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net_sched: remove tc class reference counting

Forráskód böngészése 
For TC classes, their ->get() and ->put() are always paired, and the
reference counting is completely useless, because:

1) For class modification and dumping paths, we already hold RTNL lock,
   so all of these ->get(),->change(),->put() are atomic.

2) For filter bindiing/unbinding, we use other reference counter than
   this one, and they should have RTNL lock too.

3) For ->qlen_notify(), it is special because it is called on ->enqueue()
   path, but we already hold qdisc tree lock there, and we hold this
   tree lock when graft or delete the class too, so it should not be gone
   or changed until we release the tree lock.

Therefore, this patch removes ->get() and ->put(), but:

1) Adds a new ->find() to find the pointer to a class by classid, no
   refcnt.

2) Move the original class destroy upon the last refcnt into ->delete(),
   right after releasing tree lock. This is fine because the class is
   already removed from hash when holding the lock.

For those who also use ->put() as ->unbind(), just rename them to reflect
this change.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong
2017-08-24 16:51:29 -07:00
committed by David S. Miller
szülő 14546ba1e5
commit 143976ce99
21 fájl változott, egészen pontosan 106 új sor hozzáadva és 262 régi sor törölve
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9
net/sched/sch_mqprio.c
Fájl megtekintése

@@ -277,7 +277,7 @@ static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
return dev_queue->qdisc_sleeping;
}
static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
{
struct net_device *dev = qdisc_dev(sch);
unsigned int ntx = TC_H_MIN(classid);
@@ -287,10 +287,6 @@ static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
return ntx;
}
static void mqprio_put(struct Qdisc *sch, unsigned long cl)
{
}
static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
@@ -403,8 +399,7 @@ static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
static const struct Qdisc_class_ops mqprio_class_ops = {
.graft = mqprio_graft,
.leaf = mqprio_leaf,
.get = mqprio_get,
.put = mqprio_put,
.find = mqprio_find,
.walk = mqprio_walk,
.dump = mqprio_dump_class,
.dump_stats = mqprio_dump_class_stats,