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TOMOYO Linux Cross Reference
Linux/net/can/proc.c

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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 
 65 static int user_reset;
 66 
 67 static 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 
 78 static 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 
 98 static 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 
118 void 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 
186 static 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 
201 static 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 
211 static 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 
273 static 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 
278 static const struct file_operations can_stats_proc_fops = {
279         .owner          = THIS_MODULE,
280         .open           = can_stats_proc_open,
281         .read           = seq_read,
282         .llseek         = seq_lseek,
283         .release        = single_release,
284 };
285 
286 static int can_reset_stats_proc_show(struct seq_file *m, void *v)
287 {
288         struct net *net = m->private;
289         struct s_pstats *can_pstats = net->can.can_pstats;
290         struct s_stats *can_stats = net->can.can_stats;
291 
292         user_reset = 1;
293 
294         if (net->can.can_stattimer.function == can_stat_update) {
295                 seq_printf(m, "Scheduled statistic reset #%ld.\n",
296                                 can_pstats->stats_reset + 1);
297         } else {
298                 if (can_stats->jiffies_init != jiffies)
299                         can_init_stats(net);
300 
301                 seq_printf(m, "Performed statistic reset #%ld.\n",
302                                 can_pstats->stats_reset);
303         }
304         return 0;
305 }
306 
307 static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
308 {
309         return single_open_net(inode, file, can_reset_stats_proc_show);
310 }
311 
312 static 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 
320 static 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 
326 static int can_version_proc_open(struct inode *inode, struct file *file)
327 {
328         return single_open_net(inode, file, can_version_proc_show);
329 }
330 
331 static 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 
339 static 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 
351 static int can_rcvlist_proc_show(struct seq_file *m, void *v)
352 {
353         /* double cast to prevent GCC warning */
354         int idx = (int)(long)PDE_DATA(m->file->f_inode);
355         struct net_device *dev;
356         struct dev_rcv_lists *d;
357         struct net *net = m->private;
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 = net->can.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(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 
379 static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
380 {
381         return single_open_net(inode, file, can_rcvlist_proc_show);
382 }
383 
384 static 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 
392 static inline void can_rcvlist_proc_show_array(struct seq_file *m,
393                                                struct net_device *dev,
394                                                struct hlist_head *rcv_array,
395                                                unsigned int rcv_array_sz)
396 {
397         unsigned int i;
398         int all_empty = 1;
399 
400         /* check whether at least one list is non-empty */
401         for (i = 0; i < rcv_array_sz; i++)
402                 if (!hlist_empty(&rcv_array[i])) {
403                         all_empty = 0;
404                         break;
405                 }
406 
407         if (!all_empty) {
408                 can_print_recv_banner(m);
409                 for (i = 0; i < rcv_array_sz; i++) {
410                         if (!hlist_empty(&rcv_array[i]))
411                                 can_print_rcvlist(m, &rcv_array[i], dev);
412                 }
413         } else
414                 seq_printf(m, "  (%s: no entry)\n", DNAME(dev));
415 }
416 
417 static 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         struct net *net = m->private;
422 
423         /* RX_SFF */
424         seq_puts(m, "\nreceive list 'rx_sff':\n");
425 
426         rcu_read_lock();
427 
428         /* sff receive list for 'all' CAN devices (dev == NULL) */
429         d = net->can.can_rx_alldev_list;
430         can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
431 
432         /* sff receive list for registered CAN devices */
433         for_each_netdev_rcu(net, dev) {
434                 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
435                         d = dev->ml_priv;
436                         can_rcvlist_proc_show_array(m, dev, d->rx_sff,
437                                                     ARRAY_SIZE(d->rx_sff));
438                 }
439         }
440 
441         rcu_read_unlock();
442 
443         seq_putc(m, '\n');
444         return 0;
445 }
446 
447 static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
448 {
449         return single_open_net(inode, file, can_rcvlist_sff_proc_show);
450 }
451 
452 static const struct file_operations can_rcvlist_sff_proc_fops = {
453         .owner          = THIS_MODULE,
454         .open           = can_rcvlist_sff_proc_open,
455         .read           = seq_read,
456         .llseek         = seq_lseek,
457         .release        = single_release,
458 };
459 
460 
461 static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
462 {
463         struct net_device *dev;
