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
/*
|
|
* net/sched/sch_blackhole.c Black hole queue
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Thomas Graf <tgraf@suug.ch>
|
|
*
|
|
* Note: Quantum tunneling is not supported.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
qdisc_drop(skb, sch, to_free);
|
|
return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
|
|
}
|
|
|
|
static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
|
|
.id = "blackhole",
|
|
.priv_size = 0,
|
|
.enqueue = blackhole_enqueue,
|
|
.dequeue = blackhole_dequeue,
|
|
.peek = blackhole_dequeue,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init blackhole_init(void)
|
|
{
|
|
return register_qdisc(&blackhole_qdisc_ops);
|
|
}
|
|
device_initcall(blackhole_init)
|