[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);
	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 == 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,
					  get_default_qdisc_ops(dev, i),
					  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 | 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)
			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 | 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.
		 */
		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);
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);
	121	if (priv->qdiscs == NULL) {
	122	err = -ENOMEM;
	123	goto err;
	124	}
	125
	126	for (i = 0; i < dev->num_tx_queues; i++) {
	127	dev_queue = netdev_get_tx_queue(dev, i);
1f27cde3 ED	128	qdisc = qdisc_create_dflt(dev_queue,
1f27cde3 ED	129	get_default_qdisc_ops(dev, i),
b8970f0b JF	130	TC_H_MAKE(TC_H_MAJ(sch->handle),
	131	TC_H_MIN(i + 1)));
	132	if (qdisc == NULL) {
	133	err = -ENOMEM;
	134	goto err;
	135	}
b8970f0b	136	priv->qdiscs[i] = qdisc;
4eaf3b84	137	qdisc->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
b8970f0b JF	138	}
	139
	140	/* If the mqprio options indicate that hardware should own
	141	* the queue mapping then run ndo_setup_tc otherwise use the
	142	* supplied and verified mapping
	143	*/
	144	if (qopt->hw) {
16e5cc64	145	struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO,
241deec9	146	{ .tc = qopt->num_tc }};
16e5cc64	147
b8970f0b	148	priv->hw_owned = 1;
16e5cc64	149	err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
b8970f0b JF	150	if (err)
	151	goto err;
	152	} else {
	153	netdev_set_num_tc(dev, qopt->num_tc);
	154	for (i = 0; i < qopt->num_tc; i++)
	155	netdev_set_tc_queue(dev, i,
	156	qopt->count[i], qopt->offset[i]);
	157	}
	158
	159	/* Always use supplied priority mappings */
	160	for (i = 0; i < TC_BITMASK + 1; i++)
	161	netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
	162
	163	sch->flags \|= TCQ_F_MQROOT;
	164	return 0;
	165
	166	err:
	167	mqprio_destroy(sch);
	168	return err;
	169	}
	170
	171	static void mqprio_attach(struct Qdisc *sch)
	172	{
	173	struct net_device *dev = qdisc_dev(sch);
	174	struct mqprio_sched *priv = qdisc_priv(sch);
95dc1929	175	struct Qdisc qdisc, old;
b8970f0b JF	176	unsigned int ntx;
	177
	178	/* Attach underlying qdisc */
	179	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
	180	qdisc = priv->qdiscs[ntx];
95dc1929 ED	181	old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
	182	if (old)
	183	qdisc_destroy(old);
	184	if (ntx < dev->real_num_tx_queues)
	185	qdisc_list_add(qdisc);
b8970f0b JF	186	}
	187	kfree(priv->qdiscs);
	188	priv->qdiscs = NULL;
	189	}
	190
	191	static struct netdev_queue mqprio_queue_get(struct Qdisc sch,
	192	unsigned long cl)
	193	{
	194	struct net_device *dev = qdisc_dev(sch);
	195	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
	196
	197	if (ntx >= dev->num_tx_queues)
	198	return NULL;
	199	return netdev_get_tx_queue(dev, ntx);
	200	}
	201
	202	static int mqprio_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,
	203	struct Qdisc **old)
	204	{
	205	struct net_device *dev = qdisc_dev(sch);
	206	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	207
	208	if (!dev_queue)
	209	return -EINVAL;
	210
	211	if (dev->flags & IFF_UP)
	212	dev_deactivate(dev);
	213
	214	*old = dev_graft_qdisc(dev_queue, new);
	215
1abbe139	216	if (new)
4eaf3b84	217	new->flags \|= TCQ_F_ONETXQUEUE \| TCQ_F_NOPARENT;
1abbe139	218
b8970f0b JF	219	if (dev->flags & IFF_UP)
	220	dev_activate(dev);
	221
	222	return 0;
	223	}
	224
	225	static int mqprio_dump(struct Qdisc sch, struct sk_buff skb)
	226	{
	227	struct net_device *dev = qdisc_dev(sch);
	228	struct mqprio_sched *priv = qdisc_priv(sch);
	229	unsigned char *b = skb_tail_pointer(skb);
144ce879	230	struct tc_mqprio_qopt opt = { 0 };
b8970f0b JF	231	struct Qdisc *qdisc;
	232	unsigned int i;
	233
	234	sch->q.qlen = 0;
	235	memset(&sch->bstats, 0, sizeof(sch->bstats));
	236	memset(&sch->qstats, 0, sizeof(sch->qstats));
	237
	238	for (i = 0; i < dev->num_tx_queues; i++) {
46e5da40	239	qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
b8970f0b JF	240	spin_lock_bh(qdisc_lock(qdisc));
	241	sch->q.qlen += qdisc->q.qlen;
	242	sch->bstats.bytes += qdisc->bstats.bytes;
	243	sch->bstats.packets += qdisc->bstats.packets;
b8970f0b JF	244	sch->qstats.backlog += qdisc->qstats.backlog;
	245	sch->qstats.drops += qdisc->qstats.drops;
	246	sch->qstats.requeues += qdisc->qstats.requeues;
	247	sch->qstats.overlimits += qdisc->qstats.overlimits;
	248	spin_unlock_bh(qdisc_lock(qdisc));
	249	}
	250
	251	opt.num_tc = netdev_get_num_tc(dev);
