[linux-2.6-block.git] / net / core / gen_stats.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/core/gen_stats.c
 *
 * 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) {
		int ret = gnet_stats_copy(d, type, NULL, 0, padattr);

		/* The initial attribute added in gnet_stats_copy() may be
		 * preceded by a padding attribute, in which case d->tail will
		 * end up pointing at the padding instead of the real attribute.
		 * Fix this so gnet_stats_finish_copy() adjusts the length of
		 * the right attribute.
		 */
		if (ret == 0 && d->tail->nla_type == padattr)
			d->tail = (struct nlattr *)((char *)d->tail +
						    NLA_ALIGN(d->tail->nla_len));
		return ret;
	}

	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, 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);

static 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,
			 int type)
{
	struct gnet_stats_basic_packed bstats = {0};

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

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

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

		memset(&sb, 0, sizeof(sb));
		sb.bytes = bstats.bytes;
		sb.packets = bstats.packets;
		res = gnet_stats_copy(d, type, &sb, sizeof(sb), TCA_STATS_PAD);
		if (res < 0 || sb.packets == bstats.packets)
			return res;
		/* emit 64bit stats only if needed */
		return gnet_stats_copy(d, TCA_STATS_PKT64, &bstats.packets,
				       sizeof(bstats.packets), TCA_STATS_PAD);
	}
	return 0;
}

/**
 * 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)
{
	return ___gnet_stats_copy_basic(running, d, cpu, b,
					TCA_STATS_BASIC);
}
EXPORT_SYMBOL(gnet_stats_copy_basic);

/**
 * gnet_stats_copy_basic_hw - copy basic hw 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_hw(const seqcount_t *running,
			 struct gnet_dump *d,
			 struct gnet_stats_basic_cpu __percpu *cpu,
			 struct gnet_stats_basic_packed *b)
{
	return ___gnet_stats_copy_basic(running, d, cpu, b,
					TCA_STATS_BASIC_HW);
}
EXPORT_SYMBOL(gnet_stats_copy_basic_hw);

/**
 * 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;
	}
}

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;
}
EXPORT_SYMBOL(__gnet_stats_copy_queue);

