aboutsummaryrefslogtreecommitdiff
path: root/net/can/proc.c
blob: 550928b8b8a2c988270411ffdad80ab1f5b9dc03 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
 * 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/can-ml.h>
#include <linux/can/core.h>

#include "af_can.h"

/*
 * proc filenames for the PF_CAN core
 */

#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 can_pkg_stats *pkg_stats = net->can.pkg_stats;
	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
	/*
	 * 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(pkg_stats, 0, sizeof(struct can_pkg_stats));
	pkg_stats->jiffies_init = jiffies;

	rcv_lists_stats->stats_reset++;

	if (user_reset) {
		user_reset = 0;
		rcv_lists_stats->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.stattimer);
	struct can_pkg_stats *pkg_stats = net->can.pkg_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 < pkg_stats->jiffies_init)
		can_init_stats(net);

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

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

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

	/* calc total values */
	if (pkg_stats->rx_frames)
		pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) /
			pkg_stats->rx_frames;

	pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j,
					    pkg_stats->tx_frames);
	pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j,
					    pkg_stats->rx_frames);

	/* calc current values */
	if (pkg_stats->rx_frames_delta)
		pkg_stats->current_rx_match_ratio =
			(pkg_stats->matches_delta * 100) /
			pkg_stats->rx_frames_delta;

	pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta);
	pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta);

	/* check / update maximum values */
	if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate)
		pkg_stats->max_tx_rate = pkg_stats->current_tx_rate;

	if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate)
		pkg_stats->max_rx_rate = pkg_stats->current_rx_rate;

	if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio)
		pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;

	/* clear values for 'current rate' calculation */
	pkg_stats->tx_frames_delta = 0;
	pkg_stats->rx_frames_delta = 0;
	pkg_stats->matches_delta   = 0;

	/* restart timer (one second) */
	mod_timer(&net->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 can_pkg_stats *pkg_stats = net->can.pkg_stats;
	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;

	seq_putc(m, '\n');
	seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames);
	seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames);
	seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches);

	seq_putc(m, '\n');

	if (net->can.stattimer.function == can_stat_update) {
		seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
				pkg_stats->total_rx_match_ratio);

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

		seq_putc(m, '\n');

		seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
				pkg_stats->current_rx_match_ratio);

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

		seq_putc(m, '\n');

		seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
				pkg_stats->max_rx_match_ratio);

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

		seq_putc(m, '\n');
	}

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

	if (rcv_lists_stats->stats_reset)
		seq_printf(m, "\n %8ld statistic resets (STR)\n",
				rcv_lists_stats->stats_reset);

	if (rcv_lists_stats->user_reset)
		seq_printf(m, " %8ld user statistic resets (USTR)\n",
				rcv_lists_stats->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 can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
	struct can_pkg_stats *pkg_stats = net->can.pkg_stats;

	user_reset = 1;

	if (net->can.stattimer.function == can_stat_update) {
		seq_printf(m, "Scheduled statistic reset #%ld.\n",
				rcv_lists_stats->stats_reset + 1);
	} else {
		if (pkg_stats->jiffies_init != jiffies)
			can_init_stats(net);

		seq_printf(m, "Performed statistic reset #%ld.\n",
				rcv_lists_stats->stats_reset);
	}
	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 *dev_rcv_lists)
{
	if (!hlist_empty(&dev_rcv_lists->rx[idx])) {
		can_print_recv_banner(m);
		can_print_rcvlist(m, &dev_rcv_lists->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 *dev_rcv_lists;
	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) */
	dev_rcv_lists = net->can.rx_alldev_list;
	can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists);

	/* 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 *dev_rcv_lists;
	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) */
	dev_rcv_lists = net->can.rx_alldev_list;
	can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff,
				    ARRAY_SIZE(dev_rcv_lists->rx_sff));

	/* sff receive list for registered CAN devices */
	for_each_netdev_rcu(net, dev) {
		if (dev->type == ARPHRD_CAN && dev->ml_priv) {
			dev_rcv_lists = dev->ml_priv;
			can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff,
						    ARRAY_SIZE(dev_rcv_lists->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 *dev_rcv_lists;
	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) */
	dev_rcv_lists = net->can.rx_alldev_list;
	can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff,
				    ARRAY_SIZE(dev_rcv_lists->rx_eff));

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