Function test_single_memcpy

dpdk/app/test/test_memcpy.c:46–97

* Create two buffers, and initialise one with random values. These are copied * to the second buffer and then compared to see if the copy was successful. * The bytes outside the copied area are also checked to make sure they were not * changed. */

 * changed.
 */
static int
test_single_memcpy(unsigned int off_src, unsigned int off_dst, size_t size)
{
	unsigned int i;
	uint8_t dest[SMALL_BUFFER_SIZE + ALIGNMENT_UNIT];
	uint8_t src[SMALL_BUFFER_SIZE + ALIGNMENT_UNIT];
	void * ret;

	/* Setup buffers */
	for (i = 0; i < SMALL_BUFFER_SIZE + ALIGNMENT_UNIT; i++) {
		dest[i] = 0;
		src[i] = (uint8_t) rte_rand();
	}

	/* Do the copy */
	ret = rte_memcpy(dest + off_dst, src + off_src, size);
	if (ret != (dest + off_dst)) {
		printf("rte_memcpy() returned %p, not %p\n",
		       ret, dest + off_dst);
	}

	/* Check nothing before offset is affected */
	for (i = 0; i < off_dst; i++) {
		if (dest[i] != 0) {
			printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
			       "[modified before start of dst].\n",
			       (unsigned)size, off_src, off_dst);
			return -1;
		}
	}

	/* Check everything was copied */
	for (i = 0; i < size; i++) {
		if (dest[i + off_dst] != src[i + off_src]) {
			printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
			       "[didn't copy byte %u].\n",
			       (unsigned)size, off_src, off_dst, i);
			return -1;
		}
	}

	/* Check nothing after copy was affected */
	for (i = size; i < SMALL_BUFFER_SIZE; i++) {
		if (dest[i + off_dst] != 0) {
			printf("rte_memcpy() failed for %u bytes (offsets=%u,%u): "
			       "[copied too many].\n",
			       (unsigned)size, off_src, off_dst);
			return -1;
		}
	}
	return 0;
}

/*
 * Check functionality for various buffer sizes and data offsets/alignments.