Function rte_softrss

dpdk/lib/hash/rte_thash.h:175–190

* Generic implementation. Can be used with original rss_key * @param input_tuple * Pointer to input tuple * @param input_len * Length of input_tuple in 4-bytes chunks * @param rss_key * Pointer to RSS hash key. * @return * Calculated hash value. */

 *   Calculated hash value.
 */
static inline uint32_t
rte_softrss(uint32_t *input_tuple, uint32_t input_len,
		const uint8_t *rss_key)
{
	uint32_t i, j, map, ret = 0;

	for (j = 0; j < input_len; j++) {
		for (map = input_tuple[j]; map;	map &= (map - 1)) {
			i = rte_bsf32(map);
			ret ^= rte_cpu_to_be_32(((const uint32_t *)rss_key)[j]) << (31 - i) |
					(uint32_t)((uint64_t)(rte_cpu_to_be_32(((const uint32_t *)rss_key)[j + 1])) >>
					(i + 1));
		}
	}
	return ret;
}

/**
 * Optimized implementation.