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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-04 06:15:44 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-10-05 14:54:36 -0700 |
| commit | d6bf781712a1d25cc8987036b3a48535b331eb91 (patch) | |
| tree | cf83ab68ef2519576578d8336a43cc13cd375cde /net/ipv4/arp.c | |
| parent | 110b2499370c401cdcc7c63e481084467291d556 (diff) | |
| download | lwn-d6bf781712a1d25cc8987036b3a48535b331eb91.tar.gz lwn-d6bf781712a1d25cc8987036b3a48535b331eb91.zip | |
net neigh: RCU conversion of neigh hash table
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>
Diffstat (limited to 'net/ipv4/arp.c')
| -rw-r--r-- | net/ipv4/arp.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index d9031ad67826..f35309578170 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -127,7 +127,7 @@ EXPORT_SYMBOL(clip_tbl_hook); /* * Interface to generic neighbour cache. */ -static u32 arp_hash(const void *pkey, const struct net_device *dev); +static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 rnd); static int arp_constructor(struct neighbour *neigh); static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb); static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb); @@ -225,9 +225,11 @@ int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) } -static u32 arp_hash(const void *pkey, const struct net_device *dev) +static u32 arp_hash(const void *pkey, + const struct net_device *dev, + __u32 hash_rnd) { - return jhash_2words(*(u32 *)pkey, dev->ifindex, arp_tbl.hash_rnd); + return jhash_2words(*(u32 *)pkey, dev->ifindex, hash_rnd); } static int arp_constructor(struct neighbour *neigh) |