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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/*
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}
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}