[deliverable/linux.git] / net / sched / sch_multiq.c

/*
 * Copyright (c) 2008, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>


struct multiq_sched_data {
	u16 bands;
	u16 max_bands;
	u16 curband;
	struct tcf_proto __rcu *filter_list;
	struct Qdisc **queues;
};


static struct Qdisc *
multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	u32 band;
	struct tcf_result res;
	struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
	int err;

	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
	err = tc_classify(skb, fl, &res, false);
#ifdef CONFIG_NET_CLS_ACT
	switch (err) {
	case TC_ACT_STOLEN:
	case TC_ACT_QUEUED:
		*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
	case TC_ACT_SHOT:
		return NULL;
	}
#endif
	band = skb_get_queue_mapping(skb);

	if (band >= q->bands)
		return q->queues[0];

	return q->queues[band];
}

static int
multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch,
	       struct sk_buff **to_free)
{
	struct Qdisc *qdisc;
	int ret;

	qdisc = multiq_classify(skb, sch, &ret);
#ifdef CONFIG_NET_CLS_ACT
	if (qdisc == NULL) {

		if (ret & __NET_XMIT_BYPASS)
			qdisc_qstats_drop(sch);
		__qdisc_drop(skb, to_free);
		return ret;
	}
#endif

	ret = qdisc_enqueue(skb, qdisc, to_free);
	if (ret == NET_XMIT_SUCCESS) {
		sch->q.qlen++;
		return NET_XMIT_SUCCESS;
	}
	if (net_xmit_drop_count(ret))
		qdisc_qstats_drop(sch);
	return ret;
}

static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	struct Qdisc *qdisc;
	struct sk_buff *skb;
	int band;

	for (band = 0; band < q->bands; band++) {
		/* cycle through bands to ensure fairness */
		q->curband++;
		if (q->curband >= q->bands)
			q->curband = 0;

		/* Check that target subqueue is available before
		 * pulling an skb to avoid head-of-line blocking.
		 */
		if (!netif_xmit_stopped(
		    netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
			qdisc = q->queues[q->curband];
			skb = qdisc->dequeue(qdisc);
			if (skb) {
				qdisc_bstats_update(sch, skb);
				sch->q.qlen--;
				return skb;
			}
		}
	}
	return NULL;

}

static struct sk_buff *multiq_peek(struct Qdisc *sch)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	unsigned int curband = q->curband;
	struct Qdisc *qdisc;
	struct sk_buff *skb;
	int band;

	for (band = 0; band < q->bands; band++) {
		/* cycle through bands to ensure fairness */
		curband++;
		if (curband >= q->bands)
			curband = 0;

		/* Check that target subqueue is available before
		 * pulling an skb to avoid head-of-line blocking.
		 */
		if (!netif_xmit_stopped(
		    netdev_get_tx_queue(qdisc_dev(sch), curband))) {
			qdisc = q->queues[curband];
			skb = qdisc->ops->peek(qdisc);
			if (skb)
				return skb;
		}
	}
	return NULL;

}

static void
multiq_reset(struct Qdisc *sch)
{
	u16 band;
	struct multiq_sched_data *q = qdisc_priv(sch);

	for (band = 0; band < q->bands; band++)
		qdisc_reset(q->queues[band]);
	sch->q.qlen = 0;
	q->curband = 0;
}

static void
multiq_destroy(struct Qdisc *sch)
{
	int band;
	struct multiq_sched_data *q = qdisc_priv(sch);

	tcf_destroy_chain(&q->filter_list);
	for (band = 0; band < q->bands; band++)
		qdisc_destroy(q->queues[band]);

	kfree(q->queues);
}

static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	struct tc_multiq_qopt *qopt;
	int i;

	if (!netif_is_multiqueue(qdisc_dev(sch)))
		return -EOPNOTSUPP;
	if (nla_len(opt) < sizeof(*qopt))
		return -EINVAL;

