2 * proc.c - procfs support for Protocol family CAN core module
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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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.
24 * The provided data structures and external interfaces from this code
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44 #include <linux/module.h>
45 #include <linux/proc_fs.h>
46 #include <linux/list.h>
47 #include <linux/rcupdate.h>
48 #include <linux/can/core.h>
52 #include <linux/can/version.h> /* for RCSID. Removed by mkpatch script */
56 * proc filenames for the PF_CAN core
59 #define CAN_PROC_VERSION "version"
60 #define CAN_PROC_STATS "stats"
61 #define CAN_PROC_RESET_STATS "reset_stats"
62 #define CAN_PROC_RCVLIST_ALL "rcvlist_all"
63 #define CAN_PROC_RCVLIST_FIL "rcvlist_fil"
64 #define CAN_PROC_RCVLIST_INV "rcvlist_inv"
65 #define CAN_PROC_RCVLIST_SFF "rcvlist_sff"
66 #define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
67 #define CAN_PROC_RCVLIST_ERR "rcvlist_err"
69 static struct proc_dir_entry *can_dir;
70 static struct proc_dir_entry *pde_version;
71 static struct proc_dir_entry *pde_stats;
72 static struct proc_dir_entry *pde_reset_stats;
73 static struct proc_dir_entry *pde_rcvlist_all;
74 static struct proc_dir_entry *pde_rcvlist_fil;
75 static struct proc_dir_entry *pde_rcvlist_inv;
76 static struct proc_dir_entry *pde_rcvlist_sff;
77 static struct proc_dir_entry *pde_rcvlist_eff;
78 static struct proc_dir_entry *pde_rcvlist_err;
80 static int user_reset;
82 static const char rx_list_name[][8] = {
91 * af_can statistics stuff
94 static void can_init_stats(void)
97 * This memset function is called from a timer context (when
98 * stattimer is active which is the default) OR in a process
99 * context (reading the proc_fs when stattimer is disabled).
101 memset(&stats, 0, sizeof(stats));
102 stats.jiffies_init = jiffies;
104 pstats.stats_reset++;
112 static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
117 if (oldjif == newjif)
120 /* see can_stat_update() - this should NEVER happen! */
121 if (count > (ULONG_MAX / HZ)) {
122 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
127 rate = (count * HZ) / (newjif - oldjif);
132 void can_stat_update(unsigned long data)
134 unsigned long j = jiffies; /* snapshot */
136 /* restart counting in timer context on user request */
140 /* restart counting on jiffies overflow */
141 if (j < stats.jiffies_init)
144 /* prevent overflow in calc_rate() */
145 if (stats.rx_frames > (ULONG_MAX / HZ))
148 /* prevent overflow in calc_rate() */
149 if (stats.tx_frames > (ULONG_MAX / HZ))
152 /* matches overflow - very improbable */
153 if (stats.matches > (ULONG_MAX / 100))
156 /* calc total values */
158 stats.total_rx_match_ratio = (stats.matches * 100) /
161 stats.total_tx_rate = calc_rate(stats.jiffies_init, j,
163 stats.total_rx_rate = calc_rate(stats.jiffies_init, j,
166 /* calc current values */
167 if (stats.rx_frames_delta)
168 stats.current_rx_match_ratio =
169 (stats.matches_delta * 100) / stats.rx_frames_delta;
171 stats.current_tx_rate = calc_rate(0, HZ, stats.tx_frames_delta);
172 stats.current_rx_rate = calc_rate(0, HZ, stats.rx_frames_delta);
174 /* check / update maximum values */
175 if (stats.max_tx_rate < stats.current_tx_rate)
176 stats.max_tx_rate = stats.current_tx_rate;
178 if (stats.max_rx_rate < stats.current_rx_rate)
179 stats.max_rx_rate = stats.current_rx_rate;
181 if (stats.max_rx_match_ratio < stats.current_rx_match_ratio)
182 stats.max_rx_match_ratio = stats.current_rx_match_ratio;
184 /* clear values for 'current rate' calculation */
185 stats.tx_frames_delta = 0;
186 stats.rx_frames_delta = 0;
187 stats.matches_delta = 0;
189 /* restart timer (one second) */
190 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
191 mod_timer(&stattimer, round_jiffies(jiffies + HZ));
193 mod_timer(&stattimer, jiffies + HZ);
198 * proc read functions
200 * From known use-cases we expect about 10 entries in a receive list to be
201 * printed in the proc_fs. So PAGE_SIZE is definitely enough space here.
205 static int can_print_rcvlist(char *page, int len, struct hlist_head *rx_list,
206 struct net_device *dev)
209 struct hlist_node *n;
212 hlist_for_each_entry_rcu(r, n, rx_list, list) {
213 char *fmt = (r->can_id & CAN_EFF_FLAG)?
