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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
Download Patch File Download Diff File Expand all files Collapse all files

13
net/decnet/dn_neigh.c
View File

@@ -48,7 +48,6 @@
#include <net/dn_neigh.h>
#include <net/dn_route.h>
static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev);
static int dn_neigh_construct(struct neighbour *);
static void dn_long_error_report(struct neighbour *, struct sk_buff *);
static void dn_short_error_report(struct neighbour *, struct sk_buff *);
@@ -93,6 +92,13 @@ static const struct neigh_ops dn_phase3_ops = {
.queue_xmit = dev_queue_xmit
};
static u32 dn_neigh_hash(const void *pkey,
const struct net_device *dev,
__u32 hash_rnd)
{
return jhash_2words(*(__u16 *)pkey, 0, hash_rnd);
}
struct neigh_table dn_neigh_table = {
.family = PF_DECnet,
.entry_size = sizeof(struct dn_neigh),
@@ -122,11 +128,6 @@ struct neigh_table dn_neigh_table = {
.gc_thresh3 = 1024,
};
static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev)
{
return jhash_2words(*(__u16 *)pkey, 0, dn_neigh_table.hash_rnd);
}
static int dn_neigh_construct(struct neighbour *neigh)
{
struct net_device *dev = neigh->dev;