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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 struct proc_dir_entry *can_dir;
 66 static struct proc_dir_entry *pde_version;
 67 static struct proc_dir_entry *pde_stats;
 68 static struct proc_dir_entry *pde_reset_stats;
 69 static struct proc_dir_entry *pde_rcvlist_all;
 70 static struct proc_dir_entry *pde_rcvlist_fil;
 71 static struct proc_dir_entry *pde_rcvlist_inv;
 72 static struct proc_dir_entry *pde_rcvlist_sff;
 73 static struct proc_dir_entry *pde_rcvlist_eff;
 74 static struct proc_dir_entry *pde_rcvlist_err;
 75 
 76 static int user_reset;
 77 
 78 static 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 };
 84 
 85 /*
 86  * af_can statistics stuff
 87  */
 88 
 89 static void can_init_stats(void)
 90 {
 91         /*
 92          * This memset function is called from a timer context (when
 93          * can_stattimer is active which is the default) OR in a process
 94          * context (reading the proc_fs when can_stattimer is disabled).
 95          */
 96         memset(&can_stats, 0, sizeof(can_stats));
 97         can_stats.jiffies_init = jiffies;
 98 
 99         can_pstats.stats_reset++;
100 
101         if (user_reset) {
102                 user_reset = 0;
103                 can_pstats.user_reset++;
104         }
105 }
106 
107 static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
108                                unsigned long count)
109 {
110         unsigned long rate;
111 
112         if (oldjif == newjif)
113                 return 0;
114 
115         /* see can_stat_update() - this should NEVER happen! */
116         if (count > (ULONG_MAX / HZ)) {
117                 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
118                        count);
119                 return 99999999;
120         }
121 
122         rate = (count * HZ) / (newjif - oldjif);
123 
124         return rate;
125 }
126 
127 void can_stat_update(unsigned long data)
128 {
129         unsigned long j = jiffies; /* snapshot */
130 
131         /* restart counting in timer context on user request */
132         if (user_reset)
133                 can_init_stats();
134 
135         /* restart counting on jiffies overflow */
136         if (j < can_stats.jiffies_init)
137                 can_init_stats();
138 
139         /* prevent overflow in calc_rate() */
140         if (can_stats.rx_frames > (ULONG_MAX / HZ))
141                 can_init_stats();
142 
143         /* prevent overflow in calc_rate() */
144         if (can_stats.tx_frames > (ULONG_MAX / HZ))
145                 can_init_stats();
146 
147         /* matches overflow - very improbable */
148         if (can_stats.matches > (ULONG_MAX / 100))
149                 can_init_stats();
150 
151         /* calc total values */
152         if (can_stats.rx_frames)
153                 can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
154                         can_stats.rx_frames;
155 
156         can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
157                                             can_stats.tx_frames);
158         can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
159                                             can_stats.rx_frames);
160 
161         /* calc current values */
162         if (can_stats.rx_frames_delta)
163                 can_stats.current_rx_match_ratio =
164                         (can_stats.matches_delta * 100) /
165                         can_stats.rx_frames_delta;
166 
167         can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
168         can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
169 
170         /* check / update maximum values */
171         if (can_stats.max_tx_rate < can_stats.current_tx_rate)
172                 can_stats.max_tx_rate = can_stats.current_tx_rate;
173 
174         if (can_stats.max_rx_rate < can_stats.current_rx_rate)
175                 can_stats.max_rx_rate = can_stats.current_rx_rate;
176 
177         if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
178                 can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
179 
180         /* clear values for 'current rate' calculation */
181         can_stats.tx_frames_delta = 0;
182         can_stats.rx_frames_delta = 0;
183         can_stats.matches_delta   = 0;
184 
185         /* restart timer (one second) */
186         mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
187 }
188 
189 /*
190  * proc read functions
191  */
192 
193 static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
194                               struct net_device *dev)
195 {
196         struct receiver *r;
197 
198         hlist_for_each_entry_rcu(r, rx_list, list) {
199                 char *fmt = (r->can_id & CAN_EFF_FLAG)?
