diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-26 12:01:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-26 12:01:35 -0700 |
| commit | 3f7282139fe1594be464b90141d56738e7a0ea8a (patch) | |
| tree | 2a6dfc4449ceeee6b5509c3fcc58c33865c89af6 /lib/crc64.c | |
| parent | 752d422e74c41084c3c9c9a159cb8d2795fa0c22 (diff) | |
| parent | 1e21270685ae4c14361dd501da62cdc4be867d4e (diff) | |
| download | linux-3f7282139fe1594be464b90141d56738e7a0ea8a.tar.gz | |
Merge tag 'for-5.18/64bit-pi-2022-03-25' of git://git.kernel.dk/linux-block
Pull block layer 64-bit data integrity support from Jens Axboe:
"This adds support for 64-bit data integrity in the block layer and in
NVMe"
* tag 'for-5.18/64bit-pi-2022-03-25' of git://git.kernel.dk/linux-block:
crypto: fix crc64 testmgr digest byte order
nvme: add support for enhanced metadata
block: add pi for extended integrity
crypto: add rocksoft 64b crc guard tag framework
lib: add rocksoft model crc64
linux/kernel: introduce lower_48_bits function
asm-generic: introduce be48 unaligned accessors
nvme: allow integrity on extended metadata formats
block: support pi with extended metadata
Diffstat (limited to 'lib/crc64.c')
| -rw-r--r-- | lib/crc64.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/crc64.c b/lib/crc64.c index 9f852a89ee2a1e..61ae8dfb6a1c59 100644 --- a/lib/crc64.c +++ b/lib/crc64.c @@ -22,6 +22,13 @@ * x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 + * x^7 + x^4 + x + 1 * + * crc64rocksoft[256] table is from the Rocksoft specification polynomial + * defined as, + * + * x^64 + x^63 + x^61 + x^59 + x^58 + x^56 + x^55 + x^52 + x^49 + x^48 + x^47 + + * x^46 + x^44 + x^41 + x^37 + x^36 + x^34 + x^32 + x^31 + x^28 + x^26 + x^23 + + * x^22 + x^19 + x^16 + x^13 + x^12 + x^10 + x^9 + x^6 + x^4 + x^3 + 1 + * * Copyright 2018 SUSE Linux. * Author: Coly Li <colyli@suse.de> */ @@ -55,3 +62,24 @@ u64 __pure crc64_be(u64 crc, const void *p, size_t len) return crc; } EXPORT_SYMBOL_GPL(crc64_be); + +/** + * crc64_rocksoft_generic - Calculate bitwise Rocksoft CRC64 + * @crc: seed value for computation. 0 for a new CRC calculation, or the + * previous crc64 value if computing incrementally. + * @p: pointer to buffer over which CRC64 is run + * @len: length of buffer @p + */ +u64 __pure crc64_rocksoft_generic(u64 crc, const void *p, size_t len) +{ + const unsigned char *_p = p; + size_t i; + + crc = ~crc; + + for (i = 0; i < len; i++) + crc = (crc >> 8) ^ crc64rocksofttable[(crc & 0xff) ^ *_p++]; + + return ~crc; +} +EXPORT_SYMBOL_GPL(crc64_rocksoft_generic); |