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56 lines
1.5 KiB
56 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_T10_PI_H |
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#define _LINUX_T10_PI_H |
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#include <linux/types.h> |
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#include <linux/blkdev.h> |
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/* |
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* A T10 PI-capable target device can be formatted with different |
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* protection schemes. Currently 0 through 3 are defined: |
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* |
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* Type 0 is regular (unprotected) I/O |
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* |
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* Type 1 defines the contents of the guard and reference tags |
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* |
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* Type 2 defines the contents of the guard and reference tags and |
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* uses 32-byte commands to seed the latter |
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* |
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* Type 3 defines the contents of the guard tag only |
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*/ |
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enum t10_dif_type { |
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T10_PI_TYPE0_PROTECTION = 0x0, |
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T10_PI_TYPE1_PROTECTION = 0x1, |
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T10_PI_TYPE2_PROTECTION = 0x2, |
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T10_PI_TYPE3_PROTECTION = 0x3, |
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}; |
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/* |
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* T10 Protection Information tuple. |
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*/ |
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struct t10_pi_tuple { |
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__be16 guard_tag; /* Checksum */ |
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__be16 app_tag; /* Opaque storage */ |
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__be32 ref_tag; /* Target LBA or indirect LBA */ |
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}; |
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#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) |
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#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff) |
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static inline u32 t10_pi_ref_tag(struct request *rq) |
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{ |
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unsigned int shift = ilog2(queue_logical_block_size(rq->q)); |
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#ifdef CONFIG_BLK_DEV_INTEGRITY |
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if (rq->q->integrity.interval_exp) |
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shift = rq->q->integrity.interval_exp; |
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#endif |
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return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff; |
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} |
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extern const struct blk_integrity_profile t10_pi_type1_crc; |
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extern const struct blk_integrity_profile t10_pi_type1_ip; |
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extern const struct blk_integrity_profile t10_pi_type3_crc; |
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extern const struct blk_integrity_profile t10_pi_type3_ip; |
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#endif
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