200                         "   %-5s  %08x  %08x  %pK  %pK  %8ld  %s\n" :
201                         "   %-5s     %03x    %08x  %pK  %pK  %8ld  %s\n";
202 
203                 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
204                                 r->func, r->data, r->matches, r->ident);
205         }
206 }
207 
208 static void can_print_recv_banner(struct seq_file *m)
209 {
210         /*
211          *                  can1.  00000000  00000000  00000000
212          *                 .......          0  tp20
213          */
214         seq_puts(m, "  device   can_id   can_mask  function"
215                         "  userdata   matches  ident\n");
216 }
217 
218 static int can_stats_proc_show(struct seq_file *m, void *v)
219 {
220         seq_putc(m, '\n');
221         seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
222         seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
223         seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
224 
225         seq_putc(m, '\n');
226 
227         if (can_stattimer.function == can_stat_update) {
228                 seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
229                                 can_stats.total_rx_match_ratio);
230 
231                 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
232                                 can_stats.total_tx_rate);
233                 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
234                                 can_stats.total_rx_rate);
235 
236                 seq_putc(m, '\n');
237 
238                 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
239                                 can_stats.current_rx_match_ratio);
240 
241                 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
242                                 can_stats.current_tx_rate);
243                 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
244                                 can_stats.current_rx_rate);
245 
246                 seq_putc(m, '\n');
247 
248                 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
249                                 can_stats.max_rx_match_ratio);
250 
251                 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
252                                 can_stats.max_tx_rate);
253                 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
254                                 can_stats.max_rx_rate);
255 
256                 seq_putc(m, '\n');
257         }
258 
259         seq_printf(m, " %8ld current receive list entries (CRCV)\n",
260                         can_pstats.rcv_entries);
261         seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
262                         can_pstats.rcv_entries_max);
263 
264         if (can_pstats.stats_reset)
265                 seq_printf(m, "\n %8ld statistic resets (STR)\n",
266                                 can_pstats.stats_reset);
267 
268         if (can_pstats.user_reset)
269                 seq_printf(m, " %8ld user statistic resets (USTR)\n",
270                                 can_pstats.user_reset);
271 
272         seq_putc(m, '\n');
273         return 0;
274 }
275 
276 static int can_stats_proc_open(struct inode *inode, struct file *file)
277 {
278         return single_open(file, can_stats_proc_show, NULL);
279 }
280 
281 static const struct file_operations can_stats_proc_fops = {
282         .owner          = THIS_MODULE,
283         .open           = can_stats_proc_open,
284         .read           = seq_read,
285         .llseek         = seq_lseek,
286         .release        = single_release,
287 };
288 
289 static int can_reset_stats_proc_show(struct seq_file *m, void *v)
290 {
291         user_reset = 1;
292 
293         if (can_stattimer.function == can_stat_update) {
294                 seq_printf(m, "Scheduled statistic reset #%ld.\n",
295                                 can_pstats.stats_reset + 1);
296 
297         } else {
298                 if (can_stats.jiffies_init != jiffies)
299                         can_init_stats();
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(file, can_reset_stats_proc_show, NULL);
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(file, can_version_proc_show, NULL);
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)m->private;
355         struct net_device *dev;
356         struct dev_rcv_lists *d;
357 
358         seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
359 
360         rcu_read_lock();
361 
362         /* receive list for 'all' CAN devices (dev == NULL) */
363         d = &can_rx_alldev_list;
364         can_rcvlist_proc_show_one(m, idx, NULL, d);
365 
366         /* receive list for registered CAN devices */
367         for_each_netdev_rcu(&init_net, dev) {
368                 if (dev->type == ARPHRD_CAN && dev->ml_priv)
369                         can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
370         }
371 
372         rcu_read_unlock();
373 
374         seq_putc(m, '\n');
375         return 0;
376 }
377 
378 static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
379 {
380         return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode));
381 }
382 
383 static const struct file_operations can_rcvlist_proc_fops = {
384         .owner          = THIS_MODULE,
385         .open           = can_rcvlist_proc_open,
386         .read           = seq_read,
387         .llseek         = seq_lseek,
388         .release        = single_release,
389 };
390 
391 static inline void can_rcvlist_proc_show_array(struct seq_file *m,
392                                                struct net_device *dev,
393                                                struct hlist_head *rcv_array,
394                                                unsigned int rcv_array_sz)
395 {
396         unsigned int i;
397         int all_empty = 1;
398 
399         /* check whether at least one list is non-empty */
400         for (i = 0; i < rcv_array_sz; i++)
401                 if (!hlist_empty(&rcv_array[i])) {
402                         all_empty = 0;
403                         break;
404                 }
405 
406         if (!all_empty) {
407                 can_print_recv_banner(m);
408                 for (i = 0; i < rcv_array_sz; i++) {
