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Diffstat (limited to 'lib/crc16_kunit.c')
| -rw-r--r-- | lib/crc16_kunit.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/lib/crc16_kunit.c b/lib/crc16_kunit.c deleted file mode 100644 index 0918c98a96d2..000000000000 --- a/lib/crc16_kunit.c +++ /dev/null @@ -1,155 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * KUnits tests for CRC16. - * - * Copyright (C) 2024, LKCAMP - * Author: Vinicius Peixoto <vpeixoto@lkcamp.dev> - * Author: Fabricio Gasperin <fgasperin@lkcamp.dev> - * Author: Enzo Bertoloti <ebertoloti@lkcamp.dev> - */ -#include <kunit/test.h> -#include <linux/crc16.h> -#include <linux/prandom.h> - -#define CRC16_KUNIT_DATA_SIZE 4096 -#define CRC16_KUNIT_TEST_SIZE 100 -#define CRC16_KUNIT_SEED 0x12345678 - -/** - * struct crc16_test - CRC16 test data - * @crc: initial input value to CRC16 - * @start: Start index within the data buffer - * @length: Length of the data - */ -static struct crc16_test { - u16 crc; - u16 start; - u16 length; -} tests[CRC16_KUNIT_TEST_SIZE]; - -u8 data[CRC16_KUNIT_DATA_SIZE]; - - -/* Naive implementation of CRC16 for validation purposes */ -static inline u16 _crc16_naive_byte(u16 crc, u8 data) -{ - u8 i = 0; - - crc ^= (u16) data; - for (i = 0; i < 8; i++) { - if (crc & 0x01) - crc = (crc >> 1) ^ 0xa001; - else - crc = crc >> 1; - } - - return crc; -} - - -static inline u16 _crc16_naive(u16 crc, u8 *buffer, size_t len) -{ - while (len--) - crc = _crc16_naive_byte(crc, *buffer++); - return crc; -} - - -/* Small helper for generating pseudorandom 16-bit data */ -static inline u16 _rand16(void) -{ - static u32 rand = CRC16_KUNIT_SEED; - - rand = next_pseudo_random32(rand); - return rand & 0xFFFF; -} - - -static int crc16_init_test_data(struct kunit_suite *suite) -{ - size_t i; - - /* Fill the data buffer with random bytes */ - for (i = 0; i < CRC16_KUNIT_DATA_SIZE; i++) - data[i] = _rand16() & 0xFF; - - /* Generate random test data while ensuring the random - * start + length values won't overflow the 4096-byte - * buffer (0x7FF * 2 = 0xFFE < 0x1000) - */ - for (size_t i = 0; i < CRC16_KUNIT_TEST_SIZE; i++) { - tests[i].crc = _rand16(); - tests[i].start = _rand16() & 0x7FF; - tests[i].length = _rand16() & 0x7FF; - } - - return 0; -} - -static void crc16_test_empty(struct kunit *test) -{ - u16 crc; - - /* The result for empty data should be the same as the - * initial crc - */ - crc = crc16(0x00, data, 0); - KUNIT_EXPECT_EQ(test, crc, 0); - crc = crc16(0xFF, data, 0); - KUNIT_EXPECT_EQ(test, crc, 0xFF); -} - -static void crc16_test_correctness(struct kunit *test) -{ - size_t i; - u16 crc, crc_naive; - - for (i = 0; i < CRC16_KUNIT_TEST_SIZE; i++) { - /* Compare results with the naive crc16 implementation */ - crc = crc16(tests[i].crc, data + tests[i].start, - tests[i].length); - crc_naive = _crc16_naive(tests[i].crc, data + tests[i].start, - tests[i].length); - KUNIT_EXPECT_EQ(test, crc, crc_naive); - } -} - - -static void crc16_test_combine(struct kunit *test) -{ - size_t i, j; - u16 crc, crc_naive; - - /* Make sure that combining two consecutive crc16 calculations - * yields the same result as calculating the crc16 for the whole thing - */ - for (i = 0; i < CRC16_KUNIT_TEST_SIZE; i++) { - crc_naive = crc16(tests[i].crc, data + tests[i].start, tests[i].length); - for (j = 0; j < tests[i].length; j++) { - crc = crc16(tests[i].crc, data + tests[i].start, j); - crc = crc16(crc, data + tests[i].start + j, tests[i].length - j); - KUNIT_EXPECT_EQ(test, crc, crc_naive); - } - } -} - - -static struct kunit_case crc16_test_cases[] = { - KUNIT_CASE(crc16_test_empty), - KUNIT_CASE(crc16_test_combine), - KUNIT_CASE(crc16_test_correctness), - {}, -}; - -static struct kunit_suite crc16_test_suite = { - .name = "crc16", - .test_cases = crc16_test_cases, - .suite_init = crc16_init_test_data, -}; -kunit_test_suite(crc16_test_suite); - -MODULE_AUTHOR("Fabricio Gasperin <fgasperin@lkcamp.dev>"); -MODULE_AUTHOR("Vinicius Peixoto <vpeixoto@lkcamp.dev>"); -MODULE_AUTHOR("Enzo Bertoloti <ebertoloti@lkcamp.dev>"); -MODULE_DESCRIPTION("Unit tests for crc16"); -MODULE_LICENSE("GPL"); |