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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/*
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};
84
85/*
86 * af_can statistics stuff
87 */
88
89static void can_init_stats(void)
90{
91 /*
92 * This memset function is called from a timer context (when
93 * can_stattimer is active which is the default) OR in a process
94 * context (reading the proc_fs when can_stattimer is disabled).
95 */
96 memset(&can_stats, 0, sizeof(can_stats));
97 can_stats.jiffies_init = jiffies;
98
99 can_pstats.stats_reset++;
100
101 if (user_reset) {
102 user_reset = 0;
103 can_pstats.user_reset++;
104 }
105}
106
107static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
108 unsigned long count)
109{
110 unsigned long rate;
111
112 if (oldjif == newjif)
113 return 0;
114
115 /* see can_stat_update() - this should NEVER happen! */
116 if (count > (ULONG_MAX / HZ)) {
117 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
118 count);
119 return 99999999;
120 }
121
122 rate = (count * HZ) / (newjif - oldjif);
123
124 return rate;
125}
126
127void can_stat_update(unsigned long data)
128{
129 unsigned long j = jiffies; /* snapshot */
130
131 /* restart counting in timer context on user request */
132 if (user_reset)
133 can_init_stats();
134
135 /* restart counting on jiffies overflow */
136 if (j < can_stats.jiffies_init)
137 can_init_stats();
138
139 /* prevent overflow in calc_rate() */
140 if (can_stats.rx_frames > (ULONG_MAX / HZ))
141 can_init_stats();
142
143 /* prevent overflow in calc_rate() */
144 if (can_stats.tx_frames > (ULONG_MAX / HZ))
145 can_init_stats();
146
147 /* matches overflow - very improbable */
148 if (can_stats.matches > (ULONG_MAX / 100))
149 can_init_stats();
150
151 /* calc total values */
152 if (can_stats.rx_frames)
153 can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
154 can_stats.rx_frames;
155
156 can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
157 can_stats.tx_frames);
158 can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
159 can_stats.rx_frames);
160
161 /* calc current values */
162 if (can_stats.rx_frames_delta)
163 can_stats.current_rx_match_ratio =
164 (can_stats.matches_delta * 100) /
165 can_stats.rx_frames_delta;
166
167 can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
168 can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
169
170 /* check / update maximum values */
171 if (can_stats.max_tx_rate < can_stats.current_tx_rate)
172 can_stats.max_tx_rate = can_stats.current_tx_rate;
173
174 if (can_stats.max_rx_rate < can_stats.current_rx_rate)
175 can_stats.max_rx_rate = can_stats.current_rx_rate;
176
177 if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
178 can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
179
180 /* clear values for 'current rate' calculation */
181 can_stats.tx_frames_delta = 0;
182 can_stats.rx_frames_delta = 0;
183 can_stats.matches_delta = 0;
184
185 /* restart timer (one second) */
186 mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
187}
188
189/*
190 * proc read functions
191 */
192
193static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
194 struct net_device *dev)
195{
196 struct receiver *r;
197
198 hlist_for_each_entry_rcu(r, rx_list, list) {
199 char *fmt = (r->can_id & CAN_EFF_FLAG)?