214 " %-5s %08X %08x %08x %08x %8ld %s\n" :
215 " %-5s %03X %08x %08lx %08lx %8ld %s\n";
217 len += snprintf(page + len, PAGE_SIZE - len, fmt,
218 DNAME(dev), r->can_id, r->mask,
219 (unsigned long)r->func, (unsigned long)r->data,
220 r->matches, r->ident);
222 /* does a typical line fit into the current buffer? */
224 /* 100 Bytes before end of buffer */
225 if (len > PAGE_SIZE - 100) {
226 /* mark output cut off */
227 len += snprintf(page + len, PAGE_SIZE - len,
237 static int can_print_recv_banner(char *page, int len)
240 * can1. 00000000 00000000 00000000
243 len += snprintf(page + len, PAGE_SIZE - len,
244 " device can_id can_mask function"
245 " userdata matches ident\n");
250 static int can_proc_read_stats(char *page, char **start, off_t off,
251 int count, int *eof, void *data)
255 len += snprintf(page + len, PAGE_SIZE - len, "\n");
256 len += snprintf(page + len, PAGE_SIZE - len,
257 " %8ld transmitted frames (TXF)\n", stats.tx_frames);
258 len += snprintf(page + len, PAGE_SIZE - len,
259 " %8ld received frames (RXF)\n", stats.rx_frames);
260 len += snprintf(page + len, PAGE_SIZE - len,
261 " %8ld matched frames (RXMF)\n", stats.matches);
263 len += snprintf(page + len, PAGE_SIZE - len, "\n");
265 if (stattimer.function == can_stat_update) {
266 len += snprintf(page + len, PAGE_SIZE - len,
267 " %8ld %% total match ratio (RXMR)\n",
268 stats.total_rx_match_ratio);
270 len += snprintf(page + len, PAGE_SIZE - len,
271 " %8ld frames/s total tx rate (TXR)\n",
272 stats.total_tx_rate);
273 len += snprintf(page + len, PAGE_SIZE - len,
274 " %8ld frames/s total rx rate (RXR)\n",
275 stats.total_rx_rate);
277 len += snprintf(page + len, PAGE_SIZE - len, "\n");
279 len += snprintf(page + len, PAGE_SIZE - len,
280 " %8ld %% current match ratio (CRXMR)\n",
281 stats.current_rx_match_ratio);
283 len += snprintf(page + len, PAGE_SIZE - len,
284 " %8ld frames/s current tx rate (CTXR)\n",
285 stats.current_tx_rate);
286 len += snprintf(page + len, PAGE_SIZE - len,
287 " %8ld frames/s current rx rate (CRXR)\n",
288 stats.current_rx_rate);
290 len += snprintf(page + len, PAGE_SIZE - len, "\n");
292 len += snprintf(page + len, PAGE_SIZE - len,
293 " %8ld %% max match ratio (MRXMR)\n",
294 stats.max_rx_match_ratio);
296 len += snprintf(page + len, PAGE_SIZE - len,
297 " %8ld frames/s max tx rate (MTXR)\n",
299 len += snprintf(page + len, PAGE_SIZE - len,
300 " %8ld frames/s max rx rate (MRXR)\n",
303 len += snprintf(page + len, PAGE_SIZE - len, "\n");
306 len += snprintf(page + len, PAGE_SIZE - len,
307 " %8ld current receive list entries (CRCV)\n",
309 len += snprintf(page + len, PAGE_SIZE - len,
310 " %8ld maximum receive list entries (MRCV)\n",
311 pstats.rcv_entries_max);
313 if (pstats.stats_reset)
314 len += snprintf(page + len, PAGE_SIZE - len,
315 "\n %8ld statistic resets (STR)\n",
318 if (pstats.user_reset)
319 len += snprintf(page + len, PAGE_SIZE - len,
320 " %8ld user statistic resets (USTR)\n",
323 len += snprintf(page + len, PAGE_SIZE - len, "\n");
329 static int can_proc_read_reset_stats(char *page, char **start, off_t off,
330 int count, int *eof, void *data)
336 if (stattimer.function == can_stat_update) {
337 len += snprintf(page + len, PAGE_SIZE - len,
338 "Scheduled statistic reset #%ld.\n",
339 pstats.stats_reset + 1);
342 if (stats.jiffies_init != jiffies)
345 len += snprintf(page + len, PAGE_SIZE - len,
346 "Performed statistic reset #%ld.\n",
354 static int can_proc_read_version(char *page, char **start, off_t off,
355 int count, int *eof, void *data)
359 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
365 static int can_proc_read_rcvlist(char *page, char **start, off_t off,
366 int count, int *eof, void *data)
368 /* double cast to prevent GCC warning */
369 int idx = (int)(long)data;
371 struct dev_rcv_lists *d;
372 struct hlist_node *n;
374 len += snprintf(page + len, PAGE_SIZE - len,
