lib/crc64: rename CRC64-Rocksoft to CRC64-NVME

This CRC64 variant comes from the NVME NVM Command Set Specification
(https://nvmexpress.org/wp-content/uploads/NVM-Express-NVM-Command-Set-Specification-1.0e-2024.07.29-Ratified.pdf).

The "Rocksoft Model CRC Algorithm", published in 1993 and available at
https://www.zlib.net/crc_v3.txt, is a generalized CRC algorithm that can
calculate any variant of CRC, given a list of parameters such as
polynomial, bit order, etc.  It is not a CRC variant.

The NVME NVM Command Set Specification has a table that gives the
"Rocksoft Model Parameters" for the CRC variant it uses.  When support
for this CRC variant was added to Linux, this table seems to have been
misinterpreted as naming the CRC variant the "Rocksoft" CRC.  In fact,
the table names the CRC variant as the "NVM Express 64b CRC".

Most implementations of this CRC variant outside Linux have been calling
it CRC64-NVME.  Therefore, update Linux to match.

While at it, remove the superfluous "update" from the function name, so
crc64_rocksoft_update() is now just crc64_nvme(), matching most of the
other CRC library functions.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20250130035130.180676-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/lib/gen_crc64table.c b/lib/gen_crc64table.c
index 55e222acd0b8..e05a4230a0a0 100644
--- a/lib/gen_crc64table.c
+++ b/lib/gen_crc64table.c
@@ -17,10 +17,10 @@
 #include <stdio.h>
 
 #define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
-#define CRC64_ROCKSOFT_POLY 0x9A6C9329AC4BC9B5ULL
+#define CRC64_NVME_POLY 0x9A6C9329AC4BC9B5ULL
 
 static uint64_t crc64_table[256] = {0};
-static uint64_t crc64_rocksoft_table[256] = {0};
+static uint64_t crc64_nvme_table[256] = {0};
 
 static void generate_reflected_crc64_table(uint64_t table[256], uint64_t poly)
 {
@@ -82,14 +82,14 @@ static void print_crc64_tables(void)
 	printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
 	output_table(crc64_table);
 
-	printf("\nstatic const u64 ____cacheline_aligned crc64rocksofttable[256] = {\n");
-	output_table(crc64_rocksoft_table);
+	printf("\nstatic const u64 ____cacheline_aligned crc64nvmetable[256] = {\n");
+	output_table(crc64_nvme_table);
 }
 
 int main(int argc, char *argv[])
 {
 	generate_crc64_table(crc64_table, CRC64_ECMA182_POLY);
-	generate_reflected_crc64_table(crc64_rocksoft_table, CRC64_ROCKSOFT_POLY);
+	generate_reflected_crc64_table(crc64_nvme_table, CRC64_NVME_POLY);
 	print_crc64_tables();
 	return 0;
 }