linux/include/linux/t10-pi.h

/* 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 Protection Information tuple.
 */
struct t10_pi_tuple { … };

#define T10_PI_APP_ESCAPE …
#define T10_PI_REF_ESCAPE …

static inline u32 t10_pi_ref_tag(struct request *rq)
{ … }

struct crc64_pi_tuple { … };

/**
 * lower_48_bits() - return bits 0-47 of a number
 * @n: the number we're accessing
 */
static inline u64 lower_48_bits(u64 n)
{ … }

static inline u64 ext_pi_ref_tag(struct request *rq)
{ … }

#endif