Add support for API client to receive L2 MAC events

Added APIs want_l2_macs_events and l2_macs_event to allow an API
client to receive notification events from VPP for MAC learned
or aged in L2FIB. Only one API client is allowed for L2 MAC events.

The want_l2_macs_events API allow caller to specify MAC learn
limit, event scan delay and max number of MACs that can be included
in a event message. These parameters should be choosen properly as
to not have too many MAC events sent by VPP and overwhelm the API
share memory. They can all be left as 0's so VPP will setup reasonable
defaults which are: 1000 learn limit, 100 msec scan delay and 100
MACs per event message.

If want_l2_macs_events is never called, VPP learning and aging
should behave as before except that MAC entries provisioned by API
or CLI will not be aged, even if it is not set as static_mac. These
non static MACs, however, can be overwritten by MAC learning on a
MAC move as a leared MAC. Only learned MACs are subject to aging.

Change-Id: Ia3757a80cf8adb2811a089d2eafbd6439461285c
Signed-off-by: John Lo <loj@cisco.com>

1 files changed, 79 insertions, 7 deletions

diff --git a/src/vat/api_format.c b/src/vat/api_format.c
index bbd97ba1..27286686 100644
--- a/src/vat/api_format.c
+++ b/src/vat/api_format.c
@@ -1283,6 +1283,30 @@ vl_api_ip6_nd_event_t_handler_json (vl_api_ip6_nd_event_t * mp)
   /* JSON output not supported */
 }
 
+static void
+vl_api_l2_macs_event_t_handler (vl_api_l2_macs_event_t * mp)
+{
+  u32 n_macs = ntohl (mp->n_macs);
+  errmsg ("L2MAC event recived with pid %d cl-idx %d for %d macs: \n",
+	  ntohl (mp->pid), mp->client_index, n_macs);
+  int i;
+  for (i = 0; i < n_macs; i++)
+    {
+      vl_api_mac_entry_t *mac = &mp->mac[i];
+      errmsg (" [%d] sw_if_index %d  mac_addr %U  is_del %d \n",
+	      i + 1, ntohl (mac->sw_if_index),
+	      format_ethernet_address, mac->mac_addr, mac->is_del);
+      if (i == 1000)
+	break;
+    }
+}
+
+static void
+vl_api_l2_macs_event_t_handler_json (vl_api_l2_macs_event_t * mp)
+{
+  /* JSON output not supported */
+}
+
 #define vl_api_bridge_domain_details_t_endian vl_noop_handler
 #define vl_api_bridge_domain_details_t_print vl_noop_handler
 
@@ -4597,6 +4621,7 @@ _(modify_vhost_user_if_reply)                           \
 _(delete_vhost_user_if_reply)                           \
 _(want_ip4_arp_events_reply)                            \
 _(want_ip6_nd_events_reply)                             \
+_(want_l2_macs_events_reply)                            \
 _(input_acl_set_interface_reply)                        \
 _(ipsec_spd_add_del_reply)                              \
 _(ipsec_interface_add_del_spd_reply)                    \
@@ -4813,6 +4838,8 @@ _(WANT_IP4_ARP_EVENTS_REPLY, want_ip4_arp_events_reply)			\
 _(IP4_ARP_EVENT, ip4_arp_event)                                         \
 _(WANT_IP6_ND_EVENTS_REPLY, want_ip6_nd_events_reply)			\
 _(IP6_ND_EVENT, ip6_nd_event)						\
+_(WANT_L2_MACS_EVENTS_REPLY, want_l2_macs_events_reply)			\
+_(L2_MACS_EVENT, l2_macs_event)						\
 _(INPUT_ACL_SET_INTERFACE_REPLY, input_acl_set_interface_reply)         \
 _(IP_ADDRESS_DETAILS, ip_address_details)                               \
 _(IP_DETAILS, ip_details)                                               \
@@ -6607,8 +6634,9 @@ api_l2_flags (vat_main_t * vam)
   unformat_input_t *i = vam->input;
   vl_api_l2_flags_t *mp;
   u32 sw_if_index;
-  u32 feature_bitmap = 0;
+  u32 flags = 0;
   u8 sw_if_index_set = 0;
+  u8 is_set = 0;
   int ret;
 
