fib: Don't back walk from a path-list when a child fist attaches.

Type: fix

If the walk is triggered when the child is added, then that child is visited in the walk. However, since it is just attahcing to the path-list it may not, or indeed cannot, have all the context it needs to successfully handle the walk.
In the case of MPLS tunnel, it does not have the path extensions ready, and cannot since the path extensions need to resolve on the path-list.

Signed-off-by: Neale Ranns <neale@graphiant.com>
Change-Id: I027af8cf2f522d2f6e37931bea60c767f0cb667d

1 files changed, 11 insertions, 1 deletions

diff --git a/test/test_mpls.py b/test/test_mpls.py
index 2c40e8d198e..2b959e48fb6 100644
--- a/test/test_mpls.py
+++ b/test/test_mpls.py
@@ -1069,7 +1069,7 @@ class TestMPLS(VppTestCase):
     def test_mpls_tunnel_many(self):
         """ MPLS Multiple Tunnels """
 
-        for ii in range(10):
+        for ii in range(100):
             mpls_tun = VppMPLSTunnelInterface(
                 self,
                 [VppRoutePath(self.pg0.remote_ip4,
@@ -1078,6 +1078,16 @@ class TestMPLS(VppTestCase):
                                       VppMplsLabel(46, MplsLspMode.UNIFORM)])])
             mpls_tun.add_vpp_config()
             mpls_tun.admin_up()
+        for ii in range(100):
+            mpls_tun = VppMPLSTunnelInterface(
+                self,
+                [VppRoutePath(self.pg0.remote_ip4,
+                              self.pg0.sw_if_index,
+                              labels=[VppMplsLabel(44, ttl=32),
+                                      VppMplsLabel(46, MplsLspMode.UNIFORM)])],
+                is_l2=1)
+            mpls_tun.add_vpp_config()
+            mpls_tun.admin_up()
 
     def test_v4_exp_null(self):
         """ MPLS V4 Explicit NULL test """