Function calc_drop_prob

dpdk/app/test/test_red.c:214–229

* calculate the drop probability */

 * calculate the drop probability
 */
static double calc_drop_prob(uint32_t min_th, uint32_t max_th,
			     uint32_t maxp_inv, uint32_t avg)
{
	double drop_prob = 0.0;

	if (avg < min_th) {
		drop_prob = 0.0;
	} else if (avg < max_th) {
		drop_prob = (1.0 / (double)maxp_inv)
			* ((double)(avg - min_th)
			   / (double)(max_th - min_th));
	} else {
		drop_prob = 1.0;
	}
	return drop_prob;
}

/**
 *  check if drop rate matches drop probability within tolerance