calc_idx
idx = NEXT_DESP_IDX(ring->calc_idx, ring->dma_size);
mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
idx = NEXT_DESP_IDX(ring->calc_idx, ring->dma_size);
ring->calc_idx = idx;
ring->calc_idx = rx_dma_size - 1;
mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
u16 calc_idx;
int from = calc_idx(xor->from_idx, cf->len);
int to = calc_idx(xor->to_idx, cf->len);
int res = calc_idx(xor->result_idx, cf->len);
int from = calc_idx(crc8->from_idx, cf->len);
int to = calc_idx(crc8->to_idx, cf->len);
int res = calc_idx(crc8->result_idx, cf->len);