[deliverable/linux.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:
	kfree(d->xstats);
	d->xstats = NULL;
	d->xstats_len = 0;
	spin_unlock_bh(d->lock);
	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));

	spin_lock_bh(lock);
	d->lock = lock;
	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 (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(struct gnet_stats_basic_packed *bstats,
			struct gnet_stats_basic_cpu __percpu *cpu,
			struct gnet_stats_basic_packed *b)
{
	if (cpu) {
		__gnet_stats_copy_basic_cpu(bstats, cpu);
	} else {
		bstats->bytes = b->bytes;
		bstats->packets = b->packets;
	}
}
EXPORT_SYMBOL(__gnet_stats_copy_basic);

/**
 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
 * @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(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(&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
 * @b: basic statistics
 * @r: rate estimator statistics
 *
 * 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,
			 const struct gnet_stats_basic_packed *b,
			 struct gnet_stats_rate_est64 *r)
{
	struct gnet_stats_rate_est est;
	int res;

	if (b && !gen_estimator_active(b, r))
		return 0;

	est.bps = min_t(u64, UINT_MAX, r->bps);
	/* we have some time before reaching 2^32 packets per second */
	est.pps = r->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 == r->bps)
			return res;
		/* emit 64bit stats only if needed */
		return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r),
				       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:
	d->xstats_len = 0;
	spin_unlock_bh(d->lock);
	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;
	}

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