[linux-2.6-block.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, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
 */

#include <linux/module.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 *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;
	int err;

	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
	err = tc_classify(skb, q->filter_list, &res);
#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 Qdisc *qdisc;
	int ret;

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

		if (ret & __NET_XMIT_BYPASS)
			sch->qstats.drops++;
		kfree_skb(skb);
		return ret;
	}
#endif

	ret = qdisc_enqueue(skb, qdisc);
	if (ret == NET_XMIT_SUCCESS) {
		sch->bstats.bytes += qdisc_pkt_len(skb);
		sch->bstats.packets++;
		sch->q.qlen++;
		return NET_XMIT_SUCCESS;
	}
	if (net_xmit_drop_count(ret))
		sch->qstats.drops++;
	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_subqueue_stopped(qdisc_dev(sch), q->curband)) {
			qdisc = q->queues[q->curband];
			skb = qdisc->dequeue(qdisc);
			if (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_subqueue_stopped(qdisc_dev(sch), curband)) {
			qdisc = q->queues[curband];
			skb = qdisc->ops->peek(qdisc);
			if (skb)
				return skb;
		}
	}
	return NULL;

}

static unsigned int multiq_drop(struct Qdisc *sch)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	int band;
	unsigned int len;
	struct Qdisc *qdisc;

	for (band = q->bands-1; band >= 0; band--) {
		qdisc = q->queues[band];
		if (qdisc->ops->drop) {
			len = qdisc->ops->drop(qdisc);
			if (len != 0) {
				sch->q.qlen--;
				return len;
			}
		}
	}
	return 0;
}


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_decrease_qlen(child, child->q.qlen);
			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(qdisc_dev(sch),
						  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_decrease_qlen(old,
								 old->q.qlen);
					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;

	NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);

	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 (band >= q->bands)
		return -EINVAL;

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

	sch_tree_lock(sch);
	*old = q->queues[band];
	q->queues[band] = new;
	qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
	qdisc_reset(*old);
	sch_tree_unlock(sch);

	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;

	if (band >= q->bands)
		return NULL;

	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)
{
	return;
}

static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
			 struct nlattr **tca, unsigned long *arg)
{
	unsigned long cl = *arg;
	struct multiq_sched_data *q = qdisc_priv(sch);

	if (cl - 1 > q->bands)
		return -ENOENT;
	return 0;
}

static int multiq_delete(struct Qdisc *sch, unsigned long cl)
{
	struct multiq_sched_data *q = qdisc_priv(sch);
	if (cl - 1 > q->bands)
		return -ENOENT;
	return 0;
}


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);

