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ipv4: Make neigh lookups directly in output packet path.

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Do not use the dst cached neigh, we'll be getting rid of that.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-07-02 02:02:15 -07:00
parent 11604721a3
commit a263b30936
5 changed files with 44 additions and 25 deletions
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include/net/arp.h
+19 -9
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@@ -15,24 +15,34 @@ static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd
return val * hash_rnd;
}
static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
{
struct neigh_hash_table *nht;
struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
struct neighbour *n;
u32 hash_val;
rcu_read_lock_bh();
nht = rcu_dereference_bh(arp_tbl.nht);
if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
key = 0;
hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
n != NULL;
n = rcu_dereference_bh(n->next)) {
if (n->dev == dev && *(u32 *)n->primary_key == key) {
if (!atomic_inc_not_zero(&n->refcnt))
n = NULL;
break;
}
if (n->dev == dev && *(u32 *)n->primary_key == key)
return n;
}
return NULL;
}
static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
{
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv4_neigh_lookup_noref(dev, key);
if (n && !atomic_inc_not_zero(&n->refcnt))
n = NULL;
rcu_read_unlock_bh();
return n;