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, 21 insertions, 9 deletions

diff --git a/src/vnet/sr/sr.h b/src/vnet/sr/sr.h
index 610b36996f3..3c50b7358a1 100644
--- a/src/vnet/sr/sr.h
+++ b/src/vnet/sr/sr.h
@@ -15,8 +15,6 @@
 /**
  * @file
  * @brief Segment Routing header
- *
- * @note sr_replicate only works using DPDK today
  */
 #ifndef included_vnet_sr_h
 #define included_vnet_sr_h
@@ -71,6 +69,27 @@ typedef struct
   /** Indicates that this tunnel is part of a policy comprising
      of multiple tunnels. If == ~0 tunnel is not part of a policy */
   u32 policy_index;
+
+  /**
+   * The FIB node graph linkage
+   */
+  fib_node_t node;
+
+  /**
+   * The FIB entry index for the first hop. We track this so we
+   * don't need an extra lookup for it in the data plane
+   */
+  fib_node_index_t fib_entry_index;
+
+  /**
+   * This tunnel's sibling index in the children of the FIB entry
+   */
+  u32 sibling_index;
+
+  /**
+   * The DPO contributed by the first-hop FIB entry.
+   */
+  dpo_id_t first_hop_dpo;
 } ip6_sr_tunnel_t;
 
 /**
@@ -205,9 +224,6 @@ typedef struct
   /** ip6-rewrite next index for reinstalling the original dst address */
   u32 ip6_rewrite_sr_next_index;
 
-  /** ip6-replicate next index for multicast tunnel */
-  u32 ip6_lookup_sr_replicate_index;
-
   /** application API callback */
   void *sr_local_cb;
 
@@ -238,10 +254,6 @@ format_function_t format_ip6_sr_header_with_length;
 
 vlib_node_registration_t ip6_sr_input_node;
 
-#if DPDK > 0
-extern vlib_node_registration_t sr_replicate_node;
-#endif /* DPDK */
-
 int ip6_sr_add_del_tunnel (ip6_sr_add_del_tunnel_args_t * a);
 int ip6_sr_add_del_policy (ip6_sr_add_del_policy_args_t * a);
 int ip6_sr_add_del_multicastmap (ip6_sr_add_del_multicastmap_args_t * a);