net/mlx5: support multiple groups and jump action

net/mlx5: support multiple groups and jump action

rte_flow has 'group' attribute and 'jump' action in order to support
multiple groups. This feature is known as multi-table support ('chain' in
linux TC flower) in general because a group means a table of flows. Example
commands are:

	flow create 0 transfer priority 1 ingress
	     pattern eth / vlan vid is 100 / end
	     actions jump group 1 / end

	flow create 0 transfer priority 1 ingress
	     pattern eth / vlan vid is 200 / end
	     actions jump group 2 / end

	flow create 0 transfer group 1 priority 2 ingress
	     pattern eth / vlan vid is 100 /
	     	     ipv4 dst spec 192.168.40.0 dst prefix 24 / end
	     actions drop / end

	flow create 0 transfer group 1 priority 2 ingress
	     pattern end
	     actions of_pop_vlan / port_id id 1 / end

	flow create 0 transfer group 2 priority 2 ingress
	     pattern eth / vlan vid is 200 /
	     	     ipv4 dst spec 192.168.40.0 dst prefix 24 / end
	     actions of_pop_vlan / port_id id 2 / end

	flow create 0 transfer group 2 priority 2 ingress
	     pattern end
	     actions port_id id 2 / end

With theses flows, if a packet having vlan 200 and src_ip as 192.168.40.1,
this packet will firstly hit the 1st flow. Then it will hit the 5th flow
because of the 'jump' action. As a result, the packet will be forwarded to
port 2 (VF representor) with vlan tag being stripped off. If the packet had
vlan 100 instead, it would be dropped by the 3rd flow.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>