/**
 * 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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* net/core/gen_stats.c
	4	*
1da177e4 LT	5	* Authors: Thomas Graf <tgraf@suug.ch>
	6	* Jamal Hadi Salim
	7	* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	8	*
	9	* See Documentation/networking/gen_stats.txt
	10	*/
	11
	12	#include <linux/types.h>
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/socket.h>
	17	#include <linux/rtnetlink.h>
	18	#include <linux/gen_stats.h>
1e90474c	19	#include <net/netlink.h>
1da177e4 LT	20	#include <net/gen_stats.h>
	21
	22
	23	static inline int
9854518e	24	gnet_stats_copy(struct gnet_dump d, int type, void buf, int size, int padattr)
1da177e4	25	{
9854518e	26	if (nla_put_64bit(d->skb, type, size, buf, padattr))
14ad6647	27	goto nla_put_failure;
1da177e4 LT	28	return 0;
1da177e4 LT	29
1e90474c	30	nla_put_failure:
edb09eb1 ED	31	if (d->lock)
edb09eb1 ED	32	spin_unlock_bh(d->lock);
1c4cff0c IG	33	kfree(d->xstats);
	34	d->xstats = NULL;
	35	d->xstats_len = 0;
1da177e4 LT	36	return -1;
	37	}
	38
	39	/**
	40	* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
	41	* @skb: socket buffer to put statistics TLVs into
	42	* @type: TLV type for top level statistic TLV
	43	* @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
	44	* @xstats_type: TLV type for backward compatibility xstats TLV
	45	* @lock: statistics lock
	46	* @d: dumping handle
e0d194ad	47	* @padattr: padding attribute
1da177e4 LT	48	*
	49	* Initializes the dumping handle, grabs the statistic lock and appends
	50	* an empty TLV header to the socket buffer for use a container for all
	51	* other statistic TLVS.
	52	*
	53	* The dumping handle is marked to be in backward compatibility mode telling
	54	* all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
	55	*
	56	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	57	*/
	58	int
	59	gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
9854518e ND	60	int xstats_type, spinlock_t *lock,
9854518e ND	61	struct gnet_dump *d, int padattr)
9a429c49	62	__acquires(lock)
1da177e4 LT	63	{
1da177e4 LT	64	memset(d, 0, sizeof(*d));
4ec93edb	65
1da177e4	66	if (type)
1e90474c	67	d->tail = (struct nlattr *)skb_tail_pointer(skb);
1da177e4 LT	68	d->skb = skb;
	69	d->compat_tc_stats = tc_stats_type;
	70	d->compat_xstats = xstats_type;
9854518e	71	d->padattr = padattr;
edb09eb1 ED	72	if (lock) {
	73	d->lock = lock;
	74	spin_lock_bh(lock);
	75	}
d5a672ac THJ	76	if (d->tail) {
	77	int ret = gnet_stats_copy(d, type, NULL, 0, padattr);
	78
	79	/* The initial attribute added in gnet_stats_copy() may be
	80	* preceded by a padding attribute, in which case d->tail will
	81	* end up pointing at the padding instead of the real attribute.
	82	* Fix this so gnet_stats_finish_copy() adjusts the length of
	83	* the right attribute.
	84	*/
	85	if (ret == 0 && d->tail->nla_type == padattr)
	86	d->tail = (struct nlattr )((char )d->tail +
	87	NLA_ALIGN(d->tail->nla_len));
	88	return ret;
	89	}
1da177e4 LT	90
	91	return 0;
	92	}
9e34a5b5	93	EXPORT_SYMBOL(gnet_stats_start_copy_compat);
1da177e4 LT	94
1da177e4 LT	95	/**
9854518e	96	* gnet_stats_start_copy - start dumping procedure in compatibility mode
1da177e4 LT	97	* @skb: socket buffer to put statistics TLVs into
	98	* @type: TLV type for top level statistic TLV
	99	* @lock: statistics lock
	100	* @d: dumping handle
e0d194ad	101	* @padattr: padding attribute
1da177e4 LT	102	*
	103	* Initializes the dumping handle, grabs the statistic lock and appends
	104	* an empty TLV header to the socket buffer for use a container for all
	105	* other statistic TLVS.
	106	*
	107	* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
