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lib/crc_kunit.c: add test and benchmark for crc7_be()

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Wire up crc7_be() to crc_kunit.  Previously it had no test.

Link: https://lore.kernel.org/r/20250304223943.157493-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2025-03-04 14:39:43 -08:00
parent 5aebe00b2f
commit 7715f8cfe5
2 changed files with 34 additions and 2 deletions
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1
lib/Kconfig.debug
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@ -2852,6 +2852,7 @@ config CRC_KUNIT_TEST
tristate "KUnit tests for CRC functions" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
select CRC7
select CRC16
select CRC_T10DIF
select CRC32

35
lib/crc_kunit.c
View file

@ -7,6 +7,7 @@
* Author: Eric Biggers <ebiggers@google.com>
*/
#include <kunit/test.h>
#include <linux/crc7.h>
#include <linux/crc16.h>
#include <linux/crc-t10dif.h>
#include <linux/crc32.h>
@ -32,8 +33,9 @@ static size_t test_buflen;
* @poly: The generator polynomial with the highest-order term omitted.
* Bit-reversed if @le is true.
* @func: The function to compute a CRC. The type signature uses u64 so that it
* can fit any CRC up to CRC-64. The function is expected to *not*
* invert the CRC at the beginning and end.
* can fit any CRC up to CRC-64. The CRC is passed in, and is expected
* to be returned in, the least significant bits of the u64. The
* function is expected to *not* invert the CRC at the beginning and end.
* @combine_func: Optional function to combine two CRCs.
*/
struct crc_variant {
@ -252,6 +254,33 @@ crc_benchmark(struct kunit *test,
}
}
/* crc7_be */
static u64 crc7_be_wrapper(u64 crc, const u8 *p, size_t len)
{
/*
* crc7_be() left-aligns the 7-bit CRC in a u8, whereas the test wants a
* right-aligned CRC (in a u64). Convert between the conventions.
*/
return crc7_be(crc << 1, p, len) >> 1;
}
static const struct crc_variant crc_variant_crc7_be = {
.bits = 7,
.poly = 0x9,
.func = crc7_be_wrapper,
};
static void crc7_be_test(struct kunit *test)
{
crc_test(test, &crc_variant_crc7_be);
}
static void crc7_be_benchmark(struct kunit *test)
{
crc_benchmark(test, crc7_be_wrapper);
}
/* crc16 */
static u64 crc16_wrapper(u64 crc, const u8 *p, size_t len)
@ -434,6 +463,8 @@ static void crc64_nvme_benchmark(struct kunit *test)
}
static struct kunit_case crc_test_cases[] = {
KUNIT_CASE(crc7_be_test),
KUNIT_CASE(crc7_be_benchmark),
KUNIT_CASE(crc16_test),
KUNIT_CASE(crc16_benchmark),
KUNIT_CASE(crc_t10dif_test),