[linux-2.6-block.git] / net / sched / sch_mqprio.c

/*
 * net/sched/sch_mqprio.c
 *
 * Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

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

struct mqprio_sched {
	struct Qdisc		**qdiscs;
	int hw_owned;
};

static void mqprio_destroy(struct Qdisc *sch)
{
	struct net_device *dev = qdisc_dev(sch);
	struct mqprio_sched *priv = qdisc_priv(sch);
	unsigned int ntx;

	if (priv->qdiscs) {
		for (ntx = 0;
		     ntx < dev->num_tx_queues && priv->qdiscs[ntx];
		     ntx++)
			qdisc_destroy(priv->qdiscs[ntx]);
		kfree(priv->qdiscs);
	}

	if (priv->hw_owned && dev->netdev_ops->ndo_setup_tc)
		dev->netdev_ops->ndo_setup_tc(dev, 0);
	else
		netdev_set_num_tc(dev, 0);
}

static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
{
	int i, j;

	/* Verify num_tc is not out of max range */
	if (qopt->num_tc > TC_MAX_QUEUE)
		return -EINVAL;

	/* Verify priority mapping uses valid tcs */
	for (i = 0; i < TC_BITMASK + 1; i++) {
		if (qopt->prio_tc_map[i] >= qopt->num_tc)
			return -EINVAL;
	}

	/* net_device does not support requested operation */
	if (qopt->hw && !dev->netdev_ops->ndo_setup_tc)
		return -EINVAL;

	/* if hw owned qcount and qoffset are taken from LLD so
	 * no reason to verify them here
	 */
	if (qopt->hw)
		return 0;

	for (i = 0; i < qopt->num_tc; i++) {
		unsigned int last = qopt->offset[i] + qopt->count[i];

		/* Verify the queue count is in tx range being equal to the
		 * real_num_tx_queues indicates the last queue is in use.
		 */
		if (qopt->offset[i] >= dev->real_num_tx_queues ||
		    !qopt->count[i] ||
		    last > dev->real_num_tx_queues)
			return -EINVAL;

		/* Verify that the offset and counts do not overlap */
		for (j = i + 1; j < qopt->num_tc; j++) {
			if (last > qopt->offset[j])
				return -EINVAL;
		}
	}

	return 0;
}

static int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
{
	struct net_device *dev = qdisc_dev(sch);
	struct mqprio_sched *priv = qdisc_priv(sch);
	struct netdev_queue *dev_queue;
	struct Qdisc *qdisc;
	int i, err = -EOPNOTSUPP;
	struct tc_mqprio_qopt *qopt = NULL;

	BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
	BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);

	if (sch->parent != TC_H_ROOT)
		return -EOPNOTSUPP;

	if (!netif_is_multiqueue(dev))
		return -EOPNOTSUPP;

	if (!opt || nla_len(opt) < sizeof(*qopt))
		return -EINVAL;

	qopt = nla_data(opt);
	if (mqprio_parse_opt(dev, qopt))
		return -EINVAL;

	/* pre-allocate qdisc, attachment can't fail */
	priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
			       GFP_KERNEL);
	if (priv->qdiscs == NULL) {
		err = -ENOMEM;
		goto err;
	}

	for (i = 0; i < dev->num_tx_queues; i++) {
		dev_queue = netdev_get_tx_queue(dev, i);
		qdisc = qdisc_create_dflt(dev_queue, default_qdisc_ops,
					  TC_H_MAKE(TC_H_MAJ(sch->handle),
						    TC_H_MIN(i + 1)));
		if (qdisc == NULL) {
			err = -ENOMEM;
			goto err;
		}
		priv->qdiscs[i] = qdisc;
		qdisc->flags |= TCQ_F_ONETXQUEUE;
	}

