[mirror_ubuntu-artful-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 offload = { 0 };
		struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
					   { .mqprio = &offload } };

		dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, 0, &tc);
	} 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 offload = *qopt;
		struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
					   { .mqprio = &offload } };

		err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle,
						    0, 0, &tc);
		if (err)
			return err;

		priv->hw_offload = offload.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_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.
		 */
		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,
	.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;
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 AN	41	if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
	42	struct tc_mqprio_qopt offload = { 0 };
	43	struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
	44	{ .mqprio = &offload } };
	45
a5fcf8a6	46	dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, 0, &tc);
56f36acd	47	} else {
b8970f0b	48	netdev_set_num_tc(dev, 0);
56f36acd	49	}
b8970f0b JF	50	}
	51
	52	static int mqprio_parse_opt(struct net_device dev, struct tc_mqprio_qopt qopt)
	53	{
	54	int i, j;
	55
	56	/* Verify num_tc is not out of max range */
	57	if (qopt->num_tc > TC_MAX_QUEUE)
	58	return -EINVAL;
	59
	60	/* Verify priority mapping uses valid tcs */
	61	for (i = 0; i < TC_BITMASK + 1; i++) {
	62	if (qopt->prio_tc_map[i] >= qopt->num_tc)
	63	return -EINVAL;
	64	}
	65
2026fecf AD	66	/* Limit qopt->hw to maximum supported offload value. Drivers have
	67	* the option of overriding this later if they don't support the a
	68	* given offload type.
	69	*/
	70	if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
	71	qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
b8970f0b	72
2026fecf AD	73	/* If hardware offload is requested we will leave it to the device
	74	* to either populate the queue counts itself or to validate the
	75	* provided queue counts. If ndo_setup_tc is not present then
	76	* hardware doesn't support offload and we should return an error.
b8970f0b JF	77	*/
b8970f0b JF	78	if (qopt->hw)
2026fecf	79	return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
b8970f0b JF	80
	81	for (i = 0; i < qopt->num_tc; i++) {
	82	unsigned int last = qopt->offset[i] + qopt->count[i];
	83
	84	/* Verify the queue count is in tx range being equal to the
	85	* real_num_tx_queues indicates the last queue is in use.
	86	*/
	87	if (qopt->offset[i] >= dev->real_num_tx_queues \|\|
	88	!qopt->count[i] \|\|
	89	last > dev->real_num_tx_queues)
	90	return -EINVAL;
	91
	92	/* Verify that the offset and counts do not overlap */
	93	for (j = i + 1; j < qopt->num_tc; j++) {
	94	if (last > qopt->offset[j])
	95	return -EINVAL;
	96	}
	97	}
	98
	99	return 0;
	100	}
	101
	102	static int mqprio_init(struct Qdisc sch, struct nlattr opt)
	103	{
	104	struct net_device *dev = qdisc_dev(sch);
	105	struct mqprio_sched *priv = qdisc_priv(sch);
	106	struct netdev_queue *dev_queue;
	107	struct Qdisc *qdisc;
	108	int i, err = -EOPNOTSUPP;
	109	struct tc_mqprio_qopt *qopt = NULL;
	110
	111	BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
	112	BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
	113
	114	if (sch->parent != TC_H_ROOT)
	115	return -EOPNOTSUPP;
	116
	117	if (!netif_is_multiqueue(dev))
	118	return -EOPNOTSUPP;
	119
7838f2ce	120	if (!opt \|\| nla_len(opt) < sizeof(*qopt))
