ip: do policer thread handoff from punt policers

Pass packets arriving at the ip[46] punt policer nodes to punt policer
handoff nodes if the worker thread they arrive on is not the same one
configured in the policer. Initially, the policer will be tied to the
worker thread that it first received a packet on. This will be expanded
in future to be a configuration API option.

Type: improvement
Signed-off-by: Brian Russell <brian@graphiant.com>
Change-Id: Ic39d936084c354af1859ad3d946da6cd0f6e34d9

1 files changed, 24 insertions, 0 deletions

diff --git a/src/vnet/ip/ip4_punt_drop.c b/src/vnet/ip/ip4_punt_drop.c
index 94c260acc57..20430adb2f3 100644
--- a/src/vnet/ip/ip4_punt_drop.c
+++ b/src/vnet/ip/ip4_punt_drop.c
@@ -51,6 +51,29 @@ ip_punt_policer_t ip4_punt_policer_cfg = {
 };
 #endif /* CLIB_MARCH_VARIANT */
 
+static char *ip4_punt_policer_handoff_error_strings[] = { "congestion drop" };
+
+VLIB_NODE_FN (ip4_punt_policer_handoff_node)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
+{
+  return policer_handoff (vm, node, frame, ip4_punt_policer_cfg.fq_index,
+			  ip4_punt_policer_cfg.policer_index);
+}
+
+VLIB_REGISTER_NODE (ip4_punt_policer_handoff_node) = {
+  .name = "ip4-punt-policer-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_policer_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(ip4_punt_policer_handoff_error_strings),
+  .error_strings = ip4_punt_policer_handoff_error_strings,
+
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+
 static char *ip4_punt_policer_error_strings[] = {
 #define _(sym,string) string,
   foreach_ip_punt_policer_error
@@ -77,6 +100,7 @@ VLIB_REGISTER_NODE (ip4_punt_policer_node) = {
 
   .next_nodes = {
     [IP_PUNT_POLICER_NEXT_DROP] = "ip4-drop",
+    [IP_PUNT_POLICER_NEXT_HANDOFF] = "ip4-punt-policer-handoff",
   },
 };