	/* If the mqprio options indicate that hardware should own
	 * the queue mapping then run ndo_setup_tc otherwise use the
	 * supplied and verified mapping
	 */
	if (qopt->hw) {
		priv->hw_owned = 1;
		err = dev->netdev_ops->ndo_setup_tc(dev, qopt->num_tc);
		if (err)
			goto err;
	} else {
		netdev_set_num_tc(dev, qopt->num_tc);
		for (i = 0; i < qopt->num_tc; i++)
			netdev_set_tc_queue(dev, i,
					    qopt->count[i], qopt->offset[i]);
	}

	/* Always use supplied priority mappings */
	for (i = 0; i < TC_BITMASK + 1; i++)
		netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);

	sch->flags |= TCQ_F_MQROOT;
	return 0;

err:
	mqprio_destroy(sch);
	return err;
}

static void mqprio_attach(struct Qdisc *sch)
{
	struct net_device *dev = qdisc_dev(sch);
	struct mqprio_sched *priv = qdisc_priv(sch);
	struct Qdisc *qdisc, *old;
	unsigned int ntx;

	/* Attach underlying qdisc */
	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
		qdisc = priv->qdiscs[ntx];
		old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
		if (old)
			qdisc_destroy(old);
		if (ntx < dev->real_num_tx_queues)
			qdisc_list_add(qdisc);
	}
	kfree(priv->qdiscs);
	priv->qdiscs = NULL;
}

static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
					     unsigned long cl)
{
	struct net_device *dev = qdisc_dev(sch);
	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);

	if (ntx >= dev->num_tx_queues)
		return NULL;
	return netdev_get_tx_queue(dev, ntx);
}

static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
		    struct Qdisc **old)
{
	struct net_device *dev = qdisc_dev(sch);
	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);

	if (!dev_queue)
		return -EINVAL;

	if (dev->flags & IFF_UP)
		dev_deactivate(dev);

	*old = dev_graft_qdisc(dev_queue, new);

	if (new)
		new->flags |= TCQ_F_ONETXQUEUE;

	if (dev->flags & IFF_UP)
		dev_activate(dev);

	return 0;
}

static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct net_device *dev = qdisc_dev(sch);
	struct mqprio_sched *priv = qdisc_priv(sch);
	unsigned char *b = skb_tail_pointer(skb);
	struct tc_mqprio_qopt opt = { 0 };
	struct Qdisc *qdisc;
	unsigned int i;

	sch->q.qlen = 0;
	memset(&sch->bstats, 0, sizeof(sch->bstats));
	memset(&sch->qstats, 0, sizeof(sch->qstats));

	for (i = 0; i < dev->num_tx_queues; i++) {
		qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
		spin_lock_bh(qdisc_lock(qdisc));
		sch->q.qlen		+= qdisc->q.qlen;
		sch->bstats.bytes	+= qdisc->bstats.bytes;
		sch->bstats.packets	+= qdisc->bstats.packets;
		sch->qstats.backlog	+= qdisc->qstats.backlog;
		sch->qstats.drops	+= qdisc->qstats.drops;
		sch->qstats.requeues	+= qdisc->qstats.requeues;
		sch->qstats.overlimits	+= qdisc->qstats.overlimits;
		spin_unlock_bh(qdisc_lock(qdisc));
	}

	opt.num_tc = netdev_get_num_tc(dev);
	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
	opt.hw = priv->hw_owned;

	for (i = 0; i < netdev_get_num_tc(dev); i++) {
		opt.count[i] = dev->tc_to_txq[i].count;
		opt.offset[i] = dev->tc_to_txq[i].offset;
	}

	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 struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
{
	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);

	if (!dev_queue)
		return NULL;

	return dev_queue->qdisc_sleeping;
}

static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
{
	struct net_device *dev = qdisc_dev(sch);
	unsigned int ntx = TC_H_MIN(classid);