b8970f0b JF	121	return -EINVAL;
	122
	123	qopt = nla_data(opt);
	124	if (mqprio_parse_opt(dev, qopt))
	125	return -EINVAL;
	126
	127	/* pre-allocate qdisc, attachment can't fail */
	128	priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
	129	GFP_KERNEL);
87b60cfa ED	130	if (!priv->qdiscs)
87b60cfa ED	131	return -ENOMEM;
b8970f0b JF	132
	133	for (i = 0; i < dev->num_tx_queues; i++) {
	134	dev_queue = netdev_get_tx_queue(dev, i);
1f27cde3 ED	135	qdisc = qdisc_create_dflt(dev_queue,
1f27cde3 ED	136	get_default_qdisc_ops(dev, i),
b8970f0b JF	137	TC_H_MAKE(TC_H_MAJ(sch->handle),
b8970f0b JF	138	TC_H_MIN(i + 1)));
87b60cfa ED	139	if (!qdisc)
	140	return -ENOMEM;
	141
b8970f0b	142	priv->qdiscs[i] = qdisc;
4eaf3b84	143	qdisc->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
b8970f0b JF	144	}
	145
	146	/* If the mqprio options indicate that hardware should own
	147	* the queue mapping then run ndo_setup_tc otherwise use the
	148	* supplied and verified mapping
	149	*/
	150	if (qopt->hw) {
56f36acd AN	151	struct tc_mqprio_qopt offload = *qopt;
	152	struct tc_to_netdev tc = { .type = TC_SETUP_MQPRIO,
	153	{ .mqprio = &offload } };
16e5cc64	154
a5fcf8a6 JP	155	err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle,
a5fcf8a6 JP	156	0, 0, &tc);
b8970f0b	157	if (err)
87b60cfa	158	return err;
2026fecf	159
56f36acd	160	priv->hw_offload = offload.hw;
b8970f0b JF	161	} else {
	162	netdev_set_num_tc(dev, qopt->num_tc);
	163	for (i = 0; i < qopt->num_tc; i++)
	164	netdev_set_tc_queue(dev, i,
	165	qopt->count[i], qopt->offset[i]);
	166	}
	167
	168	/* Always use supplied priority mappings */
	169	for (i = 0; i < TC_BITMASK + 1; i++)
	170	netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
	171
	172	sch->flags \|= TCQ_F_MQROOT;
	173	return 0;
b8970f0b JF	174	}
	175
	176	static void mqprio_attach(struct Qdisc *sch)
	177	{
	178	struct net_device *dev = qdisc_dev(sch);
	179	struct mqprio_sched *priv = qdisc_priv(sch);
95dc1929	180	struct Qdisc qdisc, old;
b8970f0b JF	181	unsigned int ntx;
	182
	183	/* Attach underlying qdisc */
	184	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
	185	qdisc = priv->qdiscs[ntx];
95dc1929 ED	186	old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
	187	if (old)
	188	qdisc_destroy(old);
	189	if (ntx < dev->real_num_tx_queues)
49b49971	190	qdisc_hash_add(qdisc, false);
b8970f0b JF	191	}
	192	kfree(priv->qdiscs);
	193	priv->qdiscs = NULL;
	194	}
	195
	196	static struct netdev_queue mqprio_queue_get(struct Qdisc sch,
	197	unsigned long cl)
	198	{
	199	struct net_device *dev = qdisc_dev(sch);
	200	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
	201
	202	if (ntx >= dev->num_tx_queues)
	203	return NULL;
	204	return netdev_get_tx_queue(dev, ntx);
	205	}
	206
	207	static int mqprio_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,
	208	struct Qdisc **old)
	209	{
	210	struct net_device *dev = qdisc_dev(sch);
	211	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	212
	213	if (!dev_queue)
	214	return -EINVAL;
	215
	216	if (dev->flags & IFF_UP)
	217	dev_deactivate(dev);
	218
	219	*old = dev_graft_qdisc(dev_queue, new);
	220
1abbe139	221	if (new)
4eaf3b84	222	new->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
1abbe139	223
b8970f0b JF	224	if (dev->flags & IFF_UP)
	225	dev_activate(dev);
	226
	227	return 0;
	228	}
	229
	230	static int mqprio_dump(struct Qdisc sch, struct sk_buff skb)
	231	{
	232	struct net_device *dev = qdisc_dev(sch);
	233	struct mqprio_sched *priv = qdisc_priv(sch);
	234	unsigned char *b = skb_tail_pointer(skb);
