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net_sched: use tcf_queue_work() in flow 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>
hifive-unleashed-5.1
Cong Wang 2017-10-26 18:24:32 -07:00 committed by David S. Miller
parent b1b5b04fdb
commit 94cdb47566
1 changed files with 16 additions and 3 deletions
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19
net/sched/cls_flow.c
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@ -57,7 +57,10 @@ struct flow_filter {
u32 divisor;
u32 baseclass;
u32 hashrnd;
struct rcu_head rcu;
union {
struct work_struct work;
struct rcu_head rcu;
};
};
static inline u32 addr_fold(void *addr)
@ -369,14 +372,24 @@ static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
[TCA_FLOW_PERTURB] = { .type = NLA_U32 },
};
static void flow_destroy_filter(struct rcu_head *head)
static void flow_destroy_filter_work(struct work_struct *work)
{
struct flow_filter *f = container_of(head, struct flow_filter, rcu);
struct flow_filter *f = container_of(work, struct flow_filter, work);
rtnl_lock();
del_timer_sync(&f->perturb_timer);
tcf_exts_destroy(&f->exts);
tcf_em_tree_destroy(&f->ematches);
kfree(f);
rtnl_unlock();
}
static void flow_destroy_filter(struct rcu_head *head)
{
struct flow_filter *f = container_of(head, struct flow_filter, rcu);
INIT_WORK(&f->work, flow_destroy_filter_work);
tcf_queue_work(&f->work);
}
static int flow_change(struct net *net, struct sk_buff *in_skb,