Provide a module to test the rocksoft crc64 calculations with well known inputs and exepected values. Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx> --- v1->v2: Fixed Kconfig dependency lib/Kconfig.debug | 4 +++ lib/Makefile | 1 + lib/test_crc64.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 73 insertions(+) create mode 100644 lib/test_crc64.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 14b89aa37c5c..149de11ae903 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2214,6 +2214,10 @@ config TEST_UUID config TEST_XARRAY tristate "Test the XArray code at runtime" +config TEST_CRC64 + depends on CRC64 + tristate "Test the crc64 code at runtime" + config TEST_OVERFLOW tristate "Test check_*_overflow() functions at runtime" diff --git a/lib/Makefile b/lib/Makefile index 300f569c626b..e100a4d6a950 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -103,6 +103,7 @@ obj-$(CONFIG_TEST_HMM) += test_hmm.o obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o +obj-$(CONFIG_TEST_CRC64) += test_crc64.o # # CFLAGS for compiling floating point code inside the kernel. x86/Makefile turns # off the generation of FPU/SSE* instructions for kernel proper but FPU_FLAGS diff --git a/lib/test_crc64.c b/lib/test_crc64.c new file mode 100644 index 000000000000..283fef8f110e --- /dev/null +++ b/lib/test_crc64.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Tests were selected from NVM Express NVM Command Set Specification 1.0a, + * section 5.2.1.3.5 "64b CRC Test Cases" available here: + * + * https://nvmexpress.org/wp-content/uploads/NVMe-NVM-Command-Set-Specification-1.0a-2021.07.26-Ratified.pdf + * + * Copyright 2022 Keith Busch <kbusch@xxxxxxxxxx> + */ + +#include <linux/crc64.h> +#include <linux/module.h> + +static unsigned int tests_passed; +static unsigned int tests_run; + +#define ALL_ZEROS 0x6482D367EB22B64EULL +#define ALL_FFS 0xC0DDBA7302ECA3ACULL +#define INC 0x3E729F5F6750449CULL +#define DEC 0x9A2DF64B8E9E517EULL + +static u8 buffer[4096]; + +#define CRC_CHECK(c, v) do { \ + tests_run++; \ + if (c != v) \ + printk("BUG at %s:%d expected:%llx got:%llx\n", \ + __func__, __LINE__, v, c); \ + else \ + tests_passed++; \ +} while (0) + + +static int crc_tests(void) +{ + __u64 crc; + int i; + + memset(buffer, 0, sizeof(buffer)); + crc = crc64_rocksoft(~0ULL, buffer, 4096); + CRC_CHECK(crc, ALL_ZEROS); + + memset(buffer, 0xff, sizeof(buffer)); + crc = crc64_rocksoft(~0ULL, buffer, 4096); + CRC_CHECK(crc, ALL_FFS); + + for (i = 0; i < 4096; i++) + buffer[i] = i & 0xff; + crc = crc64_rocksoft(~0ULL, buffer, 4096); + CRC_CHECK(crc, INC); + + for (i = 0; i < 4096; i++) + buffer[i] = 0xff - (i & 0xff); + crc = crc64_rocksoft(~0ULL, buffer, 4096); + CRC_CHECK(crc, DEC); + + printk("CRC64: %u of %u tests passed\n", tests_passed, tests_run); + return (tests_run == tests_passed) ? 0 : -EINVAL; +} + +static void crc_exit(void) +{ +} + +module_init(crc_tests); +module_exit(crc_exit); +MODULE_AUTHOR("Keith Busch <kbusch@xxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.25.4
