Improve l2_macs_events API to provide MAC move information

Change mac_entry layout in l2_macs_event API message so the MAC
entry can be either add, delete or move where the sw_if_index of
an existing MAC entry changed. Also added a 8-bit flags field
in mac_entry for any future expansion.

Change-Id: I3bf9e1cf2556f2938202025a5d0772c2ce2fc99f
Signed-off-by: John Lo <loj@cisco.com>

4 files changed, 22 insertions, 8 deletions

diff --git a/src/vnet/l2/l2.api b/src/vnet/l2/l2.api
index 3fb6de0d073..0ff4a2d75e4 100644
--- a/src/vnet/l2/l2.api
+++ b/src/vnet/l2/l2.api
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-option version = "2.0.0";
+option version = "2.0.1";
 
 /** \brief Reply to l2_xconnect_dump 
     @param context - sender context which was passed in the request
@@ -158,14 +158,16 @@ autoreply define want_l2_macs_events
 /** \brief Entry for learned or aged MAC in L2 MAC Events
     @param sw_if_index - sw_if_index in the domain
     @param mac_addr - mac_address
-    @is_del - 0 => newly learned MAC, 1 => aged out MAC
+    @param action - 0 => newly learned MAC, 1 => MAC deleted by ager
+                    3 => MAC move (sw_if_index changed)
+    @param flags - flag bits to provide other info, not yet used
 */
 typeonly define mac_entry
 {
   u32 sw_if_index;
   u8  mac_addr[6];
-  u8  is_del;
-  u8  spare;
+  u8  action;
+  u8  flags;
 };
 
 /** \brief L2 MAC event for a list of learned or aged MACs
diff --git a/src/vnet/l2/l2_fib.c b/src/vnet/l2/l2_fib.c
index 55cffc8047c..99d99c57f73 100644
--- a/src/vnet/l2/l2_fib.c
+++ b/src/vnet/l2/l2_fib.c
@@ -1037,11 +1037,13 @@ l2fib_scan (vlib_main_t * vm, f64 start_time, u8 event_only)
 		      /* copy mac entry to event msg */
 		      clib_memcpy (mp->mac[evt_idx].mac_addr, key.fields.mac,
 				   6);
-		      mp->mac[evt_idx].is_del = 0;
+		      mp->mac[evt_idx].action = result.fields.lrn_mov ?
+			MAC_EVENT_ACTION_MOVE : MAC_EVENT_ACTION_ADD;
 		      mp->mac[evt_idx].sw_if_index =
 			htonl (result.fields.sw_if_index);
-		      /* clear event bit and update mac entry */
+		      /* clear event bits and update mac entry */
 		      result.fields.lrn_evt = 0;
+		      result.fields.lrn_mov = 0;
 		      BVT (clib_bihash_kv) kv;
 		      kv.key = key.raw;
 		      kv.value = result.raw;
@@ -1078,7 +1080,7 @@ l2fib_scan (vlib_main_t * vm, f64 start_time, u8 event_only)
 		{
 		  /* copy mac entry to event msg */
 		  clib_memcpy (mp->mac[evt_idx].mac_addr, key.fields.mac, 6);
-		  mp->mac[evt_idx].is_del = 1;
+		  mp->mac[evt_idx].action = MAC_EVENT_ACTION_DELETE;
 		  mp->mac[evt_idx].sw_if_index =
 		    htonl (result.fields.sw_if_index);
 		  evt_idx++;
diff --git a/src/vnet/l2/l2_fib.h b/src/vnet/l2/l2_fib.h
index 60c197f2a57..ad7035bff54 100644
--- a/src/vnet/l2/l2_fib.h
+++ b/src/vnet/l2/l2_fib.h
@@ -118,7 +118,8 @@ typedef struct
       u8 bvi:1;			/* mac is for a bridged virtual interface */
       u8 filter:1;		/* drop packets to/from this mac */
       u8 lrn_evt:1;		/* MAC learned to be sent in L2 MAC event */
-      u8 unused:3;
+      u8 lrn_mov:1;		/* MAC learned is a MAC move */
+      u8 unused:2;
 
       u8 timestamp;		/* timestamp for aging */
       l2fib_seq_num_t sn;	/* bd/int seq num */
@@ -129,6 +130,14 @@ typedef struct
 
 STATIC_ASSERT_SIZEOF (l2fib_entry_result_t, 8);
 
+/* L2 MAC event entry action enums (see mac_entry definition in l2.api) */
+typedef enum
+{
+  MAC_EVENT_ACTION_ADD = 0,
+  MAC_EVENT_ACTION_DELETE = 1,
+  MAC_EVENT_ACTION_MOVE = 2,
+} l2_mac_event_action_t;
+
 /**
  * Compute the hash for the given key and return
  * the corresponding bucket index
diff --git a/src/vnet/l2/l2_learn.c b/src/vnet/l2/l2_learn.c
index 6ece1a3c7f2..04e0721ebeb 100644
--- a/src/vnet/l2/l2_learn.c
+++ b/src/vnet/l2/l2_learn.c
@@ -207,6 +207,7 @@ l2learn_process (vlib_node_runtime_t * node,
 	  result0->fields.age_not = 0;
 	}
       result0->fields.lrn_evt = (msm->client_pid != 0);
+      result0->fields.lrn_mov = (msm->client_pid != 0);
       counter_base[L2LEARN_ERROR_MAC_MOVE] += 1;
     }