[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_owned;
};

static void mqprio_destroy(struct Qdisc *sch)
{
	struct net_device *dev = qdisc_dev(sch);
	struct mqprio_sched *priv = qdisc_priv(sch);
	struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO};
	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, sch->handle, 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;
	}

	/* 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)
		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_to_netdev tc = {.type = TC_SETUP_MQPRIO,
					  { .tc = qopt->num_tc }};

		priv->hw_owned = 1;
		err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
		if (err)
			return 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;
}

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);
	}
	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_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.
		 */
		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;
	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);
16e5cc64	31	struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO};
b8970f0b JF	32	unsigned int ntx;
b8970f0b JF	33
ac7100ba BH	34	if (priv->qdiscs) {
	35	for (ntx = 0;
	36	ntx < dev->num_tx_queues && priv->qdiscs[ntx];
	37	ntx++)
	38	qdisc_destroy(priv->qdiscs[ntx]);
	39	kfree(priv->qdiscs);
	40	}
b8970f0b JF	41
b8970f0b JF	42	if (priv->hw_owned && dev->netdev_ops->ndo_setup_tc)
16e5cc64	43	dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
b8970f0b JF	44	else
b8970f0b JF	45	netdev_set_num_tc(dev, 0);
b8970f0b JF	46	}
	47
	48	static int mqprio_parse_opt(struct net_device dev, struct tc_mqprio_qopt qopt)
	49	{
	50	int i, j;
	51
	52	/* Verify num_tc is not out of max range */
	53	if (qopt->num_tc > TC_MAX_QUEUE)
	54	return -EINVAL;
	55
	56	/* Verify priority mapping uses valid tcs */
	57	for (i = 0; i < TC_BITMASK + 1; i++) {
	58	if (qopt->prio_tc_map[i] >= qopt->num_tc)
	59	return -EINVAL;
	60	}
	61
	62	/* net_device does not support requested operation */
	63	if (qopt->hw && !dev->netdev_ops->ndo_setup_tc)
	64	return -EINVAL;
	65
	66	/* if hw owned qcount and qoffset are taken from LLD so
	67	* no reason to verify them here
	68	*/
	69	if (qopt->hw)
	70	return 0;
	71
	72	for (i = 0; i < qopt->num_tc; i++) {
	73	unsigned int last = qopt->offset[i] + qopt->count[i];
	74
	75	/* Verify the queue count is in tx range being equal to the
	76	* real_num_tx_queues indicates the last queue is in use.
	77	*/
	78	if (qopt->offset[i] >= dev->real_num_tx_queues \|\|
	79	!qopt->count[i] \|\|
	80	last > dev->real_num_tx_queues)
	81	return -EINVAL;
	82
	83	/* Verify that the offset and counts do not overlap */
	84	for (j = i + 1; j < qopt->num_tc; j++) {
	85	if (last > qopt->offset[j])
	86	return -EINVAL;
	87	}
	88	}
	89
	90	return 0;
	91	}
	92
	93	static int mqprio_init(struct Qdisc sch, struct nlattr opt)
	94	{
	95	struct net_device *dev = qdisc_dev(sch);
	96	struct mqprio_sched *priv = qdisc_priv(sch);
	97	struct netdev_queue *dev_queue;
	98	struct Qdisc *qdisc;
	99	int i, err = -EOPNOTSUPP;
	100	struct tc_mqprio_qopt *qopt = NULL;
	101
	102	BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
	103	BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
	104
	105	if (sch->parent != TC_H_ROOT)
	106	return -EOPNOTSUPP;
	107
	108	if (!netif_is_multiqueue(dev))
	109	return -EOPNOTSUPP;
110
7838f2ce	111	if (!opt \|\| nla_len(opt) < sizeof(*qopt))
b8970f0b JF	112	return -EINVAL;
