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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2010-10-04 06:15:44 +00:00 • committed by David S. Miller
commit d6bf781712
6 changed files with 170 additions and 100 deletions
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10
net/ipv6/ndisc.c
View file

@ -91,7 +91,9 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
static u32 ndisc_hash(const void *pkey,
const struct net_device *dev,
__u32 rnd);
static int ndisc_constructor(struct neighbour *neigh);
static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
@ -350,7 +352,9 @@ int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int d
EXPORT_SYMBOL(ndisc_mc_map);
static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
static u32 ndisc_hash(const void *pkey,
const struct net_device *dev,
__u32 hash_rnd)
{
const u32 *p32 = pkey;
u32 addr_hash, i;
@ -359,7 +363,7 @@ static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
addr_hash ^= *p32++;
return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
return jhash_2words(addr_hash, dev->ifindex, hash_rnd);
}
static int ndisc_constructor(struct neighbour *neigh)