netdev-offload-dpdk: Setting RSS hash types in RSS action.

When we send parallel flows such as VXLAN to a PF[1] port in OVS with
multiple PMDs. OVS will create a RTE flow with Mark and RSS actions to
send flows to the software data path. But the RSS action does not work
well and all the flows are forwarded to a single PMD. This is because
RSS hash types should be set in RSS action.

[1]: In our testbed, a Mellanox ConnectX-6 is used as a PF port.

[i.maximets]
DPDK PMD drivers supposed to provide "best-effort" RSS configuration
if the type is set to zero.  However, they are very inconsistent in
practice and barely put any effort to provide a good configuration.
For example, mlx5 driver seems to use just RTE_ETH_RSS_IP, which is
not enough for most deployments.
Setting the types the same way we configure them for a normal RSS
in netdev-dpdk to workaround the scalability issue.

Signed-off-by: Harold Huang <baymaxhuang@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

lib/netdev-offload-dpdk.c

@@ -18,6 +18,7 @@
 
 #include <sys/types.h>
 #include <netinet/ip6.h>
+#include <rte_ethdev.h>
 #include <rte_flow.h>
 #include <rte_gre.h>
 
@@ -1714,7 +1715,7 @@ add_flow_mark_rss_actions(struct flow_actions *actions,
         .conf = (struct rte_flow_action_rss) {
             .func = RTE_ETH_HASH_FUNCTION_DEFAULT,
             .level = 0,
-            .types = 0,
+            .types = RTE_ETH_RSS_IP | RTE_ETH_RSS_UDP | RTE_ETH_RSS_TCP,
             .queue_num = netdev_n_rxq(netdev),
             .queue = rss_data->queue,
             .key_len = 0,