dma_port_read
ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), ports[i],
ret = dma_port_read(sw->tb->ctl, &in, tb_route(sw), dma->port,
ret = dma_port_read(sw->tb->ctl, &out, tb_route(sw), dma->port,
return dma_port_read(sw->tb->ctl, buf, tb_route(sw), dma->port,
ret = dma_port_read(sw->tb->ctl, &out, tb_route(sw), dma->port,