1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright 2012 Cisco Systems, Inc. All rights reserved.
3
4 #include <linux/module.h>
5 #include <linux/errno.h>
6 #include <linux/debugfs.h>
7 #include <linux/vmalloc.h>
8 #include "fnic.h"
9
10 extern int fnic_get_debug_info(struct stats_debug_info *debug_buffer,
11 struct fnic *fnic);
12
13 static struct dentry *fnic_trace_debugfs_root;
14 static struct dentry *fnic_trace_debugfs_file;
15 static struct dentry *fnic_trace_enable;
16 static struct dentry *fnic_stats_debugfs_root;
17
18 static struct dentry *fnic_fc_trace_debugfs_file;
19 static struct dentry *fnic_fc_rdata_trace_debugfs_file;
20 static struct dentry *fnic_fc_trace_enable;
21 static struct dentry *fnic_fc_trace_clear;
22
23 struct fc_trace_flag_type {
24 u8 fc_row_file;
25 u8 fc_normal_file;
26 u8 fnic_trace;
27 u8 fc_trace;
28 u8 fc_clear;
29 };
30
31 static struct fc_trace_flag_type *fc_trc_flag;
32
33 /*
34 * fnic_debugfs_init - Initialize debugfs for fnic debug logging
35 *
36 * Description:
37 * When Debugfs is configured this routine sets up the fnic debugfs
38 * file system. If not already created, this routine will create the
39 * fnic directory and statistics directory for trace buffer and
40 * stats logging.
41 */
fnic_debugfs_init(void)42 int fnic_debugfs_init(void)
43 {
44 fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
45
46 fnic_stats_debugfs_root = debugfs_create_dir("statistics",
47 fnic_trace_debugfs_root);
48
49 /* Allocate memory to structure */
50 fc_trc_flag = vmalloc(sizeof(struct fc_trace_flag_type));
51
52 if (fc_trc_flag) {
53 fc_trc_flag->fc_row_file = 0;
54 fc_trc_flag->fc_normal_file = 1;
55 fc_trc_flag->fnic_trace = 2;
56 fc_trc_flag->fc_trace = 3;
57 fc_trc_flag->fc_clear = 4;
58 return 0;
59 }
60
61 return -ENOMEM;
62 }
63
64 /*
65 * fnic_debugfs_terminate - Tear down debugfs infrastructure
66 *
67 * Description:
68 * When Debugfs is configured this routine removes debugfs file system
69 * elements that are specific to fnic.
70 */
fnic_debugfs_terminate(void)71 void fnic_debugfs_terminate(void)
72 {
73 debugfs_remove(fnic_stats_debugfs_root);
74 fnic_stats_debugfs_root = NULL;
75
76 debugfs_remove(fnic_trace_debugfs_root);
77 fnic_trace_debugfs_root = NULL;
78
79 vfree(fc_trc_flag);
80 }
81
82 /*
83 * fnic_trace_ctrl_read -
84 * Read trace_enable ,fc_trace_enable
85 * or fc_trace_clear debugfs file
86 * @filp: The file pointer to read from.
87 * @ubuf: The buffer to copy the data to.
88 * @cnt: The number of bytes to read.
89 * @ppos: The position in the file to start reading from.
90 *
91 * Description:
92 * This routine reads value of variable fnic_tracing_enabled or
93 * fnic_fc_tracing_enabled or fnic_fc_trace_cleared
94 * and stores into local @buf.
95 * It will start reading file at @ppos and
96 * copy up to @cnt of data to @ubuf from @buf.
97 *
98 * Returns:
99 * This function returns the amount of data that was read.
100 */
fnic_trace_ctrl_read(struct file * filp,char __user * ubuf,size_t cnt,loff_t * ppos)101 static ssize_t fnic_trace_ctrl_read(struct file *filp,
102 char __user *ubuf,
103 size_t cnt, loff_t *ppos)
104 {
105 char buf[64];
106 int len;
107 u8 *trace_type;
108 len = 0;
109 trace_type = (u8 *)filp->private_data;
110 if (*trace_type == fc_trc_flag->fnic_trace)
111 len = sprintf(buf, "%d\n", fnic_tracing_enabled);
112 else if (*trace_type == fc_trc_flag->fc_trace)
113 len = sprintf(buf, "%d\n", fnic_fc_tracing_enabled);
114 else if (*trace_type == fc_trc_flag->fc_clear)
115 len = sprintf(buf, "%d\n", fnic_fc_trace_cleared);
116 else
117 pr_err("fnic: Cannot read to any debugfs file\n");
118
119 return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
120 }
121
122 /*
123 * fnic_trace_ctrl_write -
124 * Write to trace_enable, fc_trace_enable or
125 * fc_trace_clear debugfs file
126 * @filp: The file pointer to write from.
