summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/fnic/fnic_debugfs.c
blob: 139fffa3658a4ab8fe666e4d04acf2b2f30393f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
/*
 * Copyright 2012 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include "fnic.h"

static struct dentry *fnic_trace_debugfs_root;
static struct dentry *fnic_trace_debugfs_file;
static struct dentry *fnic_trace_enable;
static struct dentry *fnic_stats_debugfs_root;

static struct dentry *fnic_fc_trace_debugfs_file;
static struct dentry *fnic_fc_rdata_trace_debugfs_file;
static struct dentry *fnic_fc_trace_enable;
static struct dentry *fnic_fc_trace_clear;

struct fc_trace_flag_type {
	u8 fc_row_file;
	u8 fc_normal_file;
	u8 fnic_trace;
	u8 fc_trace;
	u8 fc_clear;
};

static struct fc_trace_flag_type *fc_trc_flag;

/*
 * fnic_debugfs_init - Initialize debugfs for fnic debug logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic debugfs
 * file system. If not already created, this routine will create the
 * fnic directory and statistics directory for trace buffer and
 * stats logging.
 */
int fnic_debugfs_init(void)
{
	int rc = -1;
	fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
	if (!fnic_trace_debugfs_root) {
		printk(KERN_DEBUG "Cannot create debugfs root\n");
		return rc;
	}

	if (!fnic_trace_debugfs_root) {
		printk(KERN_DEBUG
			"fnic root directory doesn't exist in debugfs\n");
		return rc;
	}

	fnic_stats_debugfs_root = debugfs_create_dir("statistics",
						fnic_trace_debugfs_root);
	if (!fnic_stats_debugfs_root) {
		printk(KERN_DEBUG "Cannot create Statistics directory\n");
		return rc;
	}

	/* Allocate memory to structure */
	fc_trc_flag = (struct fc_trace_flag_type *)
		vmalloc(sizeof(struct fc_trace_flag_type));

	if (fc_trc_flag) {
		fc_trc_flag->fc_row_file = 0;
		fc_trc_flag->fc_normal_file = 1;
		fc_trc_flag->fnic_trace = 2;
		fc_trc_flag->fc_trace = 3;
		fc_trc_flag->fc_clear = 4;
	}

	rc = 0;
	return rc;
}

/*
 * fnic_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic.
 */
void fnic_debugfs_terminate(void)
{
	debugfs_remove(fnic_stats_debugfs_root);
	fnic_stats_debugfs_root = NULL;

	debugfs_remove(fnic_trace_debugfs_root);
	fnic_trace_debugfs_root = NULL;

	if (fc_trc_flag)
		vfree(fc_trc_flag);
}

/*
 * fnic_trace_ctrl_read -
 *          Read  trace_enable ,fc_trace_enable
 *              or fc_trace_clear debugfs file
 * @filp: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @cnt: The number of bytes to read.
 * @ppos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads value of variable fnic_tracing_enabled or
 * fnic_fc_tracing_enabled or fnic_fc_trace_cleared
 * and stores into local @buf.
 * It will start reading file at @ppos and
 * copy up to @cnt of data to @ubuf from @buf.
 *
 * Returns:
 * This function returns the amount of data that was read.
 */
static ssize_t fnic_trace_ctrl_read(struct file *filp,
				  char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{
	char buf[64];
	int len;
	u8 *trace_type;
	len = 0;
	trace_type = (u8 *)filp->private_data;
	if (*trace_type == fc_trc_flag->fnic_trace)
		len = sprintf(buf, "%u\n", fnic_tracing_enabled);
	else if (*trace_type == fc_trc_flag->fc_trace)
		len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled);
	else if (*trace_type == fc_trc_flag->fc_clear)
		len = sprintf(buf, "%u\n", fnic_fc_trace_cleared);
	else
		pr_err("fnic: Cannot read to any debugfs file\n");

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
}

/*
 * fnic_trace_ctrl_write -
 * Write to trace_enable, fc_trace_enable or
 *         fc_trace_clear debugfs file
 * @filp: The file pointer to write from.
 * @ubuf: The buffer to copy the data from.
 * @cnt: The number of bytes to write.
 * @ppos: The position in the file to start writing to.
 *
 * Description:
 * This routine writes data from user buffer @ubuf to buffer @buf and
 * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared
 * value as per user input.
 *
 * Returns:
 * This function returns the amount of data that was written.
 */
static ssize_t fnic_trace_ctrl_write(struct file *filp,
				  const char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{
	char buf[64];
	unsigned long val;
	int ret;
	u8 *trace_type;
	trace_type = (u8 *)filp->private_data;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(&buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	ret = kstrtoul(buf, 10, &val);
	if (ret < 0)
		return ret;

	if (*trace_type == fc_trc_flag->fnic_trace)
		fnic_tracing_enabled = val;
	else if (*trace_type == fc_trc_flag->fc_trace)
		fnic_fc_tracing_enabled = val;
	else if (*trace_type == fc_trc_flag->fc_clear)
		fnic_fc_trace_cleared = val;
	else
		pr_err("fnic: cannot write to any debugfs file\n");

