[mirror_ubuntu-zesty-kernel.git] / net / core / gen_stats.c

/*
 * net/core/gen_stats.c
 *
 *             This program is free software; you can redistribute it and/or
 *             modify it under the terms of the GNU General Public License
 *             as published by the Free Software Foundation; either version
 *             2 of the License, or (at your option) any later version.
 *
 * Authors:  Thomas Graf <tgraf@suug.ch>
 *           Jamal Hadi Salim
 *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * See Documentation/networking/gen_stats.txt
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/rtnetlink.h>
#include <linux/gen_stats.h>
#include <net/netlink.h>
#include <net/gen_stats.h>


static inline int
gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr)
{
	if (nla_put_64bit(d->skb, type, size, buf, padattr))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	if (d->lock)
		spin_unlock_bh(d->lock);
	kfree(d->xstats);
	d->xstats = NULL;
	d->xstats_len = 0;
	return -1;
}

/**
 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 * @skb: socket buffer to put statistics TLVs into
 * @type: TLV type for top level statistic TLV
 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
 * @xstats_type: TLV type for backward compatibility xstats TLV
 * @lock: statistics lock
 * @d: dumping handle
 * @padattr: padding attribute
 *
 * Initializes the dumping handle, grabs the statistic lock and appends
 * an empty TLV header to the socket buffer for use a container for all
 * other statistic TLVS.
 *
 * The dumping handle is marked to be in backward compatibility mode telling
 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
 *
 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
			     int xstats_type, spinlock_t *lock,
			     struct gnet_dump *d, int padattr)
	__acquires(lock)
{
	memset(d, 0, sizeof(*d));

	if (type)
		d->tail = (struct nlattr *)skb_tail_pointer(skb);
	d->skb = skb;
	d->compat_tc_stats = tc_stats_type;
	d->compat_xstats = xstats_type;
	d->padattr = padattr;
	if (lock) {
		d->lock = lock;
		spin_lock_bh(lock);
	}
	if (d->tail)
		return gnet_stats_copy(d, type, NULL, 0, padattr);

	return 0;
}
EXPORT_SYMBOL(gnet_stats_start_copy_compat);

/**
 * gnet_stats_start_copy - start dumping procedure in compatibility mode
 * @skb: socket buffer to put statistics TLVs into
 * @type: TLV type for top level statistic TLV
 * @lock: statistics lock
 * @d: dumping handle
 * @padattr: padding attribute
 *
 * Initializes the dumping handle, grabs the statistic lock and appends
 * an empty TLV header to the socket buffer for use a container for all
 * other statistic TLVS.
 *
 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
		      struct gnet_dump *d, int padattr)
{
	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
}
EXPORT_SYMBOL(gnet_stats_start_copy);

static void
__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
			    struct gnet_stats_basic_cpu __percpu *cpu)
{
	int i;

	for_each_possible_cpu(i) {
		struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
		unsigned int start;
		u64 bytes;
		u32 packets;

		do {
			start = u64_stats_fetch_begin_irq(&bcpu->syncp);
			bytes = bcpu->bstats.bytes;
			packets = bcpu->bstats.packets;
		} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));

		bstats->bytes += bytes;
		bstats->packets += packets;
	}
}

void
__gnet_stats_copy_basic(const seqcount_t *running,
			struct gnet_stats_basic_packed *bstats,
			struct gnet_stats_basic_cpu __percpu *cpu,
			struct gnet_stats_basic_packed *b)
{
	unsigned int seq;

	if (cpu) {
		__gnet_stats_copy_basic_cpu(bstats, cpu);
		return;
	}
	do {
		if (running)
			seq = read_seqcount_begin(running);
		bstats->bytes = b->bytes;
		bstats->packets = b->packets;
	} while (running && read_seqcount_retry(running, seq));
}
EXPORT_SYMBOL(__gnet_stats_copy_basic);

/**
 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
 * @running: seqcount_t pointer
 * @d: dumping handle
 * @cpu: copy statistic per cpu
 * @b: basic statistics
 *
 * Appends the basic statistics to the top level TLV created by
 * gnet_stats_start_copy().
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_basic(const seqcount_t *running,
		      struct gnet_dump *d,
		      struct gnet_stats_basic_cpu __percpu *cpu,
		      struct gnet_stats_basic_packed *b)
{
	struct gnet_stats_basic_packed bstats = {0};

