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

[vpp.git] / src / vnet / fib / fib_path_list.c

diff --git a/src/vnet/fib/fib_path_list.c b/src/vnet/fib/fib_path_list.c
index df08bb2..8175169 100644 (file)
--- a/src/vnet/fib/fib_path_list.c
+++ b/src/vnet/fib/fib_path_list.c
@@ -1297,22 +1297,15 @@ fib_path_list_child_add (fib_node_index_t path_list_index,
                         fib_node_type_t child_type,
                         fib_node_index_t child_index)
 {
-    u32 sibling;
-
-    sibling = fib_node_child_add(FIB_NODE_TYPE_PATH_LIST,
-                                 path_list_index,
-                                 child_type,
-                                 child_index);
-
-    if (FIB_PATH_LIST_POPULAR == fib_node_get_n_children(FIB_NODE_TYPE_PATH_LIST,
-                                                         path_list_index))
+    if (FIB_PATH_LIST_POPULAR - 1 == fib_node_get_n_children(FIB_NODE_TYPE_PATH_LIST,
+                                                             path_list_index))
     {
         /*
          * Set the popular flag on the path-list once we pass the magic
          * threshold. then walk children to update.
          * We don't undo this action. The rational being that the number
          * of entries using this prefix is large enough such that it is a
-         * non-trivial amount of effort to converge them. If we get into the
+         * non-trival amount of effort to converge them. If we get into the
          * situation where we are adding and removing entries such that we
          * flip-flop over the threshold, then this non-trivial work is added
          * to each of those routes adds/deletes - not a situation we want.
@@ -1328,7 +1321,10 @@ fib_path_list_child_add (fib_node_index_t path_list_index,
        fib_walk_sync(FIB_NODE_TYPE_PATH_LIST, path_list_index, &ctx);
     }
 
-    return (sibling);
+    return (fib_node_child_add(FIB_NODE_TYPE_PATH_LIST,
+                                 path_list_index,
+                                 child_type,
+                                 child_index));
 }
 
 void