[deliverable/linux.git] / net / can / proc.c

/*
 * proc.c - procfs support for Protocol family CAN core module
 *
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/if_arp.h>
#include <linux/can/core.h>

#include "af_can.h"

/*
 * proc filenames for the PF_CAN core
 */

#define CAN_PROC_VERSION     "version"
#define CAN_PROC_STATS       "stats"
#define CAN_PROC_RESET_STATS "reset_stats"
#define CAN_PROC_RCVLIST_ALL "rcvlist_all"
#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
#define CAN_PROC_RCVLIST_INV "rcvlist_inv"
#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
#define CAN_PROC_RCVLIST_ERR "rcvlist_err"

static struct proc_dir_entry *can_dir;
static struct proc_dir_entry *pde_version;
static struct proc_dir_entry *pde_stats;
static struct proc_dir_entry *pde_reset_stats;
static struct proc_dir_entry *pde_rcvlist_all;
static struct proc_dir_entry *pde_rcvlist_fil;
static struct proc_dir_entry *pde_rcvlist_inv;
static struct proc_dir_entry *pde_rcvlist_sff;
static struct proc_dir_entry *pde_rcvlist_eff;
static struct proc_dir_entry *pde_rcvlist_err;

static int user_reset;

static const char rx_list_name[][8] = {
	[RX_ERR] = "rx_err",
	[RX_ALL] = "rx_all",
	[RX_FIL] = "rx_fil",
	[RX_INV] = "rx_inv",
};

/*
 * af_can statistics stuff
 */

static void can_init_stats(void)
{
	/*
	 * This memset function is called from a timer context (when
	 * can_stattimer is active which is the default) OR in a process
	 * context (reading the proc_fs when can_stattimer is disabled).
	 */
	memset(&can_stats, 0, sizeof(can_stats));
	can_stats.jiffies_init = jiffies;

	can_pstats.stats_reset++;

	if (user_reset) {
		user_reset = 0;
		can_pstats.user_reset++;
	}
}

static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
			       unsigned long count)
{
	unsigned long rate;

	if (oldjif == newjif)
		return 0;

	/* see can_stat_update() - this should NEVER happen! */
	if (count > (ULONG_MAX / HZ)) {
		printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
		       count);
		return 99999999;
	}

	rate = (count * HZ) / (newjif - oldjif);

	return rate;
}

void can_stat_update(unsigned long data)
{
	unsigned long j = jiffies; /* snapshot */

	/* restart counting in timer context on user request */
	if (user_reset)
		can_init_stats();

	/* restart counting on jiffies overflow */
	if (j < can_stats.jiffies_init)
		can_init_stats();

	/* prevent overflow in calc_rate() */
	if (can_stats.rx_frames > (ULONG_MAX / HZ))
		can_init_stats();

	/* prevent overflow in calc_rate() */
	if (can_stats.tx_frames > (ULONG_MAX / HZ))
		can_init_stats();

	/* matches overflow - very improbable */
	if (can_stats.matches > (ULONG_MAX / 100))
		can_init_stats();

	/* calc total values */
	if (can_stats.rx_frames)
		can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
			can_stats.rx_frames;

	can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
					    can_stats.tx_frames);
	can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
					    can_stats.rx_frames);

	/* calc current values */
	if (can_stats.rx_frames_delta)
		can_stats.current_rx_match_ratio =
			(can_stats.matches_delta * 100) /
			can_stats.rx_frames_delta;

	can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
	can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);

	/* check / update maximum values */
	if (can_stats.max_tx_rate < can_stats.current_tx_rate)
		can_stats.max_tx_rate = can_stats.current_tx_rate;

	if (can_stats.max_rx_rate < can_stats.current_rx_rate)
		can_stats.max_rx_rate = can_stats.current_rx_rate;

	if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
		can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;

	/* clear values for 'current rate' calculation */
	can_stats.tx_frames_delta = 0;
	can_stats.rx_frames_delta = 0;
	can_stats.matches_delta   = 0;

	/* restart timer (one second) */
	mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
}

/*
 * proc read functions
 */

static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
			      struct net_device *dev)
{
	struct receiver *r;

	hlist_for_each_entry_rcu(r, rx_list, list) {
		char *fmt = (r->can_id & CAN_EFF_FLAG)?
			"   %-5s  %08x  %08x  %pK  %pK  %8ld  %s\n" :
			"   %-5s     %03x    %08x  %pK  %pK  %8ld  %s\n";

		seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
				r->func, r->data, r->matches, r->ident);
	}
}

static void can_print_recv_banner(struct seq_file *m)
{
	/*
	 *                  can1.  00000000  00000000  00000000
	 *                 .......          0  tp20
	 */
	seq_puts(m, "  device   can_id   can_mask  function"
			"  userdata   matches  ident\n");
}

static int can_stats_proc_show(struct seq_file *m, void *v)
{
	seq_putc(m, '\n');
	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
	seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);

	seq_putc(m, '\n');

	if (can_stattimer.function == can_stat_update) {
		seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
				can_stats.total_rx_match_ratio);

		seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
				can_stats.total_tx_rate);
		seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
				can_stats.total_rx_rate);

		seq_putc(m, '\n');

		seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
				can_stats.current_rx_match_ratio);

		seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
				can_stats.current_tx_rate);
		seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
				can_stats.current_rx_rate);

		seq_putc(m, '\n');

		seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
				can_stats.max_rx_match_ratio);

		seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
				can_stats.max_tx_rate);
		seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
				can_stats.max_rx_rate);

		seq_putc(m, '\n');
	}

	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
			can_pstats.rcv_entries);
	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
			can_pstats.rcv_entries_max);

	if (can_pstats.stats_reset)
		seq_printf(m, "\n %8ld statistic resets (STR)\n",
				can_pstats.stats_reset);

	if (can_pstats.user_reset)
		seq_printf(m, " %8ld user statistic resets (USTR)\n",
				can_pstats.user_reset);

	seq_putc(m, '\n');
	return 0;
}

static int can_stats_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_stats_proc_show, NULL);
}

static const struct file_operations can_stats_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int can_reset_stats_proc_show(struct seq_file *m, void *v)
{
	user_reset = 1;

	if (can_stattimer.function == can_stat_update) {
		seq_printf(m, "Scheduled statistic reset #%ld.\n",
				can_pstats.stats_reset + 1);

	} else {
		if (can_stats.jiffies_init != jiffies)
			can_init_stats();

		seq_printf(m, "Performed statistic reset #%ld.\n",
				can_pstats.stats_reset);
	}
	return 0;
}

static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_reset_stats_proc_show, NULL);
}

static const struct file_operations can_reset_stats_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_reset_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int can_version_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%s\n", CAN_VERSION_STRING);
	return 0;
}

static int can_version_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_version_proc_show, NULL);
}

static const struct file_operations can_version_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_version_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
					     struct net_device *dev,
					     struct dev_rcv_lists *d)
{
	if (!hlist_empty(&d->rx[idx])) {
		can_print_recv_banner(m);
		can_print_rcvlist(m, &d->rx[idx], dev);
	} else
		seq_printf(m, "  (%s: no entry)\n", DNAME(dev));

}

static int can_rcvlist_proc_show(struct seq_file *m, void *v)
{
	/* double cast to prevent GCC warning */
	int idx = (int)(long)m->private;
	struct net_device *dev;
	struct dev_rcv_lists *d;

	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);

	rcu_read_lock();

	/* receive list for 'all' CAN devices (dev == NULL) */
	d = &can_rx_alldev_list;
	can_rcvlist_proc_show_one(m, idx, NULL, d);

	/* receive list for registered CAN devices */
	for_each_netdev_rcu(&init_net, dev) {
		if (dev->type == ARPHRD_CAN && dev->ml_priv)
			can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
	}

	rcu_read_unlock();

	seq_putc(m, '\n');
	return 0;
}

static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode));
}

static const struct file_operations can_rcvlist_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_rcvlist_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static inline void can_rcvlist_proc_show_array(struct seq_file *m,
					       struct net_device *dev,
					       struct hlist_head *rcv_array,
					       unsigned int rcv_array_sz)
{
	unsigned int i;
	int all_empty = 1;

	/* check whether at least one list is non-empty */
	for (i = 0; i < rcv_array_sz; i++)
		if (!hlist_empty(&rcv_array[i])) {
			all_empty = 0;
			break;
		}

	if (!all_empty) {
		can_print_recv_banner(m);
		for (i = 0; i < rcv_array_sz; i++) {
			if (!hlist_empty(&rcv_array[i]))
				can_print_rcvlist(m, &rcv_array[i], dev);
		}
	} else
		seq_printf(m, "  (%s: no entry)\n", DNAME(dev));
}

static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
{
	struct net_device *dev;
	struct dev_rcv_lists *d;

	/* RX_SFF */
	seq_puts(m, "\nreceive list 'rx_sff':\n");

	rcu_read_lock();

	/* sff receive list for 'all' CAN devices (dev == NULL) */
	d = &can_rx_alldev_list;
	can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));

	/* sff receive list for registered CAN devices */
	for_each_netdev_rcu(&init_net, dev) {
		if (dev->type == ARPHRD_CAN && dev->ml_priv) {
			d = dev->ml_priv;
			can_rcvlist_proc_show_array(m, dev, d->rx_sff,
						    ARRAY_SIZE(d->rx_sff));
		}
	}

	rcu_read_unlock();

	seq_putc(m, '\n');
	return 0;
}

static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_rcvlist_sff_proc_show, NULL);
}

static const struct file_operations can_rcvlist_sff_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_rcvlist_sff_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};


static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
{
	struct net_device *dev;
	struct dev_rcv_lists *d;

	/* RX_EFF */
	seq_puts(m, "\nreceive list 'rx_eff':\n");

	rcu_read_lock();

	/* eff receive list for 'all' CAN devices (dev == NULL) */
	d = &can_rx_alldev_list;
	can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));

	/* eff receive list for registered CAN devices */
	for_each_netdev_rcu(&init_net, dev) {
		if (dev->type == ARPHRD_CAN && dev->ml_priv) {
			d = dev->ml_priv;
			can_rcvlist_proc_show_array(m, dev, d->rx_eff,
						    ARRAY_SIZE(d->rx_eff));
		}
	}

	rcu_read_unlock();

	seq_putc(m, '\n');
	return 0;
}

static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, can_rcvlist_eff_proc_show, NULL);
}

static const struct file_operations can_rcvlist_eff_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= can_rcvlist_eff_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

/*
 * proc utility functions
 */

static void can_remove_proc_readentry(const char *name)
{
	if (can_dir)
		remove_proc_entry(name, can_dir);
}

/*
 * can_init_proc - create main CAN proc directory and procfs entries
 */
void can_init_proc(void)
{
	/* create /proc/net/can directory */
	can_dir = proc_mkdir("can", init_net.proc_net);

	if (!can_dir) {
		printk(KERN_INFO "can: failed to create /proc/net/can . "
		       "CONFIG_PROC_FS missing?\n");
		return;
	}

	/* own procfs entries from the AF_CAN core */
	pde_version     = proc_create(CAN_PROC_VERSION, 0644, can_dir,
				      &can_version_proc_fops);
	pde_stats       = proc_create(CAN_PROC_STATS, 0644, can_dir,
				      &can_stats_proc_fops);
	pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
				      &can_reset_stats_proc_fops);
	pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
					   &can_rcvlist_proc_fops, (void *)RX_ERR);
	pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
					   &can_rcvlist_proc_fops, (void *)RX_ALL);
	pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
					   &can_rcvlist_proc_fops, (void *)RX_FIL);
	pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
					   &can_rcvlist_proc_fops, (void *)RX_INV);
	pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
				      &can_rcvlist_eff_proc_fops);
	pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
				      &can_rcvlist_sff_proc_fops);
}

/*
 * can_remove_proc - remove procfs entries and main CAN proc directory
 */
void can_remove_proc(void)
{
	if (pde_version)
		can_remove_proc_readentry(CAN_PROC_VERSION);

	if (pde_stats)
		can_remove_proc_readentry(CAN_PROC_STATS);

	if (pde_reset_stats)
		can_remove_proc_readentry(CAN_PROC_RESET_STATS);

	if (pde_rcvlist_err)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);

	if (pde_rcvlist_all)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);

	if (pde_rcvlist_fil)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);

	if (pde_rcvlist_inv)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);

	if (pde_rcvlist_eff)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);

	if (pde_rcvlist_sff)
		can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);

	if (can_dir)
		remove_proc_entry("can", init_net.proc_net);
}
Commit	Line	Data
0d66548a OH	1	/*
	2	* proc.c - procfs support for Protocol family CAN core module
	3	*
	4	* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of Volkswagen nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* Alternatively, provided that this notice is retained in full, this
	20	* software may be distributed under the terms of the GNU General
	21	* Public License ("GPL") version 2, in which case the provisions of the
	22	* GPL apply INSTEAD OF those given above.
	23	*
	24	* The provided data structures and external interfaces from this code
	25	* are not restricted to be used by modules with a GPL compatible license.
	26	*
	27	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	28	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	29	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	30	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	31	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	32	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	33	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	34	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	35	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	36	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	37	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
	38	* DAMAGE.
	39	*
0d66548a OH	40	*/
	41
	42	#include <linux/module.h>
	43	#include <linux/proc_fs.h>
	44	#include <linux/list.h>
	45	#include <linux/rcupdate.h>
20dd3850	46	#include <linux/if_arp.h>
0d66548a OH	47	#include <linux/can/core.h>
	48
	49	#include "af_can.h"
	50
	51	/*
	52	* proc filenames for the PF_CAN core
	53	*/
	54
	55	#define CAN_PROC_VERSION "version"
	56	#define CAN_PROC_STATS "stats"
	57	#define CAN_PROC_RESET_STATS "reset_stats"
	58	#define CAN_PROC_RCVLIST_ALL "rcvlist_all"
	59	#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
	60	#define CAN_PROC_RCVLIST_INV "rcvlist_inv"
	61	#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
	62	#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
	63	#define CAN_PROC_RCVLIST_ERR "rcvlist_err"
	64
	65	static struct proc_dir_entry *can_dir;
	66	static struct proc_dir_entry *pde_version;
	67	static struct proc_dir_entry *pde_stats;
	68	static struct proc_dir_entry *pde_reset_stats;
	69	static struct proc_dir_entry *pde_rcvlist_all;
	70	static struct proc_dir_entry *pde_rcvlist_fil;
	71	static struct proc_dir_entry *pde_rcvlist_inv;
	72	static struct proc_dir_entry *pde_rcvlist_sff;
	73	static struct proc_dir_entry *pde_rcvlist_eff;
	74	static struct proc_dir_entry *pde_rcvlist_err;
	75
	76	static int user_reset;
	77
	78	static const char rx_list_name[][8] = {
	79	[RX_ERR] = "rx_err",
	80	[RX_ALL] = "rx_all",
	81	[RX_FIL] = "rx_fil",
	82	[RX_INV] = "rx_inv",
0d66548a OH	83	};
	84
	85	/*
	86	* af_can statistics stuff
	87	*/
	88
	89	static void can_init_stats(void)
	90	{
	91	/*
	92	* This memset function is called from a timer context (when
	93	* can_stattimer is active which is the default) OR in a process
	94	* context (reading the proc_fs when can_stattimer is disabled).
	95	*/
	96	memset(&can_stats, 0, sizeof(can_stats));
	97	can_stats.jiffies_init = jiffies;
	98
	99	can_pstats.stats_reset++;
	100
	101	if (user_reset) {
	102	user_reset = 0;
	103	can_pstats.user_reset++;
	104	}
	105	}
	106
	107	static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
	108	unsigned long count)
	109	{
	110	unsigned long rate;
	111
	112	if (oldjif == newjif)
	113	return 0;
	114
	115	/* see can_stat_update() - this should NEVER happen! */
	116	if (count > (ULONG_MAX / HZ)) {
	117	printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
	118	count);
	119	return 99999999;
	120	}
	121
	122	rate = (count * HZ) / (newjif - oldjif);
	123
	124	return rate;
	125	}
	126
	127	void can_stat_update(unsigned long data)
	128	{
	129	unsigned long j = jiffies; /* snapshot */
	130
	131	/* restart counting in timer context on user request */
	132	if (user_reset)
	133	can_init_stats();
	134
	135	/* restart counting on jiffies overflow */
	136	if (j < can_stats.jiffies_init)
	137	can_init_stats();
	138
	139	/* prevent overflow in calc_rate() */
	140	if (can_stats.rx_frames > (ULONG_MAX / HZ))
	141	can_init_stats();
	142
	143	/* prevent overflow in calc_rate() */
	144	if (can_stats.tx_frames > (ULONG_MAX / HZ))
	145	can_init_stats();
	146
147	/* matches overflow - very improbable */
148	if (can_stats.matches > (ULONG_MAX / 100))
149	can_init_stats();
150
151	/* calc total values */
152	if (can_stats.rx_frames)
153	can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
154	can_stats.rx_frames;
155
156	can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
157	can_stats.tx_frames);
158	can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
159	can_stats.rx_frames);
160
161	/* calc current values */
162	if (can_stats.rx_frames_delta)
163	can_stats.current_rx_match_ratio =
164	(can_stats.matches_delta * 100) /
165	can_stats.rx_frames_delta;
166
167	can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
168	can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
169
170	/* check / update maximum values */
171	if (can_stats.max_tx_rate < can_stats.current_tx_rate)
172	can_stats.max_tx_rate = can_stats.current_tx_rate;
173
174	if (can_stats.max_rx_rate < can_stats.current_rx_rate)
175	can_stats.max_rx_rate = can_stats.current_rx_rate;
176
177	if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
178	can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
179
180	/* clear values for 'current rate' calculation */
181	can_stats.tx_frames_delta = 0;
182	can_stats.rx_frames_delta = 0;
183	can_stats.matches_delta = 0;
184
185	/* restart timer (one second) */
186	mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
187	}
188
189	/*
190	* proc read functions
0d66548a OH	191	*/
0d66548a OH	192
ea00b8e2 AD	193	static void can_print_rcvlist(struct seq_file m, struct hlist_head rx_list,
ea00b8e2 AD	194	struct net_device *dev)
0d66548a OH	195	{
0d66548a OH	196	struct receiver *r;
0d66548a	197
b67bfe0d	198	hlist_for_each_entry_rcu(r, rx_list, list) {
0d66548a	199	char *fmt = (r->can_id & CAN_EFF_FLAG)?
12e6c419 OH	200	" %-5s %08x %08x %pK %pK %8ld %s\n" :
12e6c419 OH	201	" %-5s %03x %08x %pK %pK %8ld %s\n";
0d66548a	202
ea00b8e2	203	seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
12e6c419	204	r->func, r->data, r->matches, r->ident);
0d66548a	205	}
0d66548a OH	206	}
0d66548a OH	207
ea00b8e2	208	static void can_print_recv_banner(struct seq_file *m)
0d66548a OH	209	{
	210	/*
	211	* can1. 00000000 00000000 00000000
	212	* ....... 0 tp20
	213	*/
ea00b8e2	214	seq_puts(m, " device can_id can_mask function"
0d66548a	215	" userdata matches ident\n");
0d66548a OH	216	}
0d66548a OH	217
ea00b8e2	218	static int can_stats_proc_show(struct seq_file m, void v)
0d66548a	219	{
ea00b8e2 AD	220	seq_putc(m, '\n');
	221	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
	222	seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
	223	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
0d66548a	224
ea00b8e2	225	seq_putc(m, '\n');
0d66548a OH	226
0d66548a OH	227	if (can_stattimer.function == can_stat_update) {
ea00b8e2	228	seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
0d66548a OH	229	can_stats.total_rx_match_ratio);
0d66548a OH	230
ea00b8e2	231	seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
0d66548a	232	can_stats.total_tx_rate);
ea00b8e2	233	seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
0d66548a OH	234	can_stats.total_rx_rate);
0d66548a OH	235
ea00b8e2	236	seq_putc(m, '\n');
0d66548a	237
ea00b8e2	238	seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
0d66548a OH	239	can_stats.current_rx_match_ratio);
0d66548a OH	240
ea00b8e2	241	seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
0d66548a	242	can_stats.current_tx_rate);
ea00b8e2	243	seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
0d66548a OH	244	can_stats.current_rx_rate);
0d66548a OH	245
ea00b8e2	246	seq_putc(m, '\n');
0d66548a	247
ea00b8e2	248	seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
0d66548a OH	249	can_stats.max_rx_match_ratio);
0d66548a OH	250
ea00b8e2	251	seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
0d66548a	252	can_stats.max_tx_rate);
ea00b8e2	253	seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
0d66548a OH	254	can_stats.max_rx_rate);
0d66548a OH	255
ea00b8e2	256	seq_putc(m, '\n');
0d66548a OH	257	}
0d66548a OH	258
ea00b8e2	259	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
0d66548a	260	can_pstats.rcv_entries);
ea00b8e2	261	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
0d66548a OH	262	can_pstats.rcv_entries_max);
	263
	264	if (can_pstats.stats_reset)
ea00b8e2	265	seq_printf(m, "\n %8ld statistic resets (STR)\n",
0d66548a OH	266	can_pstats.stats_reset);
	267
	268	if (can_pstats.user_reset)
ea00b8e2	269	seq_printf(m, " %8ld user statistic resets (USTR)\n",
0d66548a OH	270	can_pstats.user_reset);
0d66548a OH	271
ea00b8e2 AD	272	seq_putc(m, '\n');
ea00b8e2 AD	273	return 0;
0d66548a OH	274	}
0d66548a OH	275
ea00b8e2	276	static int can_stats_proc_open(struct inode inode, struct file file)
0d66548a	277	{
ea00b8e2 AD	278	return single_open(file, can_stats_proc_show, NULL);
	279	}
	280
	281	static const struct file_operations can_stats_proc_fops = {
	282	.owner = THIS_MODULE,
	283	.open = can_stats_proc_open,
	284	.read = seq_read,
	285	.llseek = seq_lseek,
	286	.release = single_release,
	287	};
0d66548a	288
ea00b8e2 AD	289	static int can_reset_stats_proc_show(struct seq_file m, void v)
ea00b8e2 AD	290	{
0d66548a OH	291	user_reset = 1;
	292
	293	if (can_stattimer.function == can_stat_update) {
ea00b8e2	294	seq_printf(m, "Scheduled statistic reset #%ld.\n",
0d66548a OH	295	can_pstats.stats_reset + 1);
	296
	297	} else {
	298	if (can_stats.jiffies_init != jiffies)
	299	can_init_stats();
	300
ea00b8e2	301	seq_printf(m, "Performed statistic reset #%ld.\n",
0d66548a OH	302	can_pstats.stats_reset);
0d66548a OH	303	}
ea00b8e2 AD	304	return 0;
ea00b8e2 AD	305	}
0d66548a	306
ea00b8e2 AD	307	static int can_reset_stats_proc_open(struct inode inode, struct file file)
	308	{
	309	return single_open(file, can_reset_stats_proc_show, NULL);
0d66548a OH	310	}
0d66548a OH	311
ea00b8e2 AD	312	static const struct file_operations can_reset_stats_proc_fops = {
	313	.owner = THIS_MODULE,
	314	.open = can_reset_stats_proc_open,
	315	.read = seq_read,
	316	.llseek = seq_lseek,
	317	.release = single_release,
	318	};
	319
	320	static int can_version_proc_show(struct seq_file m, void v)
0d66548a	321	{
ea00b8e2 AD	322	seq_printf(m, "%s\n", CAN_VERSION_STRING);
	323	return 0;
	324	}
0d66548a	325
ea00b8e2 AD	326	static int can_version_proc_open(struct inode inode, struct file file)
	327	{
	328	return single_open(file, can_version_proc_show, NULL);
0d66548a OH	329	}
0d66548a OH	330
ea00b8e2 AD	331	static const struct file_operations can_version_proc_fops = {
	332	.owner = THIS_MODULE,
	333	.open = can_version_proc_open,
	334	.read = seq_read,
	335	.llseek = seq_lseek,
	336	.release = single_release,
	337	};
	338
20dd3850 OH	339	static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
	340	struct net_device *dev,
	341	struct dev_rcv_lists *d)
	342	{
	343	if (!hlist_empty(&d->rx[idx])) {
	344	can_print_recv_banner(m);
	345	can_print_rcvlist(m, &d->rx[idx], dev);
	346	} else
	347	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	348
	349	}
	350
ea00b8e2	351	static int can_rcvlist_proc_show(struct seq_file m, void v)
0d66548a OH	352	{
0d66548a OH	353	/* double cast to prevent GCC warning */
ea00b8e2	354	int idx = (int)(long)m->private;
20dd3850	355	struct net_device *dev;
0d66548a	356	struct dev_rcv_lists *d;
0d66548a	357
ea00b8e2	358	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
0d66548a OH	359
0d66548a OH	360	rcu_read_lock();
0d66548a	361
20dd3850 OH	362	/* receive list for 'all' CAN devices (dev == NULL) */
	363	d = &can_rx_alldev_list;
	364	can_rcvlist_proc_show_one(m, idx, NULL, d);
	365
	366	/* receive list for registered CAN devices */
	367	for_each_netdev_rcu(&init_net, dev) {
	368	if (dev->type == ARPHRD_CAN && dev->ml_priv)
	369	can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
0d66548a	370	}
20dd3850	371
0d66548a OH	372	rcu_read_unlock();
0d66548a OH	373
ea00b8e2 AD	374	seq_putc(m, '\n');
	375	return 0;
	376	}
0d66548a	377
ea00b8e2 AD	378	static int can_rcvlist_proc_open(struct inode inode, struct file file)
ea00b8e2 AD	379	{
d9dda78b	380	return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode));
0d66548a OH	381	}
0d66548a OH	382
ea00b8e2 AD	383	static const struct file_operations can_rcvlist_proc_fops = {
	384	.owner = THIS_MODULE,
	385	.open = can_rcvlist_proc_open,
	386	.read = seq_read,
	387	.llseek = seq_lseek,
	388	.release = single_release,
	389	};
	390
e3d3917f OH	391	static inline void can_rcvlist_proc_show_array(struct seq_file *m,
	392	struct net_device *dev,
	393	struct hlist_head *rcv_array,
	394	unsigned int rcv_array_sz)
20dd3850	395	{
e3d3917f	396	unsigned int i;
20dd3850 OH	397	int all_empty = 1;
20dd3850 OH	398
48fc7f7e	399	/* check whether at least one list is non-empty */
e3d3917f OH	400	for (i = 0; i < rcv_array_sz; i++)
e3d3917f OH	401	if (!hlist_empty(&rcv_array[i])) {
20dd3850 OH	402	all_empty = 0;
	403	break;
	404	}
	405
	406	if (!all_empty) {
	407	can_print_recv_banner(m);
e3d3917f OH	408	for (i = 0; i < rcv_array_sz; i++) {
	409	if (!hlist_empty(&rcv_array[i]))
	410	can_print_rcvlist(m, &rcv_array[i], dev);
20dd3850 OH	411	}
	412	} else
	413	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	414	}
	415
ea00b8e2	416	static int can_rcvlist_sff_proc_show(struct seq_file m, void v)
0d66548a	417	{
20dd3850	418	struct net_device *dev;
0d66548a	419	struct dev_rcv_lists *d;
0d66548a OH	420
0d66548a OH	421	/* RX_SFF */
ea00b8e2	422	seq_puts(m, "\nreceive list 'rx_sff':\n");
0d66548a OH	423
0d66548a OH	424	rcu_read_lock();
20dd3850 OH	425
	426	/* sff receive list for 'all' CAN devices (dev == NULL) */
	427	d = &can_rx_alldev_list;
e3d3917f	428	can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
20dd3850 OH	429
	430	/* sff receive list for registered CAN devices */
	431	for_each_netdev_rcu(&init_net, dev) {
e3d3917f OH	432	if (dev->type == ARPHRD_CAN && dev->ml_priv) {
	433	d = dev->ml_priv;
	434	can_rcvlist_proc_show_array(m, dev, d->rx_sff,
	435	ARRAY_SIZE(d->rx_sff));
	436	}
0d66548a	437	}
20dd3850	438
0d66548a OH	439	rcu_read_unlock();
0d66548a OH	440
ea00b8e2 AD	441	seq_putc(m, '\n');
	442	return 0;
	443	}
0d66548a	444
ea00b8e2 AD	445	static int can_rcvlist_sff_proc_open(struct inode inode, struct file file)
	446	{
	447	return single_open(file, can_rcvlist_sff_proc_show, NULL);
0d66548a OH	448	}
0d66548a OH	449
ea00b8e2 AD	450	static const struct file_operations can_rcvlist_sff_proc_fops = {
	451	.owner = THIS_MODULE,
	452	.open = can_rcvlist_sff_proc_open,
	453	.read = seq_read,
	454	.llseek = seq_lseek,
	455	.release = single_release,
	456	};
	457
45c70029 OH	458
	459	static int can_rcvlist_eff_proc_show(struct seq_file m, void v)
	460	{
	461	struct net_device *dev;
	462	struct dev_rcv_lists *d;
	463
	464	/* RX_EFF */
	465	seq_puts(m, "\nreceive list 'rx_eff':\n");
	466
	467	rcu_read_lock();
	468
	469	/* eff receive list for 'all' CAN devices (dev == NULL) */
	470	d = &can_rx_alldev_list;
	471	can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
	472
	473	/* eff receive list for registered CAN devices */
	474	for_each_netdev_rcu(&init_net, dev) {
	475	if (dev->type == ARPHRD_CAN && dev->ml_priv) {
	476	d = dev->ml_priv;
	477	can_rcvlist_proc_show_array(m, dev, d->rx_eff,
	478	ARRAY_SIZE(d->rx_eff));
	479	}
	480	}
	481
	482	rcu_read_unlock();
	483
	484	seq_putc(m, '\n');
	485	return 0;
	486	}
	487
	488	static int can_rcvlist_eff_proc_open(struct inode inode, struct file file)
	489	{
	490	return single_open(file, can_rcvlist_eff_proc_show, NULL);
	491	}
	492
	493	static const struct file_operations can_rcvlist_eff_proc_fops = {
	494	.owner = THIS_MODULE,
	495	.open = can_rcvlist_eff_proc_open,
	496	.read = seq_read,
	497	.llseek = seq_lseek,
	498	.release = single_release,
	499	};
	500
0d66548a OH	501	/*
	502	* proc utility functions
	503	*/
	504
0d66548a OH	505	static void can_remove_proc_readentry(const char *name)
	506	{
	507	if (can_dir)
	508	remove_proc_entry(name, can_dir);
	509	}
	510
	511	/*
	512	* can_init_proc - create main CAN proc directory and procfs entries
	513	*/
	514	void can_init_proc(void)
	515	{
	516	/* create /proc/net/can directory */
	517	can_dir = proc_mkdir("can", init_net.proc_net);
	518
	519	if (!can_dir) {
	520	printk(KERN_INFO "can: failed to create /proc/net/can . "
	521	"CONFIG_PROC_FS missing?\n");
	522	return;
	523	}
	524
0d66548a	525	/* own procfs entries from the AF_CAN core */
ea00b8e2 AD	526	pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
	527	&can_version_proc_fops);
	528	pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
	529	&can_stats_proc_fops);
	530	pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
	531	&can_reset_stats_proc_fops);
	532	pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
	533	&can_rcvlist_proc_fops, (void *)RX_ERR);
	534	pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
	535	&can_rcvlist_proc_fops, (void *)RX_ALL);
	536	pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
	537	&can_rcvlist_proc_fops, (void *)RX_FIL);
	538	pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
	539	&can_rcvlist_proc_fops, (void *)RX_INV);
45c70029 OH	540	pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
45c70029 OH	541	&can_rcvlist_eff_proc_fops);
ea00b8e2 AD	542	pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
ea00b8e2 AD	543	&can_rcvlist_sff_proc_fops);
0d66548a OH	544	}
	545
	546	/*
	547	* can_remove_proc - remove procfs entries and main CAN proc directory
	548	*/
	549	void can_remove_proc(void)
	550	{
	551	if (pde_version)
	552	can_remove_proc_readentry(CAN_PROC_VERSION);
	553
	554	if (pde_stats)
	555	can_remove_proc_readentry(CAN_PROC_STATS);
	556
	557	if (pde_reset_stats)
	558	can_remove_proc_readentry(CAN_PROC_RESET_STATS);
	559
	560	if (pde_rcvlist_err)
	561	can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
	562
	563	if (pde_rcvlist_all)
	564	can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
	565
	566	if (pde_rcvlist_fil)
	567	can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
	568
	569	if (pde_rcvlist_inv)
	570	can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
	571
	572	if (pde_rcvlist_eff)
	573	can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
	574
	575	if (pde_rcvlist_sff)
	576	can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
	577
	578	if (can_dir)
ece31ffd	579	remove_proc_entry("can", init_net.proc_net);
0d66548a	580	}