projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2341c2f8 MP |
2 | #ifndef _LINUX_T10_PI_H |
| 3 | #define _LINUX_T10_PI_H | |
| 4 | ||
| 5 | #include <linux/types.h> | |
| 24b83deb | 6 | #include <linux/blk-mq.h> |
| 2341c2f8 | 7 | |
| 8475c811 CH |
8 | /* |
| 9 | * A T10 PI-capable target device can be formatted with different | |
| 10 | * protection schemes. Currently 0 through 3 are defined: | |
| 11 | * | |
| 12 | * Type 0 is regular (unprotected) I/O | |
| 13 | * | |
| 14 | * Type 1 defines the contents of the guard and reference tags | |
| 15 | * | |
| 16 | * Type 2 defines the contents of the guard and reference tags and | |
| 17 | * uses 32-byte commands to seed the latter | |
| 18 | * | |
| 19 | * Type 3 defines the contents of the guard tag only | |
| 20 | */ | |
| 21 | enum t10_dif_type { | |
| 22 | T10_PI_TYPE0_PROTECTION = 0x0, | |
| 23 | T10_PI_TYPE1_PROTECTION = 0x1, | |
| 24 | T10_PI_TYPE2_PROTECTION = 0x2, | |
| 25 | T10_PI_TYPE3_PROTECTION = 0x3, | |
| 26 | }; | |
| 27 | ||
| 2341c2f8 MP |
28 | /* |
| 29 | * T10 Protection Information tuple. | |
| 30 | */ | |
| 31 | struct t10_pi_tuple { | |
| 32 | __be16 guard_tag; /* Checksum */ | |
| 33 | __be16 app_tag; /* Opaque storage */ | |
| 34 | __be32 ref_tag; /* Target LBA or indirect LBA */ | |
| 35 | }; | |
| 36 | ||
| 128b6f9f DM |
37 | #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) |
| 38 | #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff) | |
| 2341c2f8 | 39 | |
| ddd0bc75 MG |
40 | static inline u32 t10_pi_ref_tag(struct request *rq) |
| 41 | { | |
| 60a89a3c MP |
42 | unsigned int shift = ilog2(queue_logical_block_size(rq->q)); |
| 43 | ||
| ddd0bc75 | 44 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 60a89a3c MP |
45 | if (rq->q->integrity.interval_exp) |
| 46 | shift = rq->q->integrity.interval_exp; | |
| ddd0bc75 | 47 | #endif |
| 60a89a3c | 48 | return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff; |
| ddd0bc75 MG |
49 | } |
| 50 | ||
| 869ab90f EB |
51 | extern const struct blk_integrity_profile t10_pi_type1_crc; |
| 52 | extern const struct blk_integrity_profile t10_pi_type1_ip; | |
| 53 | extern const struct blk_integrity_profile t10_pi_type3_crc; | |
| 54 | extern const struct blk_integrity_profile t10_pi_type3_ip; | |
| 08fcf813 | 55 | |
| a7d4383f KB |
56 | struct crc64_pi_tuple { |
| 57 | __be64 guard_tag; | |
| 58 | __be16 app_tag; | |
| 59 | __u8 ref_tag[6]; | |
| 60 | }; | |
| 61 | ||
| 868e6139 KB |
62 | /** |
| 63 | * lower_48_bits() - return bits 0-47 of a number | |
| 64 | * @n: the number we're accessing | |
| 65 | */ | |
| 66 | static inline u64 lower_48_bits(u64 n) | |
| 67 | { | |
| 68 | return n & ((1ull << 48) - 1); | |
| 69 | } | |
| 70 | ||
| a7d4383f KB |
71 | static inline u64 ext_pi_ref_tag(struct request *rq) |
| 72 | { | |
| 73 | unsigned int shift = ilog2(queue_logical_block_size(rq->q)); | |
| 74 | ||
| 75 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
| 76 | if (rq->q->integrity.interval_exp) | |
| 77 | shift = rq->q->integrity.interval_exp; | |
| 78 | #endif | |
| 79 | return lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT)); | |
| 80 | } | |
| 81 | ||
| 82 | extern const struct blk_integrity_profile ext_pi_type1_crc64; | |
| 83 | extern const struct blk_integrity_profile ext_pi_type3_crc64; | |
| 84 | ||
| 2341c2f8 | 85 | #endif |