[PATCH 4.4 049/114] sch_red: update backlog as well

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit d7f4f332f082c4d4ba53582f902ed6b44fd6f45e ]

Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Cc: Jamal Hadi Salim <j...@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/sched/sch_red.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 0505b8408c8b..4bf2b599ef98 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -97,6 +97,7 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 
        ret = qdisc_enqueue(skb, child);
        if (likely(ret == NET_XMIT_SUCCESS)) {
+               qdisc_qstats_backlog_inc(sch, skb);
                sch->q.qlen++;
        } else if (net_xmit_drop_count(ret)) {
                q->stats.pdrop++;
@@ -118,6 +119,7 @@ static struct sk_buff *red_dequeue(struct Qdisc *sch)
        skb = child->dequeue(child);
        if (skb) {
                qdisc_bstats_update(sch, skb);
+               qdisc_qstats_backlog_dec(sch, skb);
                sch->q.qlen--;
        } else {
                if (!red_is_idling(&q->vars))
@@ -143,6 +145,7 @@ static unsigned int red_drop(struct Qdisc *sch)
        if (child->ops->drop && (len = child->ops->drop(child)) > 0) {
                q->stats.other++;
                qdisc_qstats_drop(sch);
+               sch->qstats.backlog -= len;
                sch->q.qlen--;
                return len;
        }
@@ -158,6 +161,7 @@ static void red_reset(struct Qdisc *sch)
        struct red_sched_data *q = qdisc_priv(sch);
 
        qdisc_reset(q->qdisc);
+       sch->qstats.backlog = 0;
        sch->q.qlen = 0;
        red_restart(&q->vars);
 }
-- 
2.17.1