X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fsrmpls%2Fsr_mpls_policy.c;h=f94a8e945ec5d6351b749f924dce49cb123719cc;hb=da8e1802625bd5d6e9901d5a96106e6de4f3d71f;hp=8fc7e730e471de7f8a9bba623d5ec9bff9ceb230;hpb=0e88e851e058f4fb7cc690dbbdb19216ab360d1c;p=vpp.git

diff --git a/src/vnet/srmpls/sr_mpls_policy.c b/src/vnet/srmpls/sr_mpls_policy.c
index 8fc7e730e47..f94a8e945ec 100755
--- a/src/vnet/srmpls/sr_mpls_policy.c
+++ b/src/vnet/srmpls/sr_mpls_policy.c
@@ -159,6 +159,10 @@ sr_mpls_policy_add (mpls_label_t bsid, mpls_label_t * segments,
   if (!sm->sr_policies_index_hash)
     sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
 
+  /* MPLS SR policies cannot be created unless the MPLS table is present */
+  if (~0 == fib_table_find (FIB_PROTOCOL_MPLS, MPLS_FIB_DEFAULT_TABLE_ID))
+    return (VNET_API_ERROR_NO_SUCH_TABLE);
+
   /* Search for existing keys (BSID) */
   p = hash_get (sm->sr_policies_index_hash, bsid);
   if (p)
@@ -169,6 +173,13 @@ sr_mpls_policy_add (mpls_label_t bsid, mpls_label_t * segments,
   /* Add an SR policy object */
   pool_get (sm->sr_policies, sr_policy);
   memset (sr_policy, 0, sizeof (*sr_policy));
+
+  /* the first policy needs to lock the MPLS table so it doesn't
+   * disappear with policies in it */
+  if (1 == pool_elts (sm->sr_policies))
+    fib_table_find_or_create_and_lock (FIB_PROTOCOL_MPLS,
+				       MPLS_FIB_DEFAULT_TABLE_ID,
+				       FIB_SOURCE_SR);
   sr_policy->bsid = bsid;
   sr_policy->type = behavior;
   sr_policy->endpoint_type = 0;
@@ -261,6 +272,10 @@ sr_mpls_policy_del (mpls_label_t bsid)
   hash_unset (sm->sr_policies_index_hash, sr_policy->bsid);
   pool_put (sm->sr_policies, sr_policy);
 
+  if (0 == pool_elts (sm->sr_policies))
+    fib_table_unlock (MPLS_FIB_DEFAULT_TABLE_ID,
+		      FIB_PROTOCOL_MPLS, FIB_SOURCE_SR);
+
   return 0;
 }
 
@@ -545,6 +560,8 @@ sr_mpls_policy_command_fn (vlib_main_t * vm, unformat_input_t * input,
       return clib_error_return (0,
 				"Could not modify the segment list. "
 				"The given SL is not associated with such SR policy.");
+    case VNET_API_ERROR_NO_SUCH_TABLE:
+      return clib_error_return (0, "the Default MPLS table is not present");
     default:
       return clib_error_return (0, "BUG: sr policy returns %d", rv);
     }