[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 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(struct net *net)
{
	struct s_stats *can_stats = net->can.can_stats;
	struct s_pstats *can_pstats = net->can.can_pstats;
	/*
	 * 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(struct s_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(struct timer_list *t)
{
	struct net *net = from_timer(net, t, can.can_stattimer);
	struct s_stats *can_stats = net->can.can_stats;
	unsigned long j = jiffies; /* snapshot */

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

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

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

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

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

	/* 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(&net->can.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)
{
	struct net *net = m->private;
	struct s_stats *can_stats = net->can.can_stats;
	struct s_pstats *can_pstats = net->can.can_pstats;

	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 (net->can.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_reset_stats_proc_show(struct seq_file *m, void *v)
{
	struct net *net = m->private;
	struct s_pstats *can_pstats = net->can.can_pstats;
	struct s_stats *can_stats = net->can.can_stats;

	user_reset = 1;

	if (net->can.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(net);

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

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

static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
					     struct net_device *dev,
					     struct can_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)PDE_DATA(m->file->f_inode);
	struct net_device *dev;
	struct can_dev_rcv_lists *d;
	struct net *net = m->private;

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

	rcu_read_lock();

	/* receive list for 'all' CAN devices (dev == NULL) */
	d = net->can.can_rx_alldev_list;
	can_rcvlist_proc_show_one(m, idx, NULL, d);

	/* receive list for registered CAN devices */
	for_each_netdev_rcu(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 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 can_dev_rcv_lists *d;
	struct net *net = m->private;

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

	rcu_read_lock();

	/* sff receive list for 'all' CAN devices (dev == NULL) */
	d = net->can.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(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_eff_proc_show(struct seq_file *m, void *v)
{
	struct net_device *dev;
	struct can_dev_rcv_lists *d;
	struct net *net = m->private;

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

	rcu_read_lock();

	/* eff receive list for 'all' CAN devices (dev == NULL) */
	d = net->can.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(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;
}

/*
 * can_init_proc - create main CAN proc directory and procfs entries
 */
void can_init_proc(struct net *net)
{
	/* create /proc/net/can directory */
	net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);

	if (!net->can.proc_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 */
	net->can.pde_version = proc_create_net_single(CAN_PROC_VERSION, 0644,
			net->can.proc_dir, can_version_proc_show, NULL);
	net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644,
			net->can.proc_dir, can_stats_proc_show, NULL);
	net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS,
			0644, net->can.proc_dir, can_reset_stats_proc_show,
			NULL);
	net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR,
			0644, net->can.proc_dir, can_rcvlist_proc_show,
			(void *)RX_ERR);
	net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL,
			0644, net->can.proc_dir, can_rcvlist_proc_show,
			(void *)RX_ALL);
	net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL,
			0644, net->can.proc_dir, can_rcvlist_proc_show,
			(void *)RX_FIL);
	net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV,
			0644, net->can.proc_dir, can_rcvlist_proc_show,
			(void *)RX_INV);
	net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF,
			0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL);
	net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF,
			0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL);
}

/*
 * can_remove_proc - remove procfs entries and main CAN proc directory
 */
void can_remove_proc(struct net *net)
{
	if (net->can.pde_version)
		remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);

	if (net->can.pde_stats)
		remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);

	if (net->can.pde_reset_stats)
		remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);

	if (net->can.pde_rcvlist_err)
		remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);

	if (net->can.pde_rcvlist_all)
		remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);

	if (net->can.pde_rcvlist_fil)
		remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);

	if (net->can.pde_rcvlist_inv)
		remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);

	if (net->can.pde_rcvlist_eff)
		remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);

	if (net->can.pde_rcvlist_sff)
		remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);