	(*ppos)++;

	return cnt;
}

static const struct file_operations fnic_trace_ctrl_fops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read = fnic_trace_ctrl_read,
	.write = fnic_trace_ctrl_write,
};

/*
 * fnic_trace_debugfs_open - Open the fnic trace log
 * @inode: The inode pointer
 * @file: The file pointer to attach the log output
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation.
 * It allocates the necessary buffer for the log, fills the buffer from
 * the in-memory log and then returns a pointer to that log in
 * the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return
 * a negative error value.
 */
static int fnic_trace_debugfs_open(struct inode *inode,
				  struct file *file)
{
	fnic_dbgfs_t *fnic_dbg_prt;
	u8 *rdata_ptr;
	rdata_ptr = (u8 *)inode->i_private;
	fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL);
	if (!fnic_dbg_prt)
		return -ENOMEM;

	if (*rdata_ptr == fc_trc_flag->fnic_trace) {
		fnic_dbg_prt->buffer = vmalloc(array3_size(3, trace_max_pages,
							   PAGE_SIZE));
		if (!fnic_dbg_prt->buffer) {
			kfree(fnic_dbg_prt);
			return -ENOMEM;
		}
		memset((void *)fnic_dbg_prt->buffer, 0,
		3 * (trace_max_pages * PAGE_SIZE));
		fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
	} else {
		fnic_dbg_prt->buffer =
			vmalloc(array3_size(3, fnic_fc_trace_max_pages,
					    PAGE_SIZE));
		if (!fnic_dbg_prt->buffer) {
			kfree(fnic_dbg_prt);
			return -ENOMEM;
		}
		memset((void *)fnic_dbg_prt->buffer, 0,
			3 * (fnic_fc_trace_max_pages * PAGE_SIZE));
		fnic_dbg_prt->buffer_len =
			fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr);
	}
	file->private_data = fnic_dbg_prt;

	return 0;
}

/*
 * fnic_trace_debugfs_lseek - Seek through a debugfs file
 * @file: The file pointer to seek through.
 * @offset: The offset to seek to or the amount to seek by.
 * @howto: Indicates how to seek.
 *
 * Description:
 * This routine is the entry point for the debugfs lseek file operation.
 * The @howto parameter indicates whether @offset is the offset to directly
 * seek to, or if it is a value to seek forward or reverse by. This function
 * figures out what the new offset of the debugfs file will be and assigns
 * that value to the f_pos field of @file.
 *
 * Returns:
 * This function returns the new offset if successful and returns a negative
 * error if unable to process the seek.
 */
static loff_t fnic_trace_debugfs_lseek(struct file *file,
					loff_t offset,
					int howto)
{
	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
	return fixed_size_llseek(file, offset, howto,
				fnic_dbg_prt->buffer_len);
}

/*
 * fnic_trace_debugfs_read - Read a debugfs file
 * @file: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @nbytes: The number of bytes to read.
 * @pos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads data from the buffer indicated in the private_data
 * field of @file. It will start reading at @pos and copy up to @nbytes of
 * data to @ubuf.
 *
 * Returns:
 * This function returns the amount of data that was read (this could be
 * less than @nbytes if the end of the file was reached).
 */
static ssize_t fnic_trace_debugfs_read(struct file *file,
					char __user *ubuf,
					size_t nbytes,
					loff_t *pos)
{
	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
	int rc = 0;
	rc = simple_read_from_buffer(ubuf, nbytes, pos,
				  fnic_dbg_prt->buffer,
				  fnic_dbg_prt->buffer_len);
	return rc;
}

/*
 * fnic_trace_debugfs_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_trace_debugfs_release(struct inode *inode,
					  struct file *file)
{
	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;

	vfree(fnic_dbg_prt->buffer);
	kfree(fnic_dbg_prt);
	return 0;
}

static const struct file_operations fnic_trace_debugfs_fops = {
	.owner = THIS_MODULE,
	.open = fnic_trace_debugfs_open,
	.llseek = fnic_trace_debugfs_lseek,
	.read = fnic_trace_debugfs_read,
	.release = fnic_trace_debugfs_release,
};