	qopt = nla_data(opt);

	qopt->bands = qdisc_dev(sch)->real_num_tx_queues;

	sch_tree_lock(sch);
	q->bands = qopt->bands;
	for (i = q->bands; i < q->max_bands; i++) {
		if (q->queues[i] != &noop_qdisc) {
			struct Qdisc *child = q->queues[i];
			q->queues[i] = &noop_qdisc;
			qdisc_tree_reduce_backlog(child, child->q.qlen,
						  child->qstats.backlog);
			qdisc_destroy(child);
		}
	}

	sch_tree_unlock(sch);

	for (i = 0; i < q->bands; i++) {
		if (q->queues[i] == &noop_qdisc) {
			struct Qdisc *child, *old;
			child = qdisc_create_dflt(sch->dev_queue,
						  &pfifo_qdisc_ops,
						  TC_H_MAKE(sch->handle,
							    i + 1));
			if (child) {
				sch_tree_lock(sch);
				old = q->queues[i];
				q->queues[i] = child;

				if (old != &noop_qdisc) {
					qdisc_tree_reduce_backlog(old,
								  old->q.qlen,
								  old->qstats.backlog);
					qdisc_destroy(old);
				}
				sch_tree_unlock(sch);
			}
		}
	}
	return 0;
}

static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	int i, err;

	q->queues = NULL;

	if (opt == NULL)
		return -EINVAL;

	q->max_bands = qdisc_dev(sch)->num_tx_queues;

	q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
	if (!q->queues)
		return -ENOBUFS;
	for (i = 0; i < q->max_bands; i++)
		q->queues[i] = &noop_qdisc;

	err = multiq_tune(sch, opt);

	if (err)
		kfree(q->queues);

	return err;
}

static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	unsigned char *b = skb_tail_pointer(skb);
	struct tc_multiq_qopt opt;

	opt.bands = q->bands;
	opt.max_bands = q->max_bands;

	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
		      struct Qdisc **old)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	unsigned long band = arg - 1;

	if (new == NULL)
		new = &noop_qdisc;

	*old = qdisc_replace(sch, new, &q->queues[band]);
	return 0;
}

static struct Qdisc *
multiq_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	unsigned long band = arg - 1;

	return q->queues[band];
}

static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	unsigned long band = TC_H_MIN(classid);

	if (band - 1 >= q->bands)
		return 0;
	return band;
}

static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
				 u32 classid)
{
	return multiq_get(sch, classid);
}


static void multiq_put(struct Qdisc *q, unsigned long cl)
{
}

static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
			     struct sk_buff *skb, struct tcmsg *tcm)
{
	struct multiq_sched_data *q = qdisc_priv(sch);

	tcm->tcm_handle |= TC_H_MIN(cl);
	tcm->tcm_info = q->queues[cl - 1]->handle;
	return 0;
}

static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
				 struct gnet_dump *d)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	struct Qdisc *cl_q;

	cl_q = q->queues[cl - 1];
	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
				  d, NULL, &cl_q->bstats) < 0 ||
	    gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
		return -1;

	return 0;
}

static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	int band;

	if (arg->stop)
		return;

	for (band = 0; band < q->bands; band++) {
		if (arg->count < arg->skip) {
			arg->count++;
			continue;
		}
		if (arg->fn(sch, band + 1, arg) < 0) {
			arg->stop = 1;
			break;
		}
		arg->count++;
	}
}

static struct tcf_proto __rcu **multiq_find_tcf(struct Qdisc *sch,
						unsigned long cl)
{
	struct multiq_sched_data *q = qdisc_priv(sch);

	if (cl)
		return NULL;
	return &q->filter_list;
}

static const struct Qdisc_class_ops multiq_class_ops = {
	.graft		=	multiq_graft,
	.leaf		=	multiq_leaf,
	.get		=	multiq_get,
	.put		=	multiq_put,
	.walk		=	multiq_walk,
	.tcf_chain	=	multiq_find_tcf,
	.bind_tcf	=	multiq_bind,
	.unbind_tcf	=	multiq_put,
	.dump		=	multiq_dump_class,
	.dump_stats	=	multiq_dump_class_stats,
};

