Commit d4f84a41 authored by Cong Wang's avatar Cong Wang Committed by David S. Miller

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: default avatarChris 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: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c2f3f31d
...@@ -97,7 +97,10 @@ struct rsvp_filter { ...@@ -97,7 +97,10 @@ struct rsvp_filter {
u32 handle; u32 handle;
struct rsvp_session *sess; struct rsvp_session *sess;
union {
struct work_struct work;
struct rcu_head rcu; struct rcu_head rcu;
};
}; };
static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid) static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid)
...@@ -282,12 +285,22 @@ static int rsvp_init(struct tcf_proto *tp) ...@@ -282,12 +285,22 @@ static int rsvp_init(struct tcf_proto *tp)
return -ENOBUFS; return -ENOBUFS;
} }
static void rsvp_delete_filter_rcu(struct rcu_head *head) static void rsvp_delete_filter_work(struct work_struct *work)
{ {
struct rsvp_filter *f = container_of(head, struct rsvp_filter, rcu); struct rsvp_filter *f = container_of(work, struct rsvp_filter, work);
rtnl_lock();
tcf_exts_destroy(&f->exts); tcf_exts_destroy(&f->exts);
kfree(f); 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);
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) static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
......
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