PSE_PPE_DROP
mtk_w32(eth, 0x00002300, PSE_PPE_DROP(0));
mtk_w32(eth, 0x00002300, PSE_PPE_DROP(1));
mtk_w32(eth, 0x00002300, PSE_PPE_DROP(2));
mtk_w32(eth, 0x00000300, PSE_PPE_DROP(0));