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net_sched: use tcf_queue_work() in rsvp 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 18:24:38 -07:00 committed by David S. Miller
parent c2f3f31d40
commit d4f84a41dc
1 changed files with 16 additions and 3 deletions
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19
net/sched/cls_rsvp.h
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@ -97,7 +97,10 @@ struct rsvp_filter {
u32 handle;
struct rsvp_session *sess;
struct rcu_head rcu;
union {
struct work_struct work;
struct rcu_head rcu;
};
};
static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid)
@ -282,12 +285,22 @@ static int rsvp_init(struct tcf_proto *tp)
return -ENOBUFS;
}
static void rsvp_delete_filter_work(struct work_struct *work)
{
struct rsvp_filter *f = container_of(work, struct rsvp_filter, work);
rtnl_lock();
tcf_exts_destroy(&f->exts);
kfree(f);
rtnl_unlock();
}
static void rsvp_delete_filter_rcu(struct rcu_head *head)
{
struct rsvp_filter *f = container_of(head, struct rsvp_filter, rcu);
tcf_exts_destroy(&f->exts);
kfree(f);
INIT_WORK(&f->work, rsvp_delete_filter_work);
tcf_queue_work(&f->work);
}
static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)