144ce879	235	struct tc_mqprio_qopt opt = { 0 };
b8970f0b JF	236	struct Qdisc *qdisc;
	237	unsigned int i;
	238
	239	sch->q.qlen = 0;
	240	memset(&sch->bstats, 0, sizeof(sch->bstats));
	241	memset(&sch->qstats, 0, sizeof(sch->qstats));
	242
	243	for (i = 0; i < dev->num_tx_queues; i++) {
46e5da40	244	qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
b8970f0b JF	245	spin_lock_bh(qdisc_lock(qdisc));
	246	sch->q.qlen += qdisc->q.qlen;
	247	sch->bstats.bytes += qdisc->bstats.bytes;
	248	sch->bstats.packets += qdisc->bstats.packets;
b8970f0b JF	249	sch->qstats.backlog += qdisc->qstats.backlog;
	250	sch->qstats.drops += qdisc->qstats.drops;
	251	sch->qstats.requeues += qdisc->qstats.requeues;
	252	sch->qstats.overlimits += qdisc->qstats.overlimits;
	253	spin_unlock_bh(qdisc_lock(qdisc));
	254	}
	255
	256	opt.num_tc = netdev_get_num_tc(dev);
	257	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
2026fecf	258	opt.hw = priv->hw_offload;
b8970f0b JF	259
	260	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	261	opt.count[i] = dev->tc_to_txq[i].count;
	262	opt.offset[i] = dev->tc_to_txq[i].offset;
	263	}
	264
1b34ec43 DM	265	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	266	goto nla_put_failure;
b8970f0b JF	267
	268	return skb->len;
	269	nla_put_failure:
	270	nlmsg_trim(skb, b);
	271	return -1;
	272	}
	273
	274	static struct Qdisc mqprio_leaf(struct Qdisc sch, unsigned long cl)
	275	{
	276	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	277
	278	if (!dev_queue)
	279	return NULL;
	280
	281	return dev_queue->qdisc_sleeping;
	282	}
	283
	284	static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
	285	{
	286	struct net_device *dev = qdisc_dev(sch);
	287	unsigned int ntx = TC_H_MIN(classid);
	288
	289	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
	290	return 0;
	291	return ntx;
	292	}
	293
	294	static void mqprio_put(struct Qdisc *sch, unsigned long cl)
	295	{
	296	}
	297
	298	static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
	299	struct sk_buff skb, struct tcmsg tcm)
	300	{
	301	struct net_device *dev = qdisc_dev(sch);
	302
	303	if (cl <= netdev_get_num_tc(dev)) {
	304	tcm->tcm_parent = TC_H_ROOT;
	305	tcm->tcm_info = 0;
	306	} else {
	307	int i;
	308	struct netdev_queue *dev_queue;
	309
	310	dev_queue = mqprio_queue_get(sch, cl);
	311	tcm->tcm_parent = 0;
	312	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	313	struct netdev_tc_txq tc = dev->tc_to_txq[i];
	314	int q_idx = cl - netdev_get_num_tc(dev);
	315
	316	if (q_idx > tc.offset &&
	317	q_idx <= tc.offset + tc.count) {
	318	tcm->tcm_parent =
	319	TC_H_MAKE(TC_H_MAJ(sch->handle),
	320	TC_H_MIN(i + 1));
	321	break;
	322	}
	323	}
	324	tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	325	}
	326	tcm->tcm_handle \|= TC_H_MIN(cl);
	327	return 0;
	328	}
	329
	330	static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
ea18fd95	331	struct gnet_dump *d)
	332	__releases(d->lock)
	333	__acquires(d->lock)
b8970f0b JF	334	{
	335	struct net_device *dev = qdisc_dev(sch);
	336
	337	if (cl <= netdev_get_num_tc(dev)) {
	338	int i;
64015853	339	__u32 qlen = 0;
b8970f0b JF	340	struct Qdisc *qdisc;
	341	struct gnet_stats_queue qstats = {0};
	342	struct gnet_stats_basic_packed bstats = {0};
	343	struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
	344
	345	/* Drop lock here it will be reclaimed before touching
	346	* statistics this is required because the d->lock we
	347	* hold here is the look on dev_queue->qdisc_sleeping
	348	* also acquired below.