127 * @ubuf: The buffer to copy the data from.
128 * @cnt: The number of bytes to write.
129 * @ppos: The position in the file to start writing to.
130 *
131 * Description:
132 * This routine writes data from user buffer @ubuf to buffer @buf and
133 * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared
134 * value as per user input.
135 *
136 * Returns:
137 * This function returns the amount of data that was written.
138 */
fnic_trace_ctrl_write(struct file * filp,const char __user * ubuf,size_t cnt,loff_t * ppos)139 static ssize_t fnic_trace_ctrl_write(struct file *filp,
140 const char __user *ubuf,
141 size_t cnt, loff_t *ppos)
142 {
143 char buf[64];
144 unsigned long val;
145 int ret;
146 u8 *trace_type;
147 trace_type = (u8 *)filp->private_data;
148
149 if (cnt >= sizeof(buf))
150 return -EINVAL;
151
152 if (copy_from_user(&buf, ubuf, cnt))
153 return -EFAULT;
154
155 buf[cnt] = 0;
156
157 ret = kstrtoul(buf, 10, &val);
158 if (ret < 0)
159 return ret;
160
161 if (*trace_type == fc_trc_flag->fnic_trace)
162 fnic_tracing_enabled = val;
163 else if (*trace_type == fc_trc_flag->fc_trace)
164 fnic_fc_tracing_enabled = val;
165 else if (*trace_type == fc_trc_flag->fc_clear)
166 fnic_fc_trace_cleared = val;
167 else
168 pr_err("fnic: cannot write to any debugfs file\n");
169
170 (*ppos)++;
171
172 return cnt;
173 }
174
175 static const struct file_operations fnic_trace_ctrl_fops = {
176 .owner = THIS_MODULE,
177 .open = simple_open,
178 .read = fnic_trace_ctrl_read,
179 .write = fnic_trace_ctrl_write,
180 };
181
182 /*
183 * fnic_trace_debugfs_open - Open the fnic trace log
184 * @inode: The inode pointer
185 * @file: The file pointer to attach the log output
186 *
187 * Description:
188 * This routine is the entry point for the debugfs open file operation.
189 * It allocates the necessary buffer for the log, fills the buffer from
190 * the in-memory log and then returns a pointer to that log in
191 * the private_data field in @file.
192 *
193 * Returns:
194 * This function returns zero if successful. On error it will return
195 * a negative error value.
196 */
fnic_trace_debugfs_open(struct inode * inode,struct file * file)197 static int fnic_trace_debugfs_open(struct inode *inode,
198 struct file *file)
199 {
200 fnic_dbgfs_t *fnic_dbg_prt;
201 u8 *rdata_ptr;
202 rdata_ptr = (u8 *)inode->i_private;
203 fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL);
204 if (!fnic_dbg_prt)
205 return -ENOMEM;
206
207 if (*rdata_ptr == fc_trc_flag->fnic_trace) {
208 fnic_dbg_prt->buffer = vzalloc(array3_size(3, trace_max_pages,
209 PAGE_SIZE));
210 if (!fnic_dbg_prt->buffer) {
211 kfree(fnic_dbg_prt);
212 return -ENOMEM;
213 }
214 fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
215 } else {
216 fnic_dbg_prt->buffer =
217 vzalloc(array3_size(3, fnic_fc_trace_max_pages,
218 PAGE_SIZE));
219 if (!fnic_dbg_prt->buffer) {
220 kfree(fnic_dbg_prt);
221 return -ENOMEM;
222 }
223 fnic_dbg_prt->buffer_len =
224 fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr);
225 }
226 file->private_data = fnic_dbg_prt;
227
228 return 0;
229 }
230
231 /*
232 * fnic_trace_debugfs_lseek - Seek through a debugfs file
233 * @file: The file pointer to seek through.
234 * @offset: The offset to seek to or the amount to seek by.
235 * @howto: Indicates how to seek.
236 *
237 * Description:
238 * This routine is the entry point for the debugfs lseek file operation.
