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net_sched: only create filter chains for new filters/actions

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tcf_chain_get() always creates a new filter chain if not found
in existing ones. This is totally unnecessary when we get or
delete filters, new chain should be only created for new filters
(or new actions).

Fixes: 5bc1701881 ("net: sched: introduce multichain support for filters")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2017-05-23 09:42:37 -07:00 committed by David S. Miller
parent ee538dcea2
commit 367a8ce896
3 changed files with 12 additions and 6 deletions
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3
include/net/pkt_cls.h
View File

@ -18,7 +18,8 @@ int register_tcf_proto_ops(struct tcf_proto_ops *ops);
int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index);
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
bool create);
void tcf_chain_put(struct tcf_chain *chain);
int tcf_block_get(struct tcf_block **p_block,
struct tcf_proto __rcu **p_filter_chain);

2
net/sched/act_api.c
View File

@ -34,7 +34,7 @@ static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
if (!tp)
return -EINVAL;
a->goto_chain = tcf_chain_get(tp->chain->block, chain_index);
a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
if (!a->goto_chain)
return -ENOMEM;
return 0;

13
net/sched/cls_api.c
View File

@ -220,7 +220,8 @@ static void tcf_chain_destroy(struct tcf_chain *chain)
kfree(chain);
}
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index)
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
bool create)
{
struct tcf_chain *chain;
@ -230,7 +231,10 @@ struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index)
return chain;
}
}
return tcf_chain_create(block, chain_index);
if (create)
return tcf_chain_create(block, chain_index);
else
return NULL;
}
EXPORT_SYMBOL(tcf_chain_get);
@ -511,9 +515,10 @@ replay:
err = -EINVAL;
goto errout;
}
chain = tcf_chain_get(block, chain_index);
chain = tcf_chain_get(block, chain_index,
n->nlmsg_type == RTM_NEWTFILTER);
if (!chain) {
err = -ENOMEM;
err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL;
goto errout;
}