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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 int user_reset;
66
67static const char rx_list_name[][8] = {
68 [RX_ERR] = "rx_err",
69 [RX_ALL] = "rx_all",
70 [RX_FIL] = "rx_fil",
71 [RX_INV] = "rx_inv",
72};
73
74/*
75 * af_can statistics stuff
76 */
77
78static void can_init_stats(struct net *net)
79{
80 struct s_stats *can_stats = net->can.can_stats;
81 struct s_pstats *can_pstats = net->can.can_pstats;
82 /*
83 * This memset function is called from a timer context (when
84 * can_stattimer is active which is the default) OR in a process
85 * context (reading the proc_fs when can_stattimer is disabled).
86 */
87 memset(can_stats, 0, sizeof(struct s_stats));
88 can_stats->jiffies_init = jiffies;
89
90 can_pstats->stats_reset++;
91
92 if (user_reset) {
93 user_reset = 0;
94 can_pstats->user_reset++;
95 }
96}
97
98static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
99 unsigned long count)
100{
101 unsigned long rate;
102
103 if (oldjif == newjif)
104 return 0;
105
106 /* see can_stat_update() - this should NEVER happen! */
107 if (count > (ULONG_MAX / HZ)) {
108 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
109 count);
110 return 99999999;
111 }
112
113 rate = (count * HZ) / (newjif - oldjif);
114
115 return rate;
116}
117
118void can_stat_update(struct timer_list *t)
119{
120 struct net *net = from_timer(net, t, can.can_stattimer);
121 struct s_stats *can_stats = net->can.can_stats;
122 unsigned long j = jiffies; /* snapshot */
123
124 /* restart counting in timer context on user request */
125 if (user_reset)
126 can_init_stats(net);
127
128 /* restart counting on jiffies overflow */
129 if (j < can_stats->jiffies_init)
130 can_init_stats(net);
131
132 /* prevent overflow in calc_rate() */
133 if (can_stats->rx_frames > (ULONG_MAX / HZ))
134 can_init_stats(net);
135
136 /* prevent overflow in calc_rate() */
137 if (can_stats->tx_frames > (ULONG_MAX / HZ))
138 can_init_stats(net);
139
140 /* matches overflow - very improbable */
141 if (can_stats->matches > (ULONG_MAX / 100))
142 can_init_stats(net);
143
144 /* calc total values */
145 if (can_stats->rx_frames)
146 can_stats->total_rx_match_ratio = (can_stats->matches * 100) /
147 can_stats->rx_frames;
148
149 can_stats->total_tx_rate = calc_rate(can_stats->jiffies_init, j,
150 can_stats->tx_frames);
151 can_stats->total_rx_rate = calc_rate(can_stats->jiffies_init, j,
152 can_stats->rx_frames);
153
154 /* calc current values */
155 if (can_stats->rx_frames_delta)
156 can_stats->current_rx_match_ratio =
157 (can_stats->matches_delta * 100) /
158 can_stats->rx_frames_delta;
159
160 can_stats->current_tx_rate = calc_rate(0, HZ, can_stats->tx_frames_delta);
161 can_stats->current_rx_rate = calc_rate(0, HZ, can_stats->rx_frames_delta);
162
163 /* check / update maximum values */
164 if (can_stats->max_tx_rate < can_stats->current_tx_rate)
165 can_stats->max_tx_rate = can_stats->current_tx_rate;
166
167 if (can_stats->max_rx_rate < can_stats->current_rx_rate)
168 can_stats->max_rx_rate = can_stats->current_rx_rate;
169
170 if (can_stats->max_rx_match_ratio < can_stats->current_rx_match_ratio)
171 can_stats->max_rx_match_ratio = can_stats->current_rx_match_ratio;
172
173 /* clear values for 'current rate' calculation */
174 can_stats->tx_frames_delta = 0;
175 can_stats->rx_frames_delta = 0;
176 can_stats->matches_delta = 0;
177
178 /* restart timer (one second) */
179 mod_timer(&net->can.can_stattimer, round_jiffies(jiffies + HZ));
180}
181
182/*
183 * proc read functions
184 */
185
186static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
187 struct net_device *dev)
188{
189 struct receiver *r;
190
191 hlist_for_each_entry_rcu(r, rx_list, list) {
192 char *fmt = (r->can_id & CAN_EFF_FLAG)?
