get_next_index
producer = get_next_index(producer, adapter->MaxTxDescCount);
producer = get_next_index(producer, MaxTxDescCount);
adapter->cmdProducer = get_next_index(producer, MaxTxDescCount);
last_consumer = get_next_index(last_consumer,
producer = get_next_index(producer, rcv_desc->MaxRxDescCount);