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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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8
net/sched/sch_api.c
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@ -744,14 +744,15 @@ static u32 qdisc_alloc_handle(struct net_device *dev)
return 0;
}
void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n,
unsigned int len)
{
const struct Qdisc_class_ops *cops;
unsigned long cl;
u32 parentid;
int drops;
if (n == 0)
if (n == 0 && len == 0)
return;
drops = max_t(int, n, 0);
rcu_read_lock();
@ -774,11 +775,12 @@ void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
cops->put(sch, cl);
}
sch->q.qlen -= n;
sch->qstats.backlog -= len;
__qdisc_qstats_drop(sch, drops);
}
rcu_read_unlock();
}
EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
static void notify_and_destroy(struct net *net, struct sk_buff *skb,
struct nlmsghdr *n, u32 clid,