lm_bd_chain_consume_bd
cqe = (union eth_rx_cqe *)lm_bd_chain_consume_bd(&rcq_chain->bd_chain);
elem = (union event_ring_elem *)lm_bd_chain_consume_bd(&eq_chain->bd_chain);
kcqe = (struct fcoe_kcqe *)lm_bd_chain_consume_bd(&eq_chain->bd_chain);