	349	*/
edb09eb1 ED	350	if (d->lock)
edb09eb1 ED	351	spin_unlock_bh(d->lock);
b8970f0b JF	352
b8970f0b JF	353	for (i = tc.offset; i < tc.offset + tc.count; i++) {
46e5da40 JF	354	struct netdev_queue *q = netdev_get_tx_queue(dev, i);
	355
	356	qdisc = rtnl_dereference(q->qdisc);
b8970f0b	357	spin_lock_bh(qdisc_lock(qdisc));
64015853	358	qlen += qdisc->q.qlen;
b8970f0b JF	359	bstats.bytes += qdisc->bstats.bytes;
b8970f0b JF	360	bstats.packets += qdisc->bstats.packets;
b8970f0b JF	361	qstats.backlog += qdisc->qstats.backlog;
	362	qstats.drops += qdisc->qstats.drops;
	363	qstats.requeues += qdisc->qstats.requeues;
	364	qstats.overlimits += qdisc->qstats.overlimits;
	365	spin_unlock_bh(qdisc_lock(qdisc));
	366	}
	367	/* Reclaim root sleeping lock before completing stats */
edb09eb1 ED	368	if (d->lock)
	369	spin_lock_bh(d->lock);
	370	if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 \|\|
b0ab6f92	371	gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
b8970f0b JF	372	return -1;
	373	} else {
	374	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	375
	376	sch = dev_queue->qdisc_sleeping;
edb09eb1 ED	377	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
edb09eb1 ED	378	d, NULL, &sch->bstats) < 0 \|\|
b0ab6f92 JF	379	gnet_stats_copy_queue(d, NULL,
b0ab6f92 JF	380	&sch->qstats, sch->q.qlen) < 0)
b8970f0b JF	381	return -1;
	382	}
	383	return 0;
	384	}
	385
	386	static void mqprio_walk(struct Qdisc sch, struct qdisc_walker arg)
	387	{
	388	struct net_device *dev = qdisc_dev(sch);
	389	unsigned long ntx;
	390
	391	if (arg->stop)
	392	return;
	393
	394	/* Walk hierarchy with a virtual class per tc */
	395	arg->count = arg->skip;
	396	for (ntx = arg->skip;
	397	ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
	398	ntx++) {
	399	if (arg->fn(sch, ntx + 1, arg) < 0) {
	400	arg->stop = 1;
	401	break;
	402	}
	403	arg->count++;
	404	}
	405	}
	406
	407	static const struct Qdisc_class_ops mqprio_class_ops = {
	408	.graft = mqprio_graft,
	409	.leaf = mqprio_leaf,
	410	.get = mqprio_get,
	411	.put = mqprio_put,
	412	.walk = mqprio_walk,
	413	.dump = mqprio_dump_class,
	414	.dump_stats = mqprio_dump_class_stats,
	415	};
	416
ea18fd95	417	static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
b8970f0b JF	418	.cl_ops = &mqprio_class_ops,
	419	.id = "mqprio",
	420	.priv_size = sizeof(struct mqprio_sched),
	421	.init = mqprio_init,
	422	.destroy = mqprio_destroy,
	423	.attach = mqprio_attach,
	424	.dump = mqprio_dump,
	425	.owner = THIS_MODULE,
	426	};
	427
	428	static int __init mqprio_module_init(void)
	429	{
	430	return register_qdisc(&mqprio_qdisc_ops);
	431	}
	432
	433	static void __exit mqprio_module_exit(void)
	434	{
	435	unregister_qdisc(&mqprio_qdisc_ops);
	436	}
	437
	438	module_init(mqprio_module_init);
	439	module_exit(mqprio_module_exit);
	440
	441	MODULE_LICENSE("GPL");