PPPoE usses a midchain adjacency stack on an interface-tx DPO

1) introduce an interface-tx DPO. This is a simple wrapper around a sw_if_index. enhance DPO stacking functions to allow per-instance next-nodes and hence allow children to stack onto the interface per-instance tx node and not on 'interface-output'.
2) update PPPoE code to use ta midchain stack on a interface-tx DPO of the encap-interface. This remove the need for pppoe_encap node (which is replaced by the adj-midchain-tx) and interface-output node is no longer used (see above). Since PPPoE encap node is no longer needed, the PPPoE seesion does not need to be retrieved in the data-path, hence the cahce misses are removed.

Change-Id: Id8b40f53daa14889a9c51d802e14fed7fba4399a
Signed-off-by: Neale Ranns <nranns@cisco.com>

2 files changed, 14 insertions, 14 deletions

diff --git a/src/vnet/fib/fib_path.c b/src/vnet/fib/fib_path.c
index 58050ccb..cf5a463d 100644
--- a/src/vnet/fib/fib_path.c
+++ b/src/vnet/fib/fib_path.c
@@ -21,7 +21,7 @@
 #include <vnet/dpo/receive_dpo.h>
 #include <vnet/dpo/load_balance_map.h>
 #include <vnet/dpo/lookup_dpo.h>
-#include <vnet/dpo/interface_dpo.h>
+#include <vnet/dpo/interface_rx_dpo.h>
 #include <vnet/dpo/mpls_disposition.h>
 
 #include <vnet/adj/adj.h>
@@ -1707,9 +1707,9 @@ fib_path_resolve (fib_node_index_t path_index)
 	/*
 	 * Resolve via a receive DPO.
 	 */
-	interface_dpo_add_or_lock(path->fp_nh_proto,
-                                  path->intf_rx.fp_interface,
-                                  &path->fp_dpo);
+	interface_rx_dpo_add_or_lock(path->fp_nh_proto,
+                                     path->intf_rx.fp_interface,
+                                     &path->fp_dpo);
 	break;
     }
     case FIB_PATH_TYPE_EXCLUSIVE:
@@ -2041,9 +2041,9 @@ fib_path_contribute_forwarding (fib_node_index_t path_index,
             /*
              * Create the adj needed for sending IP multicast traffic
              */
-            interface_dpo_add_or_lock(fib_forw_chain_type_to_dpo_proto(fct),
-                                      path->attached.fp_interface,
-                                      dpo);
+            interface_rx_dpo_add_or_lock(fib_forw_chain_type_to_dpo_proto(fct),
+                                         path->attached.fp_interface,
+                                         dpo);
             break;
         case FIB_PATH_TYPE_RECEIVE:
         case FIB_PATH_TYPE_SPECIAL:
diff --git a/src/vnet/fib/fib_test.c b/src/vnet/fib/fib_test.c
index 7ca4cb3a..6867cca8 100644
--- a/src/vnet/fib/fib_test.c
+++ b/src/vnet/fib/fib_test.c
@@ -25,7 +25,7 @@
 #include <vnet/dpo/receive_dpo.h>
 #include <vnet/dpo/ip_null_dpo.h>
 #include <vnet/bfd/bfd_main.h>
-#include <vnet/dpo/interface_dpo.h>
+#include <vnet/dpo/interface_rx_dpo.h>
 #include <vnet/dpo/replicate_dpo.h>
 
 #include <vnet/mpls/mpls.h>
@@ -407,7 +407,7 @@ fib_test_validate_rep_v (const replicate_t *rep,
 	    }
 	    break;
 	case FT_REP_INTF:
-            FIB_TEST_LB((DPO_INTERFACE == dpo->dpoi_type),
+            FIB_TEST_LB((DPO_INTERFACE_RX == dpo->dpoi_type),
                         "bucket %d stacks on %U",
                         bucket,
                         format_dpo_type, dpo->dpoi_type);
@@ -589,7 +589,7 @@ fib_test_validate_lb_v (const load_balance_t *lb,
 			exp->adj.adj);
 	    break;
 	case FT_LB_INTF:
-	    FIB_TEST_I((DPO_INTERFACE == dpo->dpoi_type),
+	    FIB_TEST_I((DPO_INTERFACE_RX == dpo->dpoi_type),
 		       "bucket %d stacks on %U",
 		       bucket,
 		       format_dpo_type, dpo->dpoi_type);
@@ -8523,7 +8523,7 @@ lfib_test (void)
      */
     dpo_id_t idpo = DPO_INVALID;
 
-    interface_dpo_add_or_lock(DPO_PROTO_IP4,
+    interface_rx_dpo_add_or_lock(DPO_PROTO_IP4,
                               tm->hw[0]->sw_if_index,
                               &idpo);
 
@@ -8667,9 +8667,9 @@ lfib_test (void)
     FIB_TEST(lb_count == pool_elts(load_balance_pool),
 	     "Load-balance resources freed %d of %d",
              lb_count, pool_elts(load_balance_pool));
-    FIB_TEST(0 == pool_elts(interface_dpo_pool),
-	     "interface_dpo resources freed %d of %d",
-             0, pool_elts(interface_dpo_pool));
+    FIB_TEST(0 == pool_elts(interface_rx_dpo_pool),
+	     "interface_rx_dpo resources freed %d of %d",
+             0, pool_elts(interface_rx_dpo_pool));
 
     return (0);
 }