net/ip: Removing useless extra data capability in neighbors

This is not used by anyone, and is unlikely to be useful actually.
Helps to save 4 bytes for each instance of struct net_nbr also (removing
a 2 bytes attributes, which was anyway generating a 4bytes loss due to
structure misalignment).

Removing relevant useless functions related to it as well.

Signed-off-by: Tomasz Bursztyka <[email protected]>

Author: Tomasz Bursztyka

subsys/net/ip/ipv6_nbr.c

@@ -80,7 +80,7 @@ static void ipv6_nd_restart_reachable_timer(struct net_nbr *nbr, int64_t time);
 #define DELAY_FIRST_PROBE_TIME (5 * MSEC_PER_SEC)
 #define RETRANS_TIMER 1000 /* ms */
 
-extern void net_neighbor_data_remove(struct net_nbr *nbr);
+extern void net_neighbor_remove(struct net_nbr *nbr);
 extern void net_neighbor_table_clear(struct net_nbr_table *table);
 
 /** Neighbor Solicitation reply timer */
@@ -89,8 +89,7 @@ static struct k_work_delayable ipv6_ns_reply_timer;
 NET_NBR_POOL_INIT(net_neighbor_pool,
 		  CONFIG_NET_IPV6_MAX_NEIGHBORS,
 		  sizeof(struct net_ipv6_nbr_data),
-		  net_neighbor_data_remove,
-		  0);
+		  net_neighbor_remove);
 
 NET_NBR_TABLE_INIT(NET_NBR_GLOBAL,
 		   neighbor,
@@ -665,7 +664,7 @@ struct net_nbr *net_ipv6_nbr_add(struct net_if *iface,
 	return nbr;
 }
 
-void net_neighbor_data_remove(struct net_nbr *nbr)
+void net_neighbor_remove(struct net_nbr *nbr)
 {
 	NET_DBG("Neighbor %p removed", nbr);
 

subsys/net/ip/nbr.c

@@ -62,8 +62,7 @@ static inline struct net_nbr *get_nbr(struct net_nbr *start, int idx)
 	NET_ASSERT(idx < CONFIG_NET_IPV6_MAX_NEIGHBORS);
 
 	return (struct net_nbr *)((uint8_t *)start +
-			((sizeof(struct net_nbr) +
-			  start->size + start->extra_data_size) * idx));
+			((sizeof(struct net_nbr) + start->size) * idx));
 }
 
 struct net_nbr *net_nbr_get(struct net_nbr_table *table)

subsys/net/ip/nbr.h

@@ -56,9 +56,6 @@ struct net_nbr {
 	/** Amount of data that this neighbor buffer can store. */
 	const uint16_t size;
 
-	/** Extra data size associated with this neighbor */
-	const uint16_t extra_data_size;
-
 	/** Interface this neighbor is found */
 	struct net_if *iface;
 
@@ -75,17 +72,15 @@ struct net_nbr {
 };
 
 /* This is an array of struct net_nbr + some additional data */
-#define NET_NBR_POOL_INIT(_name, _count, _size, _remove, _extra_size)	\
+#define NET_NBR_POOL_INIT(_name, _count, _size, _remove)		\
 	struct {							\
 		struct net_nbr nbr;					\
 		uint8_t data[ROUND_UP(_size, 4)] __net_nbr_align;	\
-		uint8_t extra[ROUND_UP(_extra_size, 4)] __net_nbr_align;\
 	} _name[_count] = {						\
 		[0 ... (_count - 1)] = { .nbr = {			\
 			.idx = NET_NBR_LLADDR_UNKNOWN,			\
 			.remove = _remove,				\
-			.size = ROUND_UP(_size, 4),			\
-			.extra_data_size = ROUND_UP(_extra_size, 4) } },\
+			.size = ROUND_UP(_size, 4) } },			\
 	}
 
 struct net_nbr_table {
@@ -115,18 +110,6 @@ struct net_nbr_table {
 		}							\
 	}
 
-/**
- *  @brief Get a pointer to the extra data of a neighbor entry.
- *
- *  @param nbr A valid pointer to neighbor
- *
- *  @return Pointer to the extra data of the nbr.
- */
-static inline void *net_nbr_extra_data(struct net_nbr *nbr)
-{
-	return (void *)ROUND_UP((nbr->__nbr + nbr->size), sizeof(int));
-}
-
 /**
  * @brief Decrement the reference count. If count goes to 0, the neighbor
  * is released and returned to free list.

subsys/net/ip/route.c

@@ -29,10 +29,6 @@ LOG_MODULE_REGISTER(net_route, CONFIG_NET_ROUTE_LOG_LEVEL);
 #include "nbr.h"
 #include "route.h"
 
