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1#ifndef _LINUX_T10_PI_H
2#define _LINUX_T10_PI_H
3
4#include <linux/types.h>
5#include <linux/blkdev.h>
6
7/*
8 * A T10 PI-capable target device can be formatted with different
9 * protection schemes. Currently 0 through 3 are defined:
10 *
11 * Type 0 is regular (unprotected) I/O
12 *
13 * Type 1 defines the contents of the guard and reference tags
14 *
15 * Type 2 defines the contents of the guard and reference tags and
16 * uses 32-byte commands to seed the latter
17 *
18 * Type 3 defines the contents of the guard tag only
19 */
20enum t10_dif_type {
21 T10_PI_TYPE0_PROTECTION = 0x0,
22 T10_PI_TYPE1_PROTECTION = 0x1,
23 T10_PI_TYPE2_PROTECTION = 0x2,
24 T10_PI_TYPE3_PROTECTION = 0x3,
25};
26
27/*
28 * T10 Protection Information tuple.
29 */
30struct t10_pi_tuple {
31 __be16 guard_tag; /* Checksum */
32 __be16 app_tag; /* Opaque storage */
33 __be32 ref_tag; /* Target LBA or indirect LBA */
34};
35
36#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
37#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)
38
39extern const struct blk_integrity_profile t10_pi_type1_crc;
40extern const struct blk_integrity_profile t10_pi_type1_ip;
41extern const struct blk_integrity_profile t10_pi_type3_crc;
42extern const struct blk_integrity_profile t10_pi_type3_ip;
43
44#endif