[people/arne_f/kernel.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_offload;
};

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_offload && dev->netdev_ops->ndo_setup_tc) {
		struct tc_mqprio_qopt mqprio = {};

		dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_MQPRIO, &mqprio);
	} 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;
	}

	/* Limit qopt->hw to maximum supported offload value.  Drivers have
	 * the option of overriding this later if they don't support the a
	 * given offload type.
	 */
	if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
		qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;

	/* If hardware offload is requested we will leave it to the device
	 * to either populate the queue counts itself or to validate the
	 * provided queue counts.  If ndo_setup_tc is not present then
	 * hardware doesn't support offload and we should return an error.
	 */
	if (qopt->hw)
		return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;

	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)
		return -ENOMEM;

	for (i = 0; i < dev->num_tx_queues; i++) {
		dev_queue = netdev_get_tx_queue(dev, i);
		qdisc = qdisc_create_dflt(dev_queue,
					  get_default_qdisc_ops(dev, i),
					  TC_H_MAKE(TC_H_MAJ(sch->handle),
						    TC_H_MIN(i + 1)));
		if (!qdisc)
			return -ENOMEM;

		priv->qdiscs[i] = qdisc;
		qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
	}

	/* 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) {
		struct tc_mqprio_qopt mqprio = *qopt;

		err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_MQPRIO,
						    &mqprio);
		if (err)
			return err;

		priv->hw_offload = mqprio.hw;
	} 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;
}

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_hash_add(qdisc, false);
	}
	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 | TCQ_F_NOPARENT;

	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_offload;

