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authorDavid S. Miller <davem@davemloft.net>2011-12-29 00:41:23 +0400
committerDavid S. Miller <davem@davemloft.net>2011-12-29 00:41:23 +0400
commitf83c7790dc0025fffbd8684f3803a7571f624baa (patch)
tree9e745f6b44b1947033a143423560af6a3157fce7 /include/net/ndisc.h
parent2c2aba6c561ac425602f4a0be61422224cb87151 (diff)
downloadlinux-f83c7790dc0025fffbd8684f3803a7571f624baa.tar.xz
ipv6: Create fast inline ipv6 neigh lookup just like ipv4.
Also, create and use an rt6_bind_neighbour() in net/ipv6/route.c to consolidate some common logic. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ndisc.h')
-rw-r--r--include/net/ndisc.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index e9c30023b784..e3133c23980e 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -89,6 +89,33 @@ static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, _
(p32[3] * hash_rnd[3]));
}
+static inline struct neighbour *__ipv6_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
+{
+ struct neigh_hash_table *nht;
+ const u32 *p32 = pkey;
+ struct neighbour *n;
+ u32 hash_val;
+
+ rcu_read_lock_bh();
+ nht = rcu_dereference_bh(tbl->nht);
+ hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
+ for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
+ n != NULL;
+ n = rcu_dereference_bh(n->next)) {
+ u32 *n32 = (u32 *) n->primary_key;
+ if (n->dev == dev &&
+ ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
+ (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
+ if (!atomic_inc_not_zero(&n->refcnt))
+ n = NULL;
+ break;
+ }
+ }
+ rcu_read_unlock_bh();
+
+ return n;
+}
+
extern int ndisc_init(void);
extern void ndisc_cleanup(void);