464         struct dev_rcv_lists *d;
465         struct net *net = m->private;
466 
467         /* RX_EFF */
468         seq_puts(m, "\nreceive list 'rx_eff':\n");
469 
470         rcu_read_lock();
471 
472         /* eff receive list for 'all' CAN devices (dev == NULL) */
473         d = net->can.can_rx_alldev_list;
474         can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
475 
476         /* eff receive list for registered CAN devices */
477         for_each_netdev_rcu(net, dev) {
478                 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
479                         d = dev->ml_priv;
480                         can_rcvlist_proc_show_array(m, dev, d->rx_eff,
481                                                     ARRAY_SIZE(d->rx_eff));
482                 }
483         }
484 
485         rcu_read_unlock();
486 
487         seq_putc(m, '\n');
488         return 0;
489 }
490 
491 static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
492 {
493         return single_open_net(inode, file, can_rcvlist_eff_proc_show);
494 }
495 
496 static const struct file_operations can_rcvlist_eff_proc_fops = {
497         .owner          = THIS_MODULE,
498         .open           = can_rcvlist_eff_proc_open,
499         .read           = seq_read,
500         .llseek         = seq_lseek,
501         .release        = single_release,
502 };
503 
504 /*
505  * can_init_proc - create main CAN proc directory and procfs entries
506  */
507 void can_init_proc(struct net *net)
508 {
509         /* create /proc/net/can directory */
510         net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
511 
512         if (!net->can.proc_dir) {
513                 printk(KERN_INFO "can: failed to create /proc/net/can . "
514                            "CONFIG_PROC_FS missing?\n");
515                 return;
516         }
517 
518         /* own procfs entries from the AF_CAN core */
519         net->can.pde_version     = proc_create(CAN_PROC_VERSION, 0644,
520                                                net->can.proc_dir,
521                                                &can_version_proc_fops);
522         net->can.pde_stats       = proc_create(CAN_PROC_STATS, 0644,
523                                                net->can.proc_dir,
524                                                &can_stats_proc_fops);
525         net->can.pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644,
526                                                net->can.proc_dir,
527                                                &can_reset_stats_proc_fops);
528         net->can.pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644,
529                                                     net->can.proc_dir,
530                                                     &can_rcvlist_proc_fops,
531                                                     (void *)RX_ERR);
532         net->can.pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644,
533                                                     net->can.proc_dir,
534                                                     &can_rcvlist_proc_fops,
535                                                     (void *)RX_ALL);
536         net->can.pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644,
537                                                     net->can.proc_dir,
538                                                     &can_rcvlist_proc_fops,
539                                                     (void *)RX_FIL);
540         net->can.pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644,
541                                                     net->can.proc_dir,
542                                                     &can_rcvlist_proc_fops,
543                                                     (void *)RX_INV);
544         net->can.pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644,
545                                                net->can.proc_dir,
546                                                &can_rcvlist_eff_proc_fops);
547         net->can.pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644,
548                                                net->can.proc_dir,
549                                                &can_rcvlist_sff_proc_fops);
550 }
551 
552 /*
553  * can_remove_proc - remove procfs entries and main CAN proc directory
554  */
555 void can_remove_proc(struct net *net)
556 {
557         if (net->can.pde_version)
558                 remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
559 
560         if (net->can.pde_stats)
561                 remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
562 
563         if (net->can.pde_reset_stats)
564                 remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
565 
566         if (net->can.pde_rcvlist_err)
567                 remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
568 
569         if (net->can.pde_rcvlist_all)
570                 remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
571 
572         if (net->can.pde_rcvlist_fil)
573                 remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
574 
575         if (net->can.pde_rcvlist_inv)
576                 remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
577 
578         if (net->can.pde_rcvlist_eff)
579                 remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
580 
581         if (net->can.pde_rcvlist_sff)
582                 remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
583 
584         if (net->can.proc_dir)
585                 remove_proc_entry("can", net->proc_net);
586 }
587 

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