When adding a RSS rule with pattern MAC_PPPOE_IPV4_UDP and input
set SRC/DST IPV4, because of incomplete protocol header fields,
the rule can't do hash with inner src/dst ipv4. PPPOE_IPV4_TCP/SCTP
and PPPOE_IPV6_UDP/TCP/SCTP also have similar issues. This patch
complements protocol header fields for PPPOE data packets.