[PATCH] net_sched/sfq: update hierarchical backlog when drop packet

[Konstantin Khlebnikov]

When sfq_enqueue() drops head packet or packet from another queue it
have to update backlog at upper qdiscs too.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
---
 net/sched/sch_sfq.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index f80ea2cc5f1f..82469ef9655e 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -437,6 +437,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct 
sk_buff **to_free)
                qdisc_drop(head, sch, to_free);
 
                slot_queue_add(slot, skb);
+               qdisc_tree_reduce_backlog(sch, 0, delta);
                return NET_XMIT_CN;
        }
 
@@ -468,8 +469,10 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct 
sk_buff **to_free)
        /* Return Congestion Notification only if we dropped a packet
         * from this flow.
         */
-       if (qlen != slot->qlen)
+       if (qlen != slot->qlen) {
+               qdisc_tree_reduce_backlog(sch, 0, dropped - qdisc_pkt_len(skb));
                return NET_XMIT_CN;
+       }
 
        /* As we dropped a packet, better let upper stack know this */
        qdisc_tree_reduce_backlog(sch, 1, dropped);