static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
	.next		=	NULL,
	.cl_ops		=	&multiq_class_ops,
	.id		=	"multiq",
	.priv_size	=	sizeof(struct multiq_sched_data),
	.enqueue	=	multiq_enqueue,
	.dequeue	=	multiq_dequeue,
	.peek		=	multiq_peek,
	.init		=	multiq_init,
	.reset		=	multiq_reset,
	.destroy	=	multiq_destroy,
	.change		=	multiq_tune,
	.dump		=	multiq_dump,
	.owner		=	THIS_MODULE,
};

static int __init multiq_module_init(void)
{
	return register_qdisc(&multiq_qdisc_ops);
}

static void __exit multiq_module_exit(void)
{
	unregister_qdisc(&multiq_qdisc_ops);
}

module_init(multiq_module_init)
module_exit(multiq_module_exit)

MODULE_LICENSE("GPL");
Commit	Line	Data
92651940 AD	1	/*
	2	* Copyright (c) 2008, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
c057b190	14	* this program; if not, see <http://www.gnu.org/licenses/>.
92651940 AD	15	*
	16	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	17	*/
	18
	19	#include <linux/module.h>
5a0e3ad6	20	#include <linux/slab.h>
92651940 AD	21	#include <linux/types.h>
	22	#include <linux/kernel.h>
	23	#include <linux/string.h>
	24	#include <linux/errno.h>
	25	#include <linux/skbuff.h>
	26	#include <net/netlink.h>
	27	#include <net/pkt_sched.h>
	28
	29
	30	struct multiq_sched_data {
	31	u16 bands;
	32	u16 max_bands;
	33	u16 curband;
25d8c0d5	34	struct tcf_proto __rcu *filter_list;
92651940 AD	35	struct Qdisc **queues;
	36	};
	37
	38
	39	static struct Qdisc *
	40	multiq_classify(struct sk_buff skb, struct Qdisc sch, int *qerr)
	41	{
	42	struct multiq_sched_data *q = qdisc_priv(sch);
	43	u32 band;
	44	struct tcf_result res;
25d8c0d5	45	struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
92651940 AD	46	int err;
	47
	48	*qerr = NET_XMIT_SUCCESS \| __NET_XMIT_BYPASS;
3b3ae880	49	err = tc_classify(skb, fl, &res, false);
92651940 AD	50	#ifdef CONFIG_NET_CLS_ACT
	51	switch (err) {
	52	case TC_ACT_STOLEN:
	53	case TC_ACT_QUEUED:
	54	*qerr = NET_XMIT_SUCCESS \| __NET_XMIT_STOLEN;
	55	case TC_ACT_SHOT:
	56	return NULL;
	57	}
	58	#endif
	59	band = skb_get_queue_mapping(skb);
	60
	61	if (band >= q->bands)
	62	return q->queues[0];
	63
	64	return q->queues[band];
	65	}
	66
	67	static int
520ac30f ED	68	multiq_enqueue(struct sk_buff skb, struct Qdisc sch,
520ac30f ED	69	struct sk_buff **to_free)
92651940 AD	70	{
	71	struct Qdisc *qdisc;
	72	int ret;
	73
	74	qdisc = multiq_classify(skb, sch, &ret);
	75	#ifdef CONFIG_NET_CLS_ACT
	76	if (qdisc == NULL) {
	77
	78	if (ret & __NET_XMIT_BYPASS)
25331d6c	79	qdisc_qstats_drop(sch);
520ac30f	80	__qdisc_drop(skb, to_free);
92651940 AD	81	return ret;
	82	}
	83	#endif
	84
520ac30f	85	ret = qdisc_enqueue(skb, qdisc, to_free);
92651940	86	if (ret == NET_XMIT_SUCCESS) {
92651940 AD	87	sch->q.qlen++;
	88	return NET_XMIT_SUCCESS;
	89	}
	90	if (net_xmit_drop_count(ret))
25331d6c	91	qdisc_qstats_drop(sch);
92651940 AD	92	return ret;
	93	}
	94
