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net_sched: use tcf_queue_work() in tcindex 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 18:24:39 -07:00 committed by David S. Miller
parent d4f84a41dc
commit 27ce4f05e2
1 changed files with 33 additions and 5 deletions
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38
net/sched/cls_tcindex.c
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@ -27,14 +27,20 @@
struct tcindex_filter_result {
struct tcf_exts exts;
struct tcf_result res;
struct rcu_head rcu;
union {
struct work_struct work;
struct rcu_head rcu;
};
};
struct tcindex_filter {
u16 key;
struct tcindex_filter_result result;
struct tcindex_filter __rcu *next;
struct rcu_head rcu;
union {
struct work_struct work;
struct rcu_head rcu;
};
};
@ -133,12 +139,34 @@ static int tcindex_init(struct tcf_proto *tp)
return 0;
}
static void tcindex_destroy_rexts_work(struct work_struct *work)
{
struct tcindex_filter_result *r;
r = container_of(work, struct tcindex_filter_result, work);
rtnl_lock();
tcf_exts_destroy(&r->exts);
rtnl_unlock();
}
static void tcindex_destroy_rexts(struct rcu_head *head)
{
struct tcindex_filter_result *r;
r = container_of(head, struct tcindex_filter_result, rcu);
tcf_exts_destroy(&r->exts);
INIT_WORK(&r->work, tcindex_destroy_rexts_work);
tcf_queue_work(&r->work);
}
static void tcindex_destroy_fexts_work(struct work_struct *work)
{
struct tcindex_filter *f = container_of(work, struct tcindex_filter,
work);
rtnl_lock();
tcf_exts_destroy(&f->result.exts);
kfree(f);
rtnl_unlock();
}
static void tcindex_destroy_fexts(struct rcu_head *head)
@ -146,8 +174,8 @@ static void tcindex_destroy_fexts(struct rcu_head *head)
struct tcindex_filter *f = container_of(head, struct tcindex_filter,
rcu);
tcf_exts_destroy(&f->result.exts);
kfree(f);
INIT_WORK(&f->work, tcindex_destroy_fexts_work);
tcf_queue_work(&f->work);
}
static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last)