There are two methods for received L4 checksum error packet from Fman ports,
1. Disable Fman L3/L4 checksum. Unset "DEV_RX_OFFLOAD_CHECKSUM" of "port_conf.rxmode.offloads" to disable L3/L4 checksum for Fman when compile l3fwd application.
2. Receive the checksum error packets to error FQ with the attached patch.