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>
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index b1f6ed4..bdbc541 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -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)