[PATCH 30/31] FreeBSD OFED support for DPDK MLX5 PMD a) Allow verbs applications packet steering of GRE tunneled traffic. Adding GRE flow specification based on RFC 2890. GRE consists of flags, protocol and key fields. IPv4 protocol 47 (IPPROTO_GRE) can be used when GRE packets are encapsulated in IPv4. b) verbs: Add MPLS flow specification filter Add MPLS flow specification based on RFC 3032. MPLS spec defined with label field which includes the label value and additional parameters such as: BoS, TC and TTL. MPLS allows stacking multiple labels in sequence. In addition, the MPLS header can be encapsulated on top of different layers, e.g.: ETH, IP (rfc4023), UDP (rfc7510), GRE (rfc4023). Therefore, when using the flow creation verb, the application should organize the spec filters list in the command in an ordered manner, such that reflects the actual protocol stack of the packet, to determine the exact position of the MPLS headers in the protocol stack. c) mlx5: Report MPLS tunnel offload capabilities through mlx5 direct verbs This patch exposes the mlx5 device's capability to offload MPLS based tunnel protocols via DV API. The possible protocols are: - Control word + MPLS over GRE. - Control word + MPLS over UDP. Differential revision: https://reviews.freebsd.org/D32205 MFC after: 1 month