200 " %-5s %08x %08x %pK %pK %8ld %s\n" :
201 " %-5s %03x %08x %pK %pK %8ld %s\n";
202
203 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
204 r->func, r->data, r->matches, r->ident);
205 }
206}
207
208static void can_print_recv_banner(struct seq_file *m)
209{
210 /*
211 * can1. 00000000 00000000 00000000
212 * ....... 0 tp20
213 */
214 seq_puts(m, " device can_id can_mask function"
215 " userdata matches ident\n");
216}
217
218static int can_stats_proc_show(struct seq_file *m, void *v)
219{
220 seq_putc(m, '\n');
221 seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
222 seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
223 seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
224
225 seq_putc(m, '\n');
226
227 if (can_stattimer.function == can_stat_update) {
228 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
229 can_stats.total_rx_match_ratio);
230
231 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
232 can_stats.total_tx_rate);
233 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
234 can_stats.total_rx_rate);
235
236 seq_putc(m, '\n');
237
238 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
239 can_stats.current_rx_match_ratio);
240
241 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
242 can_stats.current_tx_rate);
243 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
244 can_stats.current_rx_rate);
245
246 seq_putc(m, '\n');
247
248 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
249 can_stats.max_rx_match_ratio);
250
251 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
252 can_stats.max_tx_rate);
253 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
254 can_stats.max_rx_rate);
255
256 seq_putc(m, '\n');
257 }
258
259 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
260 can_pstats.rcv_entries);
261 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
262 can_pstats.rcv_entries_max);
263
264 if (can_pstats.stats_reset)
265 seq_printf(m, "\n %8ld statistic resets (STR)\n",
266 can_pstats.stats_reset);
267
268 if (can_pstats.user_reset)
269 seq_printf(m, " %8ld user statistic resets (USTR)\n",
270 can_pstats.user_reset);
271
272 seq_putc(m, '\n');
273 return 0;
274}
275
276static int can_stats_proc_open(struct inode *inode, struct file *file)
277{
278 return single_open(file, can_stats_proc_show, NULL);
279}
280
281static const struct file_operations can_stats_proc_fops = {
282 .owner = THIS_MODULE,
283 .open = can_stats_proc_open,
284 .read = seq_read,
285 .llseek = seq_lseek,
286 .release = single_release,
287};
288
289static int can_reset_stats_proc_show(struct seq_file *m, void *v)
290{
291 user_reset = 1;
292
293 if (can_stattimer.function == can_stat_update) {
294 seq_printf(m, "Scheduled statistic reset #%ld.\n",
295 can_pstats.stats_reset + 1);
296
297 } else {
298 if (can_stats.jiffies_init != jiffies)
299 can_init_stats();
300
301 seq_printf(m, "Performed statistic reset #%ld.\n",
302 can_pstats.stats_reset);
303 }
304 return 0;
305}
306
307static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
308{
309 return single_open(file, can_reset_stats_proc_show, NULL);
310}
311
312static const struct file_operations can_reset_stats_proc_fops = {
313 .owner = THIS_MODULE,
314 .open = can_reset_stats_proc_open,
315 .read = seq_read,
316 .llseek = seq_lseek,
317 .release = single_release,
318};
319
320static int can_version_proc_show(struct seq_file *m, void *v)
321{
322 seq_printf(m, "%s\n", CAN_VERSION_STRING);
323 return 0;
324}
325
326static int can_version_proc_open(struct inode *inode, struct file *file)
327{
328 return single_open(file, can_version_proc_show, NULL);
329}
330
331static const struct file_operations can_version_proc_fops = {
332 .owner = THIS_MODULE,
333 .open = can_version_proc_open,
334 .read = seq_read,
335 .llseek = seq_lseek,
336 .release = single_release,
337};
338
339static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
340 struct net_device *dev,
341 struct dev_rcv_lists *d)
342{
343 if (!hlist_empty(&d->rx[idx])) {
344 can_print_recv_banner(m);
345 can_print_rcvlist(m, &d->rx[idx], dev);
346 } else
347 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
348
349}
350
351static int can_rcvlist_proc_show(struct seq_file *m, void *v)
352{
353 /* double cast to prevent GCC warning */
354 int idx = (int)(long)m->private;
355 struct net_device *dev;
356 struct dev_rcv_lists *d;
357
358 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
359
360 rcu_read_lock();
361
362 /* receive list for 'all' CAN devices (dev == NULL) */
363 d = &can_rx_alldev_list;
364 can_rcvlist_proc_show_one(m, idx, NULL, d);
365
366 /* receive list for registered CAN devices */
367 for_each_netdev_rcu(&init_net, dev) {
368 if (dev->type == ARPHRD_CAN && dev->ml_priv)
369 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
370 }
371
372 rcu_read_unlock();
373
374 seq_putc(m, '\n');
375 return 0;
376}
377
378static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
379{
380 return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode));