	if (cl - 1 > q->bands)
		return -ENOENT;
	tcm->tcm_handle |= TC_H_MIN(cl);
	if (q->queues[cl-1])
		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(d, &cl_q->bstats) < 0 ||
	    gnet_stats_copy_queue(d, &cl_q->qstats) < 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 **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,
	.change		=	multiq_change,
	.delete		=	multiq_delete,
	.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,
	.drop		=	multiq_drop,
	.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
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* Author: Alexander Duyck <alexander.h.duyck@intel.com>
	18	*/
	19
	20	#include <linux/module.h>
	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;
	34	struct tcf_proto *filter_list;
	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;
	45	int err;
	46
	47	*qerr = NET_XMIT_SUCCESS \| __NET_XMIT_BYPASS;
	48	err = tc_classify(skb, q->filter_list, &res);
	49	#ifdef CONFIG_NET_CLS_ACT
	50	switch (err) {
	51	case TC_ACT_STOLEN:
	52	case TC_ACT_QUEUED:
	53	*qerr = NET_XMIT_SUCCESS \| __NET_XMIT_STOLEN;
	54	case TC_ACT_SHOT:
	55	return NULL;
	56	}
	57	#endif
	58	band = skb_get_queue_mapping(skb);
	59
	60	if (band >= q->bands)
	61	return q->queues[0];
	62
	63	return q->queues[band];
	64	}
65
66	static int
67	multiq_enqueue(struct sk_buff skb, struct Qdisc sch)
68	{
69	struct Qdisc *qdisc;
70	int ret;
71
72	qdisc = multiq_classify(skb, sch, &ret);
73	#ifdef CONFIG_NET_CLS_ACT
74	if (qdisc == NULL) {
75
76	if (ret & __NET_XMIT_BYPASS)
77	sch->qstats.drops++;
78	kfree_skb(skb);
79	return ret;
80	}
81	#endif
82
83	ret = qdisc_enqueue(skb, qdisc);
84	if (ret == NET_XMIT_SUCCESS) {
85	sch->bstats.bytes += qdisc_pkt_len(skb);
86	sch->bstats.packets++;
87	sch->q.qlen++;
88	return NET_XMIT_SUCCESS;
89	}
90	if (net_xmit_drop_count(ret))
91	sch->qstats.drops++;
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 AD	110	*/
	111	if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
	112	qdisc = q->queues[q->curband];
	113	skb = qdisc->dequeue(qdisc);
	114	if (skb) {
	115	sch->q.qlen--;
	116	return skb;
	117	}
	118	}
	119	}
	120	return NULL;
	121
	122	}
	123
8e3af978 JP	124	static struct sk_buff multiq_peek(struct Qdisc sch)
	125	{
	126	struct multiq_sched_data *q = qdisc_priv(sch);
	127	unsigned int curband = q->curband;
	128	struct Qdisc *qdisc;
	129	struct sk_buff *skb;
	130	int band;
	131
	132	for (band = 0; band < q->bands; band++) {
	133	/* cycle through bands to ensure fairness */
	134	curband++;
	135	if (curband >= q->bands)
	136	curband = 0;
	137
	138	/* Check that target subqueue is available before
f30ab418	139	* pulling an skb to avoid head-of-line blocking.
8e3af978 JP	140	*/
	141	if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
	142	qdisc = q->queues[curband];
	143	skb = qdisc->ops->peek(qdisc);
	144	if (skb)
	145	return skb;
	146	}
	147	}
	148	return NULL;
	149
	150	}
	151
92651940 AD	152	static unsigned int multiq_drop(struct Qdisc *sch)
	153	{
	154	struct multiq_sched_data *q = qdisc_priv(sch);
	155	int band;
	156	unsigned int len;
	157	struct Qdisc *qdisc;
	158
	159	for (band = q->bands-1; band >= 0; band--) {
	160	qdisc = q->queues[band];
	161	if (qdisc->ops->drop) {
	162	len = qdisc->ops->drop(qdisc);
	163	if (len != 0) {
	164	sch->q.qlen--;
	165	return len;
	166	}
	167	}
	168	}
	169	return 0;
	170	}
	171
	172
	173	static void
	174	multiq_reset(struct Qdisc *sch)
	175	{
	176	u16 band;
	177	struct multiq_sched_data *q = qdisc_priv(sch);
	178
	179	for (band = 0; band < q->bands; band++)
	180	qdisc_reset(q->queues[band]);
