pppoe_ifindex
ret->pppoe_ifindex == ifindex)
ret->pppoe_ifindex == po->pppoe_ifindex)
ret->pppoe_ifindex == ifindex) {
po->pppoe_ifindex);
po->pppoe_pa.remote, po->pppoe_ifindex);
po->pppoe_ifindex = 0;
po->pppoe_ifindex = dev->ifindex;
po->pppoe_pa.remote, po->pppoe_ifindex);