239 * The @howto parameter indicates whether @offset is the offset to directly
240 * seek to, or if it is a value to seek forward or reverse by. This function
241 * figures out what the new offset of the debugfs file will be and assigns
242 * that value to the f_pos field of @file.
243 *
244 * Returns:
245 * This function returns the new offset if successful and returns a negative
246 * error if unable to process the seek.
247 */
fnic_trace_debugfs_lseek(struct file * file,loff_t offset,int howto)248 static loff_t fnic_trace_debugfs_lseek(struct file *file,
249 loff_t offset,
250 int howto)
251 {
252 fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
253 return fixed_size_llseek(file, offset, howto,
254 fnic_dbg_prt->buffer_len);
255 }
256
257 /*
258 * fnic_trace_debugfs_read - Read a debugfs file
259 * @file: The file pointer to read from.
260 * @ubuf: The buffer to copy the data to.
261 * @nbytes: The number of bytes to read.
262 * @pos: The position in the file to start reading from.
263 *
264 * Description:
265 * This routine reads data from the buffer indicated in the private_data
266 * field of @file. It will start reading at @pos and copy up to @nbytes of
267 * data to @ubuf.
268 *
269 * Returns:
270 * This function returns the amount of data that was read (this could be
271 * less than @nbytes if the end of the file was reached).
272 */
fnic_trace_debugfs_read(struct file * file,char __user * ubuf,size_t nbytes,loff_t * pos)273 static ssize_t fnic_trace_debugfs_read(struct file *file,
274 char __user *ubuf,
275 size_t nbytes,
276 loff_t *pos)
277 {
278 fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
279 int rc = 0;
280 rc = simple_read_from_buffer(ubuf, nbytes, pos,
281 fnic_dbg_prt->buffer,
282 fnic_dbg_prt->buffer_len);
283 return rc;
284 }
285
286 /*
287 * fnic_trace_debugfs_release - Release the buffer used to store
288 * debugfs file data
289 * @inode: The inode pointer
290 * @file: The file pointer that contains the buffer to release
291 *
292 * Description:
293 * This routine frees the buffer that was allocated when the debugfs
294 * file was opened.
295 *
296 * Returns:
297 * This function returns zero.
298 */
fnic_trace_debugfs_release(struct inode * inode,struct file * file)299 static int fnic_trace_debugfs_release(struct inode *inode,
300 struct file *file)
301 {
302 fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
303
304 vfree(fnic_dbg_prt->buffer);
305 kfree(fnic_dbg_prt);
306 return 0;
307 }
308
309 static const struct file_operations fnic_trace_debugfs_fops = {
310 .owner = THIS_MODULE,
311 .open = fnic_trace_debugfs_open,
312 .llseek = fnic_trace_debugfs_lseek,
313 .read = fnic_trace_debugfs_read,
314 .release = fnic_trace_debugfs_release,
315 };
316
317 /*
318 * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
319 *
320 * Description:
321 * When Debugfs is configured this routine sets up the fnic debugfs
322 * file system. If not already created, this routine will create the
323 * create file trace to log fnic trace buffer output into debugfs and
324 * it will also create file trace_enable to control enable/disable of
325 * trace logging into trace buffer.
326 */
fnic_trace_debugfs_init(void)327 void fnic_trace_debugfs_init(void)
328 {
329 fnic_trace_enable = debugfs_create_file("tracing_enable",
330 S_IFREG|S_IRUGO|S_IWUSR,
331 fnic_trace_debugfs_root,
332 &(fc_trc_flag->fnic_trace),
333 &fnic_trace_ctrl_fops);
334
335 fnic_trace_debugfs_file = debugfs_create_file("trace",
336 S_IFREG|S_IRUGO|S_IWUSR,
337 fnic_trace_debugfs_root,
338 &(fc_trc_flag->fnic_trace),
339 &fnic_trace_debugfs_fops);
340 }
341
342 /*
343 * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
344 *
345 * Description:
346 * When Debugfs is configured this routine removes debugfs file system
347 * elements that are specific to fnic trace logging.
348 */
fnic_trace_debugfs_terminate(void)349 void fnic_trace_debugfs_terminate(void)
350 {
351 debugfs_remove(fnic_trace_debugfs_file);
352 fnic_trace_debugfs_file = NULL;
353
354 debugfs_remove(fnic_trace_enable);
355 fnic_trace_enable = NULL;
356 }
357
358 /*
359 * fnic_fc_trace_debugfs_init -
360 * Initialize debugfs for fnic control frame trace logging
361 *
362 * Description:
363 * When Debugfs is configured this routine sets up the fnic_fc debugfs
364 * file system. If not already created, this routine will create the
365 * create file trace to log fnic fc trace buffer output into debugfs and
366 * it will also create file fc_trace_enable to control enable/disable of
367 * trace logging into trace buffer.
