IPv6 Performance bugs

- inline the FIB lookup function; this requires access to the bihash, so for files that use more than one type this casues problems. those files that include ip6_fib.h unnecessarily have been updated
- better use of the feature arcs. ip6-lookup and interface-output are now sentinels (end-node-index in the cm speak) rather than enabled features.

Change-Id: I9d1375fee63f7dbb2d327da6124d8e60b63367ec
Signed-off-by: Neale Ranns <nranns@cisco.com>

6 files changed, 62 insertions, 70 deletions

diff --git a/src/vnet/dhcp/dhcp6_proxy_node.c b/src/vnet/dhcp/dhcp6_proxy_node.c
index de73154d..885313a5 100644
--- a/src/vnet/dhcp/dhcp6_proxy_node.c
+++ b/src/vnet/dhcp/dhcp6_proxy_node.c
@@ -19,9 +19,9 @@
 #include <vnet/pg/pg.h>
 #include <vnet/dhcp/dhcp_proxy.h>
 #include <vnet/dhcp/dhcp6_packet.h>
-#include <vnet/fib/ip6_fib.h>
 #include <vnet/mfib/mfib_table.h>
 #include <vnet/mfib/ip6_mfib.h>
+#include <vnet/fib/fib.h>
 
 static char * dhcpv6_proxy_error_strings[] = {
 #define dhcpv6_proxy_error(n,s) s,
@@ -966,7 +966,7 @@ static u8 *
 format_dhcp6_proxy_server (u8 * s, va_list * args)
 {
   dhcp_proxy_t * proxy = va_arg (*args, dhcp_proxy_t *);
-  ip6_fib_t *server_fib;
+  fib_table_t *server_fib;
   dhcp_server_t *server;
   ip6_mfib_t *rx_fib;
 
@@ -985,9 +985,10 @@ format_dhcp6_proxy_server (u8 * s, va_list * args)
 
   vec_foreach(server, proxy->dhcp_servers)
   {
-      server_fib = ip6_fib_get(server->server_fib_index);
+      server_fib = fib_table_get(server->server_fib_index,
+                                 FIB_PROTOCOL_IP6);
       s = format (s, "%u,%U  ",
-                  server_fib->table_id,
+                  server_fib->ft_table_id,
                   format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
   }
 
diff --git a/src/vnet/fib/fib.h b/src/vnet/fib/fib.h
index 7cf1d136..ec97c565 100644
--- a/src/vnet/fib/fib.h
+++ b/src/vnet/fib/fib.h
@@ -646,7 +646,5 @@
 
 #include <vnet/fib/fib_table.h>
 #include <vnet/fib/fib_entry.h>
-#include <vnet/fib/ip4_fib.h>
-#include <vnet/fib/ip6_fib.h>
 
 #endif
diff --git a/src/vnet/fib/ip6_fib.c b/src/vnet/fib/ip6_fib.c
index 4a24c212..527f9114 100644
--- a/src/vnet/fib/ip6_fib.c
+++ b/src/vnet/fib/ip6_fib.c
@@ -341,45 +341,6 @@ ip6_fib_table_entry_insert (u32 fib_index,
     compute_prefix_lengths_in_search_order (table);
 }
 
-u32 
-ip6_fib_table_fwding_lookup (ip6_main_t * im,
-                             u32 fib_index,
-                             const ip6_address_t * dst)
-{
-    const ip6_fib_table_instance_t *table;
-    int i, len;
-    int rv;
-    BVT(clib_bihash_kv) kv, value;
-    u64 fib;
-
-    table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
-    len = vec_len (table->prefix_lengths_in_search_order);
-
-    kv.key[0] = dst->as_u64[0];
-    kv.key[1] = dst->as_u64[1];
-    fib = ((u64)((fib_index))<<32);
-
-    for (i = 0; i < len; i++)
-    {
-	int dst_address_length = table->prefix_lengths_in_search_order[i];
-	ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
-      
-	ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
-	//As lengths are decreasing, masks are increasingly specific.
-	kv.key[0] &= mask->as_u64[0];
-	kv.key[1] &= mask->as_u64[1];
-	kv.key[2] = fib | dst_address_length;
-      
-	rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
-	if (rv == 0)
-	    return value.value;
-    }
-
-    /* default route is always present */
-    ASSERT(0);
-    return 0;
-}
-
 u32 ip6_fib_table_fwding_lookup_with_if_index (ip6_main_t * im,
 					       u32 sw_if_index,
 					       const ip6_address_t * dst)
diff --git a/src/vnet/fib/ip6_fib.h b/src/vnet/fib/ip6_fib.h
index 2bf8ef78..9789da4f 100644
--- a/src/vnet/fib/ip6_fib.h
+++ b/src/vnet/fib/ip6_fib.h
@@ -53,9 +53,6 @@ extern void ip6_fib_table_fwding_dpo_remove(u32 fib_index,
 u32 ip6_fib_table_fwding_lookup_with_if_index(ip6_main_t * im,
 					      u32 sw_if_index,
 					      const ip6_address_t * dst);
-u32 ip6_fib_table_fwding_lookup(ip6_main_t * im,
-				u32 fib_index,
-				const ip6_address_t * dst);
 
 /**
  * @brief Walk all entries in a FIB table
@@ -66,6 +63,45 @@ extern void ip6_fib_table_walk(u32 fib_index,
                                fib_table_walk_fn_t fn,
                                void *ctx);
 
