TG3_RX_RCB_RING_SIZE
(TG3_RX_RCB_RING_SIZE << BDINFO_FLAGS_MAXLEN_SHIFT),
tp->rx_rcb_ptr = (tp->rx_rcb_ptr + 1) % TG3_RX_RCB_RING_SIZE;
#define TG3_RX_RCB_RING_BYTES (sizeof(struct tg3_rx_buffer_desc) * TG3_RX_RCB_RING_SIZE)
struct tg3_rx_buffer_desc rx_rcb[TG3_RX_RCB_RING_SIZE];