Fix Emulex "oce" driver in CURRENT

Hello,
I had problems during some experiments with Emulex and "oce" driver in
CURRENT.
I found several bugs in the "oce" driver and this patch fixes them.

- oce_multiq_start(): if the link is down returns ENXIO without consuming
the mbuf.
  A trivial fix is to remove the initial error check, since
oce_multiq_transmit() which is
  called next handles the link down situation correctly.
- oce_multiq_transmit(): there is an extra call to drbr_enqueue() causing
the
  mbuf to be enqueued twice when the NIC's queue is full.
- oce_multiq_transmit(): same problem fixed recently in ixgbe (r267187) and
other drivers:
  if the mbuf is enqueued, the proper return value is 0

This patch has been reviewed by luigi (in cc).

If someone could have a look on this and give me some feedback it would be
great.

Regards,
Stefano Garzarella



 diff --git a/sys/dev/oce/oce_if.c b/sys/dev/oce/oce_if.c
 index 70d6393..af57491 100644
 --- a/sys/dev/oce/oce_if.c
 +++ b/sys/dev/oce/oce_if.c
 _at__at_ -563,9 +563,6 _at__at_ oce_multiq_start(struct ifnet *ifp, struct mbuf *m)
     int queue_index = 0;
     int status = 0;

 -   if (!sc->link_status)
 -       return ENXIO;
 -
     if ((m->m_flags & M_FLOWID) != 0)
         queue_index = m->m_pkthdr.flowid % sc->nwqs;

 _at__at_ -1274,7 +1271,6 _at__at_ oce_multiq_transmit(struct ifnet *ifp, struct mbuf
*m, struct oce_wq *wq)
                 drbr_putback(ifp, br, next);
                 wq->tx_stats.tx_stops ++;
                 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
 -               status = drbr_enqueue(ifp, br, next);
             }
             break;
         }
 _at__at_ -1285,7 +1281,7 _at__at_ oce_multiq_transmit(struct ifnet *ifp, struct mbuf
*m, struct oce_wq *wq)
         ETHER_BPF_MTAP(ifp, next);
     }

 -   return status;
 +   return 0;
  }