-#if !defined(NET_ROUTE_EXTRA_DATA_SIZE)
-#define NET_ROUTE_EXTRA_DATA_SIZE 0
-#endif
-
 /* We keep track of the routes in a separate list so that we can remove
  * the oldest routes (at tail) if needed.
  */
@@ -55,8 +51,7 @@ static void net_route_nexthop_remove(struct net_nbr *nbr)
 NET_NBR_POOL_INIT(net_route_nexthop_pool,
 		  CONFIG_NET_MAX_NEXTHOPS,
 		  sizeof(struct net_route_nexthop),
-		  net_route_nexthop_remove,
-		  0);
+		  net_route_nexthop_remove);
 
 static inline struct net_route_nexthop *net_nexthop_data(struct net_nbr *nbr)
 {
@@ -115,8 +110,7 @@ static void net_route_entries_table_clear(struct net_nbr_table *table)
 NET_NBR_POOL_INIT(net_route_entries_pool,
 		  CONFIG_NET_MAX_ROUTES,
 		  sizeof(struct net_route_entry),
-		  net_route_entry_remove,
-		  NET_ROUTE_EXTRA_DATA_SIZE);
+		  net_route_entry_remove);
 
 NET_NBR_TABLE_INIT(NET_NBR_LOCAL, nbr_routes, net_route_entries_pool,
 		   net_route_entries_table_clear);
@@ -665,70 +659,6 @@ int net_route_del_by_nexthop(struct net_if *iface, struct in6_addr *nexthop)
 	return 0;
 }
 
-int net_route_del_by_nexthop_data(struct net_if *iface,
-				  struct in6_addr *nexthop,
-				  void *data)
-{
-	int count = 0, status = 0;
-	struct net_nbr *nbr_nexthop;
-	struct net_route_nexthop *nexthop_route;
-	int i, ret;
-
-	NET_ASSERT(iface);
-	NET_ASSERT(nexthop);
-
-	net_ipv6_nbr_lock();
-
-	nbr_nexthop = net_ipv6_nbr_lookup(iface, nexthop);
-	if (!nbr_nexthop) {
-		net_ipv6_nbr_unlock();
-		return -EINVAL;
-	}
-
-	for (i = 0; i < CONFIG_NET_MAX_ROUTES; i++) {
-		struct net_nbr *nbr = get_nbr(i);
-		struct net_route_entry *route = net_route_data(nbr);
-
-		SYS_SLIST_FOR_EACH_CONTAINER(&route->nexthop, nexthop_route,
-					     node) {
-			void *extra_data;
-
-			if (nexthop_route->nbr != nbr_nexthop) {
-				continue;
-			}
-
-			if (nbr->extra_data_size == 0U) {
-				continue;
-			}
-
-			/* Routing engine specific extra data needs
-			 * to match too.
-			 */
-			extra_data = net_nbr_extra_data(nbr_nexthop);
-			if (extra_data != data) {
-				continue;
-			}
-
-			ret = net_route_del(route);
-			if (!ret) {
-				count++;
-			} else {
-				status = ret;
-			}
-
-			break;
-		}
-	}
-
-	net_ipv6_nbr_unlock();
-
-	if (count) {
-		return count;
-	}
-
-	return status;
-}
-
 struct in6_addr *net_route_get_nexthop(struct net_route_entry *route)
 {
 	struct net_route_nexthop *nexthop_route;

subsys/net/ip/route.h

@@ -138,22 +138,6 @@ int net_route_del(struct net_route_entry *entry);
 int net_route_del_by_nexthop(struct net_if *iface,
 			     struct in6_addr *nexthop);
 
-/**
- * @brief Delete a route from routing table by nexthop if the routing engine
- * specific data matches.
- *
- * @detail The routing engine specific data could be the RPL data.
- *
- * @param iface Network interface to use.
- * @param nexthop IPv6 address of the nexthop device.
- * @param data Routing engine specific data.
- *
- * @return number of routes deleted, <0 if error
- */
-int net_route_del_by_nexthop_data(struct net_if *iface,
-				  struct in6_addr *nexthop,
-				  void *data);
-
 /**
  * @brief Update the route lifetime.
  *

tests/net/neighbor/src/main.c

@@ -45,7 +45,7 @@ static void net_neighbor_table_clear(struct net_nbr_table *table)
 }
 
 NET_NBR_POOL_INIT(net_test_neighbor_pool, CONFIG_NET_IPV6_MAX_NEIGHBORS,
-		  0, net_neighbor_data_remove, 0);
+		  0, net_neighbor_data_remove);
 
 NET_NBR_TABLE_INIT(NET_NBR_LOCAL, test_neighbor, net_test_neighbor_pool,
 		   net_neighbor_table_clear);