NFRAMES
sc->rftail = ( sc->rftail + 1 ) % NFRAMES;
sc->rfhead = ( sc->rfhead + 1 ) % NFRAMES;
i = (i + 1) % NFRAMES;
u_long rframes[NFRAMES];
for ( i=0; i<NFRAMES; i++ )
host2ie(sc, (char *)&rfd, sc->rframes[NFRAMES-1], sizeof rfd );
sc->rftail = NFRAMES-1;