	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
		return 0;
	return ntx;
}

static void mqprio_put(struct Qdisc *sch, unsigned long cl)
{
}

static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
			 struct sk_buff *skb, struct tcmsg *tcm)
{
	struct net_device *dev = qdisc_dev(sch);

	if (cl <= netdev_get_num_tc(dev)) {
		tcm->tcm_parent = TC_H_ROOT;
		tcm->tcm_info = 0;
	} else {
		int i;
		struct netdev_queue *dev_queue;

		dev_queue = mqprio_queue_get(sch, cl);
		tcm->tcm_parent = 0;
		for (i = 0; i < netdev_get_num_tc(dev); i++) {
			struct netdev_tc_txq tc = dev->tc_to_txq[i];
			int q_idx = cl - netdev_get_num_tc(dev);

			if (q_idx > tc.offset &&
			    q_idx <= tc.offset + tc.count) {
				tcm->tcm_parent =
					TC_H_MAKE(TC_H_MAJ(sch->handle),
						  TC_H_MIN(i + 1));
				break;
			}
		}
		tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	}
	tcm->tcm_handle |= TC_H_MIN(cl);
	return 0;
}

static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
				   struct gnet_dump *d)
	__releases(d->lock)
	__acquires(d->lock)
{
	struct net_device *dev = qdisc_dev(sch);

	if (cl <= netdev_get_num_tc(dev)) {
		int i;
		__u32 qlen = 0;
		struct Qdisc *qdisc;
		struct gnet_stats_queue qstats = {0};
		struct gnet_stats_basic_packed bstats = {0};
		struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];

		/* Drop lock here it will be reclaimed before touching
		 * statistics this is required because the d->lock we
		 * hold here is the look on dev_queue->qdisc_sleeping
		 * also acquired below.
		 */
		spin_unlock_bh(d->lock);

		for (i = tc.offset; i < tc.offset + tc.count; i++) {
			struct netdev_queue *q = netdev_get_tx_queue(dev, i);

			qdisc = rtnl_dereference(q->qdisc);
			spin_lock_bh(qdisc_lock(qdisc));
			qlen		  += qdisc->q.qlen;
			bstats.bytes      += qdisc->bstats.bytes;
			bstats.packets    += qdisc->bstats.packets;
			qstats.backlog    += qdisc->qstats.backlog;
			qstats.drops      += qdisc->qstats.drops;
			qstats.requeues   += qdisc->qstats.requeues;
			qstats.overlimits += qdisc->qstats.overlimits;
			spin_unlock_bh(qdisc_lock(qdisc));
		}
		/* Reclaim root sleeping lock before completing stats */
		spin_lock_bh(d->lock);
		if (gnet_stats_copy_basic(d, NULL, &bstats) < 0 ||
		    gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
			return -1;
	} else {
		struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);

		sch = dev_queue->qdisc_sleeping;
		if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 ||
		    gnet_stats_copy_queue(d, NULL,
					  &sch->qstats, sch->q.qlen) < 0)
			return -1;
	}
	return 0;
}

static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
	struct net_device *dev = qdisc_dev(sch);
	unsigned long ntx;

	if (arg->stop)
		return;

	/* Walk hierarchy with a virtual class per tc */
	arg->count = arg->skip;
	for (ntx = arg->skip;
	     ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
	     ntx++) {
		if (arg->fn(sch, ntx + 1, arg) < 0) {
			arg->stop = 1;
			break;
		}
		arg->count++;
	}
}

static const struct Qdisc_class_ops mqprio_class_ops = {
	.graft		= mqprio_graft,
	.leaf		= mqprio_leaf,
	.get		= mqprio_get,
	.put		= mqprio_put,
	.walk		= mqprio_walk,
	.dump		= mqprio_dump_class,
	.dump_stats	= mqprio_dump_class_stats,
};

static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
	.cl_ops		= &mqprio_class_ops,
	.id		= "mqprio",
	.priv_size	= sizeof(struct mqprio_sched),
	.init		= mqprio_init,
	.destroy	= mqprio_destroy,
	.attach		= mqprio_attach,
	.dump		= mqprio_dump,
	.owner		= THIS_MODULE,
};

static int __init mqprio_module_init(void)
{
	return register_qdisc(&mqprio_qdisc_ops);
}

static void __exit mqprio_module_exit(void)
{
	unregister_qdisc(&mqprio_qdisc_ops);
}

