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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_T10_PI_H #define _LINUX_T10_PI_H #include <linux/types.h> #include <linux/blkdev.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)); #ifdef CONFIG_BLK_DEV_INTEGRITY if (rq->q->integrity.interval_exp) shift = rq->q->integrity.interval_exp; #endif return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff; } extern const struct blk_integrity_profile t10_pi_type1_crc; extern const struct blk_integrity_profile t10_pi_type1_ip; extern const struct blk_integrity_profile t10_pi_type3_crc; extern const struct blk_integrity_profile t10_pi_type3_ip; #endif
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