	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_find(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 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.
		 */
		if (d->lock)
			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 */
		if (d->lock)
			spin_lock_bh(d->lock);
		if (gnet_stats_copy_basic(NULL, 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(qdisc_root_sleeping_running(sch),
					  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,
	.find		= mqprio_find,
	.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;
2026fecf	24	int hw_offload;
b8970f0b JF	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	40
56f36acd	41	if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
de4784ca	42	struct tc_mqprio_qopt mqprio = {};
56f36acd	43
de4784ca	44	dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_MQPRIO, &mqprio);
56f36acd	45	} else {
b8970f0b	46	netdev_set_num_tc(dev, 0);
56f36acd	47	}
b8970f0b JF	48	}
	49
	50	static int mqprio_parse_opt(struct net_device dev, struct tc_mqprio_qopt qopt)
	51	{
	52	int i, j;
	53
	54	/* Verify num_tc is not out of max range */
	55	if (qopt->num_tc > TC_MAX_QUEUE)
	56	return -EINVAL;
	57
	58	/* Verify priority mapping uses valid tcs */
	59	for (i = 0; i < TC_BITMASK + 1; i++) {
	60	if (qopt->prio_tc_map[i] >= qopt->num_tc)
	61	return -EINVAL;
	62	}
	63
2026fecf AD	64	/* Limit qopt->hw to maximum supported offload value. Drivers have
	65	* the option of overriding this later if they don't support the a
	66	* given offload type.
	67	*/
	68	if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
	69	qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
b8970f0b	70
2026fecf AD	71	/* If hardware offload is requested we will leave it to the device
	72	* to either populate the queue counts itself or to validate the
	73	* provided queue counts. If ndo_setup_tc is not present then
	74	* hardware doesn't support offload and we should return an error.
b8970f0b JF	75	*/
b8970f0b JF	76	if (qopt->hw)
2026fecf	77	return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
b8970f0b JF	78
	79	for (i = 0; i < qopt->num_tc; i++) {
	80	unsigned int last = qopt->offset[i] + qopt->count[i];
	81
	82	/* Verify the queue count is in tx range being equal to the
	83	* real_num_tx_queues indicates the last queue is in use.
	84	*/
	85	if (qopt->offset[i] >= dev->real_num_tx_queues \|\|
	86	!qopt->count[i] \|\|
	87	last > dev->real_num_tx_queues)
	88	return -EINVAL;
	89
	90	/* Verify that the offset and counts do not overlap */
	91	for (j = i + 1; j < qopt->num_tc; j++) {
	92	if (last > qopt->offset[j])
	93	return -EINVAL;
	94	}
	95	}
	96
	97	return 0;
	98	}
	99
	100	static int mqprio_init(struct Qdisc sch, struct nlattr opt)
	101	{
	102	struct net_device *dev = qdisc_dev(sch);
	103	struct mqprio_sched *priv = qdisc_priv(sch);
	104	struct netdev_queue *dev_queue;
	105	struct Qdisc *qdisc;
	106	int i, err = -EOPNOTSUPP;
	107	struct tc_mqprio_qopt *qopt = NULL;
	108
	109	BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
	110	BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
	111
	112	if (sch->parent != TC_H_ROOT)
	113	return -EOPNOTSUPP;
	114
	115	if (!netif_is_multiqueue(dev))
	116	return -EOPNOTSUPP;
	117
7838f2ce	118	if (!opt \|\| nla_len(opt) < sizeof(*qopt))
b8970f0b JF	119	return -EINVAL;
	120
	121	qopt = nla_data(opt);
	122	if (mqprio_parse_opt(dev, qopt))
	123	return -EINVAL;
	124
	125	/* pre-allocate qdisc, attachment can't fail */
	126	priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
	127	GFP_KERNEL);
87b60cfa ED	128	if (!priv->qdiscs)
87b60cfa ED	129	return -ENOMEM;
b8970f0b JF	130
	131	for (i = 0; i < dev->num_tx_queues; i++) {
	132	dev_queue = netdev_get_tx_queue(dev, i);
1f27cde3 ED	133	qdisc = qdisc_create_dflt(dev_queue,
1f27cde3 ED	134	get_default_qdisc_ops(dev, i),
b8970f0b JF	135	TC_H_MAKE(TC_H_MAJ(sch->handle),
b8970f0b JF	136	TC_H_MIN(i + 1)));
87b60cfa ED	137	if (!qdisc)
	138	return -ENOMEM;
	139
b8970f0b	140	priv->qdiscs[i] = qdisc;
4eaf3b84	141	qdisc->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
b8970f0b JF	142	}
	143
	144	/* If the mqprio options indicate that hardware should own
	145	* the queue mapping then run ndo_setup_tc otherwise use the
	146	* supplied and verified mapping
	147	*/
	148	if (qopt->hw) {
de4784ca	149	struct tc_mqprio_qopt mqprio = *qopt;
