net_sched/sfq: update hierarchical backlog when drop packet

[ Upstream commit 325d5dc3f7e7c2840b65e4a2988c082c2c0025c5 ]

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

Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index bc5e99584e41ab1cdc31655bce56e42a2c83af19..ea8a56f76b32db0c10a37063f1e5ef2df0684cc0 100644 (file)
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -434,6 +434,7 @@ congestion_drop:
                qdisc_drop(head, sch, to_free);
 
                slot_queue_add(slot, skb);
+               qdisc_tree_reduce_backlog(sch, 0, delta);
                return NET_XMIT_CN;
        }
 
@@ -465,8 +466,10 @@ enqueue:
        /* 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);