Load Balancer: Use FIB 2.0

This patch fixes load balancer, which was not working
since FIB 2.0.

Two FIB DPO types are defined:
- One for IPv4 GRE
- One for IPv6 GRE

When an AS is created, the plugin automatically uses
the result from the FIB in order to transmit the packet.
Therefore, the packet does not need to visit ip-lookup twice.

The 'bypass' command was removed, as it is now done
automatically using this process.

Change-Id: Ib505ba31bfc67897eaff752821087821c360360a
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

1 files changed, 40 insertions, 26 deletions

diff --git a/plugins/lb-plugin/lb/lb.h b/plugins/lb-plugin/lb/lb.h
index 14a4d8a39e7..09cfde3e378 100644
--- a/plugins/lb-plugin/lb/lb.h
+++ b/plugins/lb-plugin/lb/lb.h
@@ -35,18 +35,30 @@
 
 #include <vnet/vnet.h>
 #include <vnet/ip/ip.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/fib/fib_table.h>
 
 #include <lb/lbhash.h>
 
 #define LB_DEFAULT_PER_CPU_STICKY_BUCKETS 1 << 10
 #define LB_DEFAULT_FLOW_TIMEOUT 40
 
+typedef enum {
+  LB_NEXT_DROP,
+  LB_N_NEXT,
+} lb_next_t;
+
 /**
  * Each VIP is configured with a set of
  * application server.
  */
 typedef struct {
   /**
+   * Registration to FIB event.
+   */
+  fib_node_t fib_node;
+
+  /**
    * Destination address used to tunnel traffic towards
    * that application server.
    * The address is also used as ID and pseudo-random
@@ -55,13 +67,6 @@ typedef struct {
   ip46_address_t address;
 
   /**
-   * Second ip lookup can be avoided by sending directly the packet
-   * to ip-rewrite with a configured adjacency.
-   * When set to ~0, the packets are sent to ip6-lookup.
-   */
-  u32 adj_index;
-
-  /**
    * ASs are indexed by address and VIP Index.
    * Which means there will be duplicated if the same server
    * address is used for multiple VIPs.
@@ -86,6 +91,22 @@ typedef struct {
    * may happen.
    */
   u32 last_used;
+
+  /**
+   * The FIB entry index for the next-hop
+   */
+  fib_node_index_t next_hop_fib_entry_index;
+
+  /**
+   * The child index on the FIB entry
+   */
+  u32 next_hop_child_index;
+
+  /**
+   * The next DPO in the graph to follow.
+   */
+  dpo_id_t dpo;
+
 } lb_as_t;
 
 format_function_t format_lb_as;
@@ -180,15 +201,13 @@ typedef struct {
    * in the adjacency index.
    */
   u8 flags;
+#define LB_VIP_FLAGS_USED 0x1
 
   /**
    * Pool of AS indexes used for this VIP.
    * This also includes ASs that have been removed (but are still referenced).
    */
   u32 *as_indexes;
-
-#define LB_VIP_FLAGS_USED 0x1
-
 } lb_vip_t;
 
 #define lb_vip_is_ip4(vip) ((vip)->type == LB_VIP_TYPE_IP4_GRE6 || (vip)->type == LB_VIP_TYPE_IP4_GRE4)
@@ -261,6 +280,17 @@ typedef struct {
   vlib_simple_counter_main_t vip_counters[LB_N_VIP_COUNTERS];
 
   /**
+   * DPO used to send packet from IP4/6 lookup to LB node.
+   */
+  dpo_type_t dpo_gre4_type;
+  dpo_type_t dpo_gre6_type;
+
+  /**
+   * Node type for registering to fib changes.
+   */
+  fib_node_type_t fib_node_type;
+
+  /**
    * API dynamically registered base ID.
    */
   u16 msg_id_base;
@@ -268,16 +298,6 @@ typedef struct {
   volatile u32 *writer_lock;
 } lb_main_t;
 
-/**
- * struct stored in adj->opaque data.
- */
-typedef struct {
-  /**
-   * Index of the VIP associated with that IP adjacency.
-   */
-  u32 vip_index;
-} lb_adj_data_t;
-
 extern lb_main_t lb_main;
 extern vlib_node_registration_t lb6_node;
 extern vlib_node_registration_t lb4_node;
@@ -302,12 +322,6 @@ int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u32 *vip_index);
 int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n);
 int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n);
 
-/**
- * Updates the adjacency index stored in the AS such that the second
- * IP lookup (after encap) can be bypassed.
- */
-int lb_as_lookup_bypass(u32 vip_index, ip46_address_t *address, u8 is_disable);
-
 u32 lb_hash_time_now(vlib_main_t * vm);
 
 void lb_garbage_collection();