193 " %-5s %08x %08x %pK %pK %8ld %s\n" :
194 " %-5s %03x %08x %pK %pK %8ld %s\n";
195
196 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
197 r->func, r->data, r->matches, r->ident);
198 }
199}
200
201static void can_print_recv_banner(struct seq_file *m)
202{
203 /*
204 * can1. 00000000 00000000 00000000
205 * ....... 0 tp20
206 */
207 seq_puts(m, " device can_id can_mask function"
208 " userdata matches ident\n");
209}
210
211static int can_stats_proc_show(struct seq_file *m, void *v)
212{
213 struct net *net = m->private;
214 struct s_stats *can_stats = net->can.can_stats;
215 struct s_pstats *can_pstats = net->can.can_pstats;
216
217 seq_putc(m, '\n');
218 seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats->tx_frames);
219 seq_printf(m, " %8ld received frames (RXF)\n", can_stats->rx_frames);
220 seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats->matches);
221
222 seq_putc(m, '\n');
223
224 if (net->can.can_stattimer.function == can_stat_update) {
225 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
226 can_stats->total_rx_match_ratio);
227
228 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
229 can_stats->total_tx_rate);
230 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
231 can_stats->total_rx_rate);
232
233 seq_putc(m, '\n');
234
235 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
236 can_stats->current_rx_match_ratio);
237
238 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
239 can_stats->current_tx_rate);
240 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
241 can_stats->current_rx_rate);
242
243 seq_putc(m, '\n');
244
245 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
246 can_stats->max_rx_match_ratio);
247
248 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
249 can_stats->max_tx_rate);
250 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
251 can_stats->max_rx_rate);
252
253 seq_putc(m, '\n');
254 }
255
256 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
257 can_pstats->rcv_entries);
258 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
259 can_pstats->rcv_entries_max);
260
261 if (can_pstats->stats_reset)
262 seq_printf(m, "\n %8ld statistic resets (STR)\n",
263 can_pstats->stats_reset);
264
265 if (can_pstats->user_reset)
266 seq_printf(m, " %8ld user statistic resets (USTR)\n",
267 can_pstats->user_reset);
268
269 seq_putc(m, '\n');
270 return 0;
271}
272
273static int can_stats_proc_open(struct inode *inode, struct file *file)
274{
275 return single_open_net(inode, file, can_stats_proc_show);
276}
277
278static const struct file_operations can_stats_proc_fops = {
279 .open = can_stats_proc_open,
280 .read = seq_read,
281 .llseek = seq_lseek,
282 .release = single_release,
283};
284
285static int can_reset_stats_proc_show(struct seq_file *m, void *v)
286{
287 struct net *net = m->private;
288 struct s_pstats *can_pstats = net->can.can_pstats;
289 struct s_stats *can_stats = net->can.can_stats;
290
291 user_reset = 1;
292
293 if (net->can.can_stattimer.function == can_stat_update) {
294 seq_printf(m, "Scheduled statistic reset #%ld.\n",
295 can_pstats->stats_reset + 1);
296 } else {
297 if (can_stats->jiffies_init != jiffies)
298 can_init_stats(net);
299
300 seq_printf(m, "Performed statistic reset #%ld.\n",
301 can_pstats->stats_reset);
302 }
303 return 0;
304}
305
306static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
307{
308 return single_open_net(inode, file, can_reset_stats_proc_show);
309}
310
311static const struct file_operations can_reset_stats_proc_fops = {
312 .open = can_reset_stats_proc_open,
313 .read = seq_read,
314 .llseek = seq_lseek,
315 .release = single_release,
316};
317
318static int can_version_proc_show(struct seq_file *m, void *v)
319{
320 seq_printf(m, "%s\n", CAN_VERSION_STRING);
321 return 0;
322}
323
324static int can_version_proc_open(struct inode *inode, struct file *file)
325{
326 return single_open_net(inode, file, can_version_proc_show);
327}
328
329static const struct file_operations can_version_proc_fops = {
330 .open = can_version_proc_open,
331 .read = seq_read,
332 .llseek = seq_lseek,
333 .release = single_release,
334};
335
336static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
337 struct net_device *dev,
338 struct can_dev_rcv_lists *d)
339{
340 if (!hlist_empty(&d->rx[idx])) {
341 can_print_recv_banner(m);
342 can_print_rcvlist(m, &d->rx[idx], dev);
343 } else
344 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
345
346}
347
348static int can_rcvlist_proc_show(struct seq_file *m, void *v)
349{
350 /* double cast to prevent GCC warning */
351 int idx = (int)(long)PDE_DATA(m->file->f_inode);
352 struct net_device *dev;
353 struct can_dev_rcv_lists *d;
354 struct net *net = m->private;
355
356 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
357
358 rcu_read_lock();
359
360 /* receive list for 'all' CAN devices (dev == NULL) */
361 d = net->can.can_rx_alldev_list;
362 can_rcvlist_proc_show_one(m, idx, NULL, d);
363
364 /* receive list for registered CAN devices */
365 for_each_netdev_rcu(net, dev) {
366 if (dev->type == ARPHRD_CAN && dev->ml_priv)
367 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
368 }
369
370 rcu_read_unlock();
371
372 seq_putc(m, '\n');
373 return 0;
374}
375
376static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
377{
378 return single_open_net(inode, file, can_rcvlist_proc_show);
379}
380
381static const struct file_operations can_rcvlist_proc_fops = {
382 .open = can_rcvlist_proc_open,
383 .read = seq_read,
384 .llseek = seq_lseek,
