RE: [PATCH net] mlx4_en: set number of rx rings used by RSS using ethtool

quoted

+	/* RSS table size must be an order of 2 */
+	if (rss_rings != (1 << order_base_2(rss_rings)))
+		return -EINVAL;

This is an obscure way to make this kind of test.

The canonical way is:

	if (is_power_of_2(rss_rings))

Which is probably (x & {x-1)) == 0

	David