16e5cc64	150
de4784ca JP	151	err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_MQPRIO,
de4784ca JP	152	&mqprio);
b8970f0b	153	if (err)
87b60cfa	154	return err;
2026fecf	155
de4784ca	156	priv->hw_offload = mqprio.hw;
b8970f0b JF	157	} else {
	158	netdev_set_num_tc(dev, qopt->num_tc);
	159	for (i = 0; i < qopt->num_tc; i++)
	160	netdev_set_tc_queue(dev, i,
	161	qopt->count[i], qopt->offset[i]);
	162	}
	163
	164	/* Always use supplied priority mappings */
	165	for (i = 0; i < TC_BITMASK + 1; i++)
	166	netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
	167
	168	sch->flags \|= TCQ_F_MQROOT;
	169	return 0;
b8970f0b JF	170	}
	171
	172	static void mqprio_attach(struct Qdisc *sch)
	173	{
	174	struct net_device *dev = qdisc_dev(sch);
	175	struct mqprio_sched *priv = qdisc_priv(sch);
95dc1929	176	struct Qdisc qdisc, old;
b8970f0b JF	177	unsigned int ntx;
	178
	179	/* Attach underlying qdisc */
	180	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
	181	qdisc = priv->qdiscs[ntx];
95dc1929 ED	182	old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
	183	if (old)
	184	qdisc_destroy(old);
	185	if (ntx < dev->real_num_tx_queues)
49b49971	186	qdisc_hash_add(qdisc, false);
b8970f0b JF	187	}
	188	kfree(priv->qdiscs);
	189	priv->qdiscs = NULL;
	190	}
	191
	192	static struct netdev_queue mqprio_queue_get(struct Qdisc sch,
	193	unsigned long cl)
	194	{
	195	struct net_device *dev = qdisc_dev(sch);
	196	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
	197
	198	if (ntx >= dev->num_tx_queues)
	199	return NULL;
	200	return netdev_get_tx_queue(dev, ntx);
	201	}
	202
	203	static int mqprio_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,
	204	struct Qdisc **old)
	205	{
	206	struct net_device *dev = qdisc_dev(sch);
	207	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	208
	209	if (!dev_queue)
	210	return -EINVAL;
	211
	212	if (dev->flags & IFF_UP)
	213	dev_deactivate(dev);
	214
	215	*old = dev_graft_qdisc(dev_queue, new);
	216
1abbe139	217	if (new)
4eaf3b84	218	new->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
1abbe139	219
b8970f0b JF	220	if (dev->flags & IFF_UP)
	221	dev_activate(dev);
	222
	223	return 0;
	224	}
	225
	226	static int mqprio_dump(struct Qdisc sch, struct sk_buff skb)
	227	{
	228	struct net_device *dev = qdisc_dev(sch);
	229	struct mqprio_sched *priv = qdisc_priv(sch);
	230	unsigned char *b = skb_tail_pointer(skb);
144ce879	231	struct tc_mqprio_qopt opt = { 0 };
b8970f0b JF	232	struct Qdisc *qdisc;
	233	unsigned int i;
	234
	235	sch->q.qlen = 0;
	236	memset(&sch->bstats, 0, sizeof(sch->bstats));
	237	memset(&sch->qstats, 0, sizeof(sch->qstats));
	238
	239	for (i = 0; i < dev->num_tx_queues; i++) {
46e5da40	240	qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
b8970f0b JF	241	spin_lock_bh(qdisc_lock(qdisc));
	242	sch->q.qlen += qdisc->q.qlen;
	243	sch->bstats.bytes += qdisc->bstats.bytes;
	244	sch->bstats.packets += qdisc->bstats.packets;
b8970f0b JF	245	sch->qstats.backlog += qdisc->qstats.backlog;
	246	sch->qstats.drops += qdisc->qstats.drops;
	247	sch->qstats.requeues += qdisc->qstats.requeues;
	248	sch->qstats.overlimits += qdisc->qstats.overlimits;
	249	spin_unlock_bh(qdisc_lock(qdisc));
	250	}
	251
	252	opt.num_tc = netdev_get_num_tc(dev);
	253	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
2026fecf	254	opt.hw = priv->hw_offload;
b8970f0b JF	255
	256	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	257	opt.count[i] = dev->tc_to_txq[i].count;
	258	opt.offset[i] = dev->tc_to_txq[i].offset;
	259	}
	260
1b34ec43 DM	261	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	262	goto nla_put_failure;
b8970f0b JF	263
	264	return skb->len;
	265	nla_put_failure:
	266	nlmsg_trim(skb, b);
	267	return -1;
	268	}
	269
	270	static struct Qdisc mqprio_leaf(struct Qdisc sch, unsigned long cl)
	271	{
	272	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	273
	274	if (!dev_queue)
	275	return NULL;
	276
	277	return dev_queue->qdisc_sleeping;
	278	}
	279
143976ce	280	static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
b8970f0b JF	281	{
	282	struct net_device *dev = qdisc_dev(sch);
	283	unsigned int ntx = TC_H_MIN(classid);
	284
	285	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
	286	return 0;
	287	return ntx;
	288	}
	289
b8970f0b JF	290	static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
