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net_sched: update hierarchical backlog too

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When the bottom qdisc decides to, for example, drop some packet,
it calls qdisc_tree_decrease_qlen() to update the queue length
for all its ancestors, we need to update the backlog too to
keep the stats on root qdisc accurate.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong
2016-02-25 14:55:01 -08:00
committed by David S. Miller
parent 86a7996cc8
commit 2ccccf5fb4
21 changed files with 91 additions and 49 deletions
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3
net/sched/sch_red.c
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@@ -210,7 +210,8 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt)
q->flags = ctl->flags;
q->limit = ctl->limit;
if (child) {
qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
q->qdisc->qstats.backlog);
qdisc_destroy(q->qdisc);
q->qdisc = child;
}