> Date: Tue, 1 Dec 2015 19:30:44 +0100
> From: Claudio Jeker <cje...@diehard.n-r-g.com>
>
> Use m_defrag in fxp to make it nicer and simpler.
>
> works for me with
> fxp0 at pci6 dev 6 function 0 "Intel 8255x" rev 0x08, i82559: apic 6 int 21,
> address 00:d0:b7:4c:36:c4
> inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4
>
> It would be possible to drop the mbuf on error and then the ifq_deq_begin
> and ifq_deq_rollback dance could be even more simplified.
ok kettenis@
> Index: dev/ic/fxp.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/ic/fxp.c,v
> retrieving revision 1.127
> diff -u -p -r1.127 fxp.c
> --- dev/ic/fxp.c 25 Nov 2015 03:09:58 -0000 1.127
> +++ dev/ic/fxp.c 1 Dec 2015 13:52:53 -0000
> @@ -673,8 +673,8 @@ fxp_start(struct ifnet *ifp)
> struct fxp_softc *sc = ifp->if_softc;
> struct fxp_txsw *txs = sc->sc_cbt_prod;
> struct fxp_cb_tx *txc;
> - struct mbuf *m0, *m = NULL;
> - int cnt = sc->sc_cbt_cnt, seg;
> + struct mbuf *m0;
> + int cnt = sc->sc_cbt_cnt, seg, error;
>
> if (!(ifp->if_flags & IFF_RUNNING) || ifq_is_oactive(&ifp->if_snd))
> return;
> @@ -691,38 +691,22 @@ fxp_start(struct ifnet *ifp)
> if (m0 == NULL)
> break;
>
> - if (bus_dmamap_load_mbuf(sc->sc_dmat, txs->tx_map,
> - m0, BUS_DMA_NOWAIT) != 0) {
> - MGETHDR(m, M_DONTWAIT, MT_DATA);
> - if (m == NULL) {
> - ifq_deq_rollback(&ifp->if_snd, m0);
> - break;
> - }
> - if (m0->m_pkthdr.len > MHLEN) {
> - MCLGET(m, M_DONTWAIT);
> - if (!(m->m_flags & M_EXT)) {
> - m_freem(m);
> - ifq_deq_rollback(&ifp->if_snd, m0);
> - break;
> - }
> - }
> - m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m, caddr_t));
> - m->m_pkthdr.len = m->m_len = m0->m_pkthdr.len;
> - if (bus_dmamap_load_mbuf(sc->sc_dmat, txs->tx_map,
> - m, BUS_DMA_NOWAIT) != 0) {
> - m_freem(m);
> + error = bus_dmamap_load_mbuf(sc->sc_dmat, txs->tx_map,
> + m0, BUS_DMA_NOWAIT);
> + if (error == EFBIG) {
> + if (m_defrag(m0, M_DONTWAIT)) {
> ifq_deq_rollback(&ifp->if_snd, m0);
> break;
> }
> + error = bus_dmamap_load_mbuf(sc->sc_dmat, txs->tx_map,
> + m0, BUS_DMA_NOWAIT);
> }
> -
> - ifq_deq_commit(&ifp->if_snd, m0);
> - if (m != NULL) {
> - m_freem(m0);
> - m0 = m;
> - m = NULL;
> + if (error != 0) {
> + ifq_deq_rollback(&ifp->if_snd, m0);
> + break;
> }
>
> + ifq_deq_commit(&ifp->if_snd, m0);
> txs->tx_mbuf = m0;
>
> #if NBPFILTER > 0
>
>