	113
	114	qopt = nla_data(opt);
	115	if (mqprio_parse_opt(dev, qopt))
	116	return -EINVAL;
	117
	118	/* pre-allocate qdisc, attachment can't fail */
	119	priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
	120	GFP_KERNEL);
87b60cfa ED	121	if (!priv->qdiscs)
87b60cfa ED	122	return -ENOMEM;
b8970f0b JF	123
	124	for (i = 0; i < dev->num_tx_queues; i++) {
	125	dev_queue = netdev_get_tx_queue(dev, i);
1f27cde3 ED	126	qdisc = qdisc_create_dflt(dev_queue,
1f27cde3 ED	127	get_default_qdisc_ops(dev, i),
b8970f0b JF	128	TC_H_MAKE(TC_H_MAJ(sch->handle),
b8970f0b JF	129	TC_H_MIN(i + 1)));
87b60cfa ED	130	if (!qdisc)
	131	return -ENOMEM;
	132
b8970f0b	133	priv->qdiscs[i] = qdisc;
4eaf3b84	134	qdisc->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
b8970f0b JF	135	}
	136
	137	/* If the mqprio options indicate that hardware should own
	138	* the queue mapping then run ndo_setup_tc otherwise use the
	139	* supplied and verified mapping
	140	*/
	141	if (qopt->hw) {
16e5cc64	142	struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO,
241deec9	143	{ .tc = qopt->num_tc }};
16e5cc64	144
b8970f0b	145	priv->hw_owned = 1;
16e5cc64	146	err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
b8970f0b	147	if (err)
87b60cfa	148	return err;
b8970f0b JF	149	} else {
	150	netdev_set_num_tc(dev, qopt->num_tc);
	151	for (i = 0; i < qopt->num_tc; i++)
	152	netdev_set_tc_queue(dev, i,
	153	qopt->count[i], qopt->offset[i]);
	154	}
	155
	156	/* Always use supplied priority mappings */
	157	for (i = 0; i < TC_BITMASK + 1; i++)
	158	netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
	159
	160	sch->flags \|= TCQ_F_MQROOT;
	161	return 0;
b8970f0b JF	162	}
	163
	164	static void mqprio_attach(struct Qdisc *sch)
	165	{
	166	struct net_device *dev = qdisc_dev(sch);
	167	struct mqprio_sched *priv = qdisc_priv(sch);
95dc1929	168	struct Qdisc qdisc, old;
b8970f0b JF	169	unsigned int ntx;
	170
	171	/* Attach underlying qdisc */
	172	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
	173	qdisc = priv->qdiscs[ntx];
95dc1929 ED	174	old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
	175	if (old)
	176	qdisc_destroy(old);
	177	if (ntx < dev->real_num_tx_queues)
59cc1f61	178	qdisc_hash_add(qdisc);
b8970f0b JF	179	}
	180	kfree(priv->qdiscs);
	181	priv->qdiscs = NULL;
	182	}
	183
	184	static struct netdev_queue mqprio_queue_get(struct Qdisc sch,
	185	unsigned long cl)
	186	{
	187	struct net_device *dev = qdisc_dev(sch);
	188	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
	189
	190	if (ntx >= dev->num_tx_queues)
	191	return NULL;
	192	return netdev_get_tx_queue(dev, ntx);
	193	}
	194
	195	static int mqprio_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,
	196	struct Qdisc **old)
	197	{
	198	struct net_device *dev = qdisc_dev(sch);
	199	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	200
	201	if (!dev_queue)
	202	return -EINVAL;
	203
	204	if (dev->flags & IFF_UP)
	205	dev_deactivate(dev);
	206
	207	*old = dev_graft_qdisc(dev_queue, new);
	208
1abbe139	209	if (new)
4eaf3b84	210	new->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
1abbe139	211
b8970f0b JF	212	if (dev->flags & IFF_UP)
	213	dev_activate(dev);
	214
	215	return 0;
	216	}
	217
	218	static int mqprio_dump(struct Qdisc sch, struct sk_buff skb)
	219	{
	220	struct net_device *dev = qdisc_dev(sch);
	221	struct mqprio_sched *priv = qdisc_priv(sch);
	222	unsigned char *b = skb_tail_pointer(skb);
144ce879	223	struct tc_mqprio_qopt opt = { 0 };
