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net neigh: RCU conversion of neigh hash table

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David

This is the first step for RCU conversion of neigh code.

Next patches will convert hash_buckets[] and "struct neighbour" to RCU
protected objects.

Thanks

[PATCH net-next] net neigh: RCU conversion of neigh hash table

Instead of storing hash_buckets, hash_mask and hash_rnd in "struct
neigh_table", a new structure is defined :

struct neigh_hash_table {
       struct neighbour        **hash_buckets;
       unsigned int            hash_mask;
       __u32                   hash_rnd;
       struct rcu_head         rcu;
};

And "struct neigh_table" has an RCU protected pointer to such a
neigh_hash_table.

This means the signature of (*hash)() function changed: We need to add a
third parameter with the actual hash_rnd value, since this is not
anymore a neigh_table field.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-10-04 06:15:44 +00:00
committed by David S. Miller
parent 110b249937
commit d6bf781712
6 changed files with 170 additions and 100 deletions
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4
net/atm/clip.c
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@@ -310,9 +310,9 @@ static int clip_constructor(struct neighbour *neigh)
return 0;
}
static u32 clip_hash(const void *pkey, const struct net_device *dev)
static u32 clip_hash(const void *pkey, const struct net_device *dev, __u32 rnd)
{
return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
return jhash_2words(*(u32 *) pkey, dev->ifindex, rnd);
}
static struct neigh_table clip_tbl = {