	__gnet_stats_copy_basic(running, &bstats, cpu, b);

	if (d->compat_tc_stats) {
		d->tc_stats.bytes = bstats.bytes;
		d->tc_stats.packets = bstats.packets;
	}

	if (d->tail) {
		struct gnet_stats_basic sb;

		memset(&sb, 0, sizeof(sb));
		sb.bytes = bstats.bytes;
		sb.packets = bstats.packets;
		return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb),
				       TCA_STATS_PAD);
	}
	return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_basic);

/**
 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
 * @d: dumping handle
 * @rate_est: rate estimator
 *
 * Appends the rate estimator statistics to the top level TLV created by
 * gnet_stats_start_copy().
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_rate_est(struct gnet_dump *d,
			 struct net_rate_estimator __rcu **rate_est)
{
	struct gnet_stats_rate_est64 sample;
	struct gnet_stats_rate_est est;
	int res;

	if (!gen_estimator_read(rate_est, &sample))
		return 0;
	est.bps = min_t(u64, UINT_MAX, sample.bps);
	/* we have some time before reaching 2^32 packets per second */
	est.pps = sample.pps;

	if (d->compat_tc_stats) {
		d->tc_stats.bps = est.bps;
		d->tc_stats.pps = est.pps;
	}

	if (d->tail) {
		res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
				      TCA_STATS_PAD);
		if (res < 0 || est.bps == sample.bps)
			return res;
		/* emit 64bit stats only if needed */
		return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
				       sizeof(sample), TCA_STATS_PAD);
	}

	return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_rate_est);

static void
__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
			    const struct gnet_stats_queue __percpu *q)
{
	int i;

	for_each_possible_cpu(i) {
		const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);

		qstats->qlen = 0;
		qstats->backlog += qcpu->backlog;
		qstats->drops += qcpu->drops;
		qstats->requeues += qcpu->requeues;
		qstats->overlimits += qcpu->overlimits;
	}
}

static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
				    const struct gnet_stats_queue __percpu *cpu,
				    const struct gnet_stats_queue *q,
				    __u32 qlen)
{
	if (cpu) {
		__gnet_stats_copy_queue_cpu(qstats, cpu);
	} else {
		qstats->qlen = q->qlen;
		qstats->backlog = q->backlog;
		qstats->drops = q->drops;
		qstats->requeues = q->requeues;
		qstats->overlimits = q->overlimits;
	}

	qstats->qlen = qlen;
}

/**
 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
 * @d: dumping handle
 * @cpu_q: per cpu queue statistics
 * @q: queue statistics
 * @qlen: queue length statistics
 *
 * Appends the queue statistics to the top level TLV created by
 * gnet_stats_start_copy(). Using per cpu queue statistics if
 * they are available.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_queue(struct gnet_dump *d,
		      struct gnet_stats_queue __percpu *cpu_q,
		      struct gnet_stats_queue *q, __u32 qlen)
{
	struct gnet_stats_queue qstats = {0};

	__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);

	if (d->compat_tc_stats) {
		d->tc_stats.drops = qstats.drops;
		d->tc_stats.qlen = qstats.qlen;
		d->tc_stats.backlog = qstats.backlog;
		d->tc_stats.overlimits = qstats.overlimits;
	}

	if (d->tail)
		return gnet_stats_copy(d, TCA_STATS_QUEUE,
				       &qstats, sizeof(qstats),
				       TCA_STATS_PAD);

	return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_queue);

/**
 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
 * @d: dumping handle
 * @st: application specific statistics data
 * @len: length of data
 *
 * Appends the application specific statistics to the top level TLV created by
 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
 * handle is in backward compatibility mode.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
{
	if (d->compat_xstats) {
		d->xstats = kmemdup(st, len, GFP_ATOMIC);
		if (!d->xstats)
			goto err_out;
		d->xstats_len = len;
	}

	if (d->tail)
		return gnet_stats_copy(d, TCA_STATS_APP, st, len,
				       TCA_STATS_PAD);

	return 0;

err_out:
	if (d->lock)
		spin_unlock_bh(d->lock);
	d->xstats_len = 0;
	return -1;
}
EXPORT_SYMBOL(gnet_stats_copy_app);

