bpfif
sc->sc_bus->bpfif = bpfsattach(&sc->sc_bus->bpf, sc->sc_dev.dv_xname,
bpfsdetach(sc->sc_bus->bpfif);
void *bpfif;
struct bpfif *bif, *bif0;
struct bpfif *bif;
bpfif_open(struct bpfif *bif)
struct bpfif *bif = arg;
TAILQ_ENTRY(bpfif) bif_entry;
TAILQ_HEAD(bpfif_list, bpfif);
static void bpfif_open(struct bpfif *);