1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_T10_PI_H
3 #define _LINUX_T10_PI_H
5 #include <linux/types.h>
6 #include <linux/blkdev.h>
9 * A T10 PI-capable target device can be formatted with different
10 * protection schemes. Currently 0 through 3 are defined:
12 * Type 0 is regular (unprotected) I/O
14 * Type 1 defines the contents of the guard and reference tags
16 * Type 2 defines the contents of the guard and reference tags and
17 * uses 32-byte commands to seed the latter
19 * Type 3 defines the contents of the guard tag only
22 T10_PI_TYPE0_PROTECTION = 0x0,
23 T10_PI_TYPE1_PROTECTION = 0x1,
24 T10_PI_TYPE2_PROTECTION = 0x2,
25 T10_PI_TYPE3_PROTECTION = 0x3,
29 * T10 Protection Information tuple.
32 __be16 guard_tag; /* Checksum */
33 __be16 app_tag; /* Opaque storage */
34 __be32 ref_tag; /* Target LBA or indirect LBA */
37 #define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
38 #define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)
40 extern const struct blk_integrity_profile t10_pi_type1_crc;
41 extern const struct blk_integrity_profile t10_pi_type1_ip;
42 extern const struct blk_integrity_profile t10_pi_type3_crc;
43 extern const struct blk_integrity_profile t10_pi_type3_ip;