summaryrefslogtreecommitdiffstats
path: root/include/linux/t10-pi.h
blob: 248f4ac9564258524cd2ea897252023718c415fe (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_T10_PI_H
#define _LINUX_T10_PI_H

#include <linux/types.h>
#include <linux/blk-mq.h>

/*
 * A T10 PI-capable target device can be formatted with different
 * protection schemes.	Currently 0 through 3 are defined:
 *
 * Type 0 is regular (unprotected) I/O
 *
 * Type 1 defines the contents of the guard and reference tags
 *
 * Type 2 defines the contents of the guard and reference tags and
 * uses 32-byte commands to seed the latter
 *
 * Type 3 defines the contents of the guard tag only
 */
enum t10_dif_type {
	T10_PI_TYPE0_PROTECTION = 0x0,
	T10_PI_TYPE1_PROTECTION = 0x1,
	T10_PI_TYPE2_PROTECTION = 0x2,
	T10_PI_TYPE3_PROTECTION = 0x3,
};

/*
 * T10 Protection Information tuple.
 */
struct t10_pi_tuple {
	__be16 guard_tag;	/* Checksum */
	__be16 app_tag;		/* Opaque storage */
	__be32 ref_tag;		/* Target LBA or indirect LBA */
};

#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)

static inline u32 t10_pi_ref_tag(struct request *rq)
{
	unsigned int shift = ilog2(queue_logical_block_size(rq->q));

#ifdef CONFIG_BLK_DEV_INTEGRITY
	if (rq->q->integrity.interval_exp)
		shift = rq->q->integrity.interval_exp;
#endif
	return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff;
}

extern const struct blk_integrity_profile t10_pi_type1_crc;
extern const struct blk_integrity_profile t10_pi_type1_ip;
extern const struct blk_integrity_profile t10_pi_type3_crc;
extern const struct blk_integrity_profile t10_pi_type3_ip;

struct crc64_pi_tuple {
	__be64 guard_tag;
	__be16 app_tag;
	__u8   ref_tag[6];
};

/**
 * lower_48_bits() - return bits 0-47 of a number
 * @n: the number we're accessing
 */
static inline u64 lower_48_bits(u64 n)
{
	return n & ((1ull << 48) - 1);
}

static inline u64 ext_pi_ref_tag(struct request *rq)
{
	unsigned int shift = ilog2(queue_logical_block_size(rq->q));

#ifdef CONFIG_BLK_DEV_INTEGRITY
	if (rq->q->integrity.interval_exp)
		shift = rq->q->integrity.interval_exp;
#endif
	return lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT));
}

extern const struct blk_integrity_profile ext_pi_type1_crc64;
extern const struct blk_integrity_profile ext_pi_type3_crc64;

#endif