AR5008_MAX_SCATTER
size = ATHN_NTXBUFS * AR5008_MAX_SCATTER * sizeof(struct ar_tx_desc);
AR5008_MAX_SCATTER, ATHN_TXBUFSZ, 0, BUS_DMA_NOWAIT,
&((struct ar_tx_desc *)sc->descs)[i * AR5008_MAX_SCATTER];
i * AR5008_MAX_SCATTER * sizeof(struct ar_tx_desc);
ATHN_NTXBUFS * AR5008_MAX_SCATTER *