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