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authorWANG Cong <xiyou.wangcong@gmail.com>2017-08-24 16:51:29 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-25 17:19:10 -0700
commit143976ce992fcf3bfc0f4d15d5726bb492dcf262 (patch)
treea3f90e272ef152d3d262f1e56337d830315ba1b3 /net/sched/sch_dsmark.c
parentnet_sched: introduce tclass_del_notify() (diff)
downloadlinux-dev-143976ce992fcf3bfc0f4d15d5726bb492dcf262.tar.xz
linux-dev-143976ce992fcf3bfc0f4d15d5726bb492dcf262.zip
net_sched: remove tc class reference counting
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>
Diffstat (limited to 'net/sched/sch_dsmark.c')
-rw-r--r--net/sched/sch_dsmark.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 6d94fcc3592a..2836c80c7aa5 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -85,21 +85,21 @@ static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
return p->q;
}
-static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
+static unsigned long dsmark_find(struct Qdisc *sch, u32 classid)
{
- pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
- __func__, sch, qdisc_priv(sch), classid);
-
return TC_H_MIN(classid) + 1;
}
static unsigned long dsmark_bind_filter(struct Qdisc *sch,
unsigned long parent, u32 classid)
{
- return dsmark_get(sch, classid);
+ pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
+ __func__, sch, qdisc_priv(sch), classid);
+
+ return dsmark_find(sch, classid);
}
-static void dsmark_put(struct Qdisc *sch, unsigned long cl)
+static void dsmark_unbind_filter(struct Qdisc *sch, unsigned long cl)
{
}
@@ -469,14 +469,13 @@ nla_put_failure:
static const struct Qdisc_class_ops dsmark_class_ops = {
.graft = dsmark_graft,
.leaf = dsmark_leaf,
- .get = dsmark_get,
- .put = dsmark_put,
+ .find = dsmark_find,
.change = dsmark_change,
.delete = dsmark_delete,
.walk = dsmark_walk,
.tcf_block = dsmark_tcf_block,
.bind_tcf = dsmark_bind_filter,
- .unbind_tcf = dsmark_put,
+ .unbind_tcf = dsmark_unbind_filter,
.dump = dsmark_dump_class,
};