	252	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
	253	opt.hw = priv->hw_owned;
	254
	255	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	256	opt.count[i] = dev->tc_to_txq[i].count;
	257	opt.offset[i] = dev->tc_to_txq[i].offset;
	258	}
	259
1b34ec43 DM	260	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
1b34ec43 DM	261	goto nla_put_failure;
b8970f0b JF	262
	263	return skb->len;
	264	nla_put_failure:
	265	nlmsg_trim(skb, b);
	266	return -1;
	267	}
	268
	269	static struct Qdisc mqprio_leaf(struct Qdisc sch, unsigned long cl)
	270	{
	271	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	272
	273	if (!dev_queue)
	274	return NULL;
	275
	276	return dev_queue->qdisc_sleeping;
	277	}
	278
	279	static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
	280	{
	281	struct net_device *dev = qdisc_dev(sch);
	282	unsigned int ntx = TC_H_MIN(classid);
	283
	284	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
	285	return 0;
	286	return ntx;
	287	}
	288
	289	static void mqprio_put(struct Qdisc *sch, unsigned long cl)
	290	{
	291	}
	292
	293	static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
	294	struct sk_buff skb, struct tcmsg tcm)
	295	{
	296	struct net_device *dev = qdisc_dev(sch);
	297
	298	if (cl <= netdev_get_num_tc(dev)) {
	299	tcm->tcm_parent = TC_H_ROOT;
	300	tcm->tcm_info = 0;
	301	} else {
	302	int i;
	303	struct netdev_queue *dev_queue;
	304
	305	dev_queue = mqprio_queue_get(sch, cl);
	306	tcm->tcm_parent = 0;
	307	for (i = 0; i < netdev_get_num_tc(dev); i++) {
	308	struct netdev_tc_txq tc = dev->tc_to_txq[i];
	309	int q_idx = cl - netdev_get_num_tc(dev);
	310
	311	if (q_idx > tc.offset &&
	312	q_idx <= tc.offset + tc.count) {
	313	tcm->tcm_parent =
	314	TC_H_MAKE(TC_H_MAJ(sch->handle),
	315	TC_H_MIN(i + 1));
	316	break;
	317	}
	318	}
	319	tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
	320	}
	321	tcm->tcm_handle \|= TC_H_MIN(cl);
	322	return 0;
	323	}
	324
	325	static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
ea18fd95	326	struct gnet_dump *d)
	327	__releases(d->lock)
	328	__acquires(d->lock)
b8970f0b JF	329	{
	330	struct net_device *dev = qdisc_dev(sch);
	331
	332	if (cl <= netdev_get_num_tc(dev)) {
	333	int i;
64015853	334	__u32 qlen = 0;
b8970f0b JF	335	struct Qdisc *qdisc;
	336	struct gnet_stats_queue qstats = {0};
	337	struct gnet_stats_basic_packed bstats = {0};
	338	struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
	339
	340	/* Drop lock here it will be reclaimed before touching
	341	* statistics this is required because the d->lock we
	342	* hold here is the look on dev_queue->qdisc_sleeping
	343	* also acquired below.
	344	*/
	345	spin_unlock_bh(d->lock);
	346
	347	for (i = tc.offset; i < tc.offset + tc.count; i++) {
46e5da40 JF	348	struct netdev_queue *q = netdev_get_tx_queue(dev, i);
	349
	350	qdisc = rtnl_dereference(q->qdisc);
b8970f0b	351	spin_lock_bh(qdisc_lock(qdisc));
64015853	352	qlen += qdisc->q.qlen;
b8970f0b JF	353	bstats.bytes += qdisc->bstats.bytes;
b8970f0b JF	354	bstats.packets += qdisc->bstats.packets;
b8970f0b JF	355	qstats.backlog += qdisc->qstats.backlog;
	356	qstats.drops += qdisc->qstats.drops;
	357	qstats.requeues += qdisc->qstats.requeues;
	358	qstats.overlimits += qdisc->qstats.overlimits;
	359	spin_unlock_bh(qdisc_lock(qdisc));
	360	}
	361	/* Reclaim root sleeping lock before completing stats */
	362	spin_lock_bh(d->lock);
22e0f8b9	363	if (gnet_stats_copy_basic(d, NULL, &bstats) < 0 \|\|
b0ab6f92	364	gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
b8970f0b JF	365	return -1;
	366	} else {
	367	struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
	368
	369	sch = dev_queue->qdisc_sleeping;
22e0f8b9	370	if (gnet_stats_copy_basic(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,
	402	.get = mqprio_get,
	403	.put = mqprio_put,
	404	.walk = mqprio_walk,
	405	.dump = mqprio_dump_class,
	406	.dump_stats = mqprio_dump_class_stats,
	407	};
	408
ea18fd95	409	static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
b8970f0b JF	410	.cl_ops = &mqprio_class_ops,
	411	.id = "mqprio",
	412	.priv_size = sizeof(struct mqprio_sched),
	413	.init = mqprio_init,
	414	.destroy = mqprio_destroy,
	415	.attach = mqprio_attach,
	416	.dump = mqprio_dump,
	417	.owner = THIS_MODULE,
	418	};
	419
	420	static int __init mqprio_module_init(void)
	421	{
	422	return register_qdisc(&mqprio_qdisc_ops);
	423	}
	424
	425	static void __exit mqprio_module_exit(void)
	426	{
	427	unregister_qdisc(&mqprio_qdisc_ops);
	428	}
	429
	430	module_init(mqprio_module_init);
	431	module_exit(mqprio_module_exit);
	432
	433	MODULE_LICENSE("GPL");