368 */
369
fnic_fc_trace_debugfs_init(void)370 void fnic_fc_trace_debugfs_init(void)
371 {
372 fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable",
373 S_IFREG|S_IRUGO|S_IWUSR,
374 fnic_trace_debugfs_root,
375 &(fc_trc_flag->fc_trace),
376 &fnic_trace_ctrl_fops);
377
378 fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear",
379 S_IFREG|S_IRUGO|S_IWUSR,
380 fnic_trace_debugfs_root,
381 &(fc_trc_flag->fc_clear),
382 &fnic_trace_ctrl_fops);
383
384 fnic_fc_rdata_trace_debugfs_file =
385 debugfs_create_file("fc_trace_rdata",
386 S_IFREG|S_IRUGO|S_IWUSR,
387 fnic_trace_debugfs_root,
388 &(fc_trc_flag->fc_normal_file),
389 &fnic_trace_debugfs_fops);
390
391 fnic_fc_trace_debugfs_file =
392 debugfs_create_file("fc_trace",
393 S_IFREG|S_IRUGO|S_IWUSR,
394 fnic_trace_debugfs_root,
395 &(fc_trc_flag->fc_row_file),
396 &fnic_trace_debugfs_fops);
397 }
398
399 /*
400 * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure
401 *
402 * Description:
403 * When Debugfs is configured this routine removes debugfs file system
404 * elements that are specific to fnic_fc trace logging.
405 */
406
fnic_fc_trace_debugfs_terminate(void)407 void fnic_fc_trace_debugfs_terminate(void)
408 {
409 debugfs_remove(fnic_fc_trace_debugfs_file);
410 fnic_fc_trace_debugfs_file = NULL;
411
412 debugfs_remove(fnic_fc_rdata_trace_debugfs_file);
413 fnic_fc_rdata_trace_debugfs_file = NULL;
414
415 debugfs_remove(fnic_fc_trace_enable);
416 fnic_fc_trace_enable = NULL;
417
418 debugfs_remove(fnic_fc_trace_clear);
419 fnic_fc_trace_clear = NULL;
420 }
421
422 /*
423 * fnic_reset_stats_open - Open the reset_stats file
424 * @inode: The inode pointer.
425 * @file: The file pointer to attach the stats reset flag.
426 *
427 * Description:
428 * This routine opens a debugsfs file reset_stats and stores i_private data
429 * to debug structure to retrieve later for while performing other
430 * file oprations.
431 *
432 * Returns:
433 * This function returns zero if successful.
434 */
fnic_reset_stats_open(struct inode * inode,struct file * file)435 static int fnic_reset_stats_open(struct inode *inode, struct file *file)
436 {
437 struct stats_debug_info *debug;
438
439 debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
440 if (!debug)
441 return -ENOMEM;
442
443 debug->i_private = inode->i_private;
444
445 file->private_data = debug;
446
447 return 0;
448 }
449
450 /*
451 * fnic_reset_stats_read - Read a reset_stats debugfs file
452 * @filp: The file pointer to read from.
453 * @ubuf: The buffer to copy the data to.
454 * @cnt: The number of bytes to read.
455 * @ppos: The position in the file to start reading from.
456 *
457 * Description:
458 * This routine reads value of variable reset_stats
459 * and stores into local @buf. It will start reading file at @ppos and
460 * copy up to @cnt of data to @ubuf from @buf.
461 *
462 * Returns:
463 * This function returns the amount of data that was read.
464 */
fnic_reset_stats_read(struct file * file,char __user * ubuf,size_t cnt,loff_t * ppos)465 static ssize_t fnic_reset_stats_read(struct file *file,
466 char __user *ubuf,
467 size_t cnt, loff_t *ppos)
468 {
469 struct stats_debug_info *debug = file->private_data;
470 struct fnic *fnic = (struct fnic *)debug->i_private;
471 char buf[64];
472 int len;
473
474 len = sprintf(buf, "%u\n", fnic->reset_stats);
475
476 return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
477 }
478
479 /*
480 * fnic_reset_stats_write - Write to reset_stats debugfs file
481 * @filp: The file pointer to write from.
