fib: Support the POP of a Psuedo Wire Control Word

Type: feature

Change-Id: Ib24547a7c4c73ceb5383d1ca8f14ec40e6a90f01
Signed-off-by: Neale Ranns <nranns@cisco.com>

6 files changed, 35 insertions, 3 deletions

diff --git a/src/vnet/fib/fib_api.c b/src/vnet/fib/fib_api.c
index e776235bc00..e020b26fd6e 100644
--- a/src/vnet/fib/fib_api.c
+++ b/src/vnet/fib/fib_api.c
@@ -186,6 +186,8 @@ fib_api_path_decode (vl_api_fib_path_t *in,
         out->frp_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_HOST;
     if (in->flags & FIB_API_PATH_FLAG_RESOLVE_VIA_ATTACHED)
         out->frp_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED;
+    if (in->flags & FIB_API_PATH_FLAG_POP_PW_CW)
+        out->frp_flags |= FIB_ROUTE_PATH_POP_PW_CW;
 
     switch (in->type)
     {
diff --git a/src/vnet/fib/fib_path.c b/src/vnet/fib/fib_path.c
index eebba1b1548..ed7bc0262fc 100644
--- a/src/vnet/fib/fib_path.c
+++ b/src/vnet/fib/fib_path.c
@@ -26,6 +26,7 @@
 #include <vnet/dpo/dvr_dpo.h>
 #include <vnet/dpo/ip_null_dpo.h>
 #include <vnet/dpo/classify_dpo.h>
+#include <vnet/dpo/pw_cw.h>
 
 #include <vnet/adj/adj.h>
 #include <vnet/adj/adj_mcast.h>
@@ -1233,6 +1234,8 @@ fib_path_route_flags_to_cfg_flags (const fib_route_path_t *rpath)
 {
     fib_path_cfg_flags_t cfg_flags = FIB_PATH_CFG_FLAG_NONE;
 
+    if (rpath->frp_flags & FIB_ROUTE_PATH_POP_PW_CW)
+	cfg_flags |= FIB_PATH_CFG_FLAG_POP_PW_CW;
     if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_HOST)
 	cfg_flags |= FIB_PATH_CFG_FLAG_RESOLVE_HOST;
     if (rpath->frp_flags & FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED)
@@ -2381,6 +2384,16 @@ fib_path_stack_mpls_disp (fib_node_index_t path_index,
     case FIB_PATH_TYPE_DVR:
         break;
     }
+
+    if (path->fp_cfg_flags & FIB_PATH_CFG_FLAG_POP_PW_CW)
+    {
+        dpo_id_t tmp = DPO_INVALID;
+
+        dpo_copy(&tmp, dpo);
+
+        pw_cw_dpo_create(&tmp, dpo);
+        dpo_reset(&tmp);
+    }
 }
 
 void
diff --git a/src/vnet/fib/fib_path.h b/src/vnet/fib/fib_path.h
index 50aca9e1cf5..76f876d8f10 100644
--- a/src/vnet/fib/fib_path.h
+++ b/src/vnet/fib/fib_path.h
@@ -96,9 +96,13 @@ typedef enum fib_path_cfg_attribute_t_ {
      */
     FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC,
     /**
+     * The path pops a Psuedo Wire Control Word
+     */
+    FIB_PATH_CFG_ATTRIBUTE_POP_PW_CW,
+    /**
      * Marker. Add new types before this one, then update it.
      */
-    FIB_PATH_CFG_ATTRIBUTE_LAST = FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC,
+    FIB_PATH_CFG_ATTRIBUTE_LAST = FIB_PATH_CFG_ATTRIBUTE_POP_PW_CW,
 } __attribute__ ((packed)) fib_path_cfg_attribute_t;
 
 /**
@@ -119,6 +123,7 @@ typedef enum fib_path_cfg_attribute_t_ {
     [FIB_PATH_CFG_ATTRIBUTE_INTF_RX] = "interface-rx",	\
     [FIB_PATH_CFG_ATTRIBUTE_RPF_ID] = "rpf-id",         \
     [FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC] = "deag-src",     \
+    [FIB_PATH_CFG_ATTRIBUTE_POP_PW_CW] = "pop-pw-cw",     \
 }
 
 #define FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(_item) \
@@ -143,6 +148,7 @@ typedef enum fib_path_cfg_flags_t_ {
     FIB_PATH_CFG_FLAG_INTF_RX = (1 << FIB_PATH_CFG_ATTRIBUTE_INTF_RX),
     FIB_PATH_CFG_FLAG_RPF_ID = (1 << FIB_PATH_CFG_ATTRIBUTE_RPF_ID),
     FIB_PATH_CFG_FLAG_DEAG_SRC = (1 << FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC),
+    FIB_PATH_CFG_FLAG_POP_PW_CW = (1 << FIB_PATH_CFG_ATTRIBUTE_POP_PW_CW),
 } __attribute__ ((packed)) fib_path_cfg_flags_t;
 
 typedef enum fib_path_format_flags_t_
diff --git a/src/vnet/fib/fib_types.api b/src/vnet/fib/fib_types.api
index 9073192c3c4..4a5cea79064 100644
--- a/src/vnet/fib/fib_types.api
+++ b/src/vnet/fib/fib_types.api
@@ -44,9 +44,11 @@ enum fib_path_flags
 {
   FIB_API_PATH_FLAG_NONE = 0,
   /* the path must resolve via an attached route */
-  FIB_API_PATH_FLAG_RESOLVE_VIA_ATTACHED,
+  FIB_API_PATH_FLAG_RESOLVE_VIA_ATTACHED = 1,
   /* the path must resolve via a host route */
-  FIB_API_PATH_FLAG_RESOLVE_VIA_HOST,
+  FIB_API_PATH_FLAG_RESOLVE_VIA_HOST = 2,
+  /* pop a Pseudo Wire Control Word as well */
+  FIB_API_PATH_FLAG_POP_PW_CW = 4,
 };
 
 /* \brief A description of the 'next-hop' for a path
diff --git a/src/vnet/fib/fib_types.c b/src/vnet/fib/fib_types.c
index 4b1280f6fa8..386aece8753 100644
--- a/src/vnet/fib/fib_types.c
+++ b/src/vnet/fib/fib_types.c
@@ -537,6 +537,10 @@ unformat_fib_route_path (unformat_input_t * input, va_list * args)
         {
             rpath->frp_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED;
         }
+        else if (unformat (input, "pop-pw-cw"))
+        {
+            rpath->frp_flags |= FIB_ROUTE_PATH_POP_PW_CW;
+        }
         else if (unformat (input,
                            "ip4-lookup-in-table %d",
                            &rpath->frp_fib_index))
diff --git a/src/vnet/fib/fib_types.h b/src/vnet/fib/fib_types.h
index 77b133fa9db..980fe3d1d0a 100644
--- a/src/vnet/fib/fib_types.h
+++ b/src/vnet/fib/fib_types.h
@@ -383,6 +383,11 @@ typedef enum fib_route_path_flags_t_
     FIB_ROUTE_PATH_ICMP_UNREACH = (1 << 15),
     FIB_ROUTE_PATH_ICMP_PROHIBIT = (1 << 16),
     FIB_ROUTE_PATH_CLASSIFY = (1 << 17),
+
+    /**
+     * Pop a Psuedo Wire Control Word
+     */
+    FIB_ROUTE_PATH_POP_PW_CW = (1 << 18),
 } fib_route_path_flags_t;
 
 /**