netfilter: CLUSTERIP: RCU conversion

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- clusterip_lock becomes a spinlock
- lockless lookups
- kfree() deferred after RCU grace period
- rcu_barrier_bh() inserted in clusterip_tg_exit()

v2)
- As Patrick pointed out, we use atomic_inc_not_zero() in
clusterip_config_find_get().
- list_add_rcu() and list_del_rcu() variants are used.
- atomic_dec_and_lock() used in clusterip_config_entry_put()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

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Eric Dumazet 2010-06-15 13:08:51 +02:00 • committed by Patrick McHardy

parent 0b041f8d1e

commit d73f33b168

1 changed files with 29 additions and 19 deletions

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net/ipv4/netfilter/ipt_CLUSTERIP.c

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