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2341c2f8 MP |
1 | #ifndef _LINUX_T10_PI_H |
2 | #define _LINUX_T10_PI_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/blkdev.h> | |
6 | ||
8475c811 CH |
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 | */ | |
20 | enum 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 | ||
2341c2f8 MP |
27 | /* |
28 | * T10 Protection Information tuple. | |
29 | */ | |
30 | struct 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 | ||
128b6f9f DM |
36 | #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) |
37 | #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff) | |
2341c2f8 | 38 | |
869ab90f EB |
39 | extern const struct blk_integrity_profile t10_pi_type1_crc; |
40 | extern const struct blk_integrity_profile t10_pi_type1_ip; | |
41 | extern const struct blk_integrity_profile t10_pi_type3_crc; | |
42 | extern const struct blk_integrity_profile t10_pi_type3_ip; | |
2341c2f8 MP |
43 | |
44 | #endif |