/*
 * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic debugfs
 * file system. If not already created, this routine will create the
 * create file trace to log fnic trace buffer output into debugfs and
 * it will also create file trace_enable to control enable/disable of
 * trace logging into trace buffer.
 */
int fnic_trace_debugfs_init(void)
{
	int rc = -1;
	if (!fnic_trace_debugfs_root) {
		printk(KERN_DEBUG
			"FNIC Debugfs root directory doesn't exist\n");
		return rc;
	}
	fnic_trace_enable = debugfs_create_file("tracing_enable",
					S_IFREG|S_IRUGO|S_IWUSR,
					fnic_trace_debugfs_root,
					&(fc_trc_flag->fnic_trace),
					&fnic_trace_ctrl_fops);

	if (!fnic_trace_enable) {
		printk(KERN_DEBUG
			"Cannot create trace_enable file under debugfs\n");
		return rc;
	}

	fnic_trace_debugfs_file = debugfs_create_file("trace",
					S_IFREG|S_IRUGO|S_IWUSR,
					fnic_trace_debugfs_root,
					&(fc_trc_flag->fnic_trace),
					&fnic_trace_debugfs_fops);

	if (!fnic_trace_debugfs_file) {
		printk(KERN_DEBUG
			"Cannot create trace file under debugfs\n");
		return rc;
	}
	rc = 0;
	return rc;
}

/*
 * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic trace logging.
 */
void fnic_trace_debugfs_terminate(void)
{
	debugfs_remove(fnic_trace_debugfs_file);
	fnic_trace_debugfs_file = NULL;

	debugfs_remove(fnic_trace_enable);
	fnic_trace_enable = NULL;
}

/*
 * fnic_fc_trace_debugfs_init -
 * Initialize debugfs for fnic control frame trace logging
 *
 * Description:
 * When Debugfs is configured this routine sets up the fnic_fc debugfs
 * file system. If not already created, this routine will create the
 * create file trace to log fnic fc trace buffer output into debugfs and
 * it will also create file fc_trace_enable to control enable/disable of
 * trace logging into trace buffer.
 */

int fnic_fc_trace_debugfs_init(void)
{
	int rc = -1;

	if (!fnic_trace_debugfs_root) {
		pr_err("fnic:Debugfs root directory doesn't exist\n");
		return rc;
	}

	fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable",
					S_IFREG|S_IRUGO|S_IWUSR,
					fnic_trace_debugfs_root,
					&(fc_trc_flag->fc_trace),
					&fnic_trace_ctrl_fops);

	if (!fnic_fc_trace_enable) {
		pr_err("fnic: Failed create fc_trace_enable file\n");
		return rc;
	}

	fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear",
					S_IFREG|S_IRUGO|S_IWUSR,
					fnic_trace_debugfs_root,
					&(fc_trc_flag->fc_clear),
					&fnic_trace_ctrl_fops);

	if (!fnic_fc_trace_clear) {
		pr_err("fnic: Failed to create fc_trace_enable file\n");
		return rc;
	}

	fnic_fc_rdata_trace_debugfs_file =
		debugfs_create_file("fc_trace_rdata",
				    S_IFREG|S_IRUGO|S_IWUSR,
				    fnic_trace_debugfs_root,
				    &(fc_trc_flag->fc_normal_file),
				    &fnic_trace_debugfs_fops);

	if (!fnic_fc_rdata_trace_debugfs_file) {
		pr_err("fnic: Failed create fc_rdata_trace file\n");
		return rc;
	}

	fnic_fc_trace_debugfs_file =
		debugfs_create_file("fc_trace",
				    S_IFREG|S_IRUGO|S_IWUSR,
				    fnic_trace_debugfs_root,
				    &(fc_trc_flag->fc_row_file),
				    &fnic_trace_debugfs_fops);

	if (!fnic_fc_trace_debugfs_file) {
		pr_err("fnic: Failed to create fc_trace file\n");
		return rc;
	}
	rc = 0;
	return rc;
}