module_init(mqprio_module_init);
module_exit(mqprio_module_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
b8970f0b JF	1	/*
	2	* net/sched/sch_mqprio.c
	3	*
	4	* Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/types.h>
	12	#include <linux/slab.h>
	13	#include <linux/kernel.h>
	14	#include <linux/string.h>
	15	#include <linux/errno.h>
	16	#include <linux/skbuff.h>
3a9a231d	17	#include <linux/module.h>
b8970f0b JF	18	#include <net/netlink.h>
	19	#include <net/pkt_sched.h>
	20	#include <net/sch_generic.h>
	21
	22	struct mqprio_sched {
	23	struct Qdisc **qdiscs;
	24	int hw_owned;
	25	};
	26
	27	static void mqprio_destroy(struct Qdisc *sch)
	28	{
	29	struct net_device *dev = qdisc_dev(sch);
	30	struct mqprio_sched *priv = qdisc_priv(sch);
	31	unsigned int ntx;
	32
ac7100ba BH	33	if (priv->qdiscs) {
	34	for (ntx = 0;
	35	ntx < dev->num_tx_queues && priv->qdiscs[ntx];
	36	ntx++)
	37	qdisc_destroy(priv->qdiscs[ntx]);
	38	kfree(priv->qdiscs);
	39	}
b8970f0b JF	40
	41	if (priv->hw_owned && dev->netdev_ops->ndo_setup_tc)
	42	dev->netdev_ops->ndo_setup_tc(dev, 0);
	43	else
	44	netdev_set_num_tc(dev, 0);
b8970f0b JF	45	}
	46
	47	static int mqprio_parse_opt(struct net_device dev, struct tc_mqprio_qopt qopt)
	48	{
	49	int i, j;
	50
	51	/* Verify num_tc is not out of max range */
	52	if (qopt->num_tc > TC_MAX_QUEUE)
	53	return -EINVAL;
	54
	55	/* Verify priority mapping uses valid tcs */
	56	for (i = 0; i < TC_BITMASK + 1; i++) {
	57	if (qopt->prio_tc_map[i] >= qopt->num_tc)
	58	return -EINVAL;
	59	}
	60
	61	/* net_device does not support requested operation */
	62	if (qopt->hw && !dev->netdev_ops->ndo_setup_tc)
	63	return -EINVAL;
	64
	65	/* if hw owned qcount and qoffset are taken from LLD so
	66	* no reason to verify them here
	67	*/
	68	if (qopt->hw)
	69	return 0;
	70
	71	for (i = 0; i < qopt->num_tc; i++) {
	72	unsigned int last = qopt->offset[i] + qopt->count[i];
	73
	74	/* Verify the queue count is in tx range being equal to the
	75	* real_num_tx_queues indicates the last queue is in use.
	76	*/
	77	if (qopt->offset[i] >= dev->real_num_tx_queues \|\|
	78	!qopt->count[i] \|\|
	79	last > dev->real_num_tx_queues)
	80	return -EINVAL;
	81
	82	/* Verify that the offset and counts do not overlap */
	83	for (j = i + 1; j < qopt->num_tc; j++) {
	84	if (last > qopt->offset[j])
	85	return -EINVAL;
	86	}
	87	}
	88
	89	return 0;
	90	}
	91
	92	static int mqprio_init(struct Qdisc sch, struct nlattr opt)
	93	{
	94	struct net_device *dev = qdisc_dev(sch);
	95	struct mqprio_sched *priv = qdisc_priv(sch);
	96	struct netdev_queue *dev_queue;
	97	struct Qdisc *qdisc;
	98	int i, err = -EOPNOTSUPP;
	99	struct tc_mqprio_qopt *qopt = NULL;
	100
	101	BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
	102	BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
	103
	104	if (sch->parent != TC_H_ROOT)
	105	return -EOPNOTSUPP;
	106
	107	if (!netif_is_multiqueue(dev))
	108	return -EOPNOTSUPP;
109
7838f2ce	110	if (!opt \|\| nla_len(opt) < sizeof(*qopt))
b8970f0b JF	111	return -EINVAL;
	112
	113	qopt = nla_data(opt);
	114	if (mqprio_parse_opt(dev, qopt))