/**
 * gnet_stats_finish_copy - finish dumping procedure
 * @d: dumping handle
 *
 * Corrects the length of the top level TLV to include all TLVs added
 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
 * if gnet_stats_start_copy_compat() was used and releases the statistics
 * lock.
 *
 * Returns 0 on success or -1 with the statistic lock released
 * if the room in the socket buffer was not sufficient.
 */
int
gnet_stats_finish_copy(struct gnet_dump *d)
{
	if (d->tail)
		d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;

	if (d->compat_tc_stats)
		if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
				    sizeof(d->tc_stats), d->padattr) < 0)
			return -1;

	if (d->compat_xstats && d->xstats) {
		if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
				    d->xstats_len, d->padattr) < 0)
			return -1;
	}

	if (d->lock)
		spin_unlock_bh(d->lock);
	kfree(d->xstats);
	d->xstats = NULL;
	d->xstats_len = 0;
	return 0;
}
EXPORT_SYMBOL(gnet_stats_finish_copy);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/core/gen_stats.c
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Thomas Graf <tgraf@suug.ch>
	10	* Jamal Hadi Salim
	11	* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	12	*
	13	* See Documentation/networking/gen_stats.txt
	14	*/
	15
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/socket.h>
	21	#include <linux/rtnetlink.h>
	22	#include <linux/gen_stats.h>
1e90474c	23	#include <net/netlink.h>
1da177e4 LT	24	#include <net/gen_stats.h>
	25
	26
	27	static inline int
9854518e	28	gnet_stats_copy(struct gnet_dump d, int type, void buf, int size, int padattr)
1da177e4	29	{
9854518e	30	if (nla_put_64bit(d->skb, type, size, buf, padattr))
14ad6647	31	goto nla_put_failure;
1da177e4 LT	32	return 0;
1da177e4 LT	33
1e90474c	34	nla_put_failure:
edb09eb1 ED	35	if (d->lock)
edb09eb1 ED	36	spin_unlock_bh(d->lock);
1c4cff0c IG	37	kfree(d->xstats);
	38	d->xstats = NULL;
	39	d->xstats_len = 0;
1da177e4 LT	40	return -1;
	41	}
	42
	43	/**
	44	* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
	45	* @skb: socket buffer to put statistics TLVs into
	46	* @type: TLV type for top level statistic TLV
	47	* @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
	48	* @xstats_type: TLV type for backward compatibility xstats TLV
	49	* @lock: statistics lock
	50	* @d: dumping handle
e0d194ad	51	* @padattr: padding attribute
1da177e4 LT	52	*
	53	* Initializes the dumping handle, grabs the statistic lock and appends
	54	* an empty TLV header to the socket buffer for use a container for all
	55	* other statistic TLVS.
	56	*
	57	* The dumping handle is marked to be in backward compatibility mode telling
	58	* all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
	59	*
	60	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	61	*/
	62	int
	63	gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
9854518e ND	64	int xstats_type, spinlock_t *lock,
9854518e ND	65	struct gnet_dump *d, int padattr)
9a429c49	66	__acquires(lock)
1da177e4 LT	67	{
1da177e4 LT	68	memset(d, 0, sizeof(*d));
4ec93edb	69
1da177e4	70	if (type)
1e90474c	71	d->tail = (struct nlattr *)skb_tail_pointer(skb);
1da177e4 LT	72	d->skb = skb;
	73	d->compat_tc_stats = tc_stats_type;
	74	d->compat_xstats = xstats_type;
9854518e	75	d->padattr = padattr;
edb09eb1 ED	76	if (lock) {
	77	d->lock = lock;
	78	spin_lock_bh(lock);
	79	}
1da177e4	80	if (d->tail)
9854518e	81	return gnet_stats_copy(d, type, NULL, 0, padattr);