	181	sch->q.qlen = 0;
	182	q->curband = 0;
	183	}
	184
	185	static void
	186	multiq_destroy(struct Qdisc *sch)
	187	{
	188	int band;
	189	struct multiq_sched_data *q = qdisc_priv(sch);
	190
	191	tcf_destroy_chain(&q->filter_list);
	192	for (band = 0; band < q->bands; band++)
	193	qdisc_destroy(q->queues[band]);
	194
	195	kfree(q->queues);
	196	}
	197
	198	static int multiq_tune(struct Qdisc sch, struct nlattr opt)
	199	{
	200	struct multiq_sched_data *q = qdisc_priv(sch);
	201	struct tc_multiq_qopt *qopt;
	202	int i;
	203
	204	if (!netif_is_multiqueue(qdisc_dev(sch)))
149490f1	205	return -EOPNOTSUPP;
92651940 AD	206	if (nla_len(opt) < sizeof(*qopt))
	207	return -EINVAL;
	208
	209	qopt = nla_data(opt);
	210
	211	qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
	212
	213	sch_tree_lock(sch);
	214	q->bands = qopt->bands;
	215	for (i = q->bands; i < q->max_bands; i++) {
f07d1501	216	if (q->queues[i] != &noop_qdisc) {
b94c8afc PM	217	struct Qdisc *child = q->queues[i];
b94c8afc PM	218	q->queues[i] = &noop_qdisc;
92651940 AD	219	qdisc_tree_decrease_qlen(child, child->q.qlen);
	220	qdisc_destroy(child);
	221	}
	222	}
	223
	224	sch_tree_unlock(sch);
	225
	226	for (i = 0; i < q->bands; i++) {
	227	if (q->queues[i] == &noop_qdisc) {
b94c8afc	228	struct Qdisc child, old;
92651940 AD	229	child = qdisc_create_dflt(qdisc_dev(sch),
	230	sch->dev_queue,
	231	&pfifo_qdisc_ops,
	232	TC_H_MAKE(sch->handle,
	233	i + 1));
	234	if (child) {
	235	sch_tree_lock(sch);
b94c8afc PM	236	old = q->queues[i];
b94c8afc PM	237	q->queues[i] = child;
92651940	238
b94c8afc PM	239	if (old != &noop_qdisc) {
	240	qdisc_tree_decrease_qlen(old,
	241	old->q.qlen);
	242	qdisc_destroy(old);
92651940 AD	243	}
	244	sch_tree_unlock(sch);
	245	}
	246	}
	247	}
	248	return 0;
	249	}
	250
	251	static int multiq_init(struct Qdisc sch, struct nlattr opt)
	252	{
	253	struct multiq_sched_data *q = qdisc_priv(sch);
f07d1501	254	int i, err;
92651940 AD	255
	256	q->queues = NULL;
	257
	258	if (opt == NULL)
	259	return -EINVAL;
	260
	261	q->max_bands = qdisc_dev(sch)->num_tx_queues;
	262
	263	q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
	264	if (!q->queues)
	265	return -ENOBUFS;
	266	for (i = 0; i < q->max_bands; i++)
	267	q->queues[i] = &noop_qdisc;
	268
f07d1501 AD	269	err = multiq_tune(sch,opt);
	270
	271	if (err)
	272	kfree(q->queues);
	273
	274	return err;
92651940 AD	275	}
	276
	277	static int multiq_dump(struct Qdisc sch, struct sk_buff skb)
	278	{
	279	struct multiq_sched_data *q = qdisc_priv(sch);
	280	unsigned char *b = skb_tail_pointer(skb);
	281	struct tc_multiq_qopt opt;
	282
	283	opt.bands = q->bands;
	284	opt.max_bands = q->max_bands;
	285
	286	NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
	287
	288	return skb->len;
	289
	290	nla_put_failure:
	291	nlmsg_trim(skb, b);
	292	return -1;
	293	}
	294
	295	static int multiq_graft(struct Qdisc sch, unsigned long arg, struct Qdisc new,
	296	struct Qdisc **old)
	297	{
	298	struct multiq_sched_data *q = qdisc_priv(sch);
	299	unsigned long band = arg - 1;
	300
	301	if (band >= q->bands)
	302	return -EINVAL;
	303
	304	if (new == NULL)
	305	new = &noop_qdisc;
	306
	307	sch_tree_lock(sch);
	308	*old = q->queues[band];
	309	q->queues[band] = new;
	310	qdisc_tree_decrease_qlen(old, (old)->q.qlen);
	311	qdisc_reset(*old);
	312	sch_tree_unlock(sch);
	313
	314	return 0;
	315	}
	316
	317	static struct Qdisc *
	318	multiq_leaf(struct Qdisc *sch, unsigned long arg)
	319	{
	320	struct multiq_sched_data *q = qdisc_priv(sch);
	321	unsigned long band = arg - 1;
	322
	323	if (band >= q->bands)
	324	return NULL;
