YGE_STAT_RING_CNT
rv = yge_alloc_ring(NULL, dev, &dev->d_status_ring, YGE_STAT_RING_CNT);
YGE_INC(cons, YGE_STAT_RING_CNT);
CSR_WRITE_2(dev, STAT_LAST_IDX, YGE_STAT_RING_CNT - 1);