1#ifndef _LINUX_T10_PI_H
 2#define _LINUX_T10_PI_H
 3
 4#include <linux/types.h>
 5#include <linux/blkdev.h>
 6
 7/*
 8 * A T10 PI-capable target device can be formatted with different
 9 * protection schemes.	Currently 0 through 3 are defined:
10 *
11 * Type 0 is regular (unprotected) I/O
12 *
13 * Type 1 defines the contents of the guard and reference tags
14 *
15 * Type 2 defines the contents of the guard and reference tags and
16 * uses 32-byte commands to seed the latter
17 *
18 * Type 3 defines the contents of the guard tag only
19 */
20enum t10_dif_type {
21	T10_PI_TYPE0_PROTECTION = 0x0,
22	T10_PI_TYPE1_PROTECTION = 0x1,
23	T10_PI_TYPE2_PROTECTION = 0x2,
24	T10_PI_TYPE3_PROTECTION = 0x3,
25};
26
27/*
28 * T10 Protection Information tuple.
29 */
30struct t10_pi_tuple {
31	__be16 guard_tag;	/* Checksum */
32	__be16 app_tag;		/* Opaque storage */
33	__be32 ref_tag;		/* Target LBA or indirect LBA */
34};
35
36
37extern struct blk_integrity_profile t10_pi_type1_crc;
38extern struct blk_integrity_profile t10_pi_type1_ip;
39extern struct blk_integrity_profile t10_pi_type3_crc;
40extern struct blk_integrity_profile t10_pi_type3_ip;
41
42#endif