b8970f0b JF	224	struct Qdisc *qdisc;
	225	unsigned int i;
	226
	227	sch->q.qlen = 0;
	228	memset(&sch->bstats, 0, sizeof(sch->bstats));
	229	memset(&sch->qstats, 0, sizeof(sch->qstats));
	230
	231	for (i = 0; i < dev->num_tx_queues; i++) {
46e5da40	232	qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
b8970f0b JF	233	spin_lock_bh(qdisc_lock(qdisc));
	234	sch->q.qlen += qdisc->q.qlen;
	235	sch->bstats.bytes += qdisc->bstats.bytes;
	236	sch->bstats.packets += qdisc->bstats.packets;
b8970f0b JF	237	sch->qstats.backlog += qdisc->qstats.backlog;
	238	sch->qstats.drops += qdisc->qstats.drops;
	239	sch->qstats.requeues += qdisc->qstats.requeues;
	240	sch->qstats.overlimits += qdisc->qstats.overlimits;
	241	spin_unlock_bh(qdisc_lock(qdisc));
	242	}
	243
	244	opt.num_tc = netdev_get_num_tc(dev);
	245	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
	246	opt.hw = priv->hw_owned;
	247
	248	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	249	opt.count[i] = dev->tc_to_txq[i].count;
	250	opt.offset[i] = dev->tc_to_txq[i].offset;
	251	}
	252
1b34ec43 DM	253	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	254	goto nla_put_failure;
b8970f0b JF	255
	256	return skb->len;
	257	nla_put_failure:
	258	nlmsg_trim(skb, b);
	259	return -1;
	260	}
	261
	262	static struct Qdisc mqprio_leaf(struct Qdisc sch, unsigned long cl)
	263	{
	264	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	265
	266	if (!dev_queue)
	267	return NULL;
	268
	269	return dev_queue->qdisc_sleeping;
	270	}
	271
	272	static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
	273	{
	274	struct net_device *dev = qdisc_dev(sch);
	275	unsigned int ntx = TC_H_MIN(classid);
	276
	277	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
	278	return 0;
	279	return ntx;
	280	}
	281
	282	static void mqprio_put(struct Qdisc *sch, unsigned long cl)
	283	{
	284	}
	285
	286	static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
	287	struct sk_buff skb, struct tcmsg tcm)
	288	{
	289	struct net_device *dev = qdisc_dev(sch);
	290
	291	if (cl <= netdev_get_num_tc(dev)) {
	292	tcm->tcm_parent = TC_H_ROOT;
	293	tcm->tcm_info = 0;
	294	} else {
	295	int i;
	296	struct netdev_queue *dev_queue;
	297
	298	dev_queue = mqprio_queue_get(sch, cl);
	299	tcm->tcm_parent = 0;
	300	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	301	struct netdev_tc_txq tc = dev->tc_to_txq[i];
	302	int q_idx = cl - netdev_get_num_tc(dev);
	303
	304	if (q_idx > tc.offset &&
	305	q_idx <= tc.offset + tc.count) {
	306	tcm->tcm_parent =
	307	TC_H_MAKE(TC_H_MAJ(sch->handle),
	308	TC_H_MIN(i + 1));
	309	break;
	310	}
	311	}
	312	tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	313	}
	314	tcm->tcm_handle \|= TC_H_MIN(cl);
	315	return 0;
	316	}
	317
	318	static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
ea18fd95	319	struct gnet_dump *d)
	320	__releases(d->lock)
	321	__acquires(d->lock)
b8970f0b JF	322	{
	323	struct net_device *dev = qdisc_dev(sch);
	324
	325	if (cl <= netdev_get_num_tc(dev)) {
	326	int i;
64015853	327	__u32 qlen = 0;
b8970f0b JF	328	struct Qdisc *qdisc;
	329	struct gnet_stats_queue qstats = {0};
	330	struct gnet_stats_basic_packed bstats = {0};
	331	struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
	332
	333	/* Drop lock here it will be reclaimed before touching
	334	* statistics this is required because the d->lock we
	335	* hold here is the look on dev_queue->qdisc_sleeping
	336	* also acquired below.