381}
382
383static const struct file_operations can_rcvlist_proc_fops = {
384 .owner = THIS_MODULE,
385 .open = can_rcvlist_proc_open,
386 .read = seq_read,
387 .llseek = seq_lseek,
388 .release = single_release,
389};
390
391static inline void can_rcvlist_proc_show_array(struct seq_file *m,
392 struct net_device *dev,
393 struct hlist_head *rcv_array,
394 unsigned int rcv_array_sz)
395{
396 unsigned int i;
397 int all_empty = 1;
398
399 /* check whether at least one list is non-empty */
400 for (i = 0; i < rcv_array_sz; i++)
401 if (!hlist_empty(&rcv_array[i])) {
402 all_empty = 0;
403 break;
404 }
405
406 if (!all_empty) {
407 can_print_recv_banner(m);
408 for (i = 0; i < rcv_array_sz; i++) {
409 if (!hlist_empty(&rcv_array[i]))
410 can_print_rcvlist(m, &rcv_array[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_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
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 d = dev->ml_priv;
434 can_rcvlist_proc_show_array(m, dev, d->rx_sff,
435 ARRAY_SIZE(d->rx_sff));
436 }
437 }
438
439 rcu_read_unlock();
440
441 seq_putc(m, '\n');
442 return 0;
443}
444
445static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
446{
447 return single_open(file, can_rcvlist_sff_proc_show, NULL);
448}
449
450static const struct file_operations can_rcvlist_sff_proc_fops = {
451 .owner = THIS_MODULE,
452 .open = can_rcvlist_sff_proc_open,
453 .read = seq_read,
454 .llseek = seq_lseek,
455 .release = single_release,
456};
457
458
459static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
460{
461 struct net_device *dev;
462 struct dev_rcv_lists *d;
463
464 /* RX_EFF */
465 seq_puts(m, "\nreceive list 'rx_eff':\n");
466
467 rcu_read_lock();
468
469 /* eff receive list for 'all' CAN devices (dev == NULL) */
470 d = &can_rx_alldev_list;
471 can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
472
473 /* eff receive list for registered CAN devices */
474 for_each_netdev_rcu(&init_net, dev) {
475 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
476 d = dev->ml_priv;
477 can_rcvlist_proc_show_array(m, dev, d->rx_eff,
478 ARRAY_SIZE(d->rx_eff));
479 }
480 }
481
482 rcu_read_unlock();
483
484 seq_putc(m, '\n');
485 return 0;
486}
487
488static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
489{
490 return single_open(file, can_rcvlist_eff_proc_show, NULL);
491}
492
493static const struct file_operations can_rcvlist_eff_proc_fops = {
494 .owner = THIS_MODULE,
495 .open = can_rcvlist_eff_proc_open,
496 .read = seq_read,
497 .llseek = seq_lseek,
498 .release = single_release,
499};
500
501/*
502 * proc utility functions
503 */
504
505static void can_remove_proc_readentry(const char *name)
506{
507 if (can_dir)
508 remove_proc_entry(name, can_dir);
509}
510
511/*
512 * can_init_proc - create main CAN proc directory and procfs entries
513 */
514void can_init_proc(void)
515{
516 /* create /proc/net/can directory */
517 can_dir = proc_mkdir("can", init_net.proc_net);
518
519 if (!can_dir) {
520 printk(KERN_INFO "can: failed to create /proc/net/can . "
521 "CONFIG_PROC_FS missing?\n");
522 return;
523 }
524
525 /* own procfs entries from the AF_CAN core */
526 pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
527 &can_version_proc_fops);
528 pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
529 &can_stats_proc_fops);
530 pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
531 &can_reset_stats_proc_fops);
532 pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
533 &can_rcvlist_proc_fops, (void *)RX_ERR);
534 pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
535 &can_rcvlist_proc_fops, (void *)RX_ALL);
536 pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
537 &can_rcvlist_proc_fops, (void *)RX_FIL);
538 pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
539 &can_rcvlist_proc_fops, (void *)RX_INV);
540 pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
541 &can_rcvlist_eff_proc_fops);
542 pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
543 &can_rcvlist_sff_proc_fops);
544}
545
546/*
547 * can_remove_proc - remove procfs entries and main CAN proc directory
548 */
549void can_remove_proc(void)
550{
551 if (pde_version)
552 can_remove_proc_readentry(CAN_PROC_VERSION);
553
554 if (pde_stats)
555 can_remove_proc_readentry(CAN_PROC_STATS);
556
557 if (pde_reset_stats)
558 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
559
560 if (pde_rcvlist_err)
561 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
562
563 if (pde_rcvlist_all)
564 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
565
566 if (pde_rcvlist_fil)
567 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
568
569 if (pde_rcvlist_inv)
570 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
571
572 if (pde_rcvlist_eff)
573 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
574
575 if (pde_rcvlist_sff)
576 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
577
578 if (can_dir)
579 remove_proc_entry("can", init_net.proc_net);
580}