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TOMOYO Linux Cross Reference
Linux/include/linux/t10-pi.h

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  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  */
 21 enum 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  */
 31 struct 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 
 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;
 44 
 45 #endif
 46 

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