/*
 * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic_fc trace logging.
 */

void fnic_fc_trace_debugfs_terminate(void)
{
	debugfs_remove(fnic_fc_trace_debugfs_file);
	fnic_fc_trace_debugfs_file = NULL;

	debugfs_remove(fnic_fc_rdata_trace_debugfs_file);
	fnic_fc_rdata_trace_debugfs_file = NULL;

	debugfs_remove(fnic_fc_trace_enable);
	fnic_fc_trace_enable = NULL;

	debugfs_remove(fnic_fc_trace_clear);
	fnic_fc_trace_clear = NULL;
}

/*
 * fnic_reset_stats_open - Open the reset_stats file
 * @inode: The inode pointer.
 * @file: The file pointer to attach the stats reset flag.
 *
 * Description:
 * This routine opens a debugsfs file reset_stats and stores i_private data
 * to debug structure to retrieve later for while performing other
 * file oprations.
 *
 * Returns:
 * This function returns zero if successful.
 */
static int fnic_reset_stats_open(struct inode *inode, struct file *file)
{
	struct stats_debug_info *debug;

	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
	if (!debug)
		return -ENOMEM;

	debug->i_private = inode->i_private;

	file->private_data = debug;

	return 0;
}

/*
 * fnic_reset_stats_read - Read a reset_stats debugfs file
 * @filp: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @cnt: The number of bytes to read.
 * @ppos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads value of variable reset_stats
 * and stores into local @buf. It will start reading file at @ppos and
 * copy up to @cnt of data to @ubuf from @buf.
 *
 * Returns:
 * This function returns the amount of data that was read.
 */
static ssize_t fnic_reset_stats_read(struct file *file,
					char __user *ubuf,
					size_t cnt, loff_t *ppos)
{
	struct stats_debug_info *debug = file->private_data;
	struct fnic *fnic = (struct fnic *)debug->i_private;
	char buf[64];
	int len;

	len = sprintf(buf, "%u\n", fnic->reset_stats);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
}

/*
 * fnic_reset_stats_write - Write to reset_stats debugfs file
 * @filp: The file pointer to write from.
 * @ubuf: The buffer to copy the data from.
 * @cnt: The number of bytes to write.
 * @ppos: The position in the file to start writing to.
 *
 * Description:
 * This routine writes data from user buffer @ubuf to buffer @buf and
 * resets cumulative stats of fnic.
 *
 * Returns:
 * This function returns the amount of data that was written.
 */
static ssize_t fnic_reset_stats_write(struct file *file,
					const char __user *ubuf,
					size_t cnt, loff_t *ppos)
{
	struct stats_debug_info *debug = file->private_data;
	struct fnic *fnic = (struct fnic *)debug->i_private;
	struct fnic_stats *stats = &fnic->fnic_stats;
	u64 *io_stats_p = (u64 *)&stats->io_stats;
	u64 *fw_stats_p = (u64 *)&stats->fw_stats;
	char buf[64];
	unsigned long val;
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(&buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	ret = kstrtoul(buf, 10, &val);
	if (ret < 0)
		return ret;

	fnic->reset_stats = val;

	if (fnic->reset_stats) {
		/* Skip variable is used to avoid descrepancies to Num IOs
		 * and IO Completions stats. Skip incrementing No IO Compls
		 * for pending active IOs after reset stats
		 */
		atomic64_set(&fnic->io_cmpl_skip,
			atomic64_read(&stats->io_stats.active_ios));
		memset(&stats->abts_stats, 0, sizeof(struct abort_stats));
		memset(&stats->term_stats, 0,
			sizeof(struct terminate_stats));
		memset(&stats->reset_stats, 0, sizeof(struct reset_stats));
		memset(&stats->misc_stats, 0, sizeof(struct misc_stats));
		memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats));
		memset(io_stats_p+1, 0,
			sizeof(struct io_path_stats) - sizeof(u64));
		memset(fw_stats_p+1, 0,
			sizeof(struct fw_stats) - sizeof(u64));
		ktime_get_real_ts64(&stats->stats_timestamps.last_reset_time);
	}

	(*ppos)++;
	return cnt;
}

/*
 * fnic_reset_stats_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_reset_stats_release(struct inode *inode,
					struct file *file)
{
	struct stats_debug_info *debug = file->private_data;
	kfree(debug);
	return 0;
}

/*
 * fnic_stats_debugfs_open - Open the stats file for specific host
 * and get fnic stats.
 * @inode: The inode pointer.
 * @file: The file pointer to attach the specific host statistics.
 *
 * Description:
 * This routine opens a debugsfs file stats of specific host and print
 * fnic stats.
 *
 * Returns:
 * This function returns zero if successful.
 */
static int fnic_stats_debugfs_open(struct inode *inode,
					struct file *file)
{
	struct fnic *fnic = inode->i_private;
	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
	struct stats_debug_info *debug;
	int buf_size = 2 * PAGE_SIZE;

