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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: 2ccccf5fb4 ("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>
This commit is contained in:
Konstantin Khlebnikov 2017-08-15 16:37:04 +03:00 committed by David S. Miller
parent 898904226b
commit 325d5dc3f7
1 changed files with 4 additions and 1 deletions
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5
net/sched/sch_sfq.c
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@ -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);