	if (net->can.proc_dir)
		remove_proc_entry("can", 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
0d66548a OH	65	static int user_reset;
	66
	67	static const char rx_list_name[][8] = {
	68	[RX_ERR] = "rx_err",
	69	[RX_ALL] = "rx_all",
	70	[RX_FIL] = "rx_fil",
	71	[RX_INV] = "rx_inv",
0d66548a OH	72	};
	73
	74	/*
	75	* af_can statistics stuff
	76	*/
	77
cb5635a3	78	static void can_init_stats(struct net *net)
0d66548a	79	{
cb5635a3 OH	80	struct s_stats *can_stats = net->can.can_stats;
cb5635a3 OH	81	struct s_pstats *can_pstats = net->can.can_pstats;
0d66548a OH	82	/*
	83	* This memset function is called from a timer context (when
	84	* can_stattimer is active which is the default) OR in a process
	85	* context (reading the proc_fs when can_stattimer is disabled).
	86	*/
cb5635a3 OH	87	memset(can_stats, 0, sizeof(struct s_stats));
cb5635a3 OH	88	can_stats->jiffies_init = jiffies;
0d66548a	89
cb5635a3	90	can_pstats->stats_reset++;
0d66548a OH	91
	92	if (user_reset) {
	93	user_reset = 0;
cb5635a3	94	can_pstats->user_reset++;
0d66548a OH	95	}
	96	}
	97
	98	static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
	99	unsigned long count)
	100	{
	101	unsigned long rate;
	102
	103	if (oldjif == newjif)
	104	return 0;
	105
	106	/* see can_stat_update() - this should NEVER happen! */
	107	if (count > (ULONG_MAX / HZ)) {
	108	printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
	109	count);
	110	return 99999999;
	111	}
	112
	113	rate = (count * HZ) / (newjif - oldjif);
	114
	115	return rate;
	116	}
	117
1fccb565	118	void can_stat_update(struct timer_list *t)
0d66548a	119	{
1fccb565	120	struct net *net = from_timer(net, t, can.can_stattimer);
cb5635a3	121	struct s_stats *can_stats = net->can.can_stats;
0d66548a OH	122	unsigned long j = jiffies; /* snapshot */
	123
	124	/* restart counting in timer context on user request */
	125	if (user_reset)
cb5635a3	126	can_init_stats(net);
0d66548a OH	127
0d66548a OH	128	/* restart counting on jiffies overflow */
cb5635a3 OH	129	if (j < can_stats->jiffies_init)
cb5635a3 OH	130	can_init_stats(net);
0d66548a OH	131
0d66548a OH	132	/* prevent overflow in calc_rate() */
cb5635a3 OH	133	if (can_stats->rx_frames > (ULONG_MAX / HZ))
cb5635a3 OH	134	can_init_stats(net);
0d66548a OH	135
0d66548a OH	136	/* prevent overflow in calc_rate() */
cb5635a3 OH	137	if (can_stats->tx_frames > (ULONG_MAX / HZ))
cb5635a3 OH	138	can_init_stats(net);
0d66548a OH	139
0d66548a OH	140	/* matches overflow - very improbable */
cb5635a3 OH	141	if (can_stats->matches > (ULONG_MAX / 100))
cb5635a3 OH	142	can_init_stats(net);
0d66548a OH	143
0d66548a OH	144	/* calc total values */
cb5635a3 OH	145	if (can_stats->rx_frames)
	146	can_stats->total_rx_match_ratio = (can_stats->matches * 100) /
	147	can_stats->rx_frames;
0d66548a	148
cb5635a3 OH	149	can_stats->total_tx_rate = calc_rate(can_stats->jiffies_init, j,
	150	can_stats->tx_frames);
	151	can_stats->total_rx_rate = calc_rate(can_stats->jiffies_init, j,
	152	can_stats->rx_frames);
0d66548a OH	153
0d66548a OH	154	/* calc current values */
cb5635a3 OH	155	if (can_stats->rx_frames_delta)
	156	can_stats->current_rx_match_ratio =
	157	(can_stats->matches_delta * 100) /
	158	can_stats->rx_frames_delta;
