LTR_SNOOP_EN
r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);
r8168_mac_ocp_modify(tp, LTR_SNOOP, 0x0000, LTR_SNOOP_EN);