TG3_RX_RING_SIZE
for (i = 0; i < TG3_RX_RING_SIZE; i++) {
tp->rx_std_ptr = (tp->rx_std_ptr + 1) % TG3_RX_RING_SIZE;
#define TG3_RX_RING_BYTES (sizeof(struct tg3_rx_buffer_desc) * TG3_RX_RING_SIZE)
struct tg3_rx_buffer_desc rx_std[TG3_RX_RING_SIZE];