0d66548a	159
cb5635a3 OH	160	can_stats->current_tx_rate = calc_rate(0, HZ, can_stats->tx_frames_delta);
cb5635a3 OH	161	can_stats->current_rx_rate = calc_rate(0, HZ, can_stats->rx_frames_delta);
0d66548a OH	162
0d66548a OH	163	/* check / update maximum values */
cb5635a3 OH	164	if (can_stats->max_tx_rate < can_stats->current_tx_rate)
cb5635a3 OH	165	can_stats->max_tx_rate = can_stats->current_tx_rate;
0d66548a	166
cb5635a3 OH	167	if (can_stats->max_rx_rate < can_stats->current_rx_rate)
cb5635a3 OH	168	can_stats->max_rx_rate = can_stats->current_rx_rate;
0d66548a	169
cb5635a3 OH	170	if (can_stats->max_rx_match_ratio < can_stats->current_rx_match_ratio)
cb5635a3 OH	171	can_stats->max_rx_match_ratio = can_stats->current_rx_match_ratio;
0d66548a OH	172
0d66548a OH	173	/* clear values for 'current rate' calculation */
cb5635a3 OH	174	can_stats->tx_frames_delta = 0;
	175	can_stats->rx_frames_delta = 0;
	176	can_stats->matches_delta = 0;
0d66548a OH	177
0d66548a OH	178	/* restart timer (one second) */
cb5635a3	179	mod_timer(&net->can.can_stattimer, round_jiffies(jiffies + HZ));
0d66548a OH	180	}
	181
	182	/*
	183	* proc read functions
0d66548a OH	184	*/
0d66548a OH	185
ea00b8e2 AD	186	static void can_print_rcvlist(struct seq_file m, struct hlist_head rx_list,
ea00b8e2 AD	187	struct net_device *dev)
0d66548a OH	188	{
0d66548a OH	189	struct receiver *r;
0d66548a	190
b67bfe0d	191	hlist_for_each_entry_rcu(r, rx_list, list) {
0d66548a	192	char *fmt = (r->can_id & CAN_EFF_FLAG)?
12e6c419 OH	193	" %-5s %08x %08x %pK %pK %8ld %s\n" :
12e6c419 OH	194	" %-5s %03x %08x %pK %pK %8ld %s\n";
0d66548a	195
ea00b8e2	196	seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
12e6c419	197	r->func, r->data, r->matches, r->ident);
0d66548a	198	}
0d66548a OH	199	}
0d66548a OH	200
ea00b8e2	201	static void can_print_recv_banner(struct seq_file *m)
0d66548a OH	202	{
	203	/*
	204	* can1. 00000000 00000000 00000000
	205	* ....... 0 tp20
	206	*/
ea00b8e2	207	seq_puts(m, " device can_id can_mask function"
0d66548a	208	" userdata matches ident\n");
0d66548a OH	209	}
0d66548a OH	210
ea00b8e2	211	static int can_stats_proc_show(struct seq_file m, void v)
0d66548a	212	{
cb5635a3 OH	213	struct net *net = m->private;
	214	struct s_stats *can_stats = net->can.can_stats;
	215	struct s_pstats *can_pstats = net->can.can_pstats;
	216
ea00b8e2	217	seq_putc(m, '\n');
cb5635a3 OH	218	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats->tx_frames);
	219	seq_printf(m, " %8ld received frames (RXF)\n", can_stats->rx_frames);
	220	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats->matches);
0d66548a	221
ea00b8e2	222	seq_putc(m, '\n');
0d66548a	223
841b86f3	224	if (net->can.can_stattimer.function == can_stat_update) {
ea00b8e2	225	seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
cb5635a3	226	can_stats->total_rx_match_ratio);
0d66548a	227
ea00b8e2	228	seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
cb5635a3	229	can_stats->total_tx_rate);
ea00b8e2	230	seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
cb5635a3	231	can_stats->total_rx_rate);
0d66548a	232
ea00b8e2	233	seq_putc(m, '\n');
0d66548a	234
ea00b8e2	235	seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
cb5635a3	236	can_stats->current_rx_match_ratio);
0d66548a	237
ea00b8e2	238	seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
cb5635a3	239	can_stats->current_tx_rate);
ea00b8e2	240	seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
cb5635a3	241	can_stats->current_rx_rate);
0d66548a	242
ea00b8e2	243	seq_putc(m, '\n');
0d66548a	244
ea00b8e2	245	seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
cb5635a3	246	can_stats->max_rx_match_ratio);
0d66548a	247
ea00b8e2	248	seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
cb5635a3	249	can_stats->max_tx_rate);
ea00b8e2	250	seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
cb5635a3	251	can_stats->max_rx_rate);
0d66548a	252
ea00b8e2	253	seq_putc(m, '\n');
0d66548a OH	254	}
0d66548a OH	255
ea00b8e2	256	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
cb5635a3	257	can_pstats->rcv_entries);
ea00b8e2	258	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
cb5635a3	259	can_pstats->rcv_entries_max);
0d66548a	260
cb5635a3	261	if (can_pstats->stats_reset)
ea00b8e2	262	seq_printf(m, "\n %8ld statistic resets (STR)\n",
cb5635a3	263	can_pstats->stats_reset);
0d66548a	264
cb5635a3	265	if (can_pstats->user_reset)
ea00b8e2	266	seq_printf(m, " %8ld user statistic resets (USTR)\n",
cb5635a3	267	can_pstats->user_reset);
0d66548a	268
ea00b8e2 AD	269	seq_putc(m, '\n');
ea00b8e2 AD	270	return 0;
0d66548a OH	271	}
0d66548a OH	272
ea00b8e2 AD	273	static int can_reset_stats_proc_show(struct seq_file m, void v)
ea00b8e2 AD	274	{
cb5635a3 OH	275	struct net *net = m->private;
	276	struct s_pstats *can_pstats = net->can.can_pstats;
	277	struct s_stats *can_stats = net->can.can_stats;
	278
0d66548a OH	279	user_reset = 1;
0d66548a OH	280
841b86f3	281	if (net->can.can_stattimer.function == can_stat_update) {
ea00b8e2	282	seq_printf(m, "Scheduled statistic reset #%ld.\n",
cb5635a3	283	can_pstats->stats_reset + 1);
0d66548a	284	} else {
cb5635a3 OH	285	if (can_stats->jiffies_init != jiffies)
cb5635a3 OH	286	can_init_stats(net);
0d66548a	287
ea00b8e2	288	seq_printf(m, "Performed statistic reset #%ld.\n",
cb5635a3	289	can_pstats->stats_reset);
0d66548a	290	}
ea00b8e2 AD	291	return 0;
ea00b8e2 AD	292	}
0d66548a	293
ea00b8e2	294	static int can_version_proc_show(struct seq_file m, void v)
0d66548a	295	{
ea00b8e2 AD	296	seq_printf(m, "%s\n", CAN_VERSION_STRING);
	297	return 0;
	298	}
0d66548a	299
20dd3850 OH	300	static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
20dd3850 OH	301	struct net_device *dev,
ff847ee4	302	struct can_dev_rcv_lists *d)
20dd3850 OH	303	{
	304	if (!hlist_empty(&d->rx[idx])) {
	305	can_print_recv_banner(m);
	306	can_print_rcvlist(m, &d->rx[idx], dev);
	307	} else
	308	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	309
	310	}
	311
ea00b8e2	312	static int can_rcvlist_proc_show(struct seq_file m, void v)
0d66548a OH	313	{
0d66548a OH	314	/* double cast to prevent GCC warning */
8e8cda6d	315	int idx = (int)(long)PDE_DATA(m->file->f_inode);
20dd3850	316	struct net_device *dev;
ff847ee4	317	struct can_dev_rcv_lists *d;
8e8cda6d	318	struct net *net = m->private;
0d66548a	319
ea00b8e2	320	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
0d66548a OH	321
0d66548a OH	322	rcu_read_lock();
0d66548a	323
20dd3850	324	/* receive list for 'all' CAN devices (dev == NULL) */
8e8cda6d	325	d = net->can.can_rx_alldev_list;
20dd3850 OH	326	can_rcvlist_proc_show_one(m, idx, NULL, d);
	327
	328	/* receive list for registered CAN devices */
8e8cda6d	329	for_each_netdev_rcu(net, dev) {
20dd3850 OH	330	if (dev->type == ARPHRD_CAN && dev->ml_priv)
20dd3850 OH	331	can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
0d66548a	332	}
20dd3850	333
0d66548a OH	334	rcu_read_unlock();
0d66548a OH	335
ea00b8e2 AD	336	seq_putc(m, '\n');
	337	return 0;
	338	}
0d66548a	339
e3d3917f OH	340	static inline void can_rcvlist_proc_show_array(struct seq_file *m,
	341	struct net_device *dev,
	342	struct hlist_head *rcv_array,
	343	unsigned int rcv_array_sz)
20dd3850	344	{
e3d3917f	345	unsigned int i;
20dd3850 OH	346	int all_empty = 1;
20dd3850 OH	347
48fc7f7e	348	/* check whether at least one list is non-empty */
e3d3917f OH	349	for (i = 0; i < rcv_array_sz; i++)
e3d3917f OH	350	if (!hlist_empty(&rcv_array[i])) {
20dd3850 OH	351	all_empty = 0;
	352	break;
	353	}
	354
	355	if (!all_empty) {
	356	can_print_recv_banner(m);
e3d3917f OH	357	for (i = 0; i < rcv_array_sz; i++) {
	358	if (!hlist_empty(&rcv_array[i]))
	359	can_print_rcvlist(m, &rcv_array[i], dev);
20dd3850 OH	360	}
	361	} else
	362	seq_printf(m, " (%s: no entry)\n", DNAME(dev));
	363	}
	364
ea00b8e2	365	static int can_rcvlist_sff_proc_show(struct seq_file m, void v)
0d66548a	366	{
20dd3850	367	struct net_device *dev;
ff847ee4	368	struct can_dev_rcv_lists *d;
8e8cda6d	369	struct net *net = m->private;
0d66548a OH	370
0d66548a OH	371	/* RX_SFF */
ea00b8e2	372	seq_puts(m, "\nreceive list 'rx_sff':\n");
0d66548a OH	373
0d66548a OH	374	rcu_read_lock();
20dd3850 OH	375
20dd3850 OH	376	/* sff receive list for 'all' CAN devices (dev == NULL) */
8e8cda6d	377	d = net->can.can_rx_alldev_list;
e3d3917f	378	can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
20dd3850 OH	379
20dd3850 OH	380	/* sff receive list for registered CAN devices */
8e8cda6d	381	for_each_netdev_rcu(net, dev) {
e3d3917f OH	382	if (dev->type == ARPHRD_CAN && dev->ml_priv) {
	383	d = dev->ml_priv;
	384	can_rcvlist_proc_show_array(m, dev, d->rx_sff,
	385	ARRAY_SIZE(d->rx_sff));
	386	}
0d66548a	387	}
20dd3850	388
0d66548a OH	389	rcu_read_unlock();
0d66548a OH	390
ea00b8e2 AD	391	seq_putc(m, '\n');
	392	return 0;
	393	}
0d66548a	394
45c70029 OH	395	static int can_rcvlist_eff_proc_show(struct seq_file m, void v)
	396	{
	397	struct net_device *dev;
ff847ee4	398	struct can_dev_rcv_lists *d;
8e8cda6d	399	struct net *net = m->private;
45c70029 OH	400
	401	/* RX_EFF */
	402	seq_puts(m, "\nreceive list 'rx_eff':\n");
	403
	404	rcu_read_lock();
	405
	406	/* eff receive list for 'all' CAN devices (dev == NULL) */
8e8cda6d	407	d = net->can.can_rx_alldev_list;
45c70029 OH	408	can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
	409
	410	/* eff receive list for registered CAN devices */
8e8cda6d	411	for_each_netdev_rcu(net, dev) {
45c70029 OH	412	if (dev->type == ARPHRD_CAN && dev->ml_priv) {
	413	d = dev->ml_priv;
	414	can_rcvlist_proc_show_array(m, dev, d->rx_eff,
	415	ARRAY_SIZE(d->rx_eff));
	416	}
	417	}
	418
	419	rcu_read_unlock();
	420
	421	seq_putc(m, '\n');
	422	return 0;
	423	}
	424
0d66548a OH	425	/*
	426	* can_init_proc - create main CAN proc directory and procfs entries
	427	*/
8e8cda6d	428	void can_init_proc(struct net *net)
0d66548a OH	429	{
0d66548a OH	430	/* create /proc/net/can directory */
8e8cda6d	431	net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
0d66548a	432
8e8cda6d MK	433	if (!net->can.proc_dir) {
	434	printk(KERN_INFO "can: failed to create /proc/net/can . "
	435	"CONFIG_PROC_FS missing?\n");
0d66548a OH	436	return;
	437	}
	438
0d66548a	439	/* own procfs entries from the AF_CAN core */
3617d949 CH	440	net->can.pde_version = proc_create_net_single(CAN_PROC_VERSION, 0644,
	441	net->can.proc_dir, can_version_proc_show, NULL);
	442	net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644,
	443	net->can.proc_dir, can_stats_proc_show, NULL);
	444	net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS,
	445	0644, net->can.proc_dir, can_reset_stats_proc_show,
	446	NULL);
	447	net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR,
	448	0644, net->can.proc_dir, can_rcvlist_proc_show,
	449	(void *)RX_ERR);
	450	net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL,
	451	0644, net->can.proc_dir, can_rcvlist_proc_show,
	452	(void *)RX_ALL);
	453	net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL,
	454	0644, net->can.proc_dir, can_rcvlist_proc_show,
	455	(void *)RX_FIL);
	456	net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV,
	457	0644, net->can.proc_dir, can_rcvlist_proc_show,
	458	(void *)RX_INV);
	459	net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF,
	460	0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL);
	461	net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF,
	462	0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL);
0d66548a OH	463	}
	464
	465	/*
	466	* can_remove_proc - remove procfs entries and main CAN proc directory
	467	*/
8e8cda6d	468	void can_remove_proc(struct net *net)
0d66548a	469	{
8e8cda6d MK	470	if (net->can.pde_version)
8e8cda6d MK	471	remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
0d66548a	472
8e8cda6d MK	473	if (net->can.pde_stats)
8e8cda6d MK	474	remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
0d66548a	475
8e8cda6d MK	476	if (net->can.pde_reset_stats)
8e8cda6d MK	477	remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
0d66548a	478
8e8cda6d MK	479	if (net->can.pde_rcvlist_err)
8e8cda6d MK	480	remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
0d66548a	481
8e8cda6d MK	482	if (net->can.pde_rcvlist_all)
8e8cda6d MK	483	remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
0d66548a	484
8e8cda6d MK	485	if (net->can.pde_rcvlist_fil)
8e8cda6d MK	486	remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
0d66548a	487
8e8cda6d MK	488	if (net->can.pde_rcvlist_inv)
8e8cda6d MK	489	remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
0d66548a	490
8e8cda6d MK	491	if (net->can.pde_rcvlist_eff)
8e8cda6d MK	492	remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
0d66548a	493
8e8cda6d MK	494	if (net->can.pde_rcvlist_sff)
8e8cda6d MK	495	remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
0d66548a	496
8e8cda6d MK	497	if (net->can.proc_dir)
8e8cda6d MK	498	remove_proc_entry("can", net->proc_net);
0d66548a	499	}