nfe(4) for nVidia GigE

[Matthew Dillon]

    I found one problem, but I don't know if it will fix the TX watchdog
    timeouts.

    nfe_encap() is totally broken.  It is setting each ring segment to
    NFE_TX_VALID as it goes, before it finishes writing out all the segments.
    In fact, it seems to be setting NFE_TX_VALID before it sets the LASTFRAG
    flag!  It's amazing that it works at all.

    I am going to try to fix it.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>