1da177e4 LT	82
	83	return 0;
	84	}
9e34a5b5	85	EXPORT_SYMBOL(gnet_stats_start_copy_compat);
1da177e4 LT	86
1da177e4 LT	87	/**
9854518e	88	* gnet_stats_start_copy - start dumping procedure in compatibility mode
1da177e4 LT	89	* @skb: socket buffer to put statistics TLVs into
	90	* @type: TLV type for top level statistic TLV
	91	* @lock: statistics lock
	92	* @d: dumping handle
e0d194ad	93	* @padattr: padding attribute
1da177e4 LT	94	*
	95	* Initializes the dumping handle, grabs the statistic lock and appends
	96	* an empty TLV header to the socket buffer for use a container for all
	97	* other statistic TLVS.
	98	*
	99	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	100	*/
	101	int
	102	gnet_stats_start_copy(struct sk_buff skb, int type, spinlock_t lock,
9854518e	103	struct gnet_dump *d, int padattr)
1da177e4	104	{
9854518e	105	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
1da177e4	106	}
9e34a5b5	107	EXPORT_SYMBOL(gnet_stats_start_copy);
1da177e4	108
22e0f8b9 JF	109	static void
	110	__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
	111	struct gnet_stats_basic_cpu __percpu *cpu)
	112	{
	113	int i;
	114
	115	for_each_possible_cpu(i) {
	116	struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
	117	unsigned int start;
02c0fc1b WC	118	u64 bytes;
02c0fc1b WC	119	u32 packets;
22e0f8b9 JF	120
	121	do {
	122	start = u64_stats_fetch_begin_irq(&bcpu->syncp);
	123	bytes = bcpu->bstats.bytes;
	124	packets = bcpu->bstats.packets;
	125	} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
	126
02c0fc1b WC	127	bstats->bytes += bytes;
02c0fc1b WC	128	bstats->packets += packets;
22e0f8b9 JF	129	}
	130	}
	131
	132	void
edb09eb1 ED	133	__gnet_stats_copy_basic(const seqcount_t *running,
edb09eb1 ED	134	struct gnet_stats_basic_packed *bstats,
22e0f8b9 JF	135	struct gnet_stats_basic_cpu __percpu *cpu,
	136	struct gnet_stats_basic_packed *b)
	137	{
edb09eb1 ED	138	unsigned int seq;
edb09eb1 ED	139
22e0f8b9 JF	140	if (cpu) {
22e0f8b9 JF	141	__gnet_stats_copy_basic_cpu(bstats, cpu);
edb09eb1 ED	142	return;
	143	}
	144	do {
	145	if (running)
	146	seq = read_seqcount_begin(running);
22e0f8b9 JF	147	bstats->bytes = b->bytes;
22e0f8b9 JF	148	bstats->packets = b->packets;
edb09eb1	149	} while (running && read_seqcount_retry(running, seq));
22e0f8b9 JF	150	}
	151	EXPORT_SYMBOL(__gnet_stats_copy_basic);
	152
1da177e4 LT	153	/**
1da177e4 LT	154	* gnet_stats_copy_basic - copy basic statistics into statistic TLV
123b3652	155	* @running: seqcount_t pointer
1da177e4	156	* @d: dumping handle
b002fdcc	157	* @cpu: copy statistic per cpu
1da177e4 LT	158	* @b: basic statistics
	159	*
	160	* Appends the basic statistics to the top level TLV created by
	161	* gnet_stats_start_copy().
	162	*
	163	* Returns 0 on success or -1 with the statistic lock released
	164	* if the room in the socket buffer was not sufficient.
	165	*/
	166	int
edb09eb1 ED	167	gnet_stats_copy_basic(const seqcount_t *running,
edb09eb1 ED	168	struct gnet_dump *d,
22e0f8b9 JF	169	struct gnet_stats_basic_cpu __percpu *cpu,
22e0f8b9 JF	170	struct gnet_stats_basic_packed *b)
1da177e4	171	{
22e0f8b9 JF	172	struct gnet_stats_basic_packed bstats = {0};
22e0f8b9 JF	173
edb09eb1	174	__gnet_stats_copy_basic(running, &bstats, cpu, b);
22e0f8b9	175
1da177e4	176	if (d->compat_tc_stats) {
22e0f8b9 JF	177	d->tc_stats.bytes = bstats.bytes;
22e0f8b9 JF	178	d->tc_stats.packets = bstats.packets;
1da177e4 LT	179	}
1da177e4 LT	180
