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

4 files changed, 19 insertions, 4 deletions

diff --git a/src/vnet/mpls/mpls.api b/src/vnet/mpls/mpls.api
index 920479eff6c..25aa1c645af 100644
--- a/src/vnet/mpls/mpls.api
+++ b/src/vnet/mpls/mpls.api
@@ -46,9 +46,11 @@ typedef mpls_tunnel
   u32 mt_tunnel_index;
   bool mt_l2_only;
   bool mt_is_multicast;
+  string mt_tag[64];
   u8 mt_n_paths;
   vl_api_fib_path_t mt_paths[mt_n_paths];
 };
+
 define mpls_tunnel_add_del
 {
   u32 client_index;
diff --git a/src/vnet/mpls/mpls_api.c b/src/vnet/mpls/mpls_api.c
index 0185e373a41..70e8872317a 100644
--- a/src/vnet/mpls/mpls_api.c
+++ b/src/vnet/mpls/mpls_api.c
@@ -283,7 +283,8 @@ vl_api_mpls_tunnel_add_del_t_handler (vl_api_mpls_tunnel_add_del_t * mp)
       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 @@ send_mpls_tunnel_entry (u32 mti, void *arg)
   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);
diff --git a/src/vnet/mpls/mpls_tunnel.c b/src/vnet/mpls/mpls_tunnel.c
index 3ed77e63a6a..55d814858c3 100644
--- a/src/vnet/mpls/mpls_tunnel.c
+++ b/src/vnet/mpls/mpls_tunnel.c
@@ -606,7 +606,8 @@ vnet_mpls_tunnel_del (u32 sw_if_index)
 
 u32
 vnet_mpls_tunnel_create (u8 l2_only,
-                         u8 is_multicast)
+                         u8 is_multicast,
+                         u8 *tag)
 {
     vnet_hw_interface_t * hi;
     mpls_tunnel_t *mt;
@@ -625,6 +626,10 @@ vnet_mpls_tunnel_create (u8 l2_only,
         mt->mt_flags |= MPLS_TUNNEL_FLAG_MCAST;
     if (l2_only)
         mt->mt_flags |= MPLS_TUNNEL_FLAG_L2;
+    if (tag)
+        memcpy(mt->mt_tag, tag, sizeof(mt->mt_tag));
+    else
+        mt->mt_tag[0] = '\0';
 
     /*
      * Create a new tunnel HW interface
@@ -858,7 +863,7 @@ vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
 
         if (~0 == sw_if_index)
         {
-            sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast);
+            sw_if_index = vnet_mpls_tunnel_create(l2_only, is_multicast, NULL);
         }
         vnet_mpls_tunnel_path_add(sw_if_index, rpaths);
     }
diff --git a/src/vnet/mpls/mpls_tunnel.h b/src/vnet/mpls/mpls_tunnel.h
index 5685a0d8d6c..11a461b7b57 100644
--- a/src/vnet/mpls/mpls_tunnel.h
+++ b/src/vnet/mpls/mpls_tunnel.h
@@ -65,6 +65,11 @@ typedef struct mpls_tunnel_t_
     mpls_tunnel_flags_t mt_flags;
 
     /**
+     * @brief User defined name tag for this MPLS Tunnel.
+     */
+    u8 mt_tag[64];
+
+    /**
      * @brief If the tunnel is an L2 tunnel, this is the link type ETHERNET
      * load-balance
      */
@@ -101,7 +106,8 @@ typedef struct mpls_tunnel_t_
  * @return the SW Interface index of the newly created tuneel
  */
 extern u32 vnet_mpls_tunnel_create (u8 l2_only,
-                                    u8 is_multicast);
+                                    u8 is_multicast,
+                                    u8 *description);
 
 /**
  * @brief Add a path to an MPLS tunnel