92651940 AD	95	static struct sk_buff multiq_dequeue(struct Qdisc sch)
	96	{
	97	struct multiq_sched_data *q = qdisc_priv(sch);
	98	struct Qdisc *qdisc;
	99	struct sk_buff *skb;
	100	int band;
	101
	102	for (band = 0; band < q->bands; band++) {
	103	/* cycle through bands to ensure fairness */
	104	q->curband++;
	105	if (q->curband >= q->bands)
	106	q->curband = 0;
	107
	108	/* Check that target subqueue is available before
f30ab418	109	* pulling an skb to avoid head-of-line blocking.
92651940	110	*/
73466498 TH	111	if (!netif_xmit_stopped(
73466498 TH	112	netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
92651940 AD	113	qdisc = q->queues[q->curband];
	114	skb = qdisc->dequeue(qdisc);
	115	if (skb) {
9190b3b3	116	qdisc_bstats_update(sch, skb);
92651940 AD	117	sch->q.qlen--;
	118	return skb;
	119	}
	120	}
	121	}
	122	return NULL;
	123
	124	}
	125
8e3af978 JP	126	static struct sk_buff multiq_peek(struct Qdisc sch)
	127	{
	128	struct multiq_sched_data *q = qdisc_priv(sch);
	129	unsigned int curband = q->curband;
	130	struct Qdisc *qdisc;
	131	struct sk_buff *skb;
	132	int band;
	133
	134	for (band = 0; band < q->bands; band++) {
	135	/* cycle through bands to ensure fairness */
	136	curband++;
	137	if (curband >= q->bands)
	138	curband = 0;
	139
	140	/* Check that target subqueue is available before
f30ab418	141	* pulling an skb to avoid head-of-line blocking.
8e3af978	142	*/
73466498 TH	143	if (!netif_xmit_stopped(
73466498 TH	144	netdev_get_tx_queue(qdisc_dev(sch), curband))) {
8e3af978 JP	145	qdisc = q->queues[curband];
	146	skb = qdisc->ops->peek(qdisc);
	147	if (skb)
	148	return skb;
	149	}
	150	}
	151	return NULL;
	152
	153	}
	154
92651940 AD	155	static void
	156	multiq_reset(struct Qdisc *sch)
	157	{
	158	u16 band;
	159	struct multiq_sched_data *q = qdisc_priv(sch);
	160
	161	for (band = 0; band < q->bands; band++)
	162	qdisc_reset(q->queues[band]);
	163	sch->q.qlen = 0;
	164	q->curband = 0;
	165	}
	166
	167	static void
	168	multiq_destroy(struct Qdisc *sch)
	169	{
	170	int band;
	171	struct multiq_sched_data *q = qdisc_priv(sch);
	172
	173	tcf_destroy_chain(&q->filter_list);
	174	for (band = 0; band < q->bands; band++)
	175	qdisc_destroy(q->queues[band]);
	176
	177	kfree(q->queues);
	178	}
	179
	180	static int multiq_tune(struct Qdisc sch, struct nlattr opt)
	181	{
	182	struct multiq_sched_data *q = qdisc_priv(sch);
	183	struct tc_multiq_qopt *qopt;
	184	int i;
	185
	186	if (!netif_is_multiqueue(qdisc_dev(sch)))
149490f1	187	return -EOPNOTSUPP;
92651940 AD	188	if (nla_len(opt) < sizeof(*qopt))
	189	return -EINVAL;
	190
	191	qopt = nla_data(opt);
	192
	193	qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
	194
	195	sch_tree_lock(sch);
	196	q->bands = qopt->bands;
	197	for (i = q->bands; i < q->max_bands; i++) {
f07d1501	198	if (q->queues[i] != &noop_qdisc) {
b94c8afc PM	199	struct Qdisc *child = q->queues[i];