	325
	326	return q->queues[band];
	327	}
	328
	329	static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
	330	{
	331	struct multiq_sched_data *q = qdisc_priv(sch);
	332	unsigned long band = TC_H_MIN(classid);
	333
	334	if (band - 1 >= q->bands)
	335	return 0;
	336	return band;
	337	}
	338
339	static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
340	u32 classid)
341	{
342	return multiq_get(sch, classid);
343	}
344
345
346	static void multiq_put(struct Qdisc *q, unsigned long cl)
347	{
348	return;
349	}
350
351	static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
352	struct nlattr *tca, unsigned long arg)
353	{
354	unsigned long cl = *arg;
355	struct multiq_sched_data *q = qdisc_priv(sch);
356
357	if (cl - 1 > q->bands)
358	return -ENOENT;
359	return 0;
360	}
361
362	static int multiq_delete(struct Qdisc *sch, unsigned long cl)
363	{
364	struct multiq_sched_data *q = qdisc_priv(sch);
365	if (cl - 1 > q->bands)
366	return -ENOENT;
367	return 0;
368	}
369
370
371	static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
372	struct sk_buff skb, struct tcmsg tcm)
373	{
374	struct multiq_sched_data *q = qdisc_priv(sch);
375
376	if (cl - 1 > q->bands)
377	return -ENOENT;
378	tcm->tcm_handle \|= TC_H_MIN(cl);
379	if (q->queues[cl-1])
380	tcm->tcm_info = q->queues[cl-1]->handle;
381	return 0;
382	}
383
384	static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
385	struct gnet_dump *d)
386	{
387	struct multiq_sched_data *q = qdisc_priv(sch);
388	struct Qdisc *cl_q;
389
390	cl_q = q->queues[cl - 1];
391	if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 \|\|
392	gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
393	return -1;
394
395	return 0;
396	}
397
398	static void multiq_walk(struct Qdisc sch, struct qdisc_walker arg)
399	{
400	struct multiq_sched_data *q = qdisc_priv(sch);
401	int band;
402
403	if (arg->stop)
404	return;
405
406	for (band = 0; band < q->bands; band++) {
407	if (arg->count < arg->skip) {
408	arg->count++;
409	continue;
410	}
411	if (arg->fn(sch, band+1, arg) < 0) {
412	arg->stop = 1;
413	break;
414	}
415	arg->count++;
416	}
417	}
418
419	static struct tcf_proto *multiq_find_tcf(struct Qdisc sch, unsigned long cl)
420	{
421	struct multiq_sched_data *q = qdisc_priv(sch);
422
423	if (cl)
424	return NULL;
425	return &q->filter_list;
426	}
427
428	static const struct Qdisc_class_ops multiq_class_ops = {
429	.graft = multiq_graft,
430	.leaf = multiq_leaf,
431	.get = multiq_get,
432	.put = multiq_put,
433	.change = multiq_change,
434	.delete = multiq_delete,
435	.walk = multiq_walk,
436	.tcf_chain = multiq_find_tcf,
437	.bind_tcf = multiq_bind,
438	.unbind_tcf = multiq_put,
439	.dump = multiq_dump_class,
440	.dump_stats = multiq_dump_class_stats,
441	};
442
443	static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
444	.next = NULL,
445	.cl_ops = &multiq_class_ops,
446	.id = "multiq",
447	.priv_size = sizeof(struct multiq_sched_data),
448	.enqueue = multiq_enqueue,
449	.dequeue = multiq_dequeue,
8e3af978	450	.peek = multiq_peek,
92651940 AD	451	.drop = multiq_drop,
	452	.init = multiq_init,
	453	.reset = multiq_reset,
	454	.destroy = multiq_destroy,
	455	.change = multiq_tune,
	456	.dump = multiq_dump,
	457	.owner = THIS_MODULE,
	458	};
	459
	460	static int __init multiq_module_init(void)
	461	{
	462	return register_qdisc(&multiq_qdisc_ops);
	463	}
	464
	465	static void __exit multiq_module_exit(void)
	466	{
	467	unregister_qdisc(&multiq_qdisc_ops);
	468	}
	469
	470	module_init(multiq_module_init)
	471	module_exit(multiq_module_exit)
	472
	473	MODULE_LICENSE("GPL");