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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 /include/net/neighbour.h | |
| parent | 110b2499370c401cdcc7c63e481084467291d556 (diff) | |
| download | kernel-common-d6bf781712a1d25cc8987036b3a48535b331eb91.tar.gz kernel-common-d6bf781712a1d25cc8987036b3a48535b331eb91.tar.bz2 kernel-common-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 'include/net/neighbour.h')
| -rw-r--r-- | include/net/neighbour.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h index 7d08fd1062f0..37845dae6488 100644 --- a/include/net/neighbour.h +++ b/include/net/neighbour.h @@ -138,13 +138,22 @@ struct pneigh_entry { * neighbour table manipulation */ +struct neigh_hash_table { + struct neighbour **hash_buckets; + unsigned int hash_mask; + __u32 hash_rnd; + struct rcu_head rcu; +}; + struct neigh_table { struct neigh_table *next; int family; int entry_size; int key_len; - __u32 (*hash)(const void *pkey, const struct net_device *); + __u32 (*hash)(const void *pkey, + const struct net_device *dev, + __u32 hash_rnd); int (*constructor)(struct neighbour *); int (*pconstructor)(struct pneigh_entry *); void (*pdestructor)(struct pneigh_entry *); @@ -165,9 +174,7 @@ struct neigh_table { unsigned long last_rand; struct kmem_cache *kmem_cachep; struct neigh_statistics __percpu *stats; - struct neighbour **hash_buckets; - unsigned int hash_mask; - __u32 hash_rnd; + struct neigh_hash_table __rcu *nht; struct pneigh_entry **phash_buckets; }; @@ -237,6 +244,7 @@ extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_en struct neigh_seq_state { struct seq_net_private p; struct neigh_table *tbl; + struct neigh_hash_table *nht; void *(*neigh_sub_iter)(struct neigh_seq_state *state, struct neighbour *n, loff_t *pos); unsigned int bucket; |