Fix SR multicast post mfib commit

 1 - use the SR policy to construct the replicate DPO. Each bucket therein is a SR tunnel.
 2 - install a special mfib entry that links via this replicate
 3 - forwarding is now mfib-lookup -> replicate -> sr_rewrite (per-tunnel)
        no need for a separate sr_replicate node.
 4 - Stack the sr tunnel on the forwarding DPO of the first-hop FIB entry.
        no need for a second lookup post SR encap.
 5 - fix some path-list lock leaks in the MFIB entry.

Change-Id: I20de96ea4c4be4fae252625bde159d9c435c8315
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/vnet/mfib/mfib_table.h b/src/vnet/mfib/mfib_table.h
index 4faa69ee999..4c51b70fd72 100644
--- a/src/vnet/mfib/mfib_table.h
+++ b/src/vnet/mfib/mfib_table.h
@@ -18,6 +18,7 @@
 
 #include <vnet/ip/ip.h>
 #include <vnet/adj/adj.h>
+#include <vnet/dpo/replicate_dpo.h>
 
 #include <vnet/mfib/mfib_types.h>
 
@@ -214,6 +215,37 @@ extern void mfib_table_entry_delete_index(fib_node_index_t entry_index,
 
 /**
  * @brief
+ *  Add a 'special' entry to the mFIB that links to the DPO passed
+ *  A special entry is an entry that the FIB is not expect to resolve
+ *  via the usual mechanisms (i.e. recurisve or neighbour adj DB lookup).
+ *  Instead the client/source provides the index of a replicate DPO to link to.
+ *
+  * @param fib_index
+ *  The index of the FIB
+ *
+ * @param prefix
+ *  The prefix to add
+ *
+ * @param source
+ *  The ID of the client/source adding the entry.
+ *
+ * @param flags
+ *  Flags for the entry.
+ *
+ * @param rep_dpo
+ *  The replicate DPO index to link to.
+ *
+ * @return
+ *  the index of the fib_entry_t that is created (or existed already).
+ */
+extern fib_node_index_t mfib_table_entry_special_add(u32 fib_index,
+                                                     const mfib_prefix_t *prefix,
+                                                     mfib_source_t source,
+                                                     mfib_entry_flags_t flags,
+                                                     index_t rep_dpo);
+
+/**
+ * @brief
  *  Flush all entries from a table for the source
  *
  * @param fib_index