lance_get
return lance_get(pkt, len) ? len : -1;
extern bool lance_get(void *, size_t);
bool lance_get(void *, size_t);
len = lance_get(cookie, pkt, len);
int lance_get(void *, void *, size_t);
integrate struct mbuf *lance_get(struct lance_softc *, int, int);
m = lance_get(sc, boff, len);