b94c8afc PM	200	q->queues[i] = &noop_qdisc;
2ccccf5f WC	201	qdisc_tree_reduce_backlog(child, child->q.qlen,
2ccccf5f WC	202	child->qstats.backlog);
92651940 AD	203	qdisc_destroy(child);
	204	}
	205	}
	206
	207	sch_tree_unlock(sch);
	208
	209	for (i = 0; i < q->bands; i++) {
	210	if (q->queues[i] == &noop_qdisc) {
b94c8afc	211	struct Qdisc child, old;
3511c913	212	child = qdisc_create_dflt(sch->dev_queue,
92651940 AD	213	&pfifo_qdisc_ops,
	214	TC_H_MAKE(sch->handle,
	215	i + 1));
	216	if (child) {
	217	sch_tree_lock(sch);
b94c8afc PM	218	old = q->queues[i];
b94c8afc PM	219	q->queues[i] = child;
92651940	220
b94c8afc	221	if (old != &noop_qdisc) {
2ccccf5f WC	222	qdisc_tree_reduce_backlog(old,
	223	old->q.qlen,
	224	old->qstats.backlog);
b94c8afc	225	qdisc_destroy(old);
92651940 AD	226	}
	227	sch_tree_unlock(sch);
	228	}
	229	}
	230	}
	231	return 0;
	232	}
	233
	234	static int multiq_init(struct Qdisc sch, struct nlattr opt)
	235	{
	236	struct multiq_sched_data *q = qdisc_priv(sch);
f07d1501	237	int i, err;
92651940 AD	238
	239	q->queues = NULL;
	240
	241	if (opt == NULL)
	242	return -EINVAL;
	243
	244	q->max_bands = qdisc_dev(sch)->num_tx_queues;
	245
	246	q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
	247	if (!q->queues)
	248	return -ENOBUFS;
	249	for (i = 0; i < q->max_bands; i++)
	250	q->queues[i] = &noop_qdisc;
	251
cc7ec456	252	err = multiq_tune(sch, opt);
f07d1501 AD	253
	254	if (err)
	255	kfree(q->queues);
	256
	257	return err;
92651940 AD	258	}
	259
	260	static int multiq_dump(struct Qdisc sch, struct sk_buff skb)
	261	{
	262	struct multiq_sched_data *q = qdisc_priv(sch);
	263	unsigned char *b = skb_tail_pointer(skb);
	264	struct tc_multiq_qopt opt;
	265
	266	opt.bands = q->bands;
	267	opt.max_bands = q->max_bands;
	268
1b34ec43 DM	269	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	270	goto nla_put_failure;
92651940 AD	271
	272	return skb->len;
	273
	274	nla_put_failure:
	275	nlmsg_trim(skb, b);
	276	return -1;
	277	}
	278
	279	static int multiq_graft(struct Qdisc sch, unsigned long arg, struct Qdisc new,
	280	struct Qdisc **old)
	281	{
	282	struct multiq_sched_data *q = qdisc_priv(sch);
	283	unsigned long band = arg - 1;
	284
92651940 AD	285	if (new == NULL)
	286	new = &noop_qdisc;
	287
86a7996c	288	*old = qdisc_replace(sch, new, &q->queues[band]);
92651940 AD	289	return 0;
	290	}
	291
	292	static struct Qdisc *
	293	multiq_leaf(struct Qdisc *sch, unsigned long arg)
	294	{
	295	struct multiq_sched_data *q = qdisc_priv(sch);
	296	unsigned long band = arg - 1;
	297
92651940 AD	298	return q->queues[band];
	299	}
	300
	301	static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
	302	{
	303	struct multiq_sched_data *q = qdisc_priv(sch);
	304	unsigned long band = TC_H_MIN(classid);
	305
	306	if (band - 1 >= q->bands)
	307	return 0;
	308	return band;
	309	}
	310
	311	static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
