[Patch net] sch_drr: update backlog as well

[Cong Wang]

Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Cc: Jamal Hadi Salim <j...@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 net/sched/sch_drr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index a63e879..bf8af2c 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -375,6 +375,7 @@ static int drr_enqueue(struct sk_buff *skb, struct Qdisc 
*sch)
                cl->deficit = cl->quantum;
        }
 
+       qdisc_qstats_backlog_inc(sch, skb);
        sch->q.qlen++;
        return err;
 }
@@ -407,6 +408,7 @@ static struct sk_buff *drr_dequeue(struct Qdisc *sch)
 
                        bstats_update(&cl->bstats, skb);
                        qdisc_bstats_update(sch, skb);
+                       qdisc_qstats_backlog_dec(sch, skb);
                        sch->q.qlen--;
                        return skb;
                }
@@ -428,6 +430,7 @@ static unsigned int drr_drop(struct Qdisc *sch)
                if (cl->qdisc->ops->drop) {
                        len = cl->qdisc->ops->drop(cl->qdisc);
                        if (len > 0) {
+                               sch->qstats.backlog -= len;
                                sch->q.qlen--;
                                if (cl->qdisc->q.qlen == 0)
                                        list_del(&cl->alist);
@@ -463,6 +466,7 @@ static void drr_reset_qdisc(struct Qdisc *sch)
                        qdisc_reset(cl->qdisc);
                }
        }
+       sch->qstats.backlog = 0;
        sch->q.qlen = 0;
 }
 
-- 
2.1.0