[GitHub/mt8127/android_kernel_alcatel_ttab.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.
 *
 * Send feedback to <socketcan-users@lists.berlios.de>
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/rcupdate.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
 *
 * From known use-cases we expect about 10 entries in a receive list to be
 * printed in the proc_fs. So PAGE_SIZE is definitely enough space here.
 *
 */

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;

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

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

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

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

	rcu_read_lock();
	hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {

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

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

	rcu_read_lock();
	hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
		int i, all_empty = 1;
		/* check wether 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],
							  d->dev);
			}
		} else
			seq_printf(m, "  (%s: no entry)\n", DNAME(d->dev));
	}
	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	*
	40	* Send feedback to <socketcan-users@lists.berlios.de>
	41	*
	42	*/
	43
	44	#include <linux/module.h>
	45	#include <linux/proc_fs.h>
	46	#include <linux/list.h>
	47	#include <linux/rcupdate.h>
	48	#include <linux/can/core.h>
	49
	50	#include "af_can.h"
	51
	52	/*
	53	* proc filenames for the PF_CAN core
	54	*/
	55
	56	#define CAN_PROC_VERSION "version"
	57	#define CAN_PROC_STATS "stats"
	58	#define CAN_PROC_RESET_STATS "reset_stats"
	59	#define CAN_PROC_RCVLIST_ALL "rcvlist_all"
	60	#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
	61	#define CAN_PROC_RCVLIST_INV "rcvlist_inv"
	62	#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
	63	#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
	64	#define CAN_PROC_RCVLIST_ERR "rcvlist_err"
65
66	static struct proc_dir_entry *can_dir;
67	static struct proc_dir_entry *pde_version;
68	static struct proc_dir_entry *pde_stats;
69	static struct proc_dir_entry *pde_reset_stats;
70	static struct proc_dir_entry *pde_rcvlist_all;
71	static struct proc_dir_entry *pde_rcvlist_fil;
72	static struct proc_dir_entry *pde_rcvlist_inv;
73	static struct proc_dir_entry *pde_rcvlist_sff;
74	static struct proc_dir_entry *pde_rcvlist_eff;
75	static struct proc_dir_entry *pde_rcvlist_err;
76
77	static int user_reset;
78
79	static const char rx_list_name[][8] = {
80	[RX_ERR] = "rx_err",
81	[RX_ALL] = "rx_all",
82	[RX_FIL] = "rx_fil",
83	[RX_INV] = "rx_inv",
84	[RX_EFF] = "rx_eff",
85	};
86
87	/*
88	* af_can statistics stuff
89	*/
90
91	static void can_init_stats(void)
92	{
93	/*
94	* This memset function is called from a timer context (when
95	* can_stattimer is active which is the default) OR in a process
96	* context (reading the proc_fs when can_stattimer is disabled).
97	*/
98	memset(&can_stats, 0, sizeof(can_stats));
99	can_stats.jiffies_init = jiffies;
100
101	can_pstats.stats_reset++;
102
103	if (user_reset) {
104	user_reset = 0;
105	can_pstats.user_reset++;
106	}
107	}
108
109	static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
110	unsigned long count)
111	{
112	unsigned long rate;
113
114	if (oldjif == newjif)
115	return 0;
116
117	/* see can_stat_update() - this should NEVER happen! */
118	if (count > (ULONG_MAX / HZ)) {
119	printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
120	count);
121	return 99999999;
122	}
123
124	rate = (count * HZ) / (newjif - oldjif);
125
126	return rate;
127	}
128
129	void can_stat_update(unsigned long data)
130	{
131	unsigned long j = jiffies; /* snapshot */
132
133	/* restart counting in timer context on user request */
134	if (user_reset)
135	can_init_stats();
136
137	/* restart counting on jiffies overflow */
138	if (j < can_stats.jiffies_init)
139	can_init_stats();
140
141	/* prevent overflow in calc_rate() */
142	if (can_stats.rx_frames > (ULONG_MAX / HZ))
143	can_init_stats();
144