	312	u32 classid)
	313	{
	314	return multiq_get(sch, classid);
	315	}
	316
	317
	318	static void multiq_put(struct Qdisc *q, unsigned long cl)
	319	{
92651940 AD	320	}
92651940 AD	321
92651940 AD	322	static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
	323	struct sk_buff skb, struct tcmsg tcm)
	324	{
	325	struct multiq_sched_data *q = qdisc_priv(sch);
	326
92651940	327	tcm->tcm_handle \|= TC_H_MIN(cl);
cc7ec456	328	tcm->tcm_info = q->queues[cl - 1]->handle;
92651940 AD	329	return 0;
	330	}
	331
	332	static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
	333	struct gnet_dump *d)
	334	{
	335	struct multiq_sched_data *q = qdisc_priv(sch);
	336	struct Qdisc *cl_q;
	337
	338	cl_q = q->queues[cl - 1];
edb09eb1 ED	339	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
edb09eb1 ED	340	d, NULL, &cl_q->bstats) < 0 \|\|
b0ab6f92	341	gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
92651940 AD	342	return -1;
	343
	344	return 0;
	345	}
	346
	347	static void multiq_walk(struct Qdisc sch, struct qdisc_walker arg)
	348	{
	349	struct multiq_sched_data *q = qdisc_priv(sch);
	350	int band;
	351
	352	if (arg->stop)
	353	return;
	354
	355	for (band = 0; band < q->bands; band++) {
	356	if (arg->count < arg->skip) {
	357	arg->count++;
	358	continue;
	359	}
cc7ec456	360	if (arg->fn(sch, band + 1, arg) < 0) {
92651940 AD	361	arg->stop = 1;
	362	break;
	363	}
	364	arg->count++;
	365	}
	366	}
	367
25d8c0d5 JF	368	static struct tcf_proto __rcu *multiq_find_tcf(struct Qdisc sch,
25d8c0d5 JF	369	unsigned long cl)
92651940 AD	370	{
	371	struct multiq_sched_data *q = qdisc_priv(sch);
	372
	373	if (cl)
	374	return NULL;
	375	return &q->filter_list;
	376	}
	377
	378	static const struct Qdisc_class_ops multiq_class_ops = {
	379	.graft = multiq_graft,
	380	.leaf = multiq_leaf,
	381	.get = multiq_get,
	382	.put = multiq_put,
92651940 AD	383	.walk = multiq_walk,
	384	.tcf_chain = multiq_find_tcf,
	385	.bind_tcf = multiq_bind,
	386	.unbind_tcf = multiq_put,
	387	.dump = multiq_dump_class,
	388	.dump_stats = multiq_dump_class_stats,
	389	};
	390
	391	static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
	392	.next = NULL,
	393	.cl_ops = &multiq_class_ops,
	394	.id = "multiq",
	395	.priv_size = sizeof(struct multiq_sched_data),
	396	.enqueue = multiq_enqueue,
	397	.dequeue = multiq_dequeue,
8e3af978	398	.peek = multiq_peek,
92651940 AD	399	.init = multiq_init,
	400	.reset = multiq_reset,
	401	.destroy = multiq_destroy,
	402	.change = multiq_tune,
	403	.dump = multiq_dump,
	404	.owner = THIS_MODULE,
	405	};
	406
	407	static int __init multiq_module_init(void)
	408	{
	409	return register_qdisc(&multiq_qdisc_ops);
	410	}
	411
	412	static void __exit multiq_module_exit(void)
	413	{
	414	unregister_qdisc(&multiq_qdisc_ops);
	415	}
	416
	417	module_init(multiq_module_init)
	418	module_exit(multiq_module_exit)
	419
	420	MODULE_LICENSE("GPL");