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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/blk-mq.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;
- struct crc64_pi_tuple {
- __be64 guard_tag;
- __be16 app_tag;
- __u8 ref_tag[6];
- };
- /**
- * lower_48_bits() - return bits 0-47 of a number
- * @n: the number we're accessing
- */
- static inline u64 lower_48_bits(u64 n)
- {
- return n & ((1ull << 48) - 1);
- }
- static inline u64 ext_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 lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT));
- }
- extern const struct blk_integrity_profile ext_pi_type1_crc64;
- extern const struct blk_integrity_profile ext_pi_type3_crc64;
- #endif
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