   /* Parse args required to build the message */
@@ -6628,13 +6656,19 @@ api_l2_flags (vat_main_t * vam)
 	    break;
 	}
       else if (unformat (i, "learn"))
-	feature_bitmap |= L2INPUT_FEAT_LEARN;
+	flags |= L2_LEARN;
       else if (unformat (i, "forward"))
-	feature_bitmap |= L2INPUT_FEAT_FWD;
+	flags |= L2_FWD;
       else if (unformat (i, "flood"))
-	feature_bitmap |= L2INPUT_FEAT_FLOOD;
+	flags |= L2_FLOOD;
       else if (unformat (i, "uu-flood"))
-	feature_bitmap |= L2INPUT_FEAT_UU_FLOOD;
+	flags |= L2_UU_FLOOD;
+      else if (unformat (i, "arp-term"))
+	flags |= L2_ARP_TERM;
+      else if (unformat (i, "off"))
+	is_set = 0;
+      else if (unformat (i, "disable"))
+	is_set = 0;
       else
 	break;
     }
@@ -6648,7 +6682,8 @@ api_l2_flags (vat_main_t * vam)
   M (L2_FLAGS, mp);
 
   mp->sw_if_index = ntohl (sw_if_index);
-  mp->feature_bitmap = ntohl (feature_bitmap);
+  mp->feature_bitmap = ntohl (flags);
+  mp->is_set = is_set;
 
   S (mp);
   W (ret);
@@ -12535,6 +12570,42 @@ api_want_ip6_nd_events (vat_main_t * vam)
 }
 
 static int
+api_want_l2_macs_events (vat_main_t * vam)
+{
+  unformat_input_t *line_input = vam->input;
+  vl_api_want_l2_macs_events_t *mp;
+  u8 enable_disable = 1;
+  u32 scan_delay = 0;
+  u32 max_macs_in_event = 0;
+  u32 learn_limit = 0;
+  int ret;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "learn-limit %d", &learn_limit))
+	;
+      else if (unformat (line_input, "scan-delay %d", &scan_delay))
+	;
+      else if (unformat (line_input, "max-entries %d", &max_macs_in_event))
+	;
+      else if (unformat (line_input, "disable"))
+	enable_disable = 0;
+      else
+	break;
+    }
+
+  M (WANT_L2_MACS_EVENTS, mp);
+  mp->enable_disable = enable_disable;
+  mp->pid = htonl (getpid ());
+  mp->learn_limit = htonl (learn_limit);
+  mp->scan_delay = (u8) scan_delay;
+  mp->max_macs_in_event = (u8) (max_macs_in_event / 10);
+  S (mp);
+  W (ret);
+  return ret;
+}
+
+static int
 api_input_acl_set_interface (vat_main_t * vam)
 {
   unformat_input_t *i = vam->input;
@@ -19831,7 +19902,7 @@ _(l2fib_add_del,                                                        \
 _(l2fib_flush_bd, "bd_id <bridge-domain-id>")                           \
 _(l2fib_flush_int, "<intfc> | sw_if_index <id>")                        \
 _(l2_flags,                                                             \
-  "sw_if <intfc> | sw_if_index <id> [learn] [forward] [uu-flood] [flood]\n") \
+  "sw_if <intfc> | sw_if_index <id> [learn] [forward] [uu-flood] [flood] [arp-term] [disable]\n") \
 _(bridge_flags,                                                         \
   "bd_id <bridge-domain-id> [learn] [forward] [uu-flood] [flood] [arp-term] [disable]\n") \
 _(tap_connect,                                                          \
@@ -19974,6 +20045,7 @@ _(input_acl_set_interface,                                              \
   "  [l2-table <nn>] [del]")                                            \
 _(want_ip4_arp_events, "address <ip4-address> [del]")                   \
 _(want_ip6_nd_events, "address <ip6-address> [del]")                    \
+_(want_l2_macs_events, "[disable] [learn-limit <n>] [scan-delay <n>] [max-entries <n>]") \
 _(ip_address_dump, "(ipv4 | ipv6) (<intfc> | sw_if_index <id>)")        \
 _(ip_dump, "ipv4 | ipv6")                                               \
 _(ipsec_spd_add_del, "spd_id <n> [del]")                                \