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v3.5.6
  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
 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/* receive filters subscribed for 'all' CAN devices */
 87extern struct dev_rcv_lists can_rx_alldev_list;
 88
 89/*
 90 * af_can statistics stuff
 91 */
 92
 93static void can_init_stats(void)
 94{
 
 
 95	/*
 96	 * This memset function is called from a timer context (when
 97	 * can_stattimer is active which is the default) OR in a process
 98	 * context (reading the proc_fs when can_stattimer is disabled).
 99	 */
100	memset(&can_stats, 0, sizeof(can_stats));
101	can_stats.jiffies_init = jiffies;
102
103	can_pstats.stats_reset++;
104
105	if (user_reset) {
106		user_reset = 0;
107		can_pstats.user_reset++;
108	}
109}
110
111static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
112			       unsigned long count)
113{
114	unsigned long rate;
115
116	if (oldjif == newjif)
117		return 0;
118
119	/* see can_stat_update() - this should NEVER happen! */
120	if (count > (ULONG_MAX / HZ)) {
121		printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n",
122		       count);
123		return 99999999;
124	}
125
126	rate = (count * HZ) / (newjif - oldjif);
127
128	return rate;
129}
130
131void can_stat_update(unsigned long data)
132{
 
 
133	unsigned long j = jiffies; /* snapshot */
134
135	/* restart counting in timer context on user request */
136	if (user_reset)
137		can_init_stats();
138
139	/* restart counting on jiffies overflow */
140	if (j < can_stats.jiffies_init)
141		can_init_stats();
142
143	/* prevent overflow in calc_rate() */
144	if (can_stats.rx_frames > (ULONG_MAX / HZ))
145		can_init_stats();
146
147	/* prevent overflow in calc_rate() */
148	if (can_stats.tx_frames > (ULONG_MAX / HZ))
149		can_init_stats();
150
151	/* matches overflow - very improbable */
152	if (can_stats.matches > (ULONG_MAX / 100))
153		can_init_stats();
154
155	/* calc total values */
156	if (can_stats.rx_frames)
157		can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
158			can_stats.rx_frames;
159
160	can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j,
161					    can_stats.tx_frames);
162	can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j,
163					    can_stats.rx_frames);
164
165	/* calc current values */
166	if (can_stats.rx_frames_delta)
167		can_stats.current_rx_match_ratio =
168			(can_stats.matches_delta * 100) /
169			can_stats.rx_frames_delta;
170
171	can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta);
172	can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta);
173
174	/* check / update maximum values */
175	if (can_stats.max_tx_rate < can_stats.current_tx_rate)
176		can_stats.max_tx_rate = can_stats.current_tx_rate;
177
178	if (can_stats.max_rx_rate < can_stats.current_rx_rate)
179		can_stats.max_rx_rate = can_stats.current_rx_rate;
180
181	if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio)
182		can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio;
183
184	/* clear values for 'current rate' calculation */
185	can_stats.tx_frames_delta = 0;
186	can_stats.rx_frames_delta = 0;
187	can_stats.matches_delta   = 0;
188
189	/* restart timer (one second) */
190	mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
191}
192
193/*
194 * proc read functions
195 */
196
197static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
198			      struct net_device *dev)
199{
200	struct receiver *r;
201	struct hlist_node *n;
202
203	hlist_for_each_entry_rcu(r, n, rx_list, list) {
204		char *fmt = (r->can_id & CAN_EFF_FLAG)?
205			"   %-5s  %08x  %08x  %pK  %pK  %8ld  %s\n" :
206			"   %-5s     %03x    %08x  %pK  %pK  %8ld  %s\n";
207
208		seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
209				r->func, r->data, r->matches, r->ident);
210	}
211}
212
213static void can_print_recv_banner(struct seq_file *m)
214{
215	/*
216	 *                  can1.  00000000  00000000  00000000
217	 *                 .......          0  tp20
218	 */
219	seq_puts(m, "  device   can_id   can_mask  function"
220			"  userdata   matches  ident\n");
221}
222
223static int can_stats_proc_show(struct seq_file *m, void *v)
224{
 
 
 