	115	return -EINVAL;
	116
	117	/* pre-allocate qdisc, attachment can't fail */
	118	priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
	119	GFP_KERNEL);
	120	if (priv->qdiscs == NULL) {
	121	err = -ENOMEM;
	122	goto err;
	123	}
	124
	125	for (i = 0; i < dev->num_tx_queues; i++) {
	126	dev_queue = netdev_get_tx_queue(dev, i);
6da7c8fc	127	qdisc = qdisc_create_dflt(dev_queue, default_qdisc_ops,
b8970f0b JF	128	TC_H_MAKE(TC_H_MAJ(sch->handle),
	129	TC_H_MIN(i + 1)));
	130	if (qdisc == NULL) {
	131	err = -ENOMEM;
	132	goto err;
	133	}
b8970f0b	134	priv->qdiscs[i] = qdisc;
1abbe139	135	qdisc->flags \|= TCQ_F_ONETXQUEUE;
b8970f0b JF	136	}
	137
	138	/* If the mqprio options indicate that hardware should own
	139	* the queue mapping then run ndo_setup_tc otherwise use the
	140	* supplied and verified mapping
	141	*/
	142	if (qopt->hw) {
	143	priv->hw_owned = 1;
	144	err = dev->netdev_ops->ndo_setup_tc(dev, qopt->num_tc);
	145	if (err)
	146	goto err;
	147	} else {
	148	netdev_set_num_tc(dev, qopt->num_tc);
	149	for (i = 0; i < qopt->num_tc; i++)
	150	netdev_set_tc_queue(dev, i,
	151	qopt->count[i], qopt->offset[i]);
	152	}
	153
	154	/* Always use supplied priority mappings */
	155	for (i = 0; i < TC_BITMASK + 1; i++)
	156	netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
	157
	158	sch->flags \|= TCQ_F_MQROOT;
	159	return 0;
	160
	161	err:
	162	mqprio_destroy(sch);
	163	return err;
	164	}
	165
	166	static void mqprio_attach(struct Qdisc *sch)
	167	{
	168	struct net_device *dev = qdisc_dev(sch);
	169	struct mqprio_sched *priv = qdisc_priv(sch);
95dc1929	170	struct Qdisc qdisc, old;
b8970f0b JF	171	unsigned int ntx;
	172
	173	/* Attach underlying qdisc */
	174	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
	175	qdisc = priv->qdiscs[ntx];
95dc1929 ED	176	old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
	177	if (old)
	178	qdisc_destroy(old);
	179	if (ntx < dev->real_num_tx_queues)
	180	qdisc_list_add(qdisc);
b8970f0b JF	181	}
	182	kfree(priv->qdiscs);
	183	priv->qdiscs = NULL;
	184	}
	185
	186	static struct netdev_queue mqprio_queue_get(struct Qdisc sch,
	187	unsigned long cl)
	188	{
	189	struct net_device *dev = qdisc_dev(sch);
	190	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
	191
	192	if (ntx >= dev->num_tx_queues)
	193	return NULL;
	194	return netdev_get_tx_queue(dev, ntx);
	195	}
	196
	197	static int mqprio_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,
	198	struct Qdisc **old)
	199	{
	200	struct net_device *dev = qdisc_dev(sch);
	201	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	202
	203	if (!dev_queue)
	204	return -EINVAL;
	205
	206	if (dev->flags & IFF_UP)
	207	dev_deactivate(dev);
	208
	209	*old = dev_graft_qdisc(dev_queue, new);
	210
1abbe139 ED	211	if (new)
	212	new->flags \|= TCQ_F_ONETXQUEUE;
	213
b8970f0b JF	214	if (dev->flags & IFF_UP)
	215	dev_activate(dev);
	216
	217	return 0;
	218	}
	219
	220	static int mqprio_dump(struct Qdisc sch, struct sk_buff skb)
	221	{
	222	struct net_device *dev = qdisc_dev(sch);
	223	struct mqprio_sched *priv = qdisc_priv(sch);
	224	unsigned char *b = skb_tail_pointer(skb);