482 * @ubuf: The buffer to copy the data from.
483 * @cnt: The number of bytes to write.
484 * @ppos: The position in the file to start writing to.
485 *
486 * Description:
487 * This routine writes data from user buffer @ubuf to buffer @buf and
488 * resets cumulative stats of fnic.
489 *
490 * Returns:
491 * This function returns the amount of data that was written.
492 */
fnic_reset_stats_write(struct file * file,const char __user * ubuf,size_t cnt,loff_t * ppos)493 static ssize_t fnic_reset_stats_write(struct file *file,
494 const char __user *ubuf,
495 size_t cnt, loff_t *ppos)
496 {
497 struct stats_debug_info *debug = file->private_data;
498 struct fnic *fnic = (struct fnic *)debug->i_private;
499 struct fnic_stats *stats = &fnic->fnic_stats;
500 u64 *io_stats_p = (u64 *)&stats->io_stats;
501 u64 *fw_stats_p = (u64 *)&stats->fw_stats;
502 char buf[64];
503 unsigned long val;
504 int ret;
505
506 if (cnt >= sizeof(buf))
507 return -EINVAL;
508
509 if (copy_from_user(&buf, ubuf, cnt))
510 return -EFAULT;
511
512 buf[cnt] = 0;
513
514 ret = kstrtoul(buf, 10, &val);
515 if (ret < 0)
516 return ret;
517
518 fnic->reset_stats = val;
519
520 if (fnic->reset_stats) {
521 /* Skip variable is used to avoid descrepancies to Num IOs
522 * and IO Completions stats. Skip incrementing No IO Compls
523 * for pending active IOs after reset stats
524 */
525 atomic64_set(&fnic->io_cmpl_skip,
526 atomic64_read(&stats->io_stats.active_ios));
527 memset(&stats->abts_stats, 0, sizeof(struct abort_stats));
528 memset(&stats->term_stats, 0,
529 sizeof(struct terminate_stats));
530 memset(&stats->reset_stats, 0, sizeof(struct reset_stats));
531 memset(&stats->misc_stats, 0, sizeof(struct misc_stats));
532 memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats));
533 memset(io_stats_p+1, 0,
534 sizeof(struct io_path_stats) - sizeof(u64));
535 memset(fw_stats_p+1, 0,
536 sizeof(struct fw_stats) - sizeof(u64));
537 ktime_get_real_ts64(&stats->stats_timestamps.last_reset_time);
538 }
539
540 (*ppos)++;
541 return cnt;
542 }
543
544 /*
545 * fnic_reset_stats_release - Release the buffer used to store
546 * debugfs file data
547 * @inode: The inode pointer
548 * @file: The file pointer that contains the buffer to release
549 *
550 * Description:
551 * This routine frees the buffer that was allocated when the debugfs
552 * file was opened.
553 *
554 * Returns:
555 * This function returns zero.
556 */
fnic_reset_stats_release(struct inode * inode,struct file * file)557 static int fnic_reset_stats_release(struct inode *inode,
558 struct file *file)
559 {
560 struct stats_debug_info *debug = file->private_data;
561 kfree(debug);
562 return 0;
563 }
564
565 /*
566 * fnic_stats_debugfs_open - Open the stats file for specific host
567 * and get fnic stats.
568 * @inode: The inode pointer.
569 * @file: The file pointer to attach the specific host statistics.
570 *
571 * Description:
572 * This routine opens a debugsfs file stats of specific host and print
573 * fnic stats.
574 *
575 * Returns:
576 * This function returns zero if successful.
577 */
fnic_stats_debugfs_open(struct inode * inode,struct file * file)578 static int fnic_stats_debugfs_open(struct inode *inode,
579 struct file *file)
580 {
581 struct fnic *fnic = inode->i_private;
582 struct fnic_stats *fnic_stats = &fnic->fnic_stats;
583 struct stats_debug_info *debug;
584 int buf_size = 2 * PAGE_SIZE;
585
586 debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
587 if (!debug)
588 return -ENOMEM;
589
590 debug->debug_buffer = vmalloc(buf_size);
591 if (!debug->debug_buffer) {
592 kfree(debug);
593 return -ENOMEM;
594 }
595
596 debug->buf_size = buf_size;
597 memset((void *)debug->debug_buffer, 0, buf_size);
598 debug->buffer_len = fnic_get_stats_data(debug, fnic_stats);
599 debug->buffer_len += fnic_get_debug_info(debug, fnic);
600
601 file->private_data = debug;
602
603 return 0;
604 }
605
606 /*
607 * fnic_stats_debugfs_read - Read a debugfs file
608 * @file: The file pointer to read from.
