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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-06 17:49:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-10-06 18:01:33 -0700 |
| commit | 767e97e1e0db0d0f3152cd2f3bd3403596aedbad (patch) | |
| tree | cda6089e75f98fc3c9812993cf790fccac98b67a /include/net/neighbour.h | |
| parent | 546add79468183f266c75c632c96e4b0029e0d96 (diff) | |
| download | linux-767e97e1e0db0d0f3152cd2f3bd3403596aedbad.tar.gz linux-767e97e1e0db0d0f3152cd2f3bd3403596aedbad.tar.bz2 linux-767e97e1e0db0d0f3152cd2f3bd3403596aedbad.zip | |
neigh: RCU conversion of struct neighbour
This is the second step for neighbour RCU conversion.
(first was commit d6bf7817 : RCU conversion of neigh hash table)
neigh_lookup() becomes lockless, but still take a reference on found
neighbour. (no more read_lock()/read_unlock() on tbl->lock)
struct neighbour gets an additional rcu_head field and is freed after an
RCU grace period.
Future work would need to eventually not take a reference on neighbour
for temporary dst (DST_NOCACHE), but this would need dst->_neighbour to
use a noref bit like we did for skb->_dst.
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 | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h index 37845dae6488..a4538d553704 100644 --- a/include/net/neighbour.h +++ b/include/net/neighbour.h @@ -91,7 +91,7 @@ struct neigh_statistics { #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) struct neighbour { - struct neighbour *next; + struct neighbour __rcu *next; struct neigh_table *tbl; struct neigh_parms *parms; struct net_device *dev; @@ -111,6 +111,7 @@ struct neighbour { struct sk_buff_head arp_queue; struct timer_list timer; const struct neigh_ops *ops; + struct rcu_head rcu; u8 primary_key[0]; }; @@ -139,7 +140,7 @@ struct pneigh_entry { */ struct neigh_hash_table { - struct neighbour **hash_buckets; + struct neighbour __rcu **hash_buckets; unsigned int hash_mask; __u32 hash_rnd; struct rcu_head rcu; |