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