misc: add callback hooks and refactor pmc

Callbacks for monitoring and performance measurement:
- Add new callback list type, with context
- Add callbacks for API, CLI, and barrier sync
- Modify node dispatch callback to pass plugin-specific context
- Modify perfmon plugin to keep PMC samples local to the plugin
- Include process nodes in dispatch callback
- Pass dispatch function return value to callback

Type: refactor

Signed-off-by: Tom Seidenberg <tseidenb@cisco.com>
Change-Id: I28b06c58490611e08d76ff5b01b2347ba2109b22

1 files changed, 4 insertions, 0 deletions

diff --git a/src/vlib/node_funcs.h b/src/vlib/node_funcs.h
index 89f212374e9..dfeba17ab09 100644
--- a/src/vlib/node_funcs.h
+++ b/src/vlib/node_funcs.h
@@ -201,6 +201,10 @@ vlib_node_set_state (vlib_main_t * vm, u32 node_index,
       nm->input_node_counts_by_state[new_state] += 1;
     }
 
+  if (PREDICT_FALSE (r->state == VLIB_NODE_STATE_DISABLED))
+    vlib_node_runtime_perf_counter (vm, r, 0, 0, 0,
+				    VLIB_NODE_RUNTIME_PERF_RESET);
+
   n->state = new_state;
   r->state = new_state;
 }