	291	struct sk_buff skb, struct tcmsg tcm)
	292	{
	293	struct net_device *dev = qdisc_dev(sch);
	294
	295	if (cl <= netdev_get_num_tc(dev)) {
	296	tcm->tcm_parent = TC_H_ROOT;
	297	tcm->tcm_info = 0;
	298	} else {
	299	int i;
	300	struct netdev_queue *dev_queue;
	301
	302	dev_queue = mqprio_queue_get(sch, cl);
	303	tcm->tcm_parent = 0;
	304	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	305	struct netdev_tc_txq tc = dev->tc_to_txq[i];
	306	int q_idx = cl - netdev_get_num_tc(dev);
	307
	308	if (q_idx > tc.offset &&
	309	q_idx <= tc.offset + tc.count) {
	310	tcm->tcm_parent =
	311	TC_H_MAKE(TC_H_MAJ(sch->handle),
	312	TC_H_MIN(i + 1));
	313	break;
	314	}
	315	}
	316	tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	317	}
	318	tcm->tcm_handle \|= TC_H_MIN(cl);
	319	return 0;
	320	}
	321
	322	static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
ea18fd95	323	struct gnet_dump *d)
	324	__releases(d->lock)
	325	__acquires(d->lock)
b8970f0b JF	326	{
	327	struct net_device *dev = qdisc_dev(sch);
	328
	329	if (cl <= netdev_get_num_tc(dev)) {
	330	int i;
64015853	331	__u32 qlen = 0;
b8970f0b JF	332	struct Qdisc *qdisc;
	333	struct gnet_stats_queue qstats = {0};
	334	struct gnet_stats_basic_packed bstats = {0};
	335	struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
	336
	337	/* Drop lock here it will be reclaimed before touching
	338	* statistics this is required because the d->lock we
	339	* hold here is the look on dev_queue->qdisc_sleeping
	340	* also acquired below.
	341	*/
edb09eb1 ED	342	if (d->lock)
edb09eb1 ED	343	spin_unlock_bh(d->lock);
b8970f0b JF	344
b8970f0b JF	345	for (i = tc.offset; i < tc.offset + tc.count; i++) {
46e5da40 JF	346	struct netdev_queue *q = netdev_get_tx_queue(dev, i);
	347
	348	qdisc = rtnl_dereference(q->qdisc);
b8970f0b	349	spin_lock_bh(qdisc_lock(qdisc));
64015853	350	qlen += qdisc->q.qlen;
b8970f0b JF	351	bstats.bytes += qdisc->bstats.bytes;
b8970f0b JF	352	bstats.packets += qdisc->bstats.packets;
b8970f0b JF	353	qstats.backlog += qdisc->qstats.backlog;
	354	qstats.drops += qdisc->qstats.drops;
	355	qstats.requeues += qdisc->qstats.requeues;
	356	qstats.overlimits += qdisc->qstats.overlimits;
	357	spin_unlock_bh(qdisc_lock(qdisc));
	358	}
	359	/* Reclaim root sleeping lock before completing stats */
edb09eb1 ED	360	if (d->lock)
	361	spin_lock_bh(d->lock);
	362	if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 \|\|
b0ab6f92	363	gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
b8970f0b JF	364	return -1;
	365	} else {
	366	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	367
	368	sch = dev_queue->qdisc_sleeping;
edb09eb1 ED	369	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
edb09eb1 ED	370	d, NULL, &sch->bstats) < 0 \|\|
b0ab6f92 JF	371	gnet_stats_copy_queue(d, NULL,
b0ab6f92 JF	372	&sch->qstats, sch->q.qlen) < 0)
b8970f0b JF	373	return -1;
	374	}
	375	return 0;
	376	}
	377
	378	static void mqprio_walk(struct Qdisc sch, struct qdisc_walker arg)
	379	{
	380	struct net_device *dev = qdisc_dev(sch);
	381	unsigned long ntx;
	382
	383	if (arg->stop)
	384	return;
	385
	386	/* Walk hierarchy with a virtual class per tc */
	387	arg->count = arg->skip;
	388	for (ntx = arg->skip;
	389	ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
	390	ntx++) {
	391	if (arg->fn(sch, ntx + 1, arg) < 0) {
	392	arg->stop = 1;
	393	break;
	394	}
	395	arg->count++;
	396	}
	397	}
	398
	399	static const struct Qdisc_class_ops mqprio_class_ops = {
	400	.graft = mqprio_graft,
	401	.leaf = mqprio_leaf,
143976ce	402	.find = mqprio_find,
b8970f0b JF	403	.walk = mqprio_walk,
	404	.dump = mqprio_dump_class,
	405	.dump_stats = mqprio_dump_class_stats,
	406	};
	407
ea18fd95	408	static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
b8970f0b JF	409	.cl_ops = &mqprio_class_ops,
	410	.id = "mqprio",
	411	.priv_size = sizeof(struct mqprio_sched),
	412	.init = mqprio_init,
	413	.destroy = mqprio_destroy,
	414	.attach = mqprio_attach,
	415	.dump = mqprio_dump,
	416	.owner = THIS_MODULE,
	417	};
	418
	419	static int __init mqprio_module_init(void)
	420	{
	421	return register_qdisc(&mqprio_qdisc_ops);
	422	}
	423
	424	static void __exit mqprio_module_exit(void)
	425	{
	426	unregister_qdisc(&mqprio_qdisc_ops);
	427	}
	428
	429	module_init(mqprio_module_init);
	430	module_exit(mqprio_module_exit);
	431
	432	MODULE_LICENSE("GPL");