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

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         .open           = can_stats_proc_open,
280         .read           = seq_read,
281         .llseek         = seq_lseek,
282         .release        = single_release,
283 };
284 
285 static 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 
306 static 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 
311 static 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 
318 static 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 
324 static 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 
329 static 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 
336 static 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 
348 static 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 
376 static 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 
381 static 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 
388 static 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 
413 static 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 
443 static 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 
448 static 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 
456 static 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 
486 static 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 
491 static 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  */
501 void 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  */
549 void 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 }
581 

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