From cbc0a40e17da361a2ada8d669413ccfbd2028f2d Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Thu, 3 Mar 2022 12:13:09 -0800 Subject: lib: add rocksoft model crc64 The NVM Express specification extended data integrity fields to 64 bits using the Rocksoft parameters. Add the poly to the crc64 table generation, and provide a generic library routine implementing the algorithm. The Rocksoft 64-bit CRC model parameters are as follows: Poly: 0xAD93D23594C93659 Initial value: 0xFFFFFFFFFFFFFFFF Reflected Input: True Reflected Output: True Xor Final: 0xFFFFFFFFFFFFFFFF Since this model used reflected bits, the implementation generates the reflected table so the result is ordered consistently. Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Martin K. Petersen Signed-off-by: Keith Busch Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20220303201312.3255347-6-kbusch@kernel.org Signed-off-by: Jens Axboe --- include/linux/crc64.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/crc64.h b/include/linux/crc64.h index c756e65a1b58..9480f38cc7cf 100644 --- a/include/linux/crc64.h +++ b/include/linux/crc64.h @@ -8,4 +8,6 @@ #include u64 __pure crc64_be(u64 crc, const void *p, size_t len); +u64 __pure crc64_rocksoft_generic(u64 crc, const void *p, size_t len); + #endif /* _LINUX_CRC64_H */ -- cgit v1.2.3