145	/* prevent overflow in calc_rate() */
146	if (can_stats.tx_frames > (ULONG_MAX / HZ))
147	can_init_stats();
148
149	/* matches overflow - very improbable */
150	if (can_stats.matches > (ULONG_MAX / 100))
151	can_init_stats();
152
153	/* calc total values */
154	if (can_stats.rx_frames)
155	can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
156	can_stats.rx_frames;
157
158	can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
159	can_stats.tx_frames);
160	can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
161	can_stats.rx_frames);
162
163	/* calc current values */
164	if (can_stats.rx_frames_delta)
165	can_stats.current_rx_match_ratio =
166	(can_stats.matches_delta * 100) /
167	can_stats.rx_frames_delta;
168
169	can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
170	can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
171
172	/* check / update maximum values */
173	if (can_stats.max_tx_rate < can_stats.current_tx_rate)
174	can_stats.max_tx_rate = can_stats.current_tx_rate;
175
176	if (can_stats.max_rx_rate < can_stats.current_rx_rate)
177	can_stats.max_rx_rate = can_stats.current_rx_rate;
178
179	if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
180	can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
181
182	/* clear values for 'current rate' calculation */
183	can_stats.tx_frames_delta = 0;
184	can_stats.rx_frames_delta = 0;
185	can_stats.matches_delta = 0;
186
187	/* restart timer (one second) */
188	mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
189	}
190
191	/*
192	* proc read functions
193	*
194	* From known use-cases we expect about 10 entries in a receive list to be
195	* printed in the proc_fs. So PAGE_SIZE is definitely enough space here.
196	*
197	*/
198
ea00b8e2 AD	199	static void can_print_rcvlist(struct seq_file m, struct hlist_head rx_list,
ea00b8e2 AD	200	struct net_device *dev)
0d66548a OH	201	{
	202	struct receiver *r;
	203	struct hlist_node *n;
	204
	205	rcu_read_lock();
	206	hlist_for_each_entry_rcu(r, n, rx_list, list) {
	207	char *fmt = (r->can_id & CAN_EFF_FLAG)?
	208	" %-5s %08X %08x %08x %08x %8ld %s\n" :
	209	" %-5s %03X %08x %08lx %08lx %8ld %s\n";
	210
ea00b8e2	211	seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
0d66548a OH	212	(unsigned long)r->func, (unsigned long)r->data,
0d66548a OH	213	r->matches, r->ident);
0d66548a OH	214	}
0d66548a OH	215	rcu_read_unlock();
0d66548a OH	216	}
0d66548a OH	217
ea00b8e2	218	static void can_print_recv_banner(struct seq_file *m)
0d66548a OH	219	{
	220	/*
	221	* can1. 00000000 00000000 00000000
	222	* ....... 0 tp20
	223	*/
ea00b8e2	224	seq_puts(m, " device can_id can_mask function"
0d66548a	225	" userdata matches ident\n");
0d66548a OH	226	}
0d66548a OH	227
ea00b8e2	228	static int can_stats_proc_show(struct seq_file m, void v)
0d66548a	229	{
ea00b8e2 AD	230	seq_putc(m, '\n');
	231	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
	232	seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
	233	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
0d66548a	234
ea00b8e2	235	seq_putc(m, '\n');
0d66548a OH	236
0d66548a OH	237	if (can_stattimer.function == can_stat_update) {
ea00b8e2	238	seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
0d66548a OH	239	can_stats.total_rx_match_ratio);
0d66548a OH	240
ea00b8e2	241	seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
0d66548a	242	can_stats.total_tx_rate);
ea00b8e2	243	seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
0d66548a OH	244	can_stats.total_rx_rate);
0d66548a OH	245
ea00b8e2	246	seq_putc(m, '\n');
0d66548a	247
ea00b8e2	248	seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
0d66548a OH	249	can_stats.current_rx_match_ratio);
0d66548a OH	250
ea00b8e2	251	seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
0d66548a	252	can_stats.current_tx_rate);
ea00b8e2	253	seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
0d66548a OH	254	can_stats.current_rx_rate);
0d66548a OH	255
ea00b8e2	256	seq_putc(m, '\n');
0d66548a	257
ea00b8e2	258	seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
0d66548a OH	259	can_stats.max_rx_match_ratio);
0d66548a OH	260
ea00b8e2	261	seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
0d66548a	262	can_stats.max_tx_rate);
ea00b8e2	263	seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
0d66548a OH	264	can_stats.max_rx_rate);
0d66548a OH	265
ea00b8e2	266	seq_putc(m, '\n');
0d66548a OH	267	}
0d66548a OH	268
ea00b8e2	269	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
0d66548a	270	can_pstats.rcv_entries);
ea00b8e2	271	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
0d66548a OH	272	can_pstats.rcv_entries_max);
	273
	274	if (can_pstats.stats_reset)
ea00b8e2	275	seq_printf(m, "\n %8ld statistic resets (STR)\n",
0d66548a OH	276	can_pstats.stats_reset);
	277
	278	if (can_pstats.user_reset)
ea00b8e2	279	seq_printf(m, " %8ld user statistic resets (USTR)\n",
0d66548a OH	280	can_pstats.user_reset);
0d66548a OH	281
ea00b8e2 AD	282	seq_putc(m, '\n');
ea00b8e2 AD	283	return 0;
0d66548a OH	284	}
0d66548a OH	285
ea00b8e2	286	static int can_stats_proc_open(struct inode inode, struct file file)
0d66548a	287	{
ea00b8e2 AD	288	return single_open(file, can_stats_proc_show, NULL);
	289	}
	290
	291	static const struct file_operations can_stats_proc_fops = {
	292	.owner = THIS_MODULE,
	293	.open = can_stats_proc_open,
	294	.read = seq_read,
	295	.llseek = seq_lseek,
	296	.release = single_release,
	297	};
0d66548a	298
ea00b8e2 AD	299	static int can_reset_stats_proc_show(struct seq_file m, void v)
ea00b8e2 AD	300	{
0d66548a OH	301	user_reset = 1;
	302
	303	if (can_stattimer.function == can_stat_update) {
ea00b8e2	304	seq_printf(m, "Scheduled statistic reset #%ld.\n",
0d66548a OH	305	can_pstats.stats_reset + 1);
	306
	307	} else {
	308	if (can_stats.jiffies_init != jiffies)
	309	can_init_stats();
	310
ea00b8e2	311	seq_printf(m, "Performed statistic reset #%ld.\n",
0d66548a OH	312	can_pstats.stats_reset);
0d66548a OH	313	}
ea00b8e2 AD	314	return 0;
ea00b8e2 AD	315	}
0d66548a	316
ea00b8e2 AD	317	static int can_reset_stats_proc_open(struct inode inode, struct file file)
	318	{
	319	return single_open(file, can_reset_stats_proc_show, NULL);
0d66548a OH	320	}
0d66548a OH	321
ea00b8e2 AD	322	static const struct file_operations can_reset_stats_proc_fops = {
	323	.owner = THIS_MODULE,
	324	.open = can_reset_stats_proc_open,
	325	.read = seq_read,
	326	.llseek = seq_lseek,
	327	.release = single_release,
	328	};
	329
	330	static int can_version_proc_show(struct seq_file m, void v)
0d66548a	331	{
ea00b8e2 AD	332	seq_printf(m, "%s\n", CAN_VERSION_STRING);
	333	return 0;
	334	}
0d66548a	335
ea00b8e2 AD	336	static int can_version_proc_open(struct inode inode, struct file file)
	337	{
	338	return single_open(file, can_version_proc_show, NULL);
0d66548a OH	339	}
0d66548a OH	340
ea00b8e2 AD	341	static const struct file_operations can_version_proc_fops = {
	342	.owner = THIS_MODULE,
	343	.open = can_version_proc_open,
	344	.read = seq_read,
	345	.llseek = seq_lseek,
	346	.release = single_release,
	347	};
	348
	349	static int can_rcvlist_proc_show(struct seq_file m, void v)
0d66548a OH	350	{
0d66548a OH	351	/* double cast to prevent GCC warning */
ea00b8e2	352	int idx = (int)(long)m->private;
0d66548a OH	353	struct dev_rcv_lists *d;
	354	struct hlist_node *n;
	355
ea00b8e2	356	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
0d66548a OH	357
	358	rcu_read_lock();
	359	hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
	360
	361	if (!hlist_empty(&d->rx[idx])) {
ea00b8e2 AD	362	can_print_recv_banner(m);
ea00b8e2 AD	363	can_print_rcvlist(m, &d->rx[idx], d->dev);
0d66548a	364	} else
ea00b8e2	365	seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
0d66548a OH	366	}
	367	rcu_read_unlock();
	368
ea00b8e2 AD	369	seq_putc(m, '\n');
	370	return 0;
	371	}
0d66548a	372
ea00b8e2 AD	373	static int can_rcvlist_proc_open(struct inode inode, struct file file)
	374	{
	375	return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
0d66548a OH	376	}
0d66548a OH	377
ea00b8e2 AD	378	static const struct file_operations can_rcvlist_proc_fops = {
	379	.owner = THIS_MODULE,
	380	.open = can_rcvlist_proc_open,
	381	.read = seq_read,
	382	.llseek = seq_lseek,
	383	.release = single_release,
	384	};
	385
	386	static int can_rcvlist_sff_proc_show(struct seq_file m, void v)
0d66548a	387	{
0d66548a OH	388	struct dev_rcv_lists *d;
	389	struct hlist_node *n;
	390
	391	/* RX_SFF */
ea00b8e2	392	seq_puts(m, "\nreceive list 'rx_sff':\n");
0d66548a OH	393
	394	rcu_read_lock();
	395	hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
	396	int i, all_empty = 1;
	397	/* check wether at least one list is non-empty */
	398	for (i = 0; i < 0x800; i++)
	399	if (!hlist_empty(&d->rx_sff[i])) {
	400	all_empty = 0;
	401	break;
	402	}
	403
	404	if (!all_empty) {
ea00b8e2	405	can_print_recv_banner(m);
0d66548a	406	for (i = 0; i < 0x800; i++) {
ea00b8e2 AD	407	if (!hlist_empty(&d->rx_sff[i]))
	408	can_print_rcvlist(m, &d->rx_sff[i],
	409	d->dev);
0d66548a OH	410	}
0d66548a OH	411	} else
ea00b8e2	412	seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
0d66548a OH	413	}
	414	rcu_read_unlock();
	415
ea00b8e2 AD	416	seq_putc(m, '\n');
	417	return 0;
	418	}
0d66548a	419
ea00b8e2 AD	420	static int can_rcvlist_sff_proc_open(struct inode inode, struct file file)
	421	{
	422	return single_open(file, can_rcvlist_sff_proc_show, NULL);
0d66548a OH	423	}
0d66548a OH	424
ea00b8e2 AD	425	static const struct file_operations can_rcvlist_sff_proc_fops = {
	426	.owner = THIS_MODULE,
	427	.open = can_rcvlist_sff_proc_open,
	428	.read = seq_read,
	429	.llseek = seq_lseek,
	430	.release = single_release,
	431	};
	432
0d66548a OH	433	/*
	434	* proc utility functions
	435	*/
	436
0d66548a OH	437	static void can_remove_proc_readentry(const char *name)
	438	{
	439	if (can_dir)
	440	remove_proc_entry(name, can_dir);
	441	}
	442
	443	/*
	444	* can_init_proc - create main CAN proc directory and procfs entries
	445	*/
	446	void can_init_proc(void)
	447	{
	448	/* create /proc/net/can directory */
	449	can_dir = proc_mkdir("can", init_net.proc_net);
	450
	451	if (!can_dir) {
	452	printk(KERN_INFO "can: failed to create /proc/net/can . "
	453	"CONFIG_PROC_FS missing?\n");
	454	return;
	455	}
	456
0d66548a	457	/* own procfs entries from the AF_CAN core */
ea00b8e2 AD	458	pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
	459	&can_version_proc_fops);
	460	pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
	461	&can_stats_proc_fops);
	462	pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
	463	&can_reset_stats_proc_fops);
	464	pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
	465	&can_rcvlist_proc_fops, (void *)RX_ERR);
	466	pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
	467	&can_rcvlist_proc_fops, (void *)RX_ALL);
	468	pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
	469	&can_rcvlist_proc_fops, (void *)RX_FIL);
	470	pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
	471	&can_rcvlist_proc_fops, (void *)RX_INV);
	472	pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
	473	&can_rcvlist_proc_fops, (void *)RX_EFF);
	474	pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
	475	&can_rcvlist_sff_proc_fops);
0d66548a OH	476	}
	477
	478	/*
	479	* can_remove_proc - remove procfs entries and main CAN proc directory
	480	*/
	481	void can_remove_proc(void)
	482	{
	483	if (pde_version)
	484	can_remove_proc_readentry(CAN_PROC_VERSION);
	485
	486	if (pde_stats)
	487	can_remove_proc_readentry(CAN_PROC_STATS);
	488
	489	if (pde_reset_stats)
	490	can_remove_proc_readentry(CAN_PROC_RESET_STATS);
	491
	492	if (pde_rcvlist_err)
	493	can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
	494
	495	if (pde_rcvlist_all)
	496	can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
	497
	498	if (pde_rcvlist_fil)
	499	can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
	500
	501	if (pde_rcvlist_inv)
	502	can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
	503
	504	if (pde_rcvlist_eff)
	505	can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
	506
	507	if (pde_rcvlist_sff)
	508	can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
	509
	510	if (can_dir)
	511	proc_net_remove(&init_net, "can");
	512	}