385 .release = single_release,
386};
387
388static inline void can_rcvlist_proc_show_array(struct seq_file *m,
389 struct net_device *dev,
390 struct hlist_head *rcv_array,
391 unsigned int rcv_array_sz)
392{
393 unsigned int i;
394 int all_empty = 1;
395
396 /* check whether at least one list is non-empty */
397 for (i = 0; i < rcv_array_sz; i++)
398 if (!hlist_empty(&rcv_array[i])) {
399 all_empty = 0;
400 break;
401 }
402
403 if (!all_empty) {
404 can_print_recv_banner(m);
405 for (i = 0; i < rcv_array_sz; i++) {
406 if (!hlist_empty(&rcv_array[i]))
407 can_print_rcvlist(m, &rcv_array[i], dev);
408 }
409 } else
410 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
411}
412
413static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
414{
415 struct net_device *dev;
416 struct can_dev_rcv_lists *d;
417 struct net *net = m->private;
418
419 /* RX_SFF */
420 seq_puts(m, "\nreceive list 'rx_sff':\n");
421
422 rcu_read_lock();
423
424 /* sff receive list for 'all' CAN devices (dev == NULL) */
425 d = net->can.can_rx_alldev_list;
426 can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
427
428 /* sff receive list for registered CAN devices */
429 for_each_netdev_rcu(net, dev) {
430 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
431 d = dev->ml_priv;
432 can_rcvlist_proc_show_array(m, dev, d->rx_sff,
433 ARRAY_SIZE(d->rx_sff));
434 }
435 }
436
437 rcu_read_unlock();
438
439 seq_putc(m, '\n');
440 return 0;
441}
442
443static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
444{
445 return single_open_net(inode, file, can_rcvlist_sff_proc_show);
446}
447
448static const struct file_operations can_rcvlist_sff_proc_fops = {
449 .open = can_rcvlist_sff_proc_open,
450 .read = seq_read,
451 .llseek = seq_lseek,
452 .release = single_release,
453};
454
455
456static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
457{
458 struct net_device *dev;
459 struct can_dev_rcv_lists *d;
460 struct net *net = m->private;
461
462 /* RX_EFF */
463 seq_puts(m, "\nreceive list 'rx_eff':\n");
464
465 rcu_read_lock();
466
467 /* eff receive list for 'all' CAN devices (dev == NULL) */
468 d = net->can.can_rx_alldev_list;
469 can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
470
471 /* eff receive list for registered CAN devices */
472 for_each_netdev_rcu(net, dev) {
473 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
474 d = dev->ml_priv;
475 can_rcvlist_proc_show_array(m, dev, d->rx_eff,
476 ARRAY_SIZE(d->rx_eff));
477 }
478 }
479
480 rcu_read_unlock();
481
482 seq_putc(m, '\n');
483 return 0;
484}
485
486static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
487{
488 return single_open_net(inode, file, can_rcvlist_eff_proc_show);
489}
490
491static const struct file_operations can_rcvlist_eff_proc_fops = {
492 .open = can_rcvlist_eff_proc_open,
493 .read = seq_read,
494 .llseek = seq_lseek,
495 .release = single_release,
496};
497
498/*
499 * can_init_proc - create main CAN proc directory and procfs entries
500 */
501void can_init_proc(struct net *net)
502{
503 /* create /proc/net/can directory */
504 net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
505
506 if (!net->can.proc_dir) {
507 printk(KERN_INFO "can: failed to create /proc/net/can . "
508 "CONFIG_PROC_FS missing?\n");
509 return;
510 }
511
512 /* own procfs entries from the AF_CAN core */
513 net->can.pde_version = proc_create(CAN_PROC_VERSION, 0644,
514 net->can.proc_dir,
515 &can_version_proc_fops);
516 net->can.pde_stats = proc_create(CAN_PROC_STATS, 0644,
517 net->can.proc_dir,
518 &can_stats_proc_fops);
519 net->can.pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644,
520 net->can.proc_dir,
521 &can_reset_stats_proc_fops);
522 net->can.pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644,
523 net->can.proc_dir,
524 &can_rcvlist_proc_fops,
525 (void *)RX_ERR);
526 net->can.pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644,
527 net->can.proc_dir,
528 &can_rcvlist_proc_fops,
529 (void *)RX_ALL);
530 net->can.pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644,
531 net->can.proc_dir,
532 &can_rcvlist_proc_fops,
533 (void *)RX_FIL);
534 net->can.pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644,
535 net->can.proc_dir,
536 &can_rcvlist_proc_fops,
537 (void *)RX_INV);
538 net->can.pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644,
539 net->can.proc_dir,
540 &can_rcvlist_eff_proc_fops);
541 net->can.pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644,
542 net->can.proc_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(struct net *net)
550{
551 if (net->can.pde_version)
552 remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
553
554 if (net->can.pde_stats)
555 remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
556
557 if (net->can.pde_reset_stats)
558 remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
559
560 if (net->can.pde_rcvlist_err)
561 remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
562
563 if (net->can.pde_rcvlist_all)
564 remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
565
566 if (net->can.pde_rcvlist_fil)
567 remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
568
569 if (net->can.pde_rcvlist_inv)
570 remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
571
572 if (net->can.pde_rcvlist_eff)
573 remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
574
575 if (net->can.pde_rcvlist_sff)
576 remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
577
578 if (net->can.proc_dir)
579 remove_proc_entry("can", net->proc_net);
580}