xref: /openbmc/linux/net/sched/sch_blackhole.c (revision ac5c66f2)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net/sched/sch_blackhole.c	Black hole queue
4  *
5  * Authors:	Thomas Graf <tgraf@suug.ch>
6  *
7  * Note: Quantum tunneling is not supported.
8  */
9 
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <net/pkt_sched.h>
15 
blackhole_enqueue(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)16 static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch,
17 			     struct sk_buff **to_free)
18 {
19 	qdisc_drop(skb, sch, to_free);
20 	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
21 }
22 
blackhole_dequeue(struct Qdisc * sch)23 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
24 {
25 	return NULL;
26 }
27 
28 static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
29 	.id		= "blackhole",
30 	.priv_size	= 0,
31 	.enqueue	= blackhole_enqueue,
32 	.dequeue	= blackhole_dequeue,
33 	.peek		= blackhole_dequeue,
34 	.owner		= THIS_MODULE,
35 };
36 
blackhole_init(void)37 static int __init blackhole_init(void)
38 {
39 	return register_qdisc(&blackhole_qdisc_ops);
40 }
41 device_initcall(blackhole_init)
42