AE_RXD_PADDING
NULL, NULL, AE_RXD_COUNT_DEFAULT * 1536 + AE_RXD_PADDING, 1,
AE_RXD_COUNT_DEFAULT * 1536 + AE_RXD_PADDING, 0, NULL, NULL,
sc->rxd_base_dma, AE_RXD_COUNT_DEFAULT * 1536 + AE_RXD_PADDING,
sc->dma_rxd_busaddr = busaddr + AE_RXD_PADDING;
sc->rxd_base = (ae_rxd_t *)(sc->rxd_base_dma + AE_RXD_PADDING);
bzero(sc->rxd_base_dma, AE_RXD_COUNT_DEFAULT * 1536 + AE_RXD_PADDING);