Function awg_newbuf_rx

freebsd/arm/allwinner/if_awg.c:746–782

}

static int
awg_newbuf_rx(struct awg_softc *sc, int index)
{
	struct mbuf *m;
	bus_dma_segment_t seg;
	bus_dmamap_t map;
	int nsegs;

	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
	if (m == NULL)
		return (ENOBUFS);

	m->m_pkthdr.len = m->m_len = m->m_ext.ext_size;
	m_adj(m, ETHER_ALIGN);

	if (bus_dmamap_load_mbuf_sg(sc->rx.buf_tag, sc->rx.buf_spare_map,
	    m, &seg, &nsegs, BUS_DMA_NOWAIT) != 0) {
		m_freem(m);
		return (ENOBUFS);
	}

	if (sc->rx.buf_map[index].mbuf != NULL) {
		bus_dmamap_sync(sc->rx.buf_tag, sc->rx.buf_map[index].map,
		    BUS_DMASYNC_POSTREAD);
		bus_dmamap_unload(sc->rx.buf_tag, sc->rx.buf_map[index].map);
	}
	map = sc->rx.buf_map[index].map;
	sc->rx.buf_map[index].map = sc->rx.buf_spare_map;
	sc->rx.buf_spare_map = map;
	bus_dmamap_sync(sc->rx.buf_tag, sc->rx.buf_map[index].map,
	    BUS_DMASYNC_PREREAD);

	sc->rx.buf_map[index].mbuf = m;
	awg_setup_rxdesc(sc, index, seg.ds_addr);

	return (0);
}

static void
awg_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)