	337	*/
edb09eb1 ED	338	if (d->lock)
edb09eb1 ED	339	spin_unlock_bh(d->lock);
b8970f0b JF	340
b8970f0b JF	341	for (i = tc.offset; i < tc.offset + tc.count; i++) {
46e5da40 JF	342	struct netdev_queue *q = netdev_get_tx_queue(dev, i);
	343
	344	qdisc = rtnl_dereference(q->qdisc);
b8970f0b	345	spin_lock_bh(qdisc_lock(qdisc));
64015853	346	qlen += qdisc->q.qlen;
b8970f0b JF	347	bstats.bytes += qdisc->bstats.bytes;
b8970f0b JF	348	bstats.packets += qdisc->bstats.packets;
b8970f0b JF	349	qstats.backlog += qdisc->qstats.backlog;
	350	qstats.drops += qdisc->qstats.drops;
	351	qstats.requeues += qdisc->qstats.requeues;
	352	qstats.overlimits += qdisc->qstats.overlimits;
	353	spin_unlock_bh(qdisc_lock(qdisc));
	354	}
	355	/* Reclaim root sleeping lock before completing stats */
edb09eb1 ED	356	if (d->lock)
	357	spin_lock_bh(d->lock);
	358	if (gnet_stats_copy_basic(NULL, 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;
edb09eb1 ED	365	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
edb09eb1 ED	366	d, NULL, &sch->bstats) < 0 \|\|
b0ab6f92 JF	367	gnet_stats_copy_queue(d, NULL,
b0ab6f92 JF	368	&sch->qstats, sch->q.qlen) < 0)
b8970f0b JF	369	return -1;
	370	}
	371	return 0;
	372	}
	373
	374	static void mqprio_walk(struct Qdisc sch, struct qdisc_walker arg)
	375	{
	376	struct net_device *dev = qdisc_dev(sch);
	377	unsigned long ntx;
	378
	379	if (arg->stop)
	380	return;
	381
	382	/* Walk hierarchy with a virtual class per tc */
	383	arg->count = arg->skip;
	384	for (ntx = arg->skip;
	385	ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
	386	ntx++) {
	387	if (arg->fn(sch, ntx + 1, arg) < 0) {
	388	arg->stop = 1;
	389	break;
	390	}
	391	arg->count++;
	392	}
	393	}
	394
	395	static const struct Qdisc_class_ops mqprio_class_ops = {
	396	.graft = mqprio_graft,
	397	.leaf = mqprio_leaf,
	398	.get = mqprio_get,
	399	.put = mqprio_put,
	400	.walk = mqprio_walk,
	401	.dump = mqprio_dump_class,
	402	.dump_stats = mqprio_dump_class_stats,
	403	};
	404
ea18fd95	405	static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
b8970f0b JF	406	.cl_ops = &mqprio_class_ops,
	407	.id = "mqprio",
	408	.priv_size = sizeof(struct mqprio_sched),
	409	.init = mqprio_init,
	410	.destroy = mqprio_destroy,
	411	.attach = mqprio_attach,
	412	.dump = mqprio_dump,
	413	.owner = THIS_MODULE,
	414	};
	415
	416	static int __init mqprio_module_init(void)
	417	{
	418	return register_qdisc(&mqprio_qdisc_ops);
	419	}
	420
	421	static void __exit mqprio_module_exit(void)
	422	{
	423	unregister_qdisc(&mqprio_qdisc_ops);
	424	}
	425
	426	module_init(mqprio_module_init);
	427	module_exit(mqprio_module_exit);
	428
	429	MODULE_LICENSE("GPL");