144ce879	225	struct tc_mqprio_qopt opt = { 0 };
b8970f0b JF	226	struct Qdisc *qdisc;
	227	unsigned int i;
	228
	229	sch->q.qlen = 0;
	230	memset(&sch->bstats, 0, sizeof(sch->bstats));
	231	memset(&sch->qstats, 0, sizeof(sch->qstats));
	232
	233	for (i = 0; i < dev->num_tx_queues; i++) {
46e5da40	234	qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
b8970f0b JF	235	spin_lock_bh(qdisc_lock(qdisc));
	236	sch->q.qlen += qdisc->q.qlen;
	237	sch->bstats.bytes += qdisc->bstats.bytes;
	238	sch->bstats.packets += qdisc->bstats.packets;
b8970f0b JF	239	sch->qstats.backlog += qdisc->qstats.backlog;
	240	sch->qstats.drops += qdisc->qstats.drops;
	241	sch->qstats.requeues += qdisc->qstats.requeues;
	242	sch->qstats.overlimits += qdisc->qstats.overlimits;
	243	spin_unlock_bh(qdisc_lock(qdisc));
	244	}
	245
	246	opt.num_tc = netdev_get_num_tc(dev);
	247	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
	248	opt.hw = priv->hw_owned;
	249
	250	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	251	opt.count[i] = dev->tc_to_txq[i].count;
	252	opt.offset[i] = dev->tc_to_txq[i].offset;
	253	}
	254
1b34ec43 DM	255	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	256	goto nla_put_failure;
b8970f0b JF	257
	258	return skb->len;
	259	nla_put_failure:
	260	nlmsg_trim(skb, b);
	261	return -1;
	262	}
	263
	264	static struct Qdisc mqprio_leaf(struct Qdisc sch, unsigned long cl)
	265	{
	266	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	267
	268	if (!dev_queue)
	269	return NULL;
	270
	271	return dev_queue->qdisc_sleeping;
	272	}
	273
	274	static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
	275	{
	276	struct net_device *dev = qdisc_dev(sch);
	277	unsigned int ntx = TC_H_MIN(classid);
	278
	279	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
	280	return 0;
	281	return ntx;
	282	}
	283
	284	static void mqprio_put(struct Qdisc *sch, unsigned long cl)
	285	{
	286	}
	287
	288	static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
	289	struct sk_buff skb, struct tcmsg tcm)
	290	{
	291	struct net_device *dev = qdisc_dev(sch);
	292
	293	if (cl <= netdev_get_num_tc(dev)) {
	294	tcm->tcm_parent = TC_H_ROOT;
	295	tcm->tcm_info = 0;
	296	} else {
	297	int i;
	298	struct netdev_queue *dev_queue;
	299
	300	dev_queue = mqprio_queue_get(sch, cl);
	301	tcm->tcm_parent = 0;
	302	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	303	struct netdev_tc_txq tc = dev->tc_to_txq[i];
	304	int q_idx = cl - netdev_get_num_tc(dev);
	305
	306	if (q_idx > tc.offset &&
	307	q_idx <= tc.offset + tc.count) {
	308	tcm->tcm_parent =
	309	TC_H_MAKE(TC_H_MAJ(sch->handle),
	310	TC_H_MIN(i + 1));
	311	break;
	312	}
	313	}
	314	tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	315	}
	316	tcm->tcm_handle \|= TC_H_MIN(cl);
	317	return 0;
	318	}
	319
	320	static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
ea18fd95	321	struct gnet_dump *d)
	322	__releases(d->lock)
	323	__acquires(d->lock)
b8970f0b JF	324	{
	325	struct net_device *dev = qdisc_dev(sch);
	326
	327	if (cl <= netdev_get_num_tc(dev)) {
	328	int i;
64015853	329	__u32 qlen = 0;