	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
	if (!debug)
		return -ENOMEM;

	debug->debug_buffer = vmalloc(buf_size);
	if (!debug->debug_buffer) {
		kfree(debug);
		return -ENOMEM;
	}

	debug->buf_size = buf_size;
	memset((void *)debug->debug_buffer, 0, buf_size);
	debug->buffer_len = fnic_get_stats_data(debug, fnic_stats);

	file->private_data = debug;

	return 0;
}

/*
 * fnic_stats_debugfs_read - Read a debugfs file
 * @file: The file pointer to read from.
 * @ubuf: The buffer to copy the data to.
 * @nbytes: The number of bytes to read.
 * @pos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads data from the buffer indicated in the private_data
 * field of @file. It will start reading at @pos and copy up to @nbytes of
 * data to @ubuf.
 *
 * Returns:
 * This function returns the amount of data that was read (this could be
 * less than @nbytes if the end of the file was reached).
 */
static ssize_t fnic_stats_debugfs_read(struct file *file,
					char __user *ubuf,
					size_t nbytes,
					loff_t *pos)
{
	struct stats_debug_info *debug = file->private_data;
	int rc = 0;
	rc = simple_read_from_buffer(ubuf, nbytes, pos,
					debug->debug_buffer,
					debug->buffer_len);
	return rc;
}

/*
 * fnic_stats_stats_release - Release the buffer used to store
 * debugfs file data
 * @inode: The inode pointer
 * @file: The file pointer that contains the buffer to release
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs
 * file was opened.
 *
 * Returns:
 * This function returns zero.
 */
static int fnic_stats_debugfs_release(struct inode *inode,
					struct file *file)
{
	struct stats_debug_info *debug = file->private_data;
	vfree(debug->debug_buffer);
	kfree(debug);
	return 0;
}

static const struct file_operations fnic_stats_debugfs_fops = {
	.owner = THIS_MODULE,
	.open = fnic_stats_debugfs_open,
	.read = fnic_stats_debugfs_read,
	.release = fnic_stats_debugfs_release,
};

static const struct file_operations fnic_reset_debugfs_fops = {
	.owner = THIS_MODULE,
	.open = fnic_reset_stats_open,
	.read = fnic_reset_stats_read,
	.write = fnic_reset_stats_write,
	.release = fnic_reset_stats_release,
};

/*
 * fnic_stats_init - Initialize stats struct and create stats file per fnic
 *
 * Description:
 * When Debugfs is configured this routine sets up the stats file per fnic
 * It will create file stats and reset_stats under statistics/host# directory
 * to log per fnic stats.
 */
int fnic_stats_debugfs_init(struct fnic *fnic)
{
	int rc = -1;
	char name[16];

	snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no);

	if (!fnic_stats_debugfs_root) {
		printk(KERN_DEBUG "fnic_stats root doesn't exist\n");
		return rc;
	}
	fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
						fnic_stats_debugfs_root);
	if (!fnic->fnic_stats_debugfs_host) {
		printk(KERN_DEBUG "Cannot create host directory\n");
		return rc;
	}

	fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
						S_IFREG|S_IRUGO|S_IWUSR,
						fnic->fnic_stats_debugfs_host,
						fnic,
						&fnic_stats_debugfs_fops);
	if (!fnic->fnic_stats_debugfs_file) {
		printk(KERN_DEBUG "Cannot create host stats file\n");
		return rc;
	}

	fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
						S_IFREG|S_IRUGO|S_IWUSR,
						fnic->fnic_stats_debugfs_host,
						fnic,
						&fnic_reset_debugfs_fops);
	if (!fnic->fnic_reset_debugfs_file) {
		printk(KERN_DEBUG "Cannot create host stats file\n");
		return rc;
	}
	rc = 0;
	return rc;
}

/*
 * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to fnic stats.
 */
void fnic_stats_debugfs_remove(struct fnic *fnic)
{
	if (!fnic)
		return;

	debugfs_remove(fnic->fnic_stats_debugfs_file);
	fnic->fnic_stats_debugfs_file = NULL;

	debugfs_remove(fnic->fnic_reset_debugfs_file);
	fnic->fnic_reset_debugfs_file = NULL;

	debugfs_remove(fnic->fnic_stats_debugfs_host);
	fnic->fnic_stats_debugfs_host = NULL;
}