375 "\nreceive list '%s':\n", rx_list_name[idx]);
378 hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
380 if (!hlist_empty(&d->rx[idx])) {
381 len = can_print_recv_banner(page, len);
382 len = can_print_rcvlist(page, len, &d->rx[idx], d->dev);
384 len += snprintf(page + len, PAGE_SIZE - len,
385 " (%s: no entry)\n", DNAME(d->dev));
387 /* exit on end of buffer? */
388 if (len > PAGE_SIZE - 100)
393 len += snprintf(page + len, PAGE_SIZE - len, "\n");
399 static int can_proc_read_rcvlist_sff(char *page, char **start, off_t off,
400 int count, int *eof, void *data)
403 struct dev_rcv_lists *d;
404 struct hlist_node *n;
407 len += snprintf(page + len, PAGE_SIZE - len,
408 "\nreceive list 'rx_sff':\n");
411 hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
412 int i, all_empty = 1;
413 /* check wether at least one list is non-empty */
414 for (i = 0; i < 0x800; i++)
415 if (!hlist_empty(&d->rx_sff[i])) {
421 len = can_print_recv_banner(page, len);
422 for (i = 0; i < 0x800; i++) {
423 if (!hlist_empty(&d->rx_sff[i]) &&
424 len < PAGE_SIZE - 100)
425 len = can_print_rcvlist(page, len,
430 len += snprintf(page + len, PAGE_SIZE - len,
431 " (%s: no entry)\n", DNAME(d->dev));
433 /* exit on end of buffer? */
434 if (len > PAGE_SIZE - 100)
439 len += snprintf(page + len, PAGE_SIZE - len, "\n");
446 * proc utility functions
449 static struct proc_dir_entry *can_create_proc_readentry(const char *name,
451 read_proc_t *read_proc,
455 return create_proc_read_entry(name, mode, can_dir, read_proc,
461 static void can_remove_proc_readentry(const char *name)
464 remove_proc_entry(name, can_dir);
468 * can_init_proc - create main CAN proc directory and procfs entries
470 void can_init_proc(void)
472 /* create /proc/net/can directory */
473 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
474 can_dir = proc_mkdir("can", init_net.proc_net);
476 can_dir = proc_mkdir("can", proc_net);
480 printk(KERN_INFO "can: failed to create /proc/net/can . "
481 "CONFIG_PROC_FS missing?\n");
485 can_dir->owner = THIS_MODULE;
487 /* own procfs entries from the AF_CAN core */
488 pde_version = can_create_proc_readentry(CAN_PROC_VERSION, 0644,
489 can_proc_read_version, NULL);
490 pde_stats = can_create_proc_readentry(CAN_PROC_STATS, 0644,
491 can_proc_read_stats, NULL);
492 pde_reset_stats = can_create_proc_readentry(CAN_PROC_RESET_STATS, 0644,
493 can_proc_read_reset_stats, NULL);
494 pde_rcvlist_err = can_create_proc_readentry(CAN_PROC_RCVLIST_ERR, 0644,
495 can_proc_read_rcvlist, (void *)RX_ERR);
496 pde_rcvlist_all = can_create_proc_readentry(CAN_PROC_RCVLIST_ALL, 0644,
497 can_proc_read_rcvlist, (void *)RX_ALL);
498 pde_rcvlist_fil = can_create_proc_readentry(CAN_PROC_RCVLIST_FIL, 0644,
499 can_proc_read_rcvlist, (void *)RX_FIL);
500 pde_rcvlist_inv = can_create_proc_readentry(CAN_PROC_RCVLIST_INV, 0644,
501 can_proc_read_rcvlist, (void *)RX_INV);
502 pde_rcvlist_eff = can_create_proc_readentry(CAN_PROC_RCVLIST_EFF, 0644,
503 can_proc_read_rcvlist, (void *)RX_EFF);
504 pde_rcvlist_sff = can_create_proc_readentry(CAN_PROC_RCVLIST_SFF, 0644,
505 can_proc_read_rcvlist_sff, NULL);
509 * can_remove_proc - remove procfs entries and main CAN proc directory
511 void can_remove_proc(void)
514 can_remove_proc_readentry(CAN_PROC_VERSION);
517 can_remove_proc_readentry(CAN_PROC_STATS);
520 can_remove_proc_readentry(CAN_PROC_RESET_STATS);
523 can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
526 can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
529 can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
532 can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
535 can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
538 can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
541 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
542 proc_net_remove(&init_net, "can");
544 proc_net_remove("can");