[HICN-606] Added doxygen documentation

Signed-off-by: Alberto Compagno <acompagn+fdio@cisco.com>
Change-Id: If2bf7f4f310adf6adbbb9ea29eafcb2a0ee40d54

1 files changed, 53 insertions, 3 deletions

diff --git a/hicn-plugin/src/route.h b/hicn-plugin/src/route.h
index 4918f275b..a1ba86b3d 100644
--- a/hicn-plugin/src/route.h
+++ b/hicn-plugin/src/route.h
@@ -21,19 +21,54 @@
 #include "hicn.h"
 #include "faces/face.h"
 
+/**
+ * @file route.h
+ *
+ * hICN uses a specific vrf to install the routes for a prefix has been enabled to
+ * be hicn. It considers the vrf 0 (the default vrf) as the dominating vrf on
+ * which every route is stored. Enabling a prefix to be hICN will copy all the routes
+ * in the vrf 0 for the given prefi, in the vrf HICN. Every modification made on the
+ * vrf 0 on an hICN enabled prefix is reflected in the vrf hICN (through the use of
+ * the fib entry tracking functionality). Moreover, we use the lookup in the vrf hICN
+ * as a way for punting packet that must be processed as hICN. The implementation will
+ * install a special dpo as a single next hop for the vpp load balancer for each entry
+ * in the vrf hICN that we enabled. Such dpo will have two purposes: 1) to punt packets
+ * to the hICN forwarding pipeline, 2) to point to the righe strategy (the dpoi_index will
+ * be an index to the strategy context while the dpoi_type will be an index to the strategy vft).
+ *
+ * Additionally, hICN assign each interface to the vrf hICN; this is required for
+ * the interest lookup. Vpp performs a lookup in the vrf assigned to the interface,
+ * therefore if an interface is not assigned to the hICN vrf, the lookup will be done
+ * on the vrf 0 and the packet won't be processed through the hicn forwarding pipeline.
+ */
+
+/*
+ * Adding each interface to the vrf hICN has the side effect that to ping you need to
+ * specify the vrf hICN in the command.
+ */
+
 extern fib_source_t hicn_fib_src;
 
 extern dpo_type_t udp_encap_dpo_types[FIB_PROTOCOL_MAX];
 
-/*
- * Retrieve the hicn dpo corresponding to a hicn prefix
+/**
+ * @Brief Return the hicn_dpo corresponding to the prefix in teh vrf HICN
+ *
+ * @param prefix Prefix for which we want to retrieve the hICN dpo
+ * @param hicn_dpo return value with the hicn_dpo
+ * @param fib_index return value with the fib index corresponding to the prefix
  */
 int
 hicn_route_get_dpo (const fib_prefix_t * prefix,
 		    const dpo_id_t ** hicn_dpo, u32 * fib_index);
 
 
-/* Remove a next hop route for a name prefix */
+/**
+ * @Brief Set the strategy for a given prefix
+ *
+ * @param prefix Prefix for which we set the strategy
+ * @param stretegy_id Index of the strategy to set
+ */
 int
 hicn_route_set_strategy (fib_prefix_t * prefix, u32 strategy_id);
 
@@ -61,9 +96,24 @@ ip_nh_add_helper (fib_protocol_t fib_proto, const fib_prefix_t * pfx, ip46_addre
 int
 ip_nh_del_helper (fib_protocol_t fib_proto, const fib_prefix_t * rpfx, ip46_address_t * nh, u32 sw_if);
 
+/**
+ * @Brief Enable an hICN for an ip prefix
+ *
+ * @param prefix Prefix for which we enable hICN
+ * @return HICN_ERROR_NONE if hICN was enabled on the prefix
+ * HICN_ERROR_ROUTE_NO_LD if the first dpo for the fib entry corresponding to the prefix is not a load_balancer
+ * HICN_ERROR_ROUTE_DPO_NO_HICN if the loadbalancer in the vrf HICN already contains a dpo which is not an hICN one
+ * HICN_ERROR_ROUTE_MLT_LD if there are more than a dpo in the vpp loadbalancer
+ */
 int
 hicn_route_enable (fib_prefix_t *prefix);
 
+/**
+ * @Brief Disable an hICN for an ip prefix. If hICN wasn't enable on the prefix
+ * nothing happens and it returns HICN_ERROR_ROUTE_NOT_FOUND
+ *
+ * @param prefix Prefix for which we disable hICN
+ */
 int
 hicn_route_disable (fib_prefix_t *prefix);