rxdma_mailbox_t
rx_mbox_cntl_alloc_size = sizeof (rxdma_mailbox_t);
hxge_setup_dma_common(dmap, cntl_dmap, 1, sizeof (rxdma_mailbox_t));
rx_cntl_alloc_size += sizeof (rxdma_mailbox_t);
nxge_setup_dma_common(dmap, cntl_dmap, 1, sizeof (rxdma_mailbox_t));