mpls: add user defined name tag to mpls tunnels

This allows a user creating MPLS tunnel through the bin_api to add a name tag. This is useful
to correlate the Tunnel with its use-case. Also useful if the user needs to recover the MPLS
Tunnel after a restart (mark-sweep).

Type: feature

Change-Id:

Signed-off-by: IJsbrand Wijnands <ice@cisco.com>
Change-Id: Idc080a63810a176ab090a2678a73d2cf9f7b523f
diff --git a/src/vnet/mpls/mpls_api.c b/src/vnet/mpls/mpls_api.c
index 0185e37..70e8872 100644
--- a/src/vnet/mpls/mpls_api.c
+++ b/src/vnet/mpls/mpls_api.c
@@ -283,7 +283,8 @@
       if (~0 == tunnel_sw_if_index)
 	tunnel_sw_if_index =
 	  vnet_mpls_tunnel_create (mp->mt_tunnel.mt_l2_only,
-				   mp->mt_tunnel.mt_is_multicast);
+				   mp->mt_tunnel.mt_is_multicast,
+				   mp->mt_tunnel.mt_tag);
       vnet_mpls_tunnel_path_add (tunnel_sw_if_index, rpaths);
 
       tunnel_index = vnet_mpls_tunnel_get_index (tunnel_sw_if_index);
@@ -365,6 +366,7 @@
   mp->mt_tunnel.mt_tunnel_index = ntohl (mti);
   mp->mt_tunnel.mt_l2_only = ! !(MPLS_TUNNEL_FLAG_L2 & mt->mt_flags);
   mp->mt_tunnel.mt_is_multicast = ! !(MPLS_TUNNEL_FLAG_MCAST & mt->mt_flags);
+  memcpy (mp->mt_tunnel.mt_tag, mt->mt_tag, sizeof (mp->mt_tunnel.mt_tag));
 
   fib_path_list_walk_w_ext (mt->mt_path_list,
 			    &mt->mt_path_exts, fib_path_encode, &path_ctx);