	108	*/
	109	int
	110	gnet_stats_start_copy(struct sk_buff skb, int type, spinlock_t lock,
9854518e	111	struct gnet_dump *d, int padattr)
1da177e4	112	{
9854518e	113	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
1da177e4	114	}
9e34a5b5	115	EXPORT_SYMBOL(gnet_stats_start_copy);
1da177e4	116
22e0f8b9 JF	117	static void
	118	__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
	119	struct gnet_stats_basic_cpu __percpu *cpu)
	120	{
	121	int i;
	122
	123	for_each_possible_cpu(i) {
	124	struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
	125	unsigned int start;
d0083d98	126	u64 bytes, packets;
22e0f8b9 JF	127
	128	do {
	129	start = u64_stats_fetch_begin_irq(&bcpu->syncp);
	130	bytes = bcpu->bstats.bytes;
	131	packets = bcpu->bstats.packets;
	132	} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
	133
02c0fc1b WC	134	bstats->bytes += bytes;
02c0fc1b WC	135	bstats->packets += packets;
22e0f8b9 JF	136	}
	137	}
	138
	139	void
edb09eb1 ED	140	__gnet_stats_copy_basic(const seqcount_t *running,
edb09eb1 ED	141	struct gnet_stats_basic_packed *bstats,
22e0f8b9 JF	142	struct gnet_stats_basic_cpu __percpu *cpu,
	143	struct gnet_stats_basic_packed *b)
	144	{
edb09eb1 ED	145	unsigned int seq;
edb09eb1 ED	146
22e0f8b9 JF	147	if (cpu) {
22e0f8b9 JF	148	__gnet_stats_copy_basic_cpu(bstats, cpu);
edb09eb1 ED	149	return;
	150	}
	151	do {
	152	if (running)
	153	seq = read_seqcount_begin(running);
22e0f8b9 JF	154	bstats->bytes = b->bytes;
22e0f8b9 JF	155	bstats->packets = b->packets;
edb09eb1	156	} while (running && read_seqcount_retry(running, seq));
22e0f8b9 JF	157	}
	158	EXPORT_SYMBOL(__gnet_stats_copy_basic);
	159
5d70a670	160	static int
5e111210 EC	161	___gnet_stats_copy_basic(const seqcount_t *running,
	162	struct gnet_dump *d,
	163	struct gnet_stats_basic_cpu __percpu *cpu,
	164	struct gnet_stats_basic_packed *b,
	165	int type)
1da177e4	166	{
22e0f8b9 JF	167	struct gnet_stats_basic_packed bstats = {0};
22e0f8b9 JF	168
edb09eb1	169	__gnet_stats_copy_basic(running, &bstats, cpu, b);
22e0f8b9	170
5e111210	171	if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
22e0f8b9 JF	172	d->tc_stats.bytes = bstats.bytes;
22e0f8b9 JF	173	d->tc_stats.packets = bstats.packets;
1da177e4 LT	174	}
1da177e4 LT	175
c1a8f1f1 ED	176	if (d->tail) {
c1a8f1f1 ED	177	struct gnet_stats_basic sb;
b33e699f	178	int res;
1da177e4	179
c1a8f1f1	180	memset(&sb, 0, sizeof(sb));
22e0f8b9 JF	181	sb.bytes = bstats.bytes;
22e0f8b9 JF	182	sb.packets = bstats.packets;
b33e699f ED	183	res = gnet_stats_copy(d, type, &sb, sizeof(sb), TCA_STATS_PAD);
	184	if (res < 0 \|\| sb.packets == bstats.packets)
	185	return res;
	186	/* emit 64bit stats only if needed */
	187	return gnet_stats_copy(d, TCA_STATS_PKT64, &bstats.packets,
	188	sizeof(bstats.packets), TCA_STATS_PAD);
c1a8f1f1	189	}
1da177e4 LT	190	return 0;
1da177e4 LT	191	}
5e111210 EC	192
	193	/**
	194	* gnet_stats_copy_basic - copy basic statistics into statistic TLV
	195	* @running: seqcount_t pointer
	196	* @d: dumping handle
	197	* @cpu: copy statistic per cpu
	198	* @b: basic statistics
	199	*
	200	* Appends the basic statistics to the top level TLV created by
	201	* gnet_stats_start_copy().
	202	*
	203	* Returns 0 on success or -1 with the statistic lock released
	204	* if the room in the socket buffer was not sufficient.
	205	*/
	206	int
	207	gnet_stats_copy_basic(const seqcount_t *running,
	208	struct gnet_dump *d,
	209	struct gnet_stats_basic_cpu __percpu *cpu,
	210	struct gnet_stats_basic_packed *b)
	211	{
	212	return ___gnet_stats_copy_basic(running, d, cpu, b,
	213	TCA_STATS_BASIC);
	214	}
9e34a5b5	215	EXPORT_SYMBOL(gnet_stats_copy_basic);
1da177e4	216
5e111210 EC	217	/**