 
225	seq_putc(m, '\n');
226	seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames);
227	seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames);
228	seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches);
229
230	seq_putc(m, '\n');
231
232	if (can_stattimer.function == can_stat_update) {
233		seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
234				can_stats.total_rx_match_ratio);
235
236		seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
237				can_stats.total_tx_rate);
238		seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
239				can_stats.total_rx_rate);
240
241		seq_putc(m, '\n');
242
243		seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
244				can_stats.current_rx_match_ratio);
245
246		seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
247				can_stats.current_tx_rate);
248		seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
249				can_stats.current_rx_rate);
250
251		seq_putc(m, '\n');
252
253		seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
254				can_stats.max_rx_match_ratio);
255
256		seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
257				can_stats.max_tx_rate);
258		seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
259				can_stats.max_rx_rate);
260
261		seq_putc(m, '\n');
262	}
263
264	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
265			can_pstats.rcv_entries);
266	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
267			can_pstats.rcv_entries_max);
268
269	if (can_pstats.stats_reset)
270		seq_printf(m, "\n %8ld statistic resets (STR)\n",
271				can_pstats.stats_reset);
272
273	if (can_pstats.user_reset)
274		seq_printf(m, " %8ld user statistic resets (USTR)\n",
275				can_pstats.user_reset);
276
277	seq_putc(m, '\n');
278	return 0;
279}
280
281static int can_stats_proc_open(struct inode *inode, struct file *file)
282{
283	return single_open(file, can_stats_proc_show, NULL);
284}
285
286static const struct file_operations can_stats_proc_fops = {
287	.owner		= THIS_MODULE,
288	.open		= can_stats_proc_open,
289	.read		= seq_read,
290	.llseek		= seq_lseek,
291	.release	= single_release,
292};
293
294static int can_reset_stats_proc_show(struct seq_file *m, void *v)
295{
 
 
 
 
296	user_reset = 1;
297
298	if (can_stattimer.function == can_stat_update) {
299		seq_printf(m, "Scheduled statistic reset #%ld.\n",
300				can_pstats.stats_reset + 1);
301
302	} else {
303		if (can_stats.jiffies_init != jiffies)
304			can_init_stats();
305
306		seq_printf(m, "Performed statistic reset #%ld.\n",
307				can_pstats.stats_reset);
308	}
309	return 0;
310}
311
312static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
313{
314	return single_open(file, can_reset_stats_proc_show, NULL);
315}
316
317static const struct file_operations can_reset_stats_proc_fops = {
318	.owner		= THIS_MODULE,
319	.open		= can_reset_stats_proc_open,
320	.read		= seq_read,
321	.llseek		= seq_lseek,
322	.release	= single_release,
323};
324
325static int can_version_proc_show(struct seq_file *m, void *v)
326{
327	seq_printf(m, "%s\n", CAN_VERSION_STRING);
328	return 0;
329}
330
331static int can_version_proc_open(struct inode *inode, struct file *file)
332{
333	return single_open(file, can_version_proc_show, NULL);
334}
335
336static const struct file_operations can_version_proc_fops = {
337	.owner		= THIS_MODULE,
338	.open		= can_version_proc_open,
339	.read		= seq_read,
340	.llseek		= seq_lseek,
341	.release	= single_release,
342};
343
344static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
345					     struct net_device *dev,
346					     struct dev_rcv_lists *d)
347{
348	if (!hlist_empty(&d->rx[idx])) {
349		can_print_recv_banner(m);
350		can_print_rcvlist(m, &d->rx[idx], dev);
351	} else
352		seq_printf(m, "  (%s: no entry)\n", DNAME(dev));
353
354}
355
356static int can_rcvlist_proc_show(struct seq_file *m, void *v)
357{
358	/* double cast to prevent GCC warning */
359	int idx = (int)(long)m->private;
360	struct net_device *dev;
361	struct dev_rcv_lists *d;
 
362
363	seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
364
365	rcu_read_lock();
366
367	/* receive list for 'all' CAN devices (dev == NULL) */
368	d = &can_rx_alldev_list;
369	can_rcvlist_proc_show_one(m, idx, NULL, d);
370
371	/* receive list for registered CAN devices */
372	for_each_netdev_rcu(&init_net, dev) {
373		if (dev->type == ARPHRD_CAN && dev->ml_priv)
374			can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
375	}
376
377	rcu_read_unlock();
378
379	seq_putc(m, '\n');
380	return 0;
381}
382
383static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
384{
385	return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
386}
387
388static const struct file_operations can_rcvlist_proc_fops = {
389	.owner		= THIS_MODULE,
390	.open		= can_rcvlist_proc_open,
391	.read		= seq_read,
392	.llseek		= seq_lseek,
393	.release	= single_release,
394};
395
396static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
397						 struct net_device *dev,
398						 struct dev_rcv_lists *d)
 
