RL_RXBUFLEN
limit = CSR_READ_2(sc, RL_CURRXBUF) % RL_RXBUFLEN;
max_bytes = (RL_RXBUFLEN - cur_rx) + limit;
((cur_rx + sizeof(uint32_t)) % RL_RXBUFLEN);
if (rxbufpos == (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN))
wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
RL_RXBUFLEN + 1518, BUS_DMA_WAITOK, &dmem);
RL_RXBUFLEN;