vlib: fix trace number accounting

[vpp.git] / src / vnet / interface_output.c

diff --git a/src/vnet/interface_output.c b/src/vnet/interface_output.c
index 52c07ac..65bc4a4 100644 (file)
--- a/src/vnet/interface_output.c
+++ b/src/vnet/interface_output.c
@@ -800,19 +800,21 @@ interface_drop_punt (vlib_main_t * vm,
          node->flags |= VLIB_NODE_FLAG_TRACE;
          while (n_trace && n_left)
            {
-             vlib_trace_buffer (vm, node, 0 /* next_index */ ,
-                                b[0], 0 /* follow chain */ );
-             /*
-              * Here we have a wireshark dissector problem.
-              * Packets may be well-formed, or not. We
-              * must not blow chunks in any case.
-              *
-              * Try to produce trace records which will help
-              * folks understand what's going on.
-              */
-             drop_catchup_trace (vm, node, b[0]);
-
-             n_trace--;
+             if (PREDICT_TRUE
+                 (vlib_trace_buffer (vm, node, 0 /* next_index */ , b[0],
+                                     0 /* follow chain */ )))
+               {
+                 /*
+                  * Here we have a wireshark dissector problem.
+                  * Packets may be well-formed, or not. We
+                  * must not blow chunks in any case.
+                  *
+                  * Try to produce trace records which will help
+                  * folks understand what's going on.
+                  */
+                 drop_catchup_trace (vm, node, b[0]);
+                 n_trace--;
+               }
              n_left--;
              b++;
            }