c1a8f1f1 ED	181	if (d->tail) {
c1a8f1f1 ED	182	struct gnet_stats_basic sb;
1da177e4	183
c1a8f1f1	184	memset(&sb, 0, sizeof(sb));
22e0f8b9 JF	185	sb.bytes = bstats.bytes;
22e0f8b9 JF	186	sb.packets = bstats.packets;
9854518e ND	187	return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb),
9854518e ND	188	TCA_STATS_PAD);
c1a8f1f1	189	}
1da177e4 LT	190	return 0;
1da177e4 LT	191	}
9e34a5b5	192	EXPORT_SYMBOL(gnet_stats_copy_basic);
1da177e4 LT	193
	194	/**
	195	* gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
	196	* @d: dumping handle
1c0d32fd	197	* @rate_est: rate estimator
1da177e4 LT	198	*
	199	* Appends the rate estimator statistics to the top level TLV created by
	200	* gnet_stats_start_copy().
	201	*
	202	* Returns 0 on success or -1 with the statistic lock released
	203	* if the room in the socket buffer was not sufficient.
	204	*/
	205	int
d250a5f9	206	gnet_stats_copy_rate_est(struct gnet_dump *d,
1c0d32fd	207	struct net_rate_estimator __rcu **rate_est)
1da177e4	208	{
1c0d32fd	209	struct gnet_stats_rate_est64 sample;
45203a3b ED	210	struct gnet_stats_rate_est est;
	211	int res;
	212
1c0d32fd	213	if (!gen_estimator_read(rate_est, &sample))
d250a5f9	214	return 0;
1c0d32fd	215	est.bps = min_t(u64, UINT_MAX, sample.bps);
45203a3b	216	/* we have some time before reaching 2^32 packets per second */
1c0d32fd	217	est.pps = sample.pps;
45203a3b	218
1da177e4	219	if (d->compat_tc_stats) {
45203a3b ED	220	d->tc_stats.bps = est.bps;
45203a3b ED	221	d->tc_stats.pps = est.pps;
1da177e4 LT	222	}
1da177e4 LT	223
45203a3b	224	if (d->tail) {
9854518e ND	225	res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
9854518e ND	226	TCA_STATS_PAD);
1c0d32fd	227	if (res < 0 \|\| est.bps == sample.bps)
45203a3b ED	228	return res;
45203a3b ED	229	/* emit 64bit stats only if needed */
1c0d32fd ED	230	return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
1c0d32fd ED	231	sizeof(sample), TCA_STATS_PAD);
45203a3b	232	}
1da177e4 LT	233
	234	return 0;
	235	}
9e34a5b5	236	EXPORT_SYMBOL(gnet_stats_copy_rate_est);
1da177e4	237
b0ab6f92 JF	238	static void
	239	__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
	240	const struct gnet_stats_queue __percpu *q)
	241	{
	242	int i;
	243
	244	for_each_possible_cpu(i) {
	245	const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
	246
	247	qstats->qlen = 0;
	248	qstats->backlog += qcpu->backlog;
	249	qstats->drops += qcpu->drops;
	250	qstats->requeues += qcpu->requeues;
	251	qstats->overlimits += qcpu->overlimits;
	252	}
	253	}
	254
	255	static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
	256	const struct gnet_stats_queue __percpu *cpu,
	257	const struct gnet_stats_queue *q,
	258	__u32 qlen)
	259	{
	260	if (cpu) {
	261	__gnet_stats_copy_queue_cpu(qstats, cpu);
	262	} else {
	263	qstats->qlen = q->qlen;
	264	qstats->backlog = q->backlog;
	265	qstats->drops = q->drops;
	266	qstats->requeues = q->requeues;
	267	qstats->overlimits = q->overlimits;
	268	}
	269
	270	qstats->qlen = qlen;
	271	}
	272
1da177e4 LT	273	/**
	274	* gnet_stats_copy_queue - copy queue statistics into statistics TLV
	275	* @d: dumping handle
b0ab6f92	276	* @cpu_q: per cpu queue statistics
1da177e4	277	* @q: queue statistics
64015853	278	* @qlen: queue length statistics
1da177e4 LT	279	*
1da177e4 LT	280	* Appends the queue statistics to the top level TLV created by
b0ab6f92 JF	281	* gnet_stats_start_copy(). Using per cpu queue statistics if
b0ab6f92 JF	282	* they are available.