	218	* gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
	219	* @running: seqcount_t pointer
	220	* @d: dumping handle
	221	* @cpu: copy statistic per cpu
	222	* @b: basic statistics
	223	*
	224	* Appends the basic statistics to the top level TLV created by
	225	* gnet_stats_start_copy().
	226	*
	227	* Returns 0 on success or -1 with the statistic lock released
	228	* if the room in the socket buffer was not sufficient.
	229	*/
	230	int
	231	gnet_stats_copy_basic_hw(const seqcount_t *running,
	232	struct gnet_dump *d,
	233	struct gnet_stats_basic_cpu __percpu *cpu,
	234	struct gnet_stats_basic_packed *b)
	235	{
	236	return ___gnet_stats_copy_basic(running, d, cpu, b,
	237	TCA_STATS_BASIC_HW);
	238	}
	239	EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
	240
1da177e4 LT	241	/**
	242	* gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
	243	* @d: dumping handle
1c0d32fd	244	* @rate_est: rate estimator
1da177e4 LT	245	*
	246	* Appends the rate estimator statistics to the top level TLV created by
	247	* gnet_stats_start_copy().
	248	*
	249	* Returns 0 on success or -1 with the statistic lock released
	250	* if the room in the socket buffer was not sufficient.
	251	*/
	252	int
d250a5f9	253	gnet_stats_copy_rate_est(struct gnet_dump *d,
1c0d32fd	254	struct net_rate_estimator __rcu **rate_est)
1da177e4	255	{
1c0d32fd	256	struct gnet_stats_rate_est64 sample;
45203a3b ED	257	struct gnet_stats_rate_est est;
	258	int res;
	259
1c0d32fd	260	if (!gen_estimator_read(rate_est, &sample))
d250a5f9	261	return 0;
1c0d32fd	262	est.bps = min_t(u64, UINT_MAX, sample.bps);
45203a3b	263	/* we have some time before reaching 2^32 packets per second */
1c0d32fd	264	est.pps = sample.pps;
45203a3b	265
1da177e4	266	if (d->compat_tc_stats) {
45203a3b ED	267	d->tc_stats.bps = est.bps;
45203a3b ED	268	d->tc_stats.pps = est.pps;
1da177e4 LT	269	}
1da177e4 LT	270
45203a3b	271	if (d->tail) {
9854518e ND	272	res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
9854518e ND	273	TCA_STATS_PAD);
1c0d32fd	274	if (res < 0 \|\| est.bps == sample.bps)
45203a3b ED	275	return res;
45203a3b ED	276	/* emit 64bit stats only if needed */
1c0d32fd ED	277	return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
1c0d32fd ED	278	sizeof(sample), TCA_STATS_PAD);
45203a3b	279	}
1da177e4 LT	280
	281	return 0;
	282	}
9e34a5b5	283	EXPORT_SYMBOL(gnet_stats_copy_rate_est);
1da177e4	284
b0ab6f92 JF	285	static void
	286	__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
	287	const struct gnet_stats_queue __percpu *q)
	288	{
	289	int i;
	290
	291	for_each_possible_cpu(i) {
	292	const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
	293
73eb628d	294	qstats->qlen = 0;
b0ab6f92 JF	295	qstats->backlog += qcpu->backlog;
	296	qstats->drops += qcpu->drops;
	297	qstats->requeues += qcpu->requeues;
	298	qstats->overlimits += qcpu->overlimits;
	299	}
	300	}
	301
b01ac095 JF	302	void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
	303	const struct gnet_stats_queue __percpu *cpu,
	304	const struct gnet_stats_queue *q,
	305	__u32 qlen)
b0ab6f92 JF	306	{
	307	if (cpu) {
	308	__gnet_stats_copy_queue_cpu(qstats, cpu);
	309	} else {
73eb628d	310	qstats->qlen = q->qlen;
b0ab6f92 JF	311	qstats->backlog = q->backlog;
	312	qstats->drops = q->drops;
	313	qstats->requeues = q->requeues;
	314	qstats->overlimits = q->overlimits;
	315	}
	316
	317	qstats->qlen = qlen;
	318	}
b01ac095	319	EXPORT_SYMBOL(__gnet_stats_copy_queue);
b0ab6f92	320
1da177e4 LT	321	/**
	322	* gnet_stats_copy_queue - copy queue statistics into statistics TLV
	323	* @d: dumping handle
b0ab6f92	324	* @cpu_q: per cpu queue statistics
1da177e4	325	* @q: queue statistics
