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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/if_arp.h>
49#include <linux/can/core.h>
50
51#include "af_can.h"
52
53/*
54 * proc filenames for the PF_CAN core
55 */
56
57#define CAN_PROC_VERSION "version"
58#define CAN_PROC_STATS "stats"
59#define CAN_PROC_RESET_STATS "reset_stats"
60#define CAN_PROC_RCVLIST_ALL "rcvlist_all"
61#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
62#define CAN_PROC_RCVLIST_INV "rcvlist_inv"
63#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
64#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
65#define CAN_PROC_RCVLIST_ERR "rcvlist_err"
66
67static struct proc_dir_entry *can_dir;
68static struct proc_dir_entry *pde_version;
69static struct proc_dir_entry *pde_stats;
70static struct proc_dir_entry *pde_reset_stats;
71static struct proc_dir_entry *pde_rcvlist_all;
72static struct proc_dir_entry *pde_rcvlist_fil;
73static struct proc_dir_entry *pde_rcvlist_inv;
74static struct proc_dir_entry *pde_rcvlist_sff;
75static struct proc_dir_entry *pde_rcvlist_eff;
76static struct proc_dir_entry *pde_rcvlist_err;
77
78static int user_reset;
79
80static const char rx_list_name[][8] = {
81 [RX_ERR] = "rx_err",
82 [RX_ALL] = "rx_all",
83 [RX_FIL] = "rx_fil",
84 [RX_INV] = "rx_inv",
85 [RX_EFF] = "rx_eff",
86};
87
88/* receive filters subscribed for 'all' CAN devices */
89extern struct dev_rcv_lists can_rx_alldev_list;
90
91/*
92 * af_can statistics stuff
93 */
94
95static void can_init_stats(void)
96{
97 /*
98 * This memset function is called from a timer context (when
99 * can_stattimer is active which is the default) OR in a process
100 * context (reading the proc_fs when can_stattimer is disabled).
101 */
102 memset(&can_stats, 0, sizeof(can_stats));
103 can_stats.jiffies_init = jiffies;
104
105 can_pstats.stats_reset++;
106
107 if (user_reset) {
108 user_reset = 0;
109 can_pstats.user_reset++;
110 }
111}
112
113static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
114 unsigned long count)
115{
116 unsigned long rate;
117
118 if (oldjif == newjif)
119 return 0;
120
121 /* see can_stat_update() - this should NEVER happen! */
122 if (count > (ULONG_MAX / HZ)) {
123 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
124 count);
125 return 99999999;
126 }
127
128 rate = (count * HZ) / (newjif - oldjif);
129
130 return rate;
131}
132
133void can_stat_update(unsigned long data)
134{
135 unsigned long j = jiffies; /* snapshot */
136
137 /* restart counting in timer context on user request */
138 if (user_reset)
139 can_init_stats();
140
141 /* restart counting on jiffies overflow */
142 if (j < can_stats.jiffies_init)
143 can_init_stats();
144
145 /* prevent overflow in calc_rate() */
146 if (can_stats.rx_frames > (ULONG_MAX / HZ))
147 can_init_stats();
148
149 /* prevent overflow in calc_rate() */
150 if (can_stats.tx_frames > (ULONG_MAX / HZ))
151 can_init_stats();
152
153 /* matches overflow - very improbable */
154 if (can_stats.matches > (ULONG_MAX / 100))
155 can_init_stats();
156
157 /* calc total values */
158 if (can_stats.rx_frames)
159 can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
160 can_stats.rx_frames;
161
162 can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
163 can_stats.tx_frames);
164 can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
165 can_stats.rx_frames);
166
167 /* calc current values */
168 if (can_stats.rx_frames_delta)
169 can_stats.current_rx_match_ratio =
170 (can_stats.matches_delta * 100) /
171 can_stats.rx_frames_delta;
172
173 can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
174 can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
175
176 /* check / update maximum values */
177 if (can_stats.max_tx_rate < can_stats.current_tx_rate)
178 can_stats.max_tx_rate = can_stats.current_tx_rate;
179
180 if (can_stats.max_rx_rate < can_stats.current_rx_rate)
181 can_stats.max_rx_rate = can_stats.current_rx_rate;
182
183 if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
184 can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
185
186 /* clear values for 'current rate' calculation */
187 can_stats.tx_frames_delta = 0;
188 can_stats.rx_frames_delta = 0;
189 can_stats.matches_delta = 0;
190
191 /* restart timer (one second) */
192 mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
193}
194
195/*
196 * proc read functions
197 */
198
199static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
200 struct net_device *dev)
201{
202 struct receiver *r;
203 struct hlist_node *n;
204
205 hlist_for_each_entry_rcu(r, n, rx_list, list) {
206 char *fmt = (r->can_id & CAN_EFF_FLAG)?
207 " %-5s %08x %08x %pK %pK %8ld %s\n" :
208 " %-5s %03x %08x %pK %pK %8ld %s\n";
209
210 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
211 r->func, r->data, r->matches, r->ident);
212 }
213}
214
215static void can_print_recv_banner(struct seq_file *m)
216{
217 /*
218 * can1. 00000000 00000000 00000000
219 * ....... 0 tp20
220 */
221 seq_puts(m, " device can_id can_mask function"
222 " userdata matches ident\n");
223}
224
225static int can_stats_proc_show(struct seq_file *m, void *v)
226{
227 seq_putc(m, '\n');
228 seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
229 seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
230 seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
231
232 seq_putc(m, '\n');
233
234 if (can_stattimer.function == can_stat_update) {
235 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
236 can_stats.total_rx_match_ratio);
237
238 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
239 can_stats.total_tx_rate);
240 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
241 can_stats.total_rx_rate);
242
243 seq_putc(m, '\n');
244
245 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
246 can_stats.current_rx_match_ratio);
247
248 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
249 can_stats.current_tx_rate);
250 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
251 can_stats.current_rx_rate);
252
253 seq_putc(m, '\n');
254
255 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
256 can_stats.max_rx_match_ratio);
257
258 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
259 can_stats.max_tx_rate);
260 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
261 can_stats.max_rx_rate);
262
263 seq_putc(m, '\n');
264 }
265
266 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
267 can_pstats.rcv_entries);
268 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
269 can_pstats.rcv_entries_max);
270
271 if (can_pstats.stats_reset)
272 seq_printf(m, "\n %8ld statistic resets (STR)\n",
273 can_pstats.stats_reset);
274
275 if (can_pstats.user_reset)
276 seq_printf(m, " %8ld user statistic resets (USTR)\n",
277 can_pstats.user_reset);
278
279 seq_putc(m, '\n');
280 return 0;
281}
282
283static int can_stats_proc_open(struct inode *inode, struct file *file)
284{
285 return single_open(file, can_stats_proc_show, NULL);
286}
287
288static const struct file_operations can_stats_proc_fops = {
289 .owner = THIS_MODULE,
290 .open = can_stats_proc_open,
291 .read = seq_read,
292 .llseek = seq_lseek,
293 .release = single_release,
294};
295
296static int can_reset_stats_proc_show(struct seq_file *m, void *v)
297{
298 user_reset = 1;
299
300 if (can_stattimer.function == can_stat_update) {
301 seq_printf(m, "Scheduled statistic reset #%ld.\n",
302 can_pstats.stats_reset + 1);
303
304 } else {
305 if (can_stats.jiffies_init != jiffies)
306 can_init_stats();
307
308 seq_printf(m, "Performed statistic reset #%ld.\n",
309 can_pstats.stats_reset);
310 }
311 return 0;
312}
313
314static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
315{
316 return single_open(file, can_reset_stats_proc_show, NULL);
317}
318
319static const struct file_operations can_reset_stats_proc_fops = {
320 .owner = THIS_MODULE,
321 .open = can_reset_stats_proc_open,
322 .read = seq_read,
323 .llseek = seq_lseek,
324 .release = single_release,
325};
326
327static int can_version_proc_show(struct seq_file *m, void *v)
328{
329 seq_printf(m, "%s\n", CAN_VERSION_STRING);
330 return 0;
331}
332
333static int can_version_proc_open(struct inode *inode, struct file *file)
334{
335 return single_open(file, can_version_proc_show, NULL);
336}
337
338static const struct file_operations can_version_proc_fops = {
339 .owner = THIS_MODULE,
340 .open = can_version_proc_open,
341 .read = seq_read,
342 .llseek = seq_lseek,
343 .release = single_release,
344};
345
346static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
347 struct net_device *dev,
348 struct dev_rcv_lists *d)
349{
350 if (!hlist_empty(&d->rx[idx])) {
351 can_print_recv_banner(m);
352 can_print_rcvlist(m, &d->rx[idx], dev);
353 } else
354 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
355
356}
357
358static int can_rcvlist_proc_show(struct seq_file *m, void *v)
359{
360 /* double cast to prevent GCC warning */
361 int idx = (int)(long)m->private;
362 struct net_device *dev;
363 struct dev_rcv_lists *d;
364
365 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
366
367 rcu_read_lock();
368
369 /* receive list for 'all' CAN devices (dev == NULL) */
370 d = &can_rx_alldev_list;
371 can_rcvlist_proc_show_one(m, idx, NULL, d);
372
373 /* receive list for registered CAN devices */
374 for_each_netdev_rcu(&init_net, dev) {
375 if (dev->type == ARPHRD_CAN && dev->ml_priv)
376 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
377 }
378
379 rcu_read_unlock();
380
381 seq_putc(m, '\n');
382 return 0;
383}
384
385static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
386{
387 return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
388}
389
390static const struct file_operations can_rcvlist_proc_fops = {
391 .owner = THIS_MODULE,
392 .open = can_rcvlist_proc_open,
393 .read = seq_read,
394 .llseek = seq_lseek,
395 .release = single_release,
396};
397
398static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
399 struct net_device *dev,
400 struct dev_rcv_lists *d)
401{
402 int i;
403 int all_empty = 1;
404
405 /* check wether at least one list is non-empty */
406 for (i = 0; i < 0x800; i++)
407 if (!hlist_empty(&d->rx_sff[i])) {
408 all_empty = 0;
409 break;
410 }
411
412 if (!all_empty) {
413 can_print_recv_banner(m);
414 for (i = 0; i < 0x800; i++) {
415 if (!hlist_empty(&d->rx_sff[i]))
416 can_print_rcvlist(m, &d->rx_sff[i], dev);
417 }
418 } else
419 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
420}
421
422static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
423{
424 struct net_device *dev;
425 struct dev_rcv_lists *d;
426
427 /* RX_SFF */
428 seq_puts(m, "\nreceive list 'rx_sff':\n");
429
430 rcu_read_lock();
431
432 /* sff receive list for 'all' CAN devices (dev == NULL) */
433 d = &can_rx_alldev_list;
434 can_rcvlist_sff_proc_show_one(m, NULL, d);
435
436 /* sff receive list for registered CAN devices */
437 for_each_netdev_rcu(&init_net, dev) {
438 if (dev->type == ARPHRD_CAN && dev->ml_priv)
439 can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
440 }
441
442 rcu_read_unlock();
443
444 seq_putc(m, '\n');
445 return 0;
446}
447
448static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
449{
450 return single_open(file, can_rcvlist_sff_proc_show, NULL);
451}
452
453static const struct file_operations can_rcvlist_sff_proc_fops = {
454 .owner = THIS_MODULE,
455 .open = can_rcvlist_sff_proc_open,
456 .read = seq_read,
457 .llseek = seq_lseek,
458 .release = single_release,
459};
460
461/*
462 * proc utility functions
463 */
464
465static void can_remove_proc_readentry(const char *name)
466{
467 if (can_dir)
468 remove_proc_entry(name, can_dir);
469}
470
471/*
472 * can_init_proc - create main CAN proc directory and procfs entries
473 */
474void can_init_proc(void)
475{
476 /* create /proc/net/can directory */
477 can_dir = proc_mkdir("can", init_net.proc_net);
478
479 if (!can_dir) {
480 printk(KERN_INFO "can: failed to create /proc/net/can . "
481 "CONFIG_PROC_FS missing?\n");
482 return;
483 }
484
485 /* own procfs entries from the AF_CAN core */
486 pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
487 &can_version_proc_fops);
488 pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
489 &can_stats_proc_fops);
490 pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
491 &can_reset_stats_proc_fops);
492 pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
493 &can_rcvlist_proc_fops, (void *)RX_ERR);
494 pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
495 &can_rcvlist_proc_fops, (void *)RX_ALL);
496 pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
497 &can_rcvlist_proc_fops, (void *)RX_FIL);
498 pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
499 &can_rcvlist_proc_fops, (void *)RX_INV);
500 pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
501 &can_rcvlist_proc_fops, (void *)RX_EFF);
502 pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
503 &can_rcvlist_sff_proc_fops);
504}
505
506/*
507 * can_remove_proc - remove procfs entries and main CAN proc directory
508 */
509void can_remove_proc(void)
510{
511 if (pde_version)
512 can_remove_proc_readentry(CAN_PROC_VERSION);
513
514 if (pde_stats)
515 can_remove_proc_readentry(CAN_PROC_STATS);
516
517 if (pde_reset_stats)
518 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
519
520 if (pde_rcvlist_err)
521 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
522
523 if (pde_rcvlist_all)
524 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
525
526 if (pde_rcvlist_fil)
527 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
528
529 if (pde_rcvlist_inv)
530 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
531
532 if (pde_rcvlist_eff)
533 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
534
535 if (pde_rcvlist_sff)
536 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
537
538 if (can_dir)
539 proc_net_remove(&init_net, "can");
540}
1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2/*
3 * proc.c - procfs support for Protocol family CAN core module
4 *
5 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of Volkswagen nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * Alternatively, provided that this notice is retained in full, this
21 * software may be distributed under the terms of the GNU General
22 * Public License ("GPL") version 2, in which case the provisions of the
23 * GPL apply INSTEAD OF those given above.
24 *
25 * The provided data structures and external interfaces from this code
26 * are not restricted to be used by modules with a GPL compatible license.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
39 * DAMAGE.
40 *
41 */
42
43#include <linux/module.h>
44#include <linux/proc_fs.h>
45#include <linux/list.h>
46#include <linux/rcupdate.h>
47#include <linux/if_arp.h>
48#include <linux/can/can-ml.h>
49#include <linux/can/core.h>
50
51#include "af_can.h"
52
53/*
54 * proc filenames for the PF_CAN core
55 */
56
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
66static int user_reset;
67
68static const char rx_list_name[][8] = {
69 [RX_ERR] = "rx_err",
70 [RX_ALL] = "rx_all",
71 [RX_FIL] = "rx_fil",
72 [RX_INV] = "rx_inv",
73};
74
75/*
76 * af_can statistics stuff
77 */
78
79static void can_init_stats(struct net *net)
80{
81 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
82 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
83 /*
84 * This memset function is called from a timer context (when
85 * can_stattimer is active which is the default) OR in a process
86 * context (reading the proc_fs when can_stattimer is disabled).
87 */
88 memset(pkg_stats, 0, sizeof(struct can_pkg_stats));
89 pkg_stats->jiffies_init = jiffies;
90
91 rcv_lists_stats->stats_reset++;
92
93 if (user_reset) {
94 user_reset = 0;
95 rcv_lists_stats->user_reset++;
96 }
97}
98
99static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
100 unsigned long count)
101{
102 if (oldjif == newjif)
103 return 0;
104
105 /* see can_stat_update() - this should NEVER happen! */
106 if (count > (ULONG_MAX / HZ)) {
107 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
108 count);
109 return 99999999;
110 }
111
112 return (count * HZ) / (newjif - oldjif);
113}
114
115void can_stat_update(struct timer_list *t)
116{
117 struct net *net = from_timer(net, t, can.stattimer);
118 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
119 unsigned long j = jiffies; /* snapshot */
120
121 /* restart counting in timer context on user request */
122 if (user_reset)
123 can_init_stats(net);
124
125 /* restart counting on jiffies overflow */
126 if (j < pkg_stats->jiffies_init)
127 can_init_stats(net);
128
129 /* prevent overflow in calc_rate() */
130 if (pkg_stats->rx_frames > (ULONG_MAX / HZ))
131 can_init_stats(net);
132
133 /* prevent overflow in calc_rate() */
134 if (pkg_stats->tx_frames > (ULONG_MAX / HZ))
135 can_init_stats(net);
136
137 /* matches overflow - very improbable */
138 if (pkg_stats->matches > (ULONG_MAX / 100))
139 can_init_stats(net);
140
141 /* calc total values */
142 if (pkg_stats->rx_frames)
143 pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) /
144 pkg_stats->rx_frames;
145
146 pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j,
147 pkg_stats->tx_frames);
148 pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j,
149 pkg_stats->rx_frames);
150
151 /* calc current values */
152 if (pkg_stats->rx_frames_delta)
153 pkg_stats->current_rx_match_ratio =
154 (pkg_stats->matches_delta * 100) /
155 pkg_stats->rx_frames_delta;
156
157 pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta);
158 pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta);
159
160 /* check / update maximum values */
161 if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate)
162 pkg_stats->max_tx_rate = pkg_stats->current_tx_rate;
163
164 if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate)
165 pkg_stats->max_rx_rate = pkg_stats->current_rx_rate;
166
167 if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio)
168 pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
169
170 /* clear values for 'current rate' calculation */
171 pkg_stats->tx_frames_delta = 0;
172 pkg_stats->rx_frames_delta = 0;
173 pkg_stats->matches_delta = 0;
174
175 /* restart timer (one second) */
176 mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ));
177}
178
179/*
180 * proc read functions
181 */
182
183static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
184 struct net_device *dev)
185{
186 struct receiver *r;
187
188 hlist_for_each_entry_rcu(r, rx_list, list) {
189 char *fmt = (r->can_id & CAN_EFF_FLAG)?
190 " %-5s %08x %08x %pK %pK %8ld %s\n" :
191 " %-5s %03x %08x %pK %pK %8ld %s\n";
192
193 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
194 r->func, r->data, r->matches, r->ident);
195 }
196}
197
198static void can_print_recv_banner(struct seq_file *m)
199{
200 /*
201 * can1. 00000000 00000000 00000000
202 * ....... 0 tp20
203 */
204 if (IS_ENABLED(CONFIG_64BIT))
205 seq_puts(m, " device can_id can_mask function userdata matches ident\n");
206 else
207 seq_puts(m, " device can_id can_mask function userdata matches ident\n");
208}
209
210static int can_stats_proc_show(struct seq_file *m, void *v)
211{
212 struct net *net = m->private;
213 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
214 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
215
216 seq_putc(m, '\n');
217 seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames);
218 seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames);
219 seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches);
220
221 seq_putc(m, '\n');
222
223 if (net->can.stattimer.function == can_stat_update) {
224 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
225 pkg_stats->total_rx_match_ratio);
226
227 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
228 pkg_stats->total_tx_rate);
229 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
230 pkg_stats->total_rx_rate);
231
232 seq_putc(m, '\n');
233
234 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
235 pkg_stats->current_rx_match_ratio);
236
237 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
238 pkg_stats->current_tx_rate);
239 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
240 pkg_stats->current_rx_rate);
241
242 seq_putc(m, '\n');
243
244 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
245 pkg_stats->max_rx_match_ratio);
246
247 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
248 pkg_stats->max_tx_rate);
249 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
250 pkg_stats->max_rx_rate);
251
252 seq_putc(m, '\n');
253 }
254
255 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
256 rcv_lists_stats->rcv_entries);
257 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
258 rcv_lists_stats->rcv_entries_max);
259
260 if (rcv_lists_stats->stats_reset)
261 seq_printf(m, "\n %8ld statistic resets (STR)\n",
262 rcv_lists_stats->stats_reset);
263
264 if (rcv_lists_stats->user_reset)
265 seq_printf(m, " %8ld user statistic resets (USTR)\n",
266 rcv_lists_stats->user_reset);
267
268 seq_putc(m, '\n');
269 return 0;
270}
271
272static int can_reset_stats_proc_show(struct seq_file *m, void *v)
273{
274 struct net *net = m->private;
275 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
276 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
277
278 user_reset = 1;
279
280 if (net->can.stattimer.function == can_stat_update) {
281 seq_printf(m, "Scheduled statistic reset #%ld.\n",
282 rcv_lists_stats->stats_reset + 1);
283 } else {
284 if (pkg_stats->jiffies_init != jiffies)
285 can_init_stats(net);
286
287 seq_printf(m, "Performed statistic reset #%ld.\n",
288 rcv_lists_stats->stats_reset);
289 }
290 return 0;
291}
292
293static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
294 struct net_device *dev,
295 struct can_dev_rcv_lists *dev_rcv_lists)
296{
297 if (!hlist_empty(&dev_rcv_lists->rx[idx])) {
298 can_print_recv_banner(m);
299 can_print_rcvlist(m, &dev_rcv_lists->rx[idx], dev);
300 } else
301 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
302
303}
304
305static int can_rcvlist_proc_show(struct seq_file *m, void *v)
306{
307 /* double cast to prevent GCC warning */
308 int idx = (int)(long)pde_data(m->file->f_inode);
309 struct net_device *dev;
310 struct can_dev_rcv_lists *dev_rcv_lists;
311 struct net *net = m->private;
312
313 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
314
315 rcu_read_lock();
316
317 /* receive list for 'all' CAN devices (dev == NULL) */
318 dev_rcv_lists = net->can.rx_alldev_list;
319 can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists);
320
321 /* receive list for registered CAN devices */
322 for_each_netdev_rcu(net, dev) {
323 struct can_ml_priv *can_ml = can_get_ml_priv(dev);
324
325 if (can_ml)
326 can_rcvlist_proc_show_one(m, idx, dev,
327 &can_ml->dev_rcv_lists);
328 }
329
330 rcu_read_unlock();
331
332 seq_putc(m, '\n');
333 return 0;
334}
335
336static inline void can_rcvlist_proc_show_array(struct seq_file *m,
337 struct net_device *dev,
338 struct hlist_head *rcv_array,
339 unsigned int rcv_array_sz)
340{
341 unsigned int i;
342 int all_empty = 1;
343
344 /* check whether at least one list is non-empty */
345 for (i = 0; i < rcv_array_sz; i++)
346 if (!hlist_empty(&rcv_array[i])) {
347 all_empty = 0;
348 break;
349 }
350
351 if (!all_empty) {
352 can_print_recv_banner(m);
353 for (i = 0; i < rcv_array_sz; i++) {
354 if (!hlist_empty(&rcv_array[i]))
355 can_print_rcvlist(m, &rcv_array[i], dev);
356 }
357 } else
358 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
359}
360
361static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
362{
363 struct net_device *dev;
364 struct can_dev_rcv_lists *dev_rcv_lists;
365 struct net *net = m->private;
366
367 /* RX_SFF */
368 seq_puts(m, "\nreceive list 'rx_sff':\n");
369
370 rcu_read_lock();
371
372 /* sff receive list for 'all' CAN devices (dev == NULL) */
373 dev_rcv_lists = net->can.rx_alldev_list;
374 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff,
375 ARRAY_SIZE(dev_rcv_lists->rx_sff));
376
377 /* sff receive list for registered CAN devices */
378 for_each_netdev_rcu(net, dev) {
379 struct can_ml_priv *can_ml = can_get_ml_priv(dev);
380
381 if (can_ml) {
382 dev_rcv_lists = &can_ml->dev_rcv_lists;
383 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff,
384 ARRAY_SIZE(dev_rcv_lists->rx_sff));
385 }
386 }
387
388 rcu_read_unlock();
389
390 seq_putc(m, '\n');
391 return 0;
392}
393
394static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
395{
396 struct net_device *dev;
397 struct can_dev_rcv_lists *dev_rcv_lists;
398 struct net *net = m->private;
399
400 /* RX_EFF */
401 seq_puts(m, "\nreceive list 'rx_eff':\n");
402
403 rcu_read_lock();
404
405 /* eff receive list for 'all' CAN devices (dev == NULL) */
406 dev_rcv_lists = net->can.rx_alldev_list;
407 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff,
408 ARRAY_SIZE(dev_rcv_lists->rx_eff));
409
410 /* eff receive list for registered CAN devices */
411 for_each_netdev_rcu(net, dev) {
412 struct can_ml_priv *can_ml = can_get_ml_priv(dev);
413
414 if (can_ml) {
415 dev_rcv_lists = &can_ml->dev_rcv_lists;
416 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_eff,
417 ARRAY_SIZE(dev_rcv_lists->rx_eff));
418 }
419 }
420
421 rcu_read_unlock();
422
423 seq_putc(m, '\n');
424 return 0;
425}
426
427/*
428 * can_init_proc - create main CAN proc directory and procfs entries
429 */
430void can_init_proc(struct net *net)
431{
432 /* create /proc/net/can directory */
433 net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
434
435 if (!net->can.proc_dir) {
436 printk(KERN_INFO "can: failed to create /proc/net/can . "
437 "CONFIG_PROC_FS missing?\n");
438 return;
439 }
440
441 /* own procfs entries from the AF_CAN core */
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);
463}
464
465/*
466 * can_remove_proc - remove procfs entries and main CAN proc directory
467 */
468void can_remove_proc(struct net *net)
469{
470 if (!net->can.proc_dir)
471 return;
472
473 if (net->can.pde_stats)
474 remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
475
476 if (net->can.pde_reset_stats)
477 remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
478
479 if (net->can.pde_rcvlist_err)
480 remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
481
482 if (net->can.pde_rcvlist_all)
483 remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
484
485 if (net->can.pde_rcvlist_fil)
486 remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
487
488 if (net->can.pde_rcvlist_inv)
489 remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
490
491 if (net->can.pde_rcvlist_eff)
492 remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
493
494 if (net->can.pde_rcvlist_sff)
495 remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
496
497 remove_proc_entry("can", net->proc_net);
498}