iwl_txq_get_first_tb_dma
iwl_txq_gen2_set_tb(trans, tfd, iwl_txq_get_first_tb_dma(txq, idx),
tb_phys = iwl_txq_get_first_tb_dma(txq, idx);
tb_phys = iwl_txq_get_first_tb_dma(txq, idx);
iwl_txq_get_first_tb_dma(txq, idx),
tb0_phys = iwl_txq_get_first_tb_dma(txq, txq->write_ptr);