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util/crc16: Add spdk_crc16_t10dif_copy to use in read strip and write insert

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For DIF and DIX, read strip and write insert operation will copy
data together with DIF generation and verification.

This patch adds spdk_crc16_t10dif_copy for those cases.

Change-Id: I9a77fa8b367486fe0b6704d58dcdf95d5210c875
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/437461
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Shuhei Matsumoto 2018-12-17 17:34:45 +09:00 committed by Jim Harris
parent f0e00ef287
commit 3947bc2492
3 changed files with 55 additions and 1 deletions
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12
include/spdk/crc16.h
View File

@ -59,6 +59,18 @@ extern "C" {
* \return CRC-16 value.
*/
uint16_t spdk_crc16_t10dif(uint16_t init_crc, const void *buf, size_t len);
/**
* Calculate T10-DIF CRC-16 checksum and copy data.
*
* \param init_crc Initial CRC-16 value.
* \param dst Destination data buffer for copy.
* \param src Source data buffer for CRC calculation and copy.
* \param len Length of buffer in bytes.
* \return CRC-16 value.
*/
uint16_t spdk_crc16_t10dif_copy(uint16_t init_crc, uint8_t *dst, uint8_t *src,
size_t len);
#ifdef __cplusplus
}
#endif

22
lib/util/crc16.c
View File

@ -53,3 +53,25 @@ spdk_crc16_t10dif(uint16_t init_crc, const void *buf, size_t len)
}
return (uint16_t)rem;
}
uint16_t
spdk_crc16_t10dif_copy(uint16_t init_crc, uint8_t *dst, uint8_t *src,
size_t len)
{
uint32_t j, rem;
size_t i;
uint16_t poly = SPDK_T10DIF_CRC16_POLYNOMIAL;
rem = init_crc;
for (i = 0; i < len; i++) {
rem = rem ^ (src[i] << 8);
dst[i] = src[i];
for (j = 0; j < 8; j++) {
rem = rem << 1;
rem = (rem & 0x10000) ? rem ^ poly : rem;
}
}
return (uint16_t)rem;
}

22
test/unit/lib/util/crc16.c/crc16_ut.c
View File

@ -59,6 +59,25 @@ test_crc16_t10dif_seed(void)
CU_ASSERT(crc == 0xd0db);
}
static void
test_crc16_t10dif_copy(void)
{
uint16_t crc1 = 0, crc2;
char buf1[] = "1234";
char buf2[] = "56789";
char *buf3 = calloc(1, strlen(buf1) + strlen(buf2) + 1);
SPDK_CU_ASSERT_FATAL(buf3 != NULL);
crc1 = spdk_crc16_t10dif_copy(crc1, buf3, buf1, strlen(buf1));
crc1 = spdk_crc16_t10dif_copy(crc1, buf3 + strlen(buf1), buf2, strlen(buf2));
CU_ASSERT(crc1 == 0xd0db);
crc2 = spdk_crc16_t10dif(0, buf3, strlen(buf3));
CU_ASSERT(crc2 == 0xd0db);
free(buf3);
}
int
main(int argc, char **argv)
{
@ -77,7 +96,8 @@ main(int argc, char **argv)
if (
CU_add_test(suite, "test_crc16_t10dif", test_crc16_t10dif) == NULL ||
CU_add_test(suite, "test_crc16_t10dif_seed", test_crc16_t10dif_seed) == NULL) {
CU_add_test(suite, "test_crc16_t10dif_seed", test_crc16_t10dif_seed) == NULL ||
CU_add_test(suite, "test_crc16_t10dif_copy", test_crc16_t10dif_copy) == NULL) {
CU_cleanup_registry();
return CU_get_error();
}