64015853	326	* @qlen: queue length statistics
1da177e4 LT	327	*
1da177e4 LT	328	* Appends the queue statistics to the top level TLV created by
b0ab6f92 JF	329	* gnet_stats_start_copy(). Using per cpu queue statistics if
b0ab6f92 JF	330	* they are available.
1da177e4 LT	331	*
	332	* Returns 0 on success or -1 with the statistic lock released
	333	* if the room in the socket buffer was not sufficient.
	334	*/
	335	int
64015853	336	gnet_stats_copy_queue(struct gnet_dump *d,
b0ab6f92	337	struct gnet_stats_queue __percpu *cpu_q,
64015853	338	struct gnet_stats_queue *q, __u32 qlen)
1da177e4	339	{
b0ab6f92 JF	340	struct gnet_stats_queue qstats = {0};
	341
	342	__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
64015853	343
1da177e4	344	if (d->compat_tc_stats) {
b0ab6f92 JF	345	d->tc_stats.drops = qstats.drops;
	346	d->tc_stats.qlen = qstats.qlen;
	347	d->tc_stats.backlog = qstats.backlog;
	348	d->tc_stats.overlimits = qstats.overlimits;
1da177e4 LT	349	}
	350
	351	if (d->tail)
b0ab6f92	352	return gnet_stats_copy(d, TCA_STATS_QUEUE,
9854518e ND	353	&qstats, sizeof(qstats),
9854518e ND	354	TCA_STATS_PAD);
1da177e4 LT	355
	356	return 0;
	357	}
9e34a5b5	358	EXPORT_SYMBOL(gnet_stats_copy_queue);
1da177e4 LT	359
	360	/**
	361	* gnet_stats_copy_app - copy application specific statistics into statistics TLV
	362	* @d: dumping handle
	363	* @st: application specific statistics data
	364	* @len: length of data
	365	*
e793c0f7	366	* Appends the application specific statistics to the top level TLV created by
1da177e4 LT	367	* gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
	368	* handle is in backward compatibility mode.
	369	*
	370	* Returns 0 on success or -1 with the statistic lock released
	371	* if the room in the socket buffer was not sufficient.
	372	*/
	373	int
	374	gnet_stats_copy_app(struct gnet_dump d, void st, int len)
	375	{
	376	if (d->compat_xstats) {
1c4cff0c IG	377	d->xstats = kmemdup(st, len, GFP_ATOMIC);
	378	if (!d->xstats)
	379	goto err_out;
1da177e4 LT	380	d->xstats_len = len;
	381	}
	382
	383	if (d->tail)
9854518e ND	384	return gnet_stats_copy(d, TCA_STATS_APP, st, len,
9854518e ND	385	TCA_STATS_PAD);
1da177e4 LT	386
1da177e4 LT	387	return 0;
1c4cff0c IG	388
1c4cff0c IG	389	err_out:
edb09eb1 ED	390	if (d->lock)
edb09eb1 ED	391	spin_unlock_bh(d->lock);
1c4cff0c	392	d->xstats_len = 0;
1c4cff0c	393	return -1;
1da177e4	394	}
9e34a5b5	395	EXPORT_SYMBOL(gnet_stats_copy_app);
1da177e4 LT	396
	397	/**
	398	* gnet_stats_finish_copy - finish dumping procedure
	399	* @d: dumping handle
	400	*
	401	* Corrects the length of the top level TLV to include all TLVs added
	402	* by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
	403	* if gnet_stats_start_copy_compat() was used and releases the statistics
	404	* lock.
	405	*
	406	* Returns 0 on success or -1 with the statistic lock released
	407	* if the room in the socket buffer was not sufficient.
	408	*/
	409	int
	410	gnet_stats_finish_copy(struct gnet_dump *d)
	411	{
	412	if (d->tail)
1e90474c	413	d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
1da177e4 LT	414
	415	if (d->compat_tc_stats)
	416	if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
9854518e	417	sizeof(d->tc_stats), d->padattr) < 0)
1da177e4 LT	418	return -1;
	419
	420	if (d->compat_xstats && d->xstats) {
	421	if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
9854518e	422	d->xstats_len, d->padattr) < 0)
1da177e4 LT	423	return -1;
	424	}
	425
edb09eb1 ED	426	if (d->lock)
edb09eb1 ED	427	spin_unlock_bh(d->lock);
1c4cff0c IG	428	kfree(d->xstats);
	429	d->xstats = NULL;
	430	d->xstats_len = 0;
1da177e4 LT	431	return 0;
1da177e4 LT	432	}
1da177e4	433	EXPORT_SYMBOL(gnet_stats_finish_copy);