1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
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
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
88
89
90static void can_init_stats(void)
91{
92
93
94
95
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
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;
131
132
133 if (user_reset)
134 can_init_stats();
135
136
137 if (j < can_stats.jiffies_init)
138 can_init_stats();
139
140
141 if (can_stats.rx_frames > (ULONG_MAX / HZ))
142 can_init_stats();
143
144
145 if (can_stats.tx_frames > (ULONG_MAX / HZ))
146 can_init_stats();
147
148
149 if (can_stats.matches > (ULONG_MAX / 100))
150 can_init_stats();
151
152
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
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
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
182 can_stats.tx_frames_delta = 0;
183 can_stats.rx_frames_delta = 0;
184 can_stats.matches_delta = 0;
185
186
187 mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
188}
189
190
191
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 struct hlist_node *n;
199
200 hlist_for_each_entry_rcu(r, n, rx_list, list) {
201 char *fmt = (r->can_id & CAN_EFF_FLAG)?
202 " %-5s %08x %08x %pK %pK %8ld %s\n" :
203 " %-5s %03x %08x %pK %pK %8ld %s\n";
204
205 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
206 r->func, r->data, r->matches, r->ident);
207 }
208}
209
210static void can_print_recv_banner(struct seq_file *m)
211{
212
213
214
215
216 seq_puts(m, " device can_id can_mask function"
217 " userdata matches ident\n");
218}
219
220static int can_stats_proc_show(struct seq_file *m, void *v)
221{
222 seq_putc(m, '\n');
223 seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
224 seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
225 seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
226
227 seq_putc(m, '\n');
228
229 if (can_stattimer.function == can_stat_update) {
230 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
231 can_stats.total_rx_match_ratio);
232
233 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
234 can_stats.total_tx_rate);
235 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
236 can_stats.total_rx_rate);
237
238 seq_putc(m, '\n');
239
240 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
241 can_stats.current_rx_match_ratio);
242
243 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
244 can_stats.current_tx_rate);
245 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
246 can_stats.current_rx_rate);
247
248 seq_putc(m, '\n');
249
250 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
251 can_stats.max_rx_match_ratio);
252
253 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
254 can_stats.max_tx_rate);
255 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
256 can_stats.max_rx_rate);
257
258 seq_putc(m, '\n');
259 }
260
261 seq_printf(m, " %8ld current receive list entries (CRCV)\n",
262 can_pstats.rcv_entries);
263 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
264 can_pstats.rcv_entries_max);
265
266 if (can_pstats.stats_reset)
267 seq_printf(m, "\n %8ld statistic resets (STR)\n",
268 can_pstats.stats_reset);
269
270 if (can_pstats.user_reset)
271 seq_printf(m, " %8ld user statistic resets (USTR)\n",
272 can_pstats.user_reset);
273
274 seq_putc(m, '\n');
275 return 0;
276}
277
278static int can_stats_proc_open(struct inode *inode, struct file *file)
279{
280 return single_open(file, can_stats_proc_show, NULL);
281}
282
283static const struct file_operations can_stats_proc_fops = {
284 .owner = THIS_MODULE,
285 .open = can_stats_proc_open,
286 .read = seq_read,
287 .llseek = seq_lseek,
288 .release = single_release,
289};
290
291static int can_reset_stats_proc_show(struct seq_file *m, void *v)
292{
293 user_reset = 1;
294
295 if (can_stattimer.function == can_stat_update) {
296 seq_printf(m, "Scheduled statistic reset #%ld.\n",
297 can_pstats.stats_reset + 1);
298
299 } else {
300 if (can_stats.jiffies_init != jiffies)
301 can_init_stats();
302
303 seq_printf(m, "Performed statistic reset #%ld.\n",
304 can_pstats.stats_reset);
305 }
306 return 0;
307}
308
309static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
310{
311 return single_open(file, can_reset_stats_proc_show, NULL);
312}
313
314static const struct file_operations can_reset_stats_proc_fops = {
315 .owner = THIS_MODULE,
316 .open = can_reset_stats_proc_open,
317 .read = seq_read,
318 .llseek = seq_lseek,
319 .release = single_release,
320};
321
322static int can_version_proc_show(struct seq_file *m, void *v)
323{
324 seq_printf(m, "%s\n", CAN_VERSION_STRING);
325 return 0;
326}
327
328static int can_version_proc_open(struct inode *inode, struct file *file)
329{
330 return single_open(file, can_version_proc_show, NULL);
331}
332
333static const struct file_operations can_version_proc_fops = {
