+/**
+ * Convert verbs RSS types to their DPDK equivalents.
+ *
+ * This function returns a group of RSS DPDK types given their equivalent group
+ * of verbs types.
+ * For example both source IPv4 and destination IPv4 verbs types are converted
+ * into their equivalent RSS group types. If each of these verbs types existed
+ * exclusively - no conversion would take place.
+ *
+ * @param types
+ * RSS hash types in verbs format.
+ *
+ * @return
+ * DPDK RSS hash fields supported by mlx4.
+ */
+uint64_t
+mlx4_ibv_to_rss_types(uint64_t types)
+{
+ enum { IPV4, IPV6, IPV4_TCP, IPV6_TCP, IPV4_UDP, IPV6_UDP};
+
+ static const uint64_t in[] = {
+ [IPV4] = MLX4_IBV_IPV4_HF,
+ [IPV6] = MLX4_IBV_IPV6_HF,
+ [IPV4_TCP] = MLX4_IBV_IPV4_HF | MLX4_IBV_TCP_HF,
+ [IPV6_TCP] = MLX4_IBV_IPV6_HF | MLX4_IBV_TCP_HF,
+ [IPV4_UDP] = MLX4_IBV_IPV4_HF | MLX4_IBV_UDP_HF,
+ [IPV6_UDP] = MLX4_IBV_IPV6_HF | MLX4_IBV_UDP_HF,
+ };
+ static const uint64_t out[RTE_DIM(in)] = {
+ [IPV4] = MLX4_RSS_IPV4_HF,
+ [IPV6] = MLX4_RSS_IPV6_HF,
+ [IPV4_TCP] = MLX4_RSS_IPV4_HF | MLX4_RSS_IPV4_TCP_HF,
+ [IPV6_TCP] = MLX4_RSS_IPV6_HF | MLX4_RSS_IPV6_TCP_HF,
+ [IPV4_UDP] = MLX4_RSS_IPV4_HF | MLX4_RSS_IPV4_UDP_HF,
+ [IPV6_UDP] = MLX4_RSS_IPV6_HF | MLX4_RSS_IPV6_UDP_HF,
+ };
+ uint64_t conv = 0;
+ unsigned int i;
+
+ for (i = 0; i != RTE_DIM(in); ++i)
+ if ((types & in[i]) == in[i])
+ conv |= out[i];
+ return conv;
+}
+