blob: 2c59fe3efcd424c10f0eb5fd3f5640c0e29487da (
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
|
/* 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));
if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
rq->q->limits.integrity.interval_exp)
shift = rq->q->limits.integrity.interval_exp;
return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff;
}
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));
if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
rq->q->limits.integrity.interval_exp)
shift = rq->q->limits.integrity.interval_exp;
return lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT));
}
#endif
|
