hv_handle_alloc
if (hv_handle_alloc(ch, ch->ch_ring, 2 * buflen, &ch->ch_ring_gpadl)) {
int hv_handle_alloc(struct hv_channel *, void *, uint32_t, uint32_t *);
if (hv_handle_alloc(sc->sc_chan, sc->sc_rx_ring, sc->sc_rx_size,