net/core/gen_stats.c - kernel/mindspeed - Git at Google

 /*
  * 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)
 {
 	NLA_PUT(d->skb, type, size, buf);
 	return 0;

 nla_put_failure:
 	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)
 	__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;

 	if (d->tail)
 		return gnet_stats_copy(d, type, NULL, 0);

 	return 0;
 }
 EXPORT_SYMBOL(gnet_stats_start_copy_compat);

 /**
  * 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
  * @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)
 {
 	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
 }
 EXPORT_SYMBOL(gnet_stats_start_copy);

 /**
  * gnet_stats_copy_basic - copy basic statistics into statistic TLV
  * @d: dumping handle
  * @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_packed *b)
 {
 	if (d->compat_tc_stats) {
 		d->tc_stats.bytes = b->bytes;
 		d->tc_stats.packets = b->packets;
 	}

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

 		memset(&sb, 0, sizeof(sb));
 		sb.bytes = b->bytes;
 		sb.packets = b->packets;
 		return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
 	}
 	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_est *r)
 {
 	if (b && !gen_estimator_active(b, r))
 		return 0;

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

 	if (d->tail)
 		return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));

 	return 0;
 }
 EXPORT_SYMBOL(gnet_stats_copy_rate_est);

 /**
  * gnet_stats_copy_queue - copy queue statistics into statistics TLV
  * @d: dumping handle
  * @q: queue statistics
  *
  * Appends the queue 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_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
 {
 	if (d->compat_tc_stats) {
 		d->tc_stats.drops = q->drops;
 		d->tc_stats.qlen = q->qlen;
 		d->tc_stats.backlog = q->backlog;
 		d->tc_stats.overlimits = q->overlimits;
 	}

 	if (d->tail)
 		return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));

 	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 sepecific 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 = st;
 		d->xstats_len = len;
 	}

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

 	return 0;
 }
 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)) < 0)
 			return -1;

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

 	spin_unlock_bh(d->lock);
 	return 0;
 }
 EXPORT_SYMBOL(gnet_stats_finish_copy);
	/*
	* 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)
	{
	NLA_PUT(d->skb, type, size, buf);
	return 0;

	nla_put_failure:
	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)
	__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;

	if (d->tail)
	return gnet_stats_copy(d, type, NULL, 0);

	return 0;
	}
	EXPORT_SYMBOL(gnet_stats_start_copy_compat);

	/**
	* 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
	* @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)
	{
	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
	}
	EXPORT_SYMBOL(gnet_stats_start_copy);

	/**
	* gnet_stats_copy_basic - copy basic statistics into statistic TLV
	* @d: dumping handle
	* @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_packed b)
	{
	if (d->compat_tc_stats) {
	d->tc_stats.bytes = b->bytes;
	d->tc_stats.packets = b->packets;
	}

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

	memset(&sb, 0, sizeof(sb));
	sb.bytes = b->bytes;
	sb.packets = b->packets;
	return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
	}
	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_est *r)
	{
	if (b && !gen_estimator_active(b, r))
	return 0;

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

	if (d->tail)
	return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));

	return 0;
	}
	EXPORT_SYMBOL(gnet_stats_copy_rate_est);

	/**
	* gnet_stats_copy_queue - copy queue statistics into statistics TLV
	* @d: dumping handle
	* @q: queue statistics
	*
	* Appends the queue 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_queue(struct gnet_dump d, struct gnet_stats_queue q)
	{
	if (d->compat_tc_stats) {
	d->tc_stats.drops = q->drops;
	d->tc_stats.qlen = q->qlen;
	d->tc_stats.backlog = q->backlog;
	d->tc_stats.overlimits = q->overlimits;
	}

	if (d->tail)
	return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));

	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 sepecific 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 = st;
	d->xstats_len = len;
	}

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

	return 0;
	}
	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)) < 0)
	return -1;

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

	spin_unlock_bh(d->lock);
	return 0;
	}
	EXPORT_SYMBOL(gnet_stats_finish_copy);