+always_inline u32
+ip6_fib_table_fwding_lookup (ip6_main_t * im,
+                             u32 fib_index,
+                             const ip6_address_t * dst)
+{
+    const ip6_fib_table_instance_t *table;
+    int i, len;
+    int rv;
+    BVT(clib_bihash_kv) kv, value;
+    u64 fib;
+
+    table = &ip6_main.ip6_table[IP6_FIB_TABLE_FWDING];
+    len = vec_len (table->prefix_lengths_in_search_order);
+
+    kv.key[0] = dst->as_u64[0];
+    kv.key[1] = dst->as_u64[1];
+    fib = ((u64)((fib_index))<<32);
+
+    for (i = 0; i < len; i++)
+    {
+	int dst_address_length = table->prefix_lengths_in_search_order[i];
+	ip6_address_t * mask = &ip6_main.fib_masks[dst_address_length];
+
+	ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
+	//As lengths are decreasing, masks are increasingly specific.
+	kv.key[0] &= mask->as_u64[0];
+	kv.key[1] &= mask->as_u64[1];
+	kv.key[2] = fib | dst_address_length;
+
+	rv = BV(clib_bihash_search_inline_2)(&table->ip6_hash, &kv, &value);
+	if (rv == 0)
+	    return value.value;
+    }
+
+    /* default route is always present */
+    ASSERT(0);
+    return 0;
+}
+
 /**
  * @brief return the DPO that the LB stacks on.
  */
diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index 25714e48..28c84d1c 100644
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -444,12 +444,11 @@ ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
 	return;
     }
 
-  vnet_feature_enable_disable ("ip6-unicast", "ip6-lookup", sw_if_index,
-			       is_enable, 0, 0);
-
-  vnet_feature_enable_disable ("ip6-multicast", "ip6-mfib-forward-lookup",
-			       sw_if_index, is_enable, 0, 0);
+  vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index,
+			       !is_enable, 0, 0);
 
+  vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index,
+			       !is_enable, 0, 0);
 }
 
 /* get first interface address */
@@ -624,17 +623,17 @@ VNET_FEATURE_INIT (ip6_vxlan_bypass, static) =
   .runs_before = VNET_FEATURES ("ip6-lookup"),
 };
 
-VNET_FEATURE_INIT (ip6_lookup, static) =
+VNET_FEATURE_INIT (ip6_drop, static) =
 {
   .arc_name = "ip6-unicast",
-  .node_name = "ip6-lookup",
-  .runs_before = VNET_FEATURES ("ip6-drop"),
+  .node_name = "ip6-drop",
+  .runs_before = VNET_FEATURES ("ip6-lookup"),
 };
 
-VNET_FEATURE_INIT (ip6_drop, static) =
+VNET_FEATURE_INIT (ip6_lookup, static) =
 {
   .arc_name = "ip6-unicast",
-  .node_name = "ip6-drop",
+  .node_name = "ip6-lookup",
   .runs_before = 0,  /*last feature*/
 };
 
@@ -652,15 +651,15 @@ VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 };
 
-VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
+VNET_FEATURE_INIT (ip6_drop_mc, static) = {
   .arc_name = "ip6-multicast",
-  .node_name = "ip6-mfib-forward-lookup",
-  .runs_before = VNET_FEATURES ("ip6-drop"),
+  .node_name = "ip6-drop",
+  .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
 };
 
-VNET_FEATURE_INIT (ip6_drop_mc, static) = {
+VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
   .arc_name = "ip6-multicast",
-  .node_name = "ip6-drop",
+  .node_name = "ip6-mfib-forward-lookup",
   .runs_before = 0, /* last feature */
 };
 
@@ -699,9 +698,6 @@ ip6_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
   vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index,
 			       is_add, 0, 0);
 
-  vnet_feature_enable_disable ("ip6-output", "interface-output", sw_if_index,
-			       is_add, 0, 0);
-
   return /* no error */ 0;
 }
 
diff --git a/src/vnet/vxlan-gpe/vxlan_gpe.c b/src/vnet/vxlan-gpe/vxlan_gpe.c
index 2cba596f..1e674085 100644
--- a/src/vnet/vxlan-gpe/vxlan_gpe.c
+++ b/src/vnet/vxlan-gpe/vxlan_gpe.c
@@ -490,9 +490,9 @@ vxlan_gpe_add_del_tunnel_command_fn (vlib_main_t * vm,
     else if (unformat (line_input, "encap-vrf-id %d", &tmp))
       {
         if (ipv6_set)
-          encap_fib_index = ip6_fib_index_from_table_id (tmp);
+          encap_fib_index = fib_table_find (FIB_PROTOCOL_IP6, tmp);
         else
-          encap_fib_index =  ip4_fib_index_from_table_id (tmp);
+          encap_fib_index = fib_table_find (FIB_PROTOCOL_IP4, tmp);
 
         if (encap_fib_index == ~0)
           {
@@ -503,9 +503,9 @@ vxlan_gpe_add_del_tunnel_command_fn (vlib_main_t * vm,
     else if (unformat (line_input, "decap-vrf-id %d", &tmp))
       {
         if (ipv6_set)
-          decap_fib_index = ip6_fib_index_from_table_id (tmp);
+          decap_fib_index = fib_table_find (FIB_PROTOCOL_IP6, tmp);
         else
-          decap_fib_index = ip4_fib_index_from_table_id (tmp);
+          decap_fib_index = fib_table_find (FIB_PROTOCOL_IP4, tmp);
 
         if (decap_fib_index == ~0)
           {