b8970f0b JF	330	struct Qdisc *qdisc;
	331	struct gnet_stats_queue qstats = {0};
	332	struct gnet_stats_basic_packed bstats = {0};
	333	struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
	334
	335	/* Drop lock here it will be reclaimed before touching
	336	* statistics this is required because the d->lock we
	337	* hold here is the look on dev_queue->qdisc_sleeping
	338	* also acquired below.
	339	*/
	340	spin_unlock_bh(d->lock);
	341
	342	for (i = tc.offset; i < tc.offset + tc.count; i++) {
46e5da40 JF	343	struct netdev_queue *q = netdev_get_tx_queue(dev, i);
	344
	345	qdisc = rtnl_dereference(q->qdisc);
b8970f0b	346	spin_lock_bh(qdisc_lock(qdisc));
64015853	347	qlen += qdisc->q.qlen;
b8970f0b JF	348	bstats.bytes += qdisc->bstats.bytes;
b8970f0b JF	349	bstats.packets += qdisc->bstats.packets;
b8970f0b JF	350	qstats.backlog += qdisc->qstats.backlog;
	351	qstats.drops += qdisc->qstats.drops;
	352	qstats.requeues += qdisc->qstats.requeues;
	353	qstats.overlimits += qdisc->qstats.overlimits;
	354	spin_unlock_bh(qdisc_lock(qdisc));
	355	}
	356	/* Reclaim root sleeping lock before completing stats */
	357	spin_lock_bh(d->lock);
22e0f8b9	358	if (gnet_stats_copy_basic(d, NULL, &bstats) < 0 \|\|
b0ab6f92	359	gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
b8970f0b JF	360	return -1;
	361	} else {
	362	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	363
	364	sch = dev_queue->qdisc_sleeping;
22e0f8b9	365	if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 \|\|
b0ab6f92 JF	366	gnet_stats_copy_queue(d, NULL,
b0ab6f92 JF	367	&sch->qstats, sch->q.qlen) < 0)
b8970f0b JF	368	return -1;
	369	}
	370	return 0;
	371	}
	372
	373	static void mqprio_walk(struct Qdisc sch, struct qdisc_walker arg)
	374	{
	375	struct net_device *dev = qdisc_dev(sch);
	376	unsigned long ntx;
	377
	378	if (arg->stop)
	379	return;
	380
	381	/* Walk hierarchy with a virtual class per tc */
	382	arg->count = arg->skip;
	383	for (ntx = arg->skip;
	384	ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
	385	ntx++) {
	386	if (arg->fn(sch, ntx + 1, arg) < 0) {
	387	arg->stop = 1;
	388	break;
	389	}
	390	arg->count++;
	391	}
	392	}
	393
	394	static const struct Qdisc_class_ops mqprio_class_ops = {
	395	.graft = mqprio_graft,
	396	.leaf = mqprio_leaf,
	397	.get = mqprio_get,
	398	.put = mqprio_put,
	399	.walk = mqprio_walk,
	400	.dump = mqprio_dump_class,
	401	.dump_stats = mqprio_dump_class_stats,
	402	};
	403
ea18fd95	404	static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
b8970f0b JF	405	.cl_ops = &mqprio_class_ops,
	406	.id = "mqprio",
	407	.priv_size = sizeof(struct mqprio_sched),
	408	.init = mqprio_init,
	409	.destroy = mqprio_destroy,
	410	.attach = mqprio_attach,
	411	.dump = mqprio_dump,
	412	.owner = THIS_MODULE,
	413	};
	414
	415	static int __init mqprio_module_init(void)
	416	{
	417	return register_qdisc(&mqprio_qdisc_ops);
	418	}
	419
	420	static void __exit mqprio_module_exit(void)
	421	{
	422	unregister_qdisc(&mqprio_qdisc_ops);
	423	}
	424
	425	module_init(mqprio_module_init);
	426	module_exit(mqprio_module_exit);
	427
	428	MODULE_LICENSE("GPL");