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7e85dc8cb3
When blackhole is used on top of classful qdisc like hfsc it breaks qlen and backlog counters because packets are disappear without notice. In HFSC non-zero qlen while all classes are inactive triggers warning: WARNING: ... at net/sched/sch_hfsc.c:1393 hfsc_dequeue+0xba4/0xe90 [sch_hfsc] and schedules watchdog work endlessly. This patch return __NET_XMIT_BYPASS in addition to NET_XMIT_SUCCESS, this flag tells upper layer: this packet is gone and isn't queued. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
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* net/sched/sch_blackhole.c Black hole queue
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*
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* Note: Quantum tunneling is not supported.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <net/pkt_sched.h>
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static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free)
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{
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qdisc_drop(skb, sch, to_free);
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return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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}
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static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
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{
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return NULL;
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}
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static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
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.id = "blackhole",
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.priv_size = 0,
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.enqueue = blackhole_enqueue,
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.dequeue = blackhole_dequeue,
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.peek = blackhole_dequeue,
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.owner = THIS_MODULE,
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};
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static int __init blackhole_init(void)
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{
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return register_qdisc(&blackhole_qdisc_ops);
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}
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device_initcall(blackhole_init)
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