609 * @ubuf: The buffer to copy the data to.
610 * @nbytes: The number of bytes to read.
611 * @pos: The position in the file to start reading from.
612 *
613 * Description:
614 * This routine reads data from the buffer indicated in the private_data
615 * field of @file. It will start reading at @pos and copy up to @nbytes of
616 * data to @ubuf.
617 *
618 * Returns:
619 * This function returns the amount of data that was read (this could be
620 * less than @nbytes if the end of the file was reached).
621 */
fnic_stats_debugfs_read(struct file * file,char __user * ubuf,size_t nbytes,loff_t * pos)622 static ssize_t fnic_stats_debugfs_read(struct file *file,
623 char __user *ubuf,
624 size_t nbytes,
625 loff_t *pos)
626 {
627 struct stats_debug_info *debug = file->private_data;
628 int rc = 0;
629 rc = simple_read_from_buffer(ubuf, nbytes, pos,
630 debug->debug_buffer,
631 debug->buffer_len);
632 return rc;
633 }
634
635 /*
636 * fnic_stats_stats_release - Release the buffer used to store
637 * debugfs file data
638 * @inode: The inode pointer
639 * @file: The file pointer that contains the buffer to release
640 *
641 * Description:
642 * This routine frees the buffer that was allocated when the debugfs
643 * file was opened.
644 *
645 * Returns:
646 * This function returns zero.
647 */
fnic_stats_debugfs_release(struct inode * inode,struct file * file)648 static int fnic_stats_debugfs_release(struct inode *inode,
649 struct file *file)
650 {
651 struct stats_debug_info *debug = file->private_data;
652 vfree(debug->debug_buffer);
653 kfree(debug);
654 return 0;
655 }
656
657 static const struct file_operations fnic_stats_debugfs_fops = {
658 .owner = THIS_MODULE,
659 .open = fnic_stats_debugfs_open,
660 .read = fnic_stats_debugfs_read,
661 .release = fnic_stats_debugfs_release,
662 };
663
664 static const struct file_operations fnic_reset_debugfs_fops = {
665 .owner = THIS_MODULE,
666 .open = fnic_reset_stats_open,
667 .read = fnic_reset_stats_read,
668 .write = fnic_reset_stats_write,
669 .release = fnic_reset_stats_release,
670 };
671
672 /*
673 * fnic_stats_init - Initialize stats struct and create stats file per fnic
674 *
675 * Description:
676 * When Debugfs is configured this routine sets up the stats file per fnic
677 * It will create file stats and reset_stats under statistics/host# directory
678 * to log per fnic stats.
679 */
fnic_stats_debugfs_init(struct fnic * fnic)680 int fnic_stats_debugfs_init(struct fnic *fnic)
681 {
682 char name[16];
683
684 snprintf(name, sizeof(name), "host%d", fnic->host->host_no);
685
686 fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
687 fnic_stats_debugfs_root);
688 fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
689 S_IFREG|S_IRUGO|S_IWUSR,
690 fnic->fnic_stats_debugfs_host,
691 fnic,
692 &fnic_stats_debugfs_fops);
693 fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
694 S_IFREG|S_IRUGO|S_IWUSR,
695 fnic->fnic_stats_debugfs_host,
696 fnic,
697 &fnic_reset_debugfs_fops);
698 return 0;
699 }
700
701 /*
702 * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
703 *
704 * Description:
705 * When Debugfs is configured this routine removes debugfs file system
706 * elements that are specific to fnic stats.
707 */
fnic_stats_debugfs_remove(struct fnic * fnic)708 void fnic_stats_debugfs_remove(struct fnic *fnic)
709 {
710 if (!fnic)
711 return;
712
713 debugfs_remove(fnic->fnic_stats_debugfs_file);
714 fnic->fnic_stats_debugfs_file = NULL;
715
716 debugfs_remove(fnic->fnic_reset_debugfs_file);
717 fnic->fnic_reset_debugfs_file = NULL;
718
719 debugfs_remove(fnic->fnic_stats_debugfs_host);
720 fnic->fnic_stats_debugfs_host = NULL;
721 }
722