Has been committed.
http://www.dragonflybsd.org/cvsweb/src/sys/dev/netif/mii_layer/Makefile?rev=1.10&content-type=text/x-cvsweb-markup

Hi all,

I have ported stge(4) from FreeBSD, which supports:
     o   Antares Microsystems Gigabit Ethernet
     o   ASUS NX1101 Gigabit Ethernet
     o   D-Link DGE-550T Gigabit Ethernet
     o   IC Plus IP1000A Gigabit Ethernet
     o   Sundance ST-2021 Gigabit Ethernet
     o   Sundance ST-2023 Gigabit Ethernet
     o   Sundance TC9021 Gigabit Ethernet
     o   Tamarack TC9021 Gigabit Ethernