[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",
	[RX_EFF] = "rx_eff",
};

/*
 * 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;
	struct hlist_node *n;

	hlist_for_each_entry_rcu(r, n, 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(inode)->data);
}

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_sff_proc_show_one(struct seq_file *m,
						 struct net_device *dev,
						 struct dev_rcv_lists *d)
{
	int i;
	int all_empty = 1;

	/* check whether at least one list is non-empty */
	for (i = 0; i < 0x800; i++)
		if (!hlist_empty(&d->rx_sff[i])) {
			all_empty = 0;
			break;
		}

	if (!all_empty) {
		can_print_recv_banner(m);
		for (i = 0; i < 0x800; i++) {
			if (!hlist_empty(&d->rx_sff[i]))
				can_print_rcvlist(m, &d->rx_sff[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_sff_proc_show_one(m, NULL, d);

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

	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,
};

/*
 * 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_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
					   &can_rcvlist_proc_fops, (void *)RX_EFF);
	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)
		proc_net_remove(&init_net, "can");
}
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",
	83	[RX_EFF] = "rx_eff",
	84	};
	85
	86	/*
	87	* af_can statistics stuff
	88	*/
	89
	90	static void can_init_stats(void)
	91	{
	92	/*
	93	* This memset function is called from a timer context (when
	94	* can_stattimer is active which is the default) OR in a process
	95	* context (reading the proc_fs when can_stattimer is disabled).
	96	*/
	97	memset(&can_stats, 0, sizeof(can_stats));
	98	can_stats.jiffies_init = jiffies;
	99
	100	can_pstats.stats_reset++;
	101
	102	if (user_reset) {
	103	user_reset = 0;
	104	can_pstats.user_reset++;
	105	}
	106	}
	107
	108	static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
	109	unsigned long count)
	110	{
111	unsigned long rate;
112
113	if (oldjif == newjif)
114	return 0;
115
116	/* see can_stat_update() - this should NEVER happen! */
117	if (count > (ULONG_MAX / HZ)) {
118	printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
119	count);
120	return 99999999;
121	}
122
123	rate = (count * HZ) / (newjif - oldjif);
124
125	return rate;
126	}
127
128	void can_stat_update(unsigned long data)
129	{
130	unsigned long j = jiffies; /* snapshot */
131
132	/* restart counting in timer context on user request */
133	if (user_reset)
134	can_init_stats();
135
136	/* restart counting on jiffies overflow */
137	if (j < can_stats.jiffies_init)
138	can_init_stats();
139
140	/* prevent overflow in calc_rate() */
141	if (can_stats.rx_frames > (ULONG_MAX / HZ))
142	can_init_stats();
143
144	/* prevent overflow in calc_rate() */
145	if (can_stats.tx_frames > (ULONG_MAX / HZ))
146	can_init_stats();
147
148	/* matches overflow - very improbable */
149	if (can_stats.matches > (ULONG_MAX / 100))
150	can_init_stats();
151
152	/* calc total values */
153	if (can_stats.rx_frames)
154	can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
155	can_stats.rx_frames;
156
157	can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
158	can_stats.tx_frames);
159	can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
160	can_stats.rx_frames);
161
162	/* calc current values */
163	if (can_stats.rx_frames_delta)
164	can_stats.current_rx_match_ratio =
165	(can_stats.matches_delta * 100) /
166	can_stats.rx_frames_delta;
167
168	can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
169	can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
170
171	/* check / update maximum values */
172	if (can_stats.max_tx_rate < can_stats.current_tx_rate)
173	can_stats.max_tx_rate = can_stats.current_tx_rate;
174
175	if (can_stats.max_rx_rate < can_stats.current_rx_rate)
176	can_stats.max_rx_rate = can_stats.current_rx_rate;
177
178	if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
179	can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
180
181	/* clear values for 'current rate' calculation */
182	can_stats.tx_frames_delta = 0;
183	can_stats.rx_frames_delta = 0;
184	can_stats.matches_delta = 0;
185
186	/* restart timer (one second) */
187	mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
188	}
189
190	/*
191	* proc read functions
0d66548a OH	192	*/
0d66548a OH	193
ea00b8e2 AD	194	static void can_print_rcvlist(struct seq_file m, struct hlist_head rx_list,
ea00b8e2 AD	195	struct net_device *dev)
0d66548a OH	196	{
	197	struct receiver *r;
	198	struct hlist_node *n;
	199
0d66548a OH	200	hlist_for_each_entry_rcu(r, n, rx_list, list) {
0d66548a OH	201	char *fmt = (r->can_id & CAN_EFF_FLAG)?
12e6c419 OH	202	" %-5s %08x %08x %pK %pK %8ld %s\n" :
12e6c419 OH	203	" %-5s %03x %08x %pK %pK %8ld %s\n";
0d66548a	204
ea00b8e2	205	seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
12e6c419	206	r->func, r->data, r->matches, r->ident);
0d66548a	207	}
0d66548a OH	208	}
0d66548a OH	209
ea00b8e2	210	static void can_print_recv_banner(struct seq_file *m)
0d66548a OH	211	{
	212	/*
	213	* can1. 00000000 00000000 00000000
	214	* ....... 0 tp20
	215	*/
ea00b8e2	216	seq_puts(m, " device can_id can_mask function"
0d66548a	217	" userdata matches ident\n");
0d66548a OH	218	}
0d66548a OH	219
ea00b8e2	220	static int can_stats_proc_show(struct seq_file m, void v)
0d66548a	221	{
ea00b8e2 AD	222	seq_putc(m, '\n');
	223	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
	224	seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
	225	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
0d66548a	226
ea00b8e2	227	seq_putc(m, '\n');
0d66548a OH	228
0d66548a OH	229	if (can_stattimer.function == can_stat_update) {
ea00b8e2	230	seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
0d66548a OH	231	can_stats.total_rx_match_ratio);
0d66548a OH	232
ea00b8e2	233	seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
0d66548a	234	can_stats.total_tx_rate);
ea00b8e2	235	seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
0d66548a OH	236	can_stats.total_rx_rate);
0d66548a OH	237
ea00b8e2	238	seq_putc(m, '\n');
0d66548a	239
ea00b8e2	240	seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
0d66548a OH	241	can_stats.current_rx_match_ratio);
0d66548a OH	242
ea00b8e2	243	seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
0d66548a	244	can_stats.current_tx_rate);
ea00b8e2	245	seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
0d66548a OH	246	can_stats.current_rx_rate);
0d66548a OH	247
ea00b8e2	248	seq_putc(m, '\n');
0d66548a	249
ea00b8e2	250	seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
0d66548a OH	251	can_stats.max_rx_match_ratio);
0d66548a OH	252
ea00b8e2	253	seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
0d66548a	254	can_stats.max_tx_rate);
ea00b8e2	255	seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
0d66548a OH	256	can_stats.max_rx_rate);
0d66548a OH	257
ea00b8e2	258	seq_putc(m, '\n');
0d66548a OH	259	}
0d66548a OH	260
ea00b8e2	261	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
0d66548a	262	can_pstats.rcv_entries);
ea00b8e2	263	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
0d66548a OH	264	can_pstats.rcv_entries_max);
	265
	266	if (can_pstats.stats_reset)
ea00b8e2	267	seq_printf(m, "\n %8ld statistic resets (STR)\n",
0d66548a OH	268	can_pstats.stats_reset);
	269
	270	if (can_pstats.user_reset)
ea00b8e2	271	seq_printf(m, " %8ld user statistic resets (USTR)\n",
0d66548a OH	272	can_pstats.user_reset);
0d66548a OH	273
ea00b8e2 AD	274	seq_putc(m, '\n');
ea00b8e2 AD	275	return 0;
0d66548a OH	276	}
0d66548a OH	277
ea00b8e2	278	static int can_stats_proc_open(struct inode inode, struct file file)
0d66548a	279	{
ea00b8e2 AD	280	return single_open(file, can_stats_proc_show, NULL);
	281	}
	282
	283	static const struct file_operations can_stats_proc_fops = {
	284	.owner = THIS_MODULE,
	285	.open = can_stats_proc_open,
	286	.read = seq_read,
	287	.llseek = seq_lseek,
	288	.release = single_release,
	289	};
0d66548a	290
ea00b8e2 AD	291	static int can_reset_stats_proc_show(struct seq_file m, void v)
ea00b8e2 AD	292	{
0d66548a OH	293	user_reset = 1;
	294
	295	if (can_stattimer.function == can_stat_update) {
ea00b8e2	296	seq_printf(m, "Scheduled statistic reset #%ld.\n",
0d66548a OH	297	can_pstats.stats_reset + 1);
	298
	299	} else {
	300	if (can_stats.jiffies_init != jiffies)
	301	can_init_stats();
	302
ea00b8e2	303	seq_printf(m, "Performed statistic reset #%ld.\n",
0d66548a OH	304	can_pstats.stats_reset);
0d66548a OH	305	}
ea00b8e2 AD	306	return 0;
ea00b8e2 AD	307	}
0d66548a	308
ea00b8e2 AD	309	static int can_reset_stats_proc_open(struct inode inode, struct file file)
	310	{
	311	return single_open(file, can_reset_stats_proc_show, NULL);
0d66548a OH	312	}
0d66548a OH	313
ea00b8e2 AD	314	static const struct file_operations can_reset_stats_proc_fops = {
	315	.owner = THIS_MODULE,
	316	.open = can_reset_stats_proc_open,
	317	.read = seq_read,
	318	.llseek = seq_lseek,
	319	.release = single_release,
	320	};
	321
	322	static int can_version_proc_show(struct seq_file m, void v)
0d66548a	323	{
ea00b8e2 AD	324	seq_printf(m, "%s\n", CAN_VERSION_STRING);
	325	return 0;
	326	}
0d66548a	327
ea00b8e2 AD	328	static int can_version_proc_open(struct inode inode, struct file file)
	329	{
	330	return single_open(file, can_version_proc_show, NULL);
0d66548a OH	331	}
0d66548a OH	332
ea00b8e2 AD	333	static const struct file_operations can_version_proc_fops = {
	334	.owner = THIS_MODULE,
	335	.open = can_version_proc_open,
	336	.read = seq_read,
	337	.llseek = seq_lseek,
	338	.release = single_release,
	339	};
	340
20dd3850 OH	341	static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
	342	struct net_device *dev,
	343	struct dev_rcv_lists *d)
	344	{
	345	if (!hlist_empty(&d->rx[idx])) {
	346	can_print_recv_banner(m);
	347	can_print_rcvlist(m, &d->rx[idx], dev);
	348	} else
	349	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	350
	351	}
	352
ea00b8e2	353	static int can_rcvlist_proc_show(struct seq_file m, void v)
0d66548a OH	354	{
0d66548a OH	355	/* double cast to prevent GCC warning */
ea00b8e2	356	int idx = (int)(long)m->private;
20dd3850	357	struct net_device *dev;
0d66548a	358	struct dev_rcv_lists *d;
0d66548a	359
ea00b8e2	360	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
0d66548a OH	361
0d66548a OH	362	rcu_read_lock();
0d66548a	363
20dd3850 OH	364	/* receive list for 'all' CAN devices (dev == NULL) */
	365	d = &can_rx_alldev_list;
	366	can_rcvlist_proc_show_one(m, idx, NULL, d);
	367
	368	/* receive list for registered CAN devices */
	369	for_each_netdev_rcu(&init_net, dev) {
	370	if (dev->type == ARPHRD_CAN && dev->ml_priv)
	371	can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
0d66548a	372	}
20dd3850	373
0d66548a OH	374	rcu_read_unlock();
0d66548a OH	375
ea00b8e2 AD	376	seq_putc(m, '\n');
	377	return 0;
	378	}
0d66548a	379
ea00b8e2 AD	380	static int can_rcvlist_proc_open(struct inode inode, struct file file)
	381	{
	382	return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
0d66548a OH	383	}
0d66548a OH	384
ea00b8e2 AD	385	static const struct file_operations can_rcvlist_proc_fops = {
	386	.owner = THIS_MODULE,
	387	.open = can_rcvlist_proc_open,
	388	.read = seq_read,
	389	.llseek = seq_lseek,
	390	.release = single_release,
	391	};
	392
20dd3850 OH	393	static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
	394	struct net_device *dev,
	395	struct dev_rcv_lists *d)
	396	{
	397	int i;
	398	int all_empty = 1;
	399
48fc7f7e	400	/* check whether at least one list is non-empty */
20dd3850 OH	401	for (i = 0; i < 0x800; i++)
	402	if (!hlist_empty(&d->rx_sff[i])) {
	403	all_empty = 0;
	404	break;
	405	}
	406
	407	if (!all_empty) {
	408	can_print_recv_banner(m);
	409	for (i = 0; i < 0x800; i++) {
	410	if (!hlist_empty(&d->rx_sff[i]))
	411	can_print_rcvlist(m, &d->rx_sff[i], dev);
	412	}
	413	} else
	414	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	415	}
	416
ea00b8e2	417	static int can_rcvlist_sff_proc_show(struct seq_file m, void v)
0d66548a	418	{
20dd3850	419	struct net_device *dev;
0d66548a	420	struct dev_rcv_lists *d;
0d66548a OH	421
0d66548a OH	422	/* RX_SFF */
ea00b8e2	423	seq_puts(m, "\nreceive list 'rx_sff':\n");
0d66548a OH	424
0d66548a OH	425	rcu_read_lock();
20dd3850 OH	426
	427	/* sff receive list for 'all' CAN devices (dev == NULL) */
	428	d = &can_rx_alldev_list;
	429	can_rcvlist_sff_proc_show_one(m, NULL, d);
	430
	431	/* sff receive list for registered CAN devices */
	432	for_each_netdev_rcu(&init_net, dev) {
	433	if (dev->type == ARPHRD_CAN && dev->ml_priv)
	434	can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
0d66548a	435	}
20dd3850	436
0d66548a OH	437	rcu_read_unlock();
0d66548a OH	438
ea00b8e2 AD	439	seq_putc(m, '\n');
	440	return 0;
	441	}
0d66548a	442
ea00b8e2 AD	443	static int can_rcvlist_sff_proc_open(struct inode inode, struct file file)
	444	{
	445	return single_open(file, can_rcvlist_sff_proc_show, NULL);
0d66548a OH	446	}
0d66548a OH	447
ea00b8e2 AD	448	static const struct file_operations can_rcvlist_sff_proc_fops = {
	449	.owner = THIS_MODULE,
	450	.open = can_rcvlist_sff_proc_open,
	451	.read = seq_read,
	452	.llseek = seq_lseek,
	453	.release = single_release,
	454	};
	455
0d66548a OH	456	/*
	457	* proc utility functions
	458	*/
	459
0d66548a OH	460	static void can_remove_proc_readentry(const char *name)
	461	{
	462	if (can_dir)
	463	remove_proc_entry(name, can_dir);
	464	}
	465
	466	/*
	467	* can_init_proc - create main CAN proc directory and procfs entries
	468	*/
	469	void can_init_proc(void)
	470	{
	471	/* create /proc/net/can directory */
	472	can_dir = proc_mkdir("can", init_net.proc_net);
	473
	474	if (!can_dir) {
	475	printk(KERN_INFO "can: failed to create /proc/net/can . "
	476	"CONFIG_PROC_FS missing?\n");
	477	return;
	478	}
	479
0d66548a	480	/* own procfs entries from the AF_CAN core */
ea00b8e2 AD	481	pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
	482	&can_version_proc_fops);
	483	pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
	484	&can_stats_proc_fops);
	485	pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
	486	&can_reset_stats_proc_fops);
	487	pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
	488	&can_rcvlist_proc_fops, (void *)RX_ERR);
	489	pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
	490	&can_rcvlist_proc_fops, (void *)RX_ALL);
	491	pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
	492	&can_rcvlist_proc_fops, (void *)RX_FIL);
	493	pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
	494	&can_rcvlist_proc_fops, (void *)RX_INV);
	495	pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
	496	&can_rcvlist_proc_fops, (void *)RX_EFF);
	497	pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
	498	&can_rcvlist_sff_proc_fops);
0d66548a OH	499	}
	500
	501	/*
	502	* can_remove_proc - remove procfs entries and main CAN proc directory
	503	*/
	504	void can_remove_proc(void)
	505	{
	506	if (pde_version)
	507	can_remove_proc_readentry(CAN_PROC_VERSION);
	508
	509	if (pde_stats)
	510	can_remove_proc_readentry(CAN_PROC_STATS);
	511
	512	if (pde_reset_stats)
	513	can_remove_proc_readentry(CAN_PROC_RESET_STATS);
	514
	515	if (pde_rcvlist_err)
	516	can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
	517
	518	if (pde_rcvlist_all)
	519	can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
	520
	521	if (pde_rcvlist_fil)
	522	can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
	523
	524	if (pde_rcvlist_inv)
	525	can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
	526
	527	if (pde_rcvlist_eff)
	528	can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
	529
	530	if (pde_rcvlist_sff)
	531	can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
	532
	533	if (can_dir)
	534	proc_net_remove(&init_net, "can");
	535	}