mcp_dma_addr_t
rx_ring_entries = sc->rx_ring_size / sizeof (mcp_dma_addr_t);
max_intr_slots = 2 * (sc->rx_ring_size / sizeof (mcp_dma_addr_t));
max_intr_slots = 2 * (cmd.data0 / sizeof (mcp_dma_addr_t));