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net_sched: use tcf_queue_work() in matchall filter 

Defer the tcf_exts_destroy() in RCU callback to
tc filter workqueue and get RTNL lock.

Reported-by: Chris Mi <chrism@mellanox.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2017-10-26 18:24:35 -07:00 committed by David S. Miller
parent e071dff2a6
commit df2735ee8e
1 changed files with 16 additions and 3 deletions
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19
net/sched/cls_matchall.c
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@ -21,7 +21,10 @@ struct cls_mall_head {
struct tcf_result res;
u32 handle;
u32 flags;
struct rcu_head rcu;
union {
struct work_struct work;
struct rcu_head rcu;
};
};
static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
@ -41,13 +44,23 @@ static int mall_init(struct tcf_proto *tp)
return 0;
}
static void mall_destroy_work(struct work_struct *work)
{
struct cls_mall_head *head = container_of(work, struct cls_mall_head,
work);
rtnl_lock();
tcf_exts_destroy(&head->exts);
kfree(head);
rtnl_unlock();
}
static void mall_destroy_rcu(struct rcu_head *rcu)
{
struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
rcu);
tcf_exts_destroy(&head->exts);
kfree(head);
INIT_WORK(&head->work, mall_destroy_work);
tcf_queue_work(&head->work);
}
static int mall_replace_hw_filter(struct tcf_proto *tp,