;
-         tr->qw1s[0] = ptd->qw1s[i];
-         for (j = 1; j < AVF_RX_MAX_DESC_IN_CHAIN; j++)
-           tr->qw1s[j] = ptd->tails[i].qw1s[j - 1];
+         vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
+         if (PREDICT_TRUE
+             (vlib_trace_buffer
+              (vm, node, next_index, b, /* follow_chain */ 0)))
+           {
+             avf_input_trace_t *tr =
+               vlib_add_trace (vm, node, b, sizeof (*tr));
+             tr->next_index = next_index;
+             tr->qid = qid;
+             tr->hw_if_index = ad->hw_if_index;
+             tr->qw1s[0] = ptd->qw1s[i];
+             for (j = 1; j < AVF_RX_MAX_DESC_IN_CHAIN; j++)
+               tr->qw1s[j] = ptd->tails[i].qw1s[j - 1];
+
+             n_trace--;
+           }
 
          /* next */
-         n_trace--;
          n_left--;
          bi++;
          i++;