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Message-Id: <20171027012443.3306-12-xiyou.wangcong@gmail.com>
Date: Thu, 26 Oct 2017 18:24:38 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: Chris Mi <chrism@...lanox.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Daniel Borkmann <daniel@...earbox.net>,
Jiri Pirko <jiri@...nulli.us>,
John Fastabend <john.fastabend@...il.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [Patch net 11/16] 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@...lanox.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jiri Pirko <jiri@...nulli.us>
Cc: John Fastabend <john.fastabend@...il.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
net/sched/cls_rsvp.h | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index b1f6ed48bc72..bdbc541787f8 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_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);
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)
--
2.13.0
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