bge_npoll
ifp->if_npoll = bge_npoll;
ifpoll_compat_setup(&sc->bge_npoll, ctx, tree,
static void bge_npoll(struct ifnet *, struct ifpoll_info *);
if (sc->bge_npoll.ifpc_stcount-- == 0) {
sc->bge_npoll.ifpc_stcount = sc->bge_npoll.ifpc_stfrac;
int cpuid = sc->bge_npoll.ifpc_cpuid;
sc->bge_npoll.ifpc_stcount = 0;
struct ifpoll_compat bge_npoll; /* polling */