409                         if (!hlist_empty(&rcv_array[i]))
410                                 can_print_rcvlist(m, &rcv_array[i], dev);
411                 }
412         } else
413                 seq_printf(m, "  (%s: no entry)\n", DNAME(dev));
414 }
415 
416 static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
417 {
418         struct net_device *dev;
419         struct dev_rcv_lists *d;
420 
421         /* RX_SFF */
422         seq_puts(m, "\nreceive list 'rx_sff':\n");
423 
424         rcu_read_lock();
425 
426         /* sff receive list for 'all' CAN devices (dev == NULL) */
427         d = &can_rx_alldev_list;
428         can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff));
429 
430         /* sff receive list for registered CAN devices */
431         for_each_netdev_rcu(&init_net, dev) {
432                 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
433                         d = dev->ml_priv;
434                         can_rcvlist_proc_show_array(m, dev, d->rx_sff,
435                                                     ARRAY_SIZE(d->rx_sff));
436                 }
437         }
438 
439         rcu_read_unlock();
440 
441         seq_putc(m, '\n');
442         return 0;
443 }
444 
445 static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
446 {
447         return single_open(file, can_rcvlist_sff_proc_show, NULL);
448 }
449 
450 static const struct file_operations can_rcvlist_sff_proc_fops = {
451         .owner          = THIS_MODULE,
452         .open           = can_rcvlist_sff_proc_open,
453         .read           = seq_read,
454         .llseek         = seq_lseek,
455         .release        = single_release,
456 };
457 
458 
459 static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v)
460 {
461         struct net_device *dev;
462         struct dev_rcv_lists *d;
463 
464         /* RX_EFF */
465         seq_puts(m, "\nreceive list 'rx_eff':\n");
466 
467         rcu_read_lock();
468 
469         /* eff receive list for 'all' CAN devices (dev == NULL) */
470         d = &can_rx_alldev_list;
471         can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff));
472 
473         /* eff receive list for registered CAN devices */
474         for_each_netdev_rcu(&init_net, dev) {
475                 if (dev->type == ARPHRD_CAN && dev->ml_priv) {
476                         d = dev->ml_priv;
477                         can_rcvlist_proc_show_array(m, dev, d->rx_eff,
478                                                     ARRAY_SIZE(d->rx_eff));
479                 }
480         }
481 
482         rcu_read_unlock();
483 
484         seq_putc(m, '\n');
485         return 0;
486 }
487 
488 static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file)
489 {
490         return single_open(file, can_rcvlist_eff_proc_show, NULL);
491 }
492 
493 static const struct file_operations can_rcvlist_eff_proc_fops = {
494         .owner          = THIS_MODULE,
495         .open           = can_rcvlist_eff_proc_open,
496         .read           = seq_read,
497         .llseek         = seq_lseek,
498         .release        = single_release,
499 };
500 
501 /*
502  * proc utility functions
503  */
504 
505 static void can_remove_proc_readentry(const char *name)
506 {
507         if (can_dir)
508                 remove_proc_entry(name, can_dir);
509 }
510 
511 /*
512  * can_init_proc - create main CAN proc directory and procfs entries
513  */
514 void can_init_proc(void)
515 {
516         /* create /proc/net/can directory */
517         can_dir = proc_mkdir("can", init_net.proc_net);
518 
519         if (!can_dir) {
520                 printk(KERN_INFO "can: failed to create /proc/net/can . "
521                        "CONFIG_PROC_FS missing?\n");
522                 return;
523         }
524 
525         /* own procfs entries from the AF_CAN core */
526         pde_version     = proc_create(CAN_PROC_VERSION, 0644, can_dir,
527                                       &can_version_proc_fops);
528         pde_stats       = proc_create(CAN_PROC_STATS, 0644, can_dir,
529                                       &can_stats_proc_fops);
530         pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
531                                       &can_reset_stats_proc_fops);
532         pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
533                                            &can_rcvlist_proc_fops, (void *)RX_ERR);
534         pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
535                                            &can_rcvlist_proc_fops, (void *)RX_ALL);
536         pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
537                                            &can_rcvlist_proc_fops, (void *)RX_FIL);
538         pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
539                                            &can_rcvlist_proc_fops, (void *)RX_INV);
540         pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
541                                       &can_rcvlist_eff_proc_fops);
542         pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_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(void)
550 {
551         if (pde_version)
552                 can_remove_proc_readentry(CAN_PROC_VERSION);
553 
554         if (pde_stats)
555                 can_remove_proc_readentry(CAN_PROC_STATS);
556 
557         if (pde_reset_stats)
558                 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
559 
560         if (pde_rcvlist_err)
561                 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
562 
563         if (pde_rcvlist_all)
564                 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
565 
566         if (pde_rcvlist_fil)
567                 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
568 
569         if (pde_rcvlist_inv)
570                 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
571 
572         if (pde_rcvlist_eff)
573                 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
574 
575         if (pde_rcvlist_sff)
576                 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
577 
578         if (can_dir)
579                 remove_proc_entry("can", init_net.proc_net);
580 }
581 

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