334 .owner = THIS_MODULE,
335 .open = can_version_proc_open,
336 .read = seq_read,
337 .llseek = seq_lseek,
338 .release = single_release,
339};
340
341static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
342 struct net_device *dev,
343 struct dev_rcv_lists *d)
344{
345 if (!hlist_empty(&d->rx[idx])) {
346 can_print_recv_banner(m);
347 can_print_rcvlist(m, &d->rx[idx], dev);
348 } else
349 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
350
351}
352
353static int can_rcvlist_proc_show(struct seq_file *m, void *v)
354{
355
356 int idx = (int)(long)m->private;
357 struct net_device *dev;
358 struct dev_rcv_lists *d;
359
360 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
361
362 rcu_read_lock();
363
364
365 d = &can_rx_alldev_list;
366 can_rcvlist_proc_show_one(m, idx, NULL, d);
367
368
369 for_each_netdev_rcu(&init_net, dev) {
370 if (dev->type == ARPHRD_CAN && dev->ml_priv)
371 can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
372 }
373
374 rcu_read_unlock();
375
376 seq_putc(m, '\n');
377 return 0;
378}
379
380static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
381{
382 return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
383}
384
385static const struct file_operations can_rcvlist_proc_fops = {
386 .owner = THIS_MODULE,
387 .open = can_rcvlist_proc_open,
388 .read = seq_read,
389 .llseek = seq_lseek,
390 .release = single_release,
391};
392
393static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
394 struct net_device *dev,
395 struct dev_rcv_lists *d)
396{
397 int i;
398 int all_empty = 1;
399
400
401 for (i = 0; i < 0x800; i++)
402 if (!hlist_empty(&d->rx_sff[i])) {
403 all_empty = 0;
404 break;
405 }
406
407 if (!all_empty) {
408 can_print_recv_banner(m);
409 for (i = 0; i < 0x800; i++) {
410 if (!hlist_empty(&d->rx_sff[i]))
411 can_print_rcvlist(m, &d->rx_sff[i], dev);
412 }
413 } else
414 seq_printf(m, " (%s: no entry)\n", DNAME(dev));
415}
416
417static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
418{
419 struct net_device *dev;
420 struct dev_rcv_lists *d;
421
422
423 seq_puts(m, "\nreceive list 'rx_sff':\n");
424
425 rcu_read_lock();
426
427
428 d = &can_rx_alldev_list;
429 can_rcvlist_sff_proc_show_one(m, NULL, d);
430
431
432 for_each_netdev_rcu(&init_net, dev) {
433 if (dev->type == ARPHRD_CAN && dev->ml_priv)
434 can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
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(file, can_rcvlist_sff_proc_show, NULL);
446}
447
448static const struct file_operations can_rcvlist_sff_proc_fops = {
449 .owner = THIS_MODULE,
450 .open = can_rcvlist_sff_proc_open,
451 .read = seq_read,
452 .llseek = seq_lseek,
453 .release = single_release,
454};
455
456
457
458
459
460static void can_remove_proc_readentry(const char *name)
461{
462 if (can_dir)
463 remove_proc_entry(name, can_dir);
464}
465
466
467
468
469void can_init_proc(void)
470{
471
472 can_dir = proc_mkdir("can", init_net.proc_net);
473
474 if (!can_dir) {
475 printk(KERN_INFO "can: failed to create /proc/net/can . "
476 "CONFIG_PROC_FS missing?\n");
477 return;
478 }
479
480
481 pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir,
482 &can_version_proc_fops);
483 pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir,
484 &can_stats_proc_fops);
485 pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
486 &can_reset_stats_proc_fops);
487 pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
488 &can_rcvlist_proc_fops, (void *)RX_ERR);
489 pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
490 &can_rcvlist_proc_fops, (void *)RX_ALL);
491 pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
492 &can_rcvlist_proc_fops, (void *)RX_FIL);
493 pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
494 &can_rcvlist_proc_fops, (void *)RX_INV);
495 pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
496 &can_rcvlist_proc_fops, (void *)RX_EFF);
497 pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
498 &can_rcvlist_sff_proc_fops);
499}
500
501
502
503
504void can_remove_proc(void)
505{
506 if (pde_version)
507 can_remove_proc_readentry(CAN_PROC_VERSION);
508
509 if (pde_stats)
510 can_remove_proc_readentry(CAN_PROC_STATS);
511
512 if (pde_reset_stats)
513 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
514
515 if (pde_rcvlist_err)
516 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
517
518 if (pde_rcvlist_all)
519 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
520
521 if (pde_rcvlist_fil)
522 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
523
524 if (pde_rcvlist_inv)
525 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
526
527 if (pde_rcvlist_eff)
528 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
529
530 if (pde_rcvlist_sff)
531 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
532
533 if (can_dir)
534 proc_net_remove(&init_net, "can");
535}
536