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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-28 12:46:53 +0900
committerYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-28 13:43:16 +0900
commitbe01d655d9b07c1350b19bf3d80eae0059254b4b (patch)
treef77499cd889646405d6293108a620d4ccf7a202b /net/core/neighbour.c
parent0a204500f913974b4ca9b6f509a43e1544239c6d (diff)
[NET] NEIGHBOUR: Extract hash/lookup functions for pneigh entries.
Extract hash function for pneigh entries from pneigh_lookup(), __pneigh_lookup() and pneigh_delete() as pneigh_hash(). Extract core of pneigh_lookup() and __pneigh_lookup() as __pneigh_lookup_1(). Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat (limited to 'net/core/neighbour.c')
-rw-r--r--net/core/neighbour.c61
1 files changed, 29 insertions, 32 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index d4fae81e5d0..75075c303c4 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -472,26 +472,40 @@ out_neigh_release:
}
EXPORT_SYMBOL(neigh_create);
-struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
- struct net *net, const void *pkey, struct net_device *dev)
+static u32 pneigh_hash(const void *pkey, int key_len)
{
- struct pneigh_entry *n;
- int key_len = tbl->key_len;
u32 hash_val = *(u32 *)(pkey + key_len - 4);
-
hash_val ^= (hash_val >> 16);
hash_val ^= hash_val >> 8;
hash_val ^= hash_val >> 4;
hash_val &= PNEIGH_HASHMASK;
+ return hash_val;
+}
- for (n = tbl->phash_buckets[hash_val]; n; n = n->next) {
+static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n,
+ struct net *net,
+ const void *pkey,
+ int key_len,
+ struct net_device *dev)
+{
+ while (n) {
if (!memcmp(n->key, pkey, key_len) &&
- (pneigh_net(n) == net) &&
+ net_eq(pneigh_net(n), net) &&
(n->dev == dev || !n->dev))
- break;
+ return n;
+ n = n->next;
}
+ return NULL;
+}
- return n;
+struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
+ struct net *net, const void *pkey, struct net_device *dev)
+{
+ int key_len = tbl->key_len;
+ u32 hash_val = pneigh_hash(pkey, key_len);
+
+ return __pneigh_lookup_1(tbl->phash_buckets[hash_val],
+ net, pkey, key_len, dev);
}
EXPORT_SYMBOL_GPL(__pneigh_lookup);
@@ -501,26 +515,14 @@ struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl,
{
struct pneigh_entry *n;
int key_len = tbl->key_len;
- u32 hash_val = *(u32 *)(pkey + key_len - 4);
-
- hash_val ^= (hash_val >> 16);
- hash_val ^= hash_val >> 8;
- hash_val ^= hash_val >> 4;
- hash_val &= PNEIGH_HASHMASK;
+ u32 hash_val = pneigh_hash(pkey, key_len);
read_lock_bh(&tbl->lock);
-
- for (n = tbl->phash_buckets[hash_val]; n; n = n->next) {
- if (!memcmp(n->key, pkey, key_len) &&
- net_eq(pneigh_net(n), net) &&
- (n->dev == dev || !n->dev)) {
- read_unlock_bh(&tbl->lock);
- goto out;
- }
- }
+ n = __pneigh_lookup_1(tbl->phash_buckets[hash_val],
+ net, pkey, key_len, dev);
read_unlock_bh(&tbl->lock);
- n = NULL;
- if (!creat)
+
+ if (n || !creat)
goto out;
ASSERT_RTNL();
@@ -561,12 +563,7 @@ int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey,
{
struct pneigh_entry *n, **np;
int key_len = tbl->key_len;
- u32 hash_val = *(u32 *)(pkey + key_len - 4);
-
- hash_val ^= (hash_val >> 16);
- hash_val ^= hash_val >> 8;
- hash_val ^= hash_val >> 4;
- hash_val &= PNEIGH_HASHMASK;
+ u32 hash_val = pneigh_hash(pkey, key_len);
write_lock_bh(&tbl->lock);
for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL;