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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 */
41
42#include <linux/module.h>
43#include <linux/proc_fs.h>
44#include <linux/list.h>
45#include <linux/rcupdate.h>
46#include <linux/if_arp.h>
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
65static struct proc_dir_entry *can_dir;
66static struct proc_dir_entry *pde_version;
67static struct proc_dir_entry *pde_stats;
68static struct proc_dir_entry *pde_reset_stats;
69static struct proc_dir_entry *pde_rcvlist_all;
70static struct proc_dir_entry *pde_rcvlist_fil;
71static struct proc_dir_entry *pde_rcvlist_inv;
72static struct proc_dir_entry *pde_rcvlist_sff;
73static struct proc_dir_entry *pde_rcvlist_eff;
74static struct proc_dir_entry *pde_rcvlist_err;
75
76static int user_reset;
77
78static const char rx_list_name[][8] = {
79 [RX_ERR] = "rx_err",
80 [RX_ALL] = "rx_all",
81 [RX_FIL] = "rx_fil",
82 [RX_INV] = "rx_inv",
83 [RX_EFF] = "rx_eff",
84};
85
86/* receive filters subscribed for 'all' CAN devices */
87extern struct dev_rcv_lists can_rx_alldev_list;
88
89/*
90 * af_can statistics stuff
91 */
92
93static void can_init_stats(void)
94{
95 /*
96 * This memset function is called from a timer context (when
97 * can_stattimer is active which is the default) OR in a process
98 * context (reading the proc_fs when can_stattimer is disabled).
99 */
100 memset(&can_stats, 0, sizeof(can_stats));
101 can_stats.jiffies_init = jiffies;
102
103 can_pstats.stats_reset++;
104
105 if (user_reset) {
106 user_reset = 0;
107 can_pstats.user_reset++;
108 }
109}
110
111static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
112 unsigned long count)
113{
114 unsigned long rate;
115
116 if (oldjif == newjif)
117 return 0;
118
119 /* see can_stat_update() - this should NEVER happen! */
120 if (count > (ULONG_MAX / HZ)) {
121 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
122 count);
123 return 99999999;
124 }
125
126 rate = (count * HZ) / (newjif - oldjif);
127
128 return rate;
129}
130
131void can_stat_update(unsigned long data)
132{
133 unsigned long j = jiffies; /* snapshot */
134
135 /* restart counting in timer context on user request */
136 if (user_reset)
137 can_init_stats();
138
139 /* restart counting on jiffies overflow */
140 if (j < can_stats.jiffies_init)
141 can_init_stats();
142
143 /* prevent overflow in calc_rate() */
144 if (can_stats.rx_frames > (ULONG_MAX / HZ))
145 can_init_stats();
146
147 /* prevent overflow in calc_rate() */
148 if (can_stats.tx_frames > (ULONG_MAX / HZ))
149 can_init_stats();
150
151 /* matches overflow - very improbable */
152 if (can_stats.matches > (ULONG_MAX / 100))
153 can_init_stats();
154
155 /* calc total values */
156 if (can_stats.rx_frames)
157 can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
158 can_stats.rx_frames;
159
160 can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
161 can_stats.tx_frames);
162 can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
163 can_stats.rx_frames);
164
165 /* calc current values */
166 if (can_stats.rx_frames_delta)
167 can_stats.current_rx_match_ratio =
168 (can_stats.matches_delta * 100) /
169 can_stats.rx_frames_delta;
170
171 can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
172 can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
173
174 /* check / update maximum values */
175 if (can_stats.max_tx_rate < can_stats.current_tx_rate)
176 can_stats.max_tx_rate = can_stats.current_tx_rate;
177
178 if (can_stats.max_rx_rate < can_stats.current_rx_rate)
179 can_stats.max_rx_rate = can_stats.current_rx_rate;
180
181 if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
182 can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
183
184 /* clear values for 'current rate' calculation */
185 can_stats.tx_frames_delta = 0;
186 can_stats.rx_frames_delta = 0;
187 can_stats.matches_delta = 0;
188
189 /* restart timer (one second) */
190 mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
191}
192
193/*
194 * proc read functions
195 */
196
197static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
198 struct net_device *dev)
199{
200 struct receiver *r;
201 struct hlist_node *n;
202
203 hlist_for_each_entry_rcu(r, n, rx_list, list) {
204 char *fmt = (r->can_id & CAN_EFF_FLAG)?
205 " %-5s %08x %08x %pK %pK %8ld %s\n" :
206 " %-5s %03x %08x %pK %pK %8ld %s\n";
207
208 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
209 r->func, r->data, r->matches, r->ident);
210 }
211}
212
213static void can_print_recv_banner(struct seq_file *m)
214{
215 /*
216 * can1. 00000000 00000000 00000000
217 * ....... 0 tp20
218 */
219 seq_puts(m, " device can_id can_mask function"
220 " userdata matches ident\n");
221}
222
223static int can_stats_proc_show(struct seq_file *m, void *v)
224{
225 seq_putc(m, '\n');
226 seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
227 seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
228 seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
229
230 seq_putc(m, '\n');
231
232 if (can_stattimer.function == can_stat_update) {
233 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
234 can_stats.total_rx_match_ratio);
235
236 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
237 can_stats.total_tx_rate);
238 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
239 can_stats.total_rx_rate);
240
241 seq_putc(m, '\n');
242
243 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
244 can_stats.current_rx_match_ratio);
245
246 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
247 can_stats.current_tx_rate);
248 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
249 can_stats.current_rx_rate);
250
251 seq_putc(m, '\n');
252
253 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
254 can_stats.max_rx_match_ratio);
255
256 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
257 can_stats.max_tx_rate);
258 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
259 can_stats.max_rx_rate);
260
261 seq_putc(m, '\n');
262 }
263
264 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
265 can_pstats.rcv_entries);
266 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
267 can_pstats.rcv_entries_max);
268
269 if (can_pstats.stats_reset)
270 seq_printf(m, "\n %8ld statistic resets (STR)\n",
271 can_pstats.stats_reset);
272
273 if (can_pstats.user_reset)
274 seq_printf(m, " %8ld user statistic resets (USTR)\n",
275 can_pstats.user_reset);
276
277 seq_putc(m, '\n');
278 return 0;
279}
280
281static int can_stats_proc_open(struct inode *inode, struct file *file)
282{
283 return single_open(file, can_stats_proc_show, NULL);
284}
285
286static const struct file_operations can_stats_proc_fops = {
287 .owner = THIS_MODULE,
288 .open = can_stats_proc_open,
289 .read = seq_read,
290 .llseek = seq_lseek,
291 .release = single_release,
292};
293
294static int can_reset_stats_proc_show(struct seq_file *m, void *v)
295{
296 user_reset = 1;
297
298 if (can_stattimer.function == can_stat_update) {
299 seq_printf(m, "Scheduled statistic reset #%ld.\n",
300 can_pstats.stats_reset + 1);
301
302 } else {
303 if (can_stats.jiffies_init != jiffies)
304 can_init_stats();
305
306 seq_printf(m, "Performed statistic reset #%ld.\n",
307 can_pstats.stats_reset);
308 }
309 return 0;
310}
311
312static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
313{
314 return single_open(file, can_reset_stats_proc_show, NULL);
315}
316
317static const struct file_operations can_reset_stats_proc_fops = {
318 .owner = THIS_MODULE,
319 .open = can_reset_stats_proc_open,
320 .read = seq_read,
321 .llseek = seq_lseek,
322 .release = single_release,
323};
324
325static int can_version_proc_show(struct seq_file *m, void *v)
326{
327 seq_printf(m, "%s\n", CAN_VERSION_STRING);
328 return 0;
329}
330
331static int can_version_proc_open(struct inode *inode, struct file *file)
332{
333 return single_open(file, can_version_proc_show, NULL);
334}
335
336static const struct file_operations can_version_proc_fops = {
337 .owner = THIS_MODULE,
338 .open = can_version_proc_open,
339 .read = seq_read,
340 .llseek = seq_lseek,
341 .release = single_release,
342};
343
344static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
345 struct net_device *dev,
346 struct dev_rcv_lists *d)
347{
348 if (!hlist_empty(&d->rx[idx])) {
349 can_print_recv_banner(m);
350 can_print_rcvlist(m, &d->rx[idx], dev);
351 } else
352 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
353
354}
355
356static int can_rcvlist_proc_show(struct seq_file *m, void *v)
357{
358 /* double cast to prevent GCC warning */
359 int idx = (int)(long)m->private;
360 struct net_device *dev;
361 struct dev_rcv_lists *d;
362
363 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
364
365 rcu_read_lock();
366
367 /* receive list for 'all' CAN devices (dev == NULL) */
368 d = &can_rx_alldev_list;
369 can_rcvlist_proc_show_one(m, idx, NULL, d);
370
371 /* receive list for registered CAN devices */
372 for_each_netdev_rcu(&init_net, dev) {
373 if (dev->type == ARPHRD_CAN && dev->ml_priv)
374 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
375 }
376
377 rcu_read_unlock();
378
379 seq_putc(m, '\n');
380 return 0;
381}
382
383static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
384{
385 return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
386}
387
388static const struct file_operations can_rcvlist_proc_fops = {
389 .owner = THIS_MODULE,
390 .open = can_rcvlist_proc_open,
391 .read = seq_read,
392 .llseek = seq_lseek,
393 .release = single_release,
394};
395
396static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
397 struct net_device *dev,
398 struct dev_rcv_lists *d)
399{
400 int i;
401 int all_empty = 1;
402
403 /* check wether at least one list is non-empty */
404 for (i = 0; i < 0x800; i++)
405 if (!hlist_empty(&d->rx_sff[i])) {
406 all_empty = 0;
407 break;
408 }
409
410 if (!all_empty) {
411 can_print_recv_banner(m);
412 for (i = 0; i < 0x800; i++) {
413 if (!hlist_empty(&d->rx_sff[i]))
414 can_print_rcvlist(m, &d->rx_sff[i], dev);
415 }
416 } else
417 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
418}
419
420static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
421{
422 struct net_device *dev;
423 struct dev_rcv_lists *d;
424
425 /* RX_SFF */
426 seq_puts(m, "\nreceive list 'rx_sff':\n");
427
428 rcu_read_lock();
429
430 /* sff receive list for 'all' CAN devices (dev == NULL) */
431 d = &can_rx_alldev_list;
432 can_rcvlist_sff_proc_show_one(m, NULL, d);
433
434 /* sff receive list for registered CAN devices */
435 for_each_netdev_rcu(&init_net, dev) {
436 if (dev->type == ARPHRD_CAN && dev->ml_priv)
437 can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
438 }
439
440 rcu_read_unlock();
441
442 seq_putc(m, '\n');
443 return 0;
444}
445
446static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
447{
448 return single_open(file, can_rcvlist_sff_proc_show, NULL);
449}
450
451static const struct file_operations can_rcvlist_sff_proc_fops = {
452 .owner = THIS_MODULE,
453 .open = can_rcvlist_sff_proc_open,
454 .read = seq_read,
455 .llseek = seq_lseek,
456 .release = single_release,
457};
458
459/*
460 * proc utility functions
461 */
462
463static void can_remove_proc_readentry(const char *name)
464{
465 if (can_dir)
466 remove_proc_entry(name, can_dir);
467}
468
469/*
470 * can_init_proc - create main CAN proc directory and procfs entries
471 */
472void can_init_proc(void)
473{
474 /* create /proc/net/can directory */
475 can_dir = proc_mkdir("can", init_net.proc_net);
476
477 if (!can_dir) {
478 printk(KERN_INFO "can: failed to create /proc/net/can . "
479 "CONFIG_PROC_FS missing?\n");
480 return;
481 }
482
483 /* own procfs entries from the AF_CAN core */
484 pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
485 &can_version_proc_fops);
486 pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
487 &can_stats_proc_fops);
488 pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
489 &can_reset_stats_proc_fops);
490 pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
491 &can_rcvlist_proc_fops, (void *)RX_ERR);
492 pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
493 &can_rcvlist_proc_fops, (void *)RX_ALL);
494 pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
495 &can_rcvlist_proc_fops, (void *)RX_FIL);
496 pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
497 &can_rcvlist_proc_fops, (void *)RX_INV);
498 pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
499 &can_rcvlist_proc_fops, (void *)RX_EFF);
500 pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
501 &can_rcvlist_sff_proc_fops);
502}
503
504/*
505 * can_remove_proc - remove procfs entries and main CAN proc directory
506 */
507void can_remove_proc(void)
508{
509 if (pde_version)
510 can_remove_proc_readentry(CAN_PROC_VERSION);
511
512 if (pde_stats)
513 can_remove_proc_readentry(CAN_PROC_STATS);
514
515 if (pde_reset_stats)
516 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
517
518 if (pde_rcvlist_err)
519 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
520
521 if (pde_rcvlist_all)
522 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
523
524 if (pde_rcvlist_fil)
525 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
526
527 if (pde_rcvlist_inv)
528 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
529
530 if (pde_rcvlist_eff)
531 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
532
533 if (pde_rcvlist_sff)
534 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
535
536 if (can_dir)
537 proc_net_remove(&init_net, "can");
538}
1// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) 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_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 int user_reset;
68
69static const char rx_list_name[][8] = {
70 [RX_ERR] = "rx_err",
71 [RX_ALL] = "rx_all",
72 [RX_FIL] = "rx_fil",
73 [RX_INV] = "rx_inv",
74};
75
76/*
77 * af_can statistics stuff
78 */
79
80static void can_init_stats(struct net *net)
81{
82 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
83 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
84 /*
85 * This memset function is called from a timer context (when
86 * can_stattimer is active which is the default) OR in a process
87 * context (reading the proc_fs when can_stattimer is disabled).
88 */
89 memset(pkg_stats, 0, sizeof(struct can_pkg_stats));
90 pkg_stats->jiffies_init = jiffies;
91
92 rcv_lists_stats->stats_reset++;
93
94 if (user_reset) {
95 user_reset = 0;
96 rcv_lists_stats->user_reset++;
97 }
98}
99
100static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
101 unsigned long count)
102{
103 unsigned long rate;
104
105 if (oldjif == newjif)
106 return 0;
107
108 /* see can_stat_update() - this should NEVER happen! */
109 if (count > (ULONG_MAX / HZ)) {
110 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
111 count);
112 return 99999999;
113 }
114
115 rate = (count * HZ) / (newjif - oldjif);
116
117 return rate;
118}
119
120void can_stat_update(struct timer_list *t)
121{
122 struct net *net = from_timer(net, t, can.stattimer);
123 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
124 unsigned long j = jiffies; /* snapshot */
125
126 /* restart counting in timer context on user request */
127 if (user_reset)
128 can_init_stats(net);
129
130 /* restart counting on jiffies overflow */
131 if (j < pkg_stats->jiffies_init)
132 can_init_stats(net);
133
134 /* prevent overflow in calc_rate() */
135 if (pkg_stats->rx_frames > (ULONG_MAX / HZ))
136 can_init_stats(net);
137
138 /* prevent overflow in calc_rate() */
139 if (pkg_stats->tx_frames > (ULONG_MAX / HZ))
140 can_init_stats(net);
141
142 /* matches overflow - very improbable */
143 if (pkg_stats->matches > (ULONG_MAX / 100))
144 can_init_stats(net);
145
146 /* calc total values */
147 if (pkg_stats->rx_frames)
148 pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) /
149 pkg_stats->rx_frames;
150
151 pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j,
152 pkg_stats->tx_frames);
153 pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j,
154 pkg_stats->rx_frames);
155
156 /* calc current values */
157 if (pkg_stats->rx_frames_delta)
158 pkg_stats->current_rx_match_ratio =
159 (pkg_stats->matches_delta * 100) /
160 pkg_stats->rx_frames_delta;
161
162 pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta);
163 pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta);
164
165 /* check / update maximum values */
166 if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate)
167 pkg_stats->max_tx_rate = pkg_stats->current_tx_rate;
168
169 if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate)
170 pkg_stats->max_rx_rate = pkg_stats->current_rx_rate;
171
172 if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio)
173 pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
174
175 /* clear values for 'current rate' calculation */
176 pkg_stats->tx_frames_delta = 0;
177 pkg_stats->rx_frames_delta = 0;
178 pkg_stats->matches_delta = 0;
179
180 /* restart timer (one second) */
181 mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ));
182}
183
184/*
185 * proc read functions
186 */
187
188static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
189 struct net_device *dev)
190{
191 struct receiver *r;
192
193 hlist_for_each_entry_rcu(r, rx_list, list) {
194 char *fmt = (r->can_id & CAN_EFF_FLAG)?
195 " %-5s %08x %08x %pK %pK %8ld %s\n" :
196 " %-5s %03x %08x %pK %pK %8ld %s\n";
197
198 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
199 r->func, r->data, r->matches, r->ident);
200 }
201}
202
203static void can_print_recv_banner(struct seq_file *m)
204{
205 /*
206 * can1. 00000000 00000000 00000000
207 * ....... 0 tp20
208 */
209 seq_puts(m, " device can_id can_mask function"
210 " userdata matches ident\n");
211}
212
213static int can_stats_proc_show(struct seq_file *m, void *v)
214{
215 struct net *net = m->private;
216 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
217 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
218
219 seq_putc(m, '\n');
220 seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames);
221 seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames);
222 seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches);
223
224 seq_putc(m, '\n');
225
226 if (net->can.stattimer.function == can_stat_update) {
227 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
228 pkg_stats->total_rx_match_ratio);
229
230 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
231 pkg_stats->total_tx_rate);
232 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
233 pkg_stats->total_rx_rate);
234
235 seq_putc(m, '\n');
236
237 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
238 pkg_stats->current_rx_match_ratio);
239
240 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
241 pkg_stats->current_tx_rate);
242 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
243 pkg_stats->current_rx_rate);
244
245 seq_putc(m, '\n');
246
247 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
248 pkg_stats->max_rx_match_ratio);
249
250 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
251 pkg_stats->max_tx_rate);
252 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
253 pkg_stats->max_rx_rate);
254
255 seq_putc(m, '\n');
256 }
257
258 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
259 rcv_lists_stats->rcv_entries);
260 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
261 rcv_lists_stats->rcv_entries_max);
262
263 if (rcv_lists_stats->stats_reset)
264 seq_printf(m, "\n %8ld statistic resets (STR)\n",
265 rcv_lists_stats->stats_reset);
266
267 if (rcv_lists_stats->user_reset)
268 seq_printf(m, " %8ld user statistic resets (USTR)\n",
269 rcv_lists_stats->user_reset);
270
271 seq_putc(m, '\n');
272 return 0;
273}
274
275static int can_reset_stats_proc_show(struct seq_file *m, void *v)
276{
277 struct net *net = m->private;
278 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
279 struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
280
281 user_reset = 1;
282
283 if (net->can.stattimer.function == can_stat_update) {
284 seq_printf(m, "Scheduled statistic reset #%ld.\n",
285 rcv_lists_stats->stats_reset + 1);
286 } else {
287 if (pkg_stats->jiffies_init != jiffies)
288 can_init_stats(net);
289
290 seq_printf(m, "Performed statistic reset #%ld.\n",
291 rcv_lists_stats->stats_reset);
292 }
293 return 0;
294}
295
296static int can_version_proc_show(struct seq_file *m, void *v)
297{
298 seq_printf(m, "%s\n", CAN_VERSION_STRING);
299 return 0;
300}
301
302static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
303 struct net_device *dev,
304 struct can_dev_rcv_lists *dev_rcv_lists)
305{
306 if (!hlist_empty(&dev_rcv_lists->rx[idx])) {
307 can_print_recv_banner(m);
308 can_print_rcvlist(m, &dev_rcv_lists->rx[idx], dev);
309 } else
310 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
311
312}
313
314static int can_rcvlist_proc_show(struct seq_file *m, void *v)
315{
316 /* double cast to prevent GCC warning */
317 int idx = (int)(long)PDE_DATA(m->file->f_inode);
318 struct net_device *dev;
319 struct can_dev_rcv_lists *dev_rcv_lists;
320 struct net *net = m->private;
321
322 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
323
324 rcu_read_lock();
325
326 /* receive list for 'all' CAN devices (dev == NULL) */
327 dev_rcv_lists = net->can.rx_alldev_list;
328 can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists);
329
330 /* receive list for registered CAN devices */
331 for_each_netdev_rcu(net, dev) {
332 if (dev->type == ARPHRD_CAN && dev->ml_priv)
333 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
334 }
335
336 rcu_read_unlock();
337
338 seq_putc(m, '\n');
339 return 0;
340}
341
342static inline void can_rcvlist_proc_show_array(struct seq_file *m,
343 struct net_device *dev,
344 struct hlist_head *rcv_array,
345 unsigned int rcv_array_sz)
346{
347 unsigned int i;
348 int all_empty = 1;
349
350 /* check whether at least one list is non-empty */
351 for (i = 0; i < rcv_array_sz; i++)
352 if (!hlist_empty(&rcv_array[i])) {
353 all_empty = 0;
354 break;
355 }
356
357 if (!all_empty) {
358 can_print_recv_banner(m);
359 for (i = 0; i < rcv_array_sz; i++) {
360 if (!hlist_empty(&rcv_array[i]))
361 can_print_rcvlist(m, &rcv_array[i], dev);
362 }
363 } else
364 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
365}
366
367static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
368{
369 struct net_device *dev;
370 struct can_dev_rcv_lists *dev_rcv_lists;
371 struct net *net = m->private;
372
373 /* RX_SFF */
374 seq_puts(m, "\nreceive list 'rx_sff':\n");
375
376 rcu_read_lock();
377
378 /* sff receive list for 'all' CAN devices (dev == NULL) */
379 dev_rcv_lists = net->can.rx_alldev_list;
380 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff,
381 ARRAY_SIZE(dev_rcv_lists->rx_sff));
382
383 /* sff receive list for registered CAN devices */
384 for_each_netdev_rcu(net, dev) {
385 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
386 dev_rcv_lists = dev->ml_priv;
387 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff,
388 ARRAY_SIZE(dev_rcv_lists->rx_sff));
389 }
390 }
391
392 rcu_read_unlock();
393
394 seq_putc(m, '\n');
395 return 0;
396}
397
398static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
399{
400 struct net_device *dev;
401 struct can_dev_rcv_lists *dev_rcv_lists;
402 struct net *net = m->private;
403
404 /* RX_EFF */
405 seq_puts(m, "\nreceive list 'rx_eff':\n");
406
407 rcu_read_lock();
408
409 /* eff receive list for 'all' CAN devices (dev == NULL) */
410 dev_rcv_lists = net->can.rx_alldev_list;
411 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff,
412 ARRAY_SIZE(dev_rcv_lists->rx_eff));
413
414 /* eff receive list for registered CAN devices */
415 for_each_netdev_rcu(net, dev) {
416 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
417 dev_rcv_lists = dev->ml_priv;
418 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_eff,
419 ARRAY_SIZE(dev_rcv_lists->rx_eff));
420 }
421 }
422
423 rcu_read_unlock();
424
425 seq_putc(m, '\n');
426 return 0;
427}
428
429/*
430 * can_init_proc - create main CAN proc directory and procfs entries
431 */
432void can_init_proc(struct net *net)
433{
434 /* create /proc/net/can directory */
435 net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
436
437 if (!net->can.proc_dir) {
438 printk(KERN_INFO "can: failed to create /proc/net/can . "
439 "CONFIG_PROC_FS missing?\n");
440 return;
441 }
442
443 /* own procfs entries from the AF_CAN core */
444 net->can.pde_version = proc_create_net_single(CAN_PROC_VERSION, 0644,
445 net->can.proc_dir, can_version_proc_show, NULL);
446 net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644,
447 net->can.proc_dir, can_stats_proc_show, NULL);
448 net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS,
449 0644, net->can.proc_dir, can_reset_stats_proc_show,
450 NULL);
451 net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR,
452 0644, net->can.proc_dir, can_rcvlist_proc_show,
453 (void *)RX_ERR);
454 net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL,
455 0644, net->can.proc_dir, can_rcvlist_proc_show,
456 (void *)RX_ALL);
457 net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL,
458 0644, net->can.proc_dir, can_rcvlist_proc_show,
459 (void *)RX_FIL);
460 net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV,
461 0644, net->can.proc_dir, can_rcvlist_proc_show,
462 (void *)RX_INV);
463 net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF,
464 0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL);
465 net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF,
466 0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL);
467}
468
469/*
470 * can_remove_proc - remove procfs entries and main CAN proc directory
471 */
472void can_remove_proc(struct net *net)
473{
474 if (net->can.pde_version)
475 remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
476
477 if (net->can.pde_stats)
478 remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
479
480 if (net->can.pde_reset_stats)
481 remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
482
483 if (net->can.pde_rcvlist_err)
484 remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
485
486 if (net->can.pde_rcvlist_all)
487 remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
488
489 if (net->can.pde_rcvlist_fil)
490 remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
491
492 if (net->can.pde_rcvlist_inv)
493 remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
494
495 if (net->can.pde_rcvlist_eff)
496 remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
497
498 if (net->can.pde_rcvlist_sff)
499 remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
500
501 if (net->can.proc_dir)
502 remove_proc_entry("can", net->proc_net);
503}