1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_T10_PI_H 3#define _LINUX_T10_PI_H 4 5#include <linux/types.h> 6#include <linux/blkdev.h> 7 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 */ 21enum 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 28/* 29 * T10 Protection Information tuple. 30 */ 31struct 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 37#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff) 38#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff) 39 40static inline u32 t10_pi_ref_tag(struct request *rq) 41{ 42 unsigned int shift = ilog2(queue_logical_block_size(rq->q)); 43 44#ifdef CONFIG_BLK_DEV_INTEGRITY 45 if (rq->q->integrity.interval_exp) 46 shift = rq->q->integrity.interval_exp; 47#endif 48 return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff; 49} 50 51extern const struct blk_integrity_profile t10_pi_type1_crc; 52extern const struct blk_integrity_profile t10_pi_type1_ip; 53extern const struct blk_integrity_profile t10_pi_type3_crc; 54extern const struct blk_integrity_profile t10_pi_type3_ip; 55 56#endif 57