Tracing enhancements.

Limit buffer tracing to 50 in order to limit large output, unless
the user over rides the max "sh trace max <number>".

Add trace filtering, to be able to only trace packets that were
processed by a specific node or exclude packets processed by a node.
Example, only include packets processed by error-drop:
  # trace filter include error-drop 1
  # trace add dpdk-input 1000000
  <wait for packets, to come in>
  # show trace

Change-Id: I5d9e15d2268ea55e6ef87b2b8756049c49b2791b
Signed-off-by: Todd Foggoa <tfoggoa@cisco.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/vlib/vlib/trace.h b/vlib/vlib/trace.h
index 228a22abb95..50e51638fdb 100644
--- a/vlib/vlib/trace.h
+++ b/vlib/vlib/trace.h
@@ -68,6 +68,14 @@ typedef struct {
   /* Pool of trace buffers. */
   vlib_trace_header_t ** trace_buffer_pool;
 
+  u32 last_main_loop_count;
+  u32 filter_node_index;
+  u32 filter_flag;
+#define FILTER_FLAG_NONE    0
+#define FILTER_FLAG_INCLUDE 1
+#define FILTER_FLAG_EXCLUDE 2
+  u32 filter_count;
+
   /* Per node trace counts. */
   vlib_trace_node_t * nodes;
 } vlib_trace_main_t;