net_sched/sfq: update hierarchical backlog when drop packet

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>

1 files changed, 4 insertions, 1 deletions

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 @@ congestion_drop:
                 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 @@ 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);