1da177e4 LT	283	*
	284	* Returns 0 on success or -1 with the statistic lock released
	285	* if the room in the socket buffer was not sufficient.
	286	*/
	287	int
64015853	288	gnet_stats_copy_queue(struct gnet_dump *d,
b0ab6f92	289	struct gnet_stats_queue __percpu *cpu_q,
64015853	290	struct gnet_stats_queue *q, __u32 qlen)
1da177e4	291	{
b0ab6f92 JF	292	struct gnet_stats_queue qstats = {0};
	293
	294	__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
64015853	295
1da177e4	296	if (d->compat_tc_stats) {
b0ab6f92 JF	297	d->tc_stats.drops = qstats.drops;
	298	d->tc_stats.qlen = qstats.qlen;
	299	d->tc_stats.backlog = qstats.backlog;
	300	d->tc_stats.overlimits = qstats.overlimits;
1da177e4 LT	301	}
	302
	303	if (d->tail)
b0ab6f92	304	return gnet_stats_copy(d, TCA_STATS_QUEUE,
9854518e ND	305	&qstats, sizeof(qstats),
9854518e ND	306	TCA_STATS_PAD);
1da177e4 LT	307
	308	return 0;
	309	}
9e34a5b5	310	EXPORT_SYMBOL(gnet_stats_copy_queue);
1da177e4 LT	311
	312	/**
	313	* gnet_stats_copy_app - copy application specific statistics into statistics TLV
	314	* @d: dumping handle
	315	* @st: application specific statistics data
	316	* @len: length of data
	317	*
e793c0f7	318	* Appends the application specific statistics to the top level TLV created by
1da177e4 LT	319	* gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
	320	* handle is in backward compatibility mode.
	321	*
	322	* Returns 0 on success or -1 with the statistic lock released
	323	* if the room in the socket buffer was not sufficient.
	324	*/
	325	int
	326	gnet_stats_copy_app(struct gnet_dump d, void st, int len)
	327	{
	328	if (d->compat_xstats) {
1c4cff0c IG	329	d->xstats = kmemdup(st, len, GFP_ATOMIC);
	330	if (!d->xstats)
	331	goto err_out;
1da177e4 LT	332	d->xstats_len = len;
	333	}
	334
	335	if (d->tail)
9854518e ND	336	return gnet_stats_copy(d, TCA_STATS_APP, st, len,
9854518e ND	337	TCA_STATS_PAD);
1da177e4 LT	338
1da177e4 LT	339	return 0;
1c4cff0c IG	340
1c4cff0c IG	341	err_out:
edb09eb1 ED	342	if (d->lock)
edb09eb1 ED	343	spin_unlock_bh(d->lock);
1c4cff0c	344	d->xstats_len = 0;
1c4cff0c	345	return -1;
1da177e4	346	}
9e34a5b5	347	EXPORT_SYMBOL(gnet_stats_copy_app);
1da177e4 LT	348
	349	/**
	350	* gnet_stats_finish_copy - finish dumping procedure
	351	* @d: dumping handle
	352	*
	353	* Corrects the length of the top level TLV to include all TLVs added
	354	* by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
	355	* if gnet_stats_start_copy_compat() was used and releases the statistics
	356	* lock.
	357	*
	358	* Returns 0 on success or -1 with the statistic lock released
	359	* if the room in the socket buffer was not sufficient.
	360	*/
	361	int
	362	gnet_stats_finish_copy(struct gnet_dump *d)
	363	{
	364	if (d->tail)
1e90474c	365	d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
1da177e4 LT	366
	367	if (d->compat_tc_stats)
	368	if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
9854518e	369	sizeof(d->tc_stats), d->padattr) < 0)
1da177e4 LT	370	return -1;
	371
	372	if (d->compat_xstats && d->xstats) {
	373	if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
9854518e	374	d->xstats_len, d->padattr) < 0)
1da177e4 LT	375	return -1;
	376	}
	377
edb09eb1 ED	378	if (d->lock)
edb09eb1 ED	379	spin_unlock_bh(d->lock);
1c4cff0c IG	380	kfree(d->xstats);
	381	d->xstats = NULL;
	382	d->xstats_len = 0;
1da177e4 LT	383	return 0;
1da177e4 LT	384	}
1da177e4	385	EXPORT_SYMBOL(gnet_stats_finish_copy);