[SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC

The SCSI Block Protocol uses this 16-bit CRC to verify the integrity
of each data sector.  crc_t10dif() is used by sd_dif.c when performing
I/O to or from disks formatted with protection information.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 8cc8e8722a3f..c7ad7a5b3535 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -29,6 +29,13 @@ config CRC16
           the kernel tree does. Such modules that use library CRC16
           functions require M here.
 
+config CRC_T10DIF
+        tristate "CRC calculation for the T10 Data Integrity Field"
+        help
+          This option is only needed if a module that's not in the
+          kernel tree needs to calculate CRC checks for use with the
+          SCSI data integrity subsystem.
+
 config CRC_ITU_T
         tristate "CRC ITU-T V.41 functions"
         help