efx_tc_flow_block
static int efx_tc_flow_block(enum tc_setup_type type, void *type_data,
nf_flow_table_offload_del_cb(zone->nf_ft, efx_tc_flow_block, zone);
rc = nf_flow_table_offload_add_cb(ct_ft, efx_tc_flow_block, ct_zone);
nf_flow_table_offload_del_cb(ct_zone->nf_ft, efx_tc_flow_block, ct_zone);