399{
400	int i;
401	int all_empty = 1;
402
403	/* check wether at least one list is non-empty */
404	for (i = 0; i < 0x800; i++)
405		if (!hlist_empty(&d->rx_sff[i])) {
406			all_empty = 0;
407			break;
408		}
409
410	if (!all_empty) {
411		can_print_recv_banner(m);
412		for (i = 0; i < 0x800; i++) {
413			if (!hlist_empty(&d->rx_sff[i]))
414				can_print_rcvlist(m, &d->rx_sff[i], dev);
415		}
416	} else
417		seq_printf(m, "  (%s: no entry)\n", DNAME(dev));
418}
419
420static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
421{
422	struct net_device *dev;
423	struct dev_rcv_lists *d;
 
424
425	/* RX_SFF */
426	seq_puts(m, "\nreceive list 'rx_sff':\n");
427
428	rcu_read_lock();
429
430	/* sff receive list for 'all' CAN devices (dev == NULL) */
431	d = &can_rx_alldev_list;
432	can_rcvlist_sff_proc_show_one(m, NULL, d);
433
434	/* sff receive list for registered CAN devices */
435	for_each_netdev_rcu(&init_net, dev) {
436		if (dev->type == ARPHRD_CAN && dev->ml_priv)
437			can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
 
 
 
438	}
439
440	rcu_read_unlock();
441
442	seq_putc(m, '\n');
443	return 0;
444}
445
446static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
447{
448	return single_open(file, can_rcvlist_sff_proc_show, NULL);
449}
450
451static const struct file_operations can_rcvlist_sff_proc_fops = {
452	.owner		= THIS_MODULE,
453	.open		= can_rcvlist_sff_proc_open,
454	.read		= seq_read,
455	.llseek		= seq_lseek,
456	.release	= single_release,
457};
458
459/*
460 * proc utility functions
461 */
462
463static void can_remove_proc_readentry(const char *name)
464{
465	if (can_dir)
466		remove_proc_entry(name, can_dir);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
467}
468
 
 
 
 
 
 
 
469/*
470 * can_init_proc - create main CAN proc directory and procfs entries
471 */
472void can_init_proc(void)
473{
474	/* create /proc/net/can directory */
475	can_dir = proc_mkdir("can", init_net.proc_net);
476
477	if (!can_dir) {
478		printk(KERN_INFO "can: failed to create /proc/net/can . "
479		       "CONFIG_PROC_FS missing?\n");
480		return;
481	}
482
483	/* own procfs entries from the AF_CAN core */
484	pde_version     = proc_create(CAN_PROC_VERSION, 0644, can_dir,
485				      &can_version_proc_fops);
486	pde_stats       = proc_create(CAN_PROC_STATS, 0644, can_dir,
487				      &can_stats_proc_fops);
488	pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir,
489				      &can_reset_stats_proc_fops);
490	pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir,
491					   &can_rcvlist_proc_fops, (void *)RX_ERR);
492	pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir,
493					   &can_rcvlist_proc_fops, (void *)RX_ALL);
494	pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir,
495					   &can_rcvlist_proc_fops, (void *)RX_FIL);
496	pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir,
497					   &can_rcvlist_proc_fops, (void *)RX_INV);
498	pde_rcvlist_eff = proc_create_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
499					   &can_rcvlist_proc_fops, (void *)RX_EFF);
500	pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
501				      &can_rcvlist_sff_proc_fops);
 
 
 
 
 
 
 
 
 
 
 
 
 
502}
503
504/*
505 * can_remove_proc - remove procfs entries and main CAN proc directory
506 */
507void can_remove_proc(void)
508{
509	if (pde_version)
510		can_remove_proc_readentry(CAN_PROC_VERSION);
511
512	if (pde_stats)
513		can_remove_proc_readentry(CAN_PROC_STATS);
514
515	if (pde_reset_stats)
516		can_remove_proc_readentry(CAN_PROC_RESET_STATS);
517
518	if (pde_rcvlist_err)
519		can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
520
521	if (pde_rcvlist_all)
522		can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
523
524	if (pde_rcvlist_fil)
525		can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
526
527	if (pde_rcvlist_inv)
528		can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
529
530	if (pde_rcvlist_eff)
531		can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
532
533	if (pde_rcvlist_sff)
534		can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
535
536	if (can_dir)
537		proc_net_remove(&init_net, "can");
538}
v4.17
  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
 
 
 
 
 
 
 
 
 
 
 
 65static int user_reset;
 66
 67static 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
 78static 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
 98static 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
118void 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
186static 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
201static 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
211static 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
273static 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
278static 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
285static 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
306static 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
311static 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
318static 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
324static 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
329static 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
336static 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
348static 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
376static 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
381static 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
388static 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
413static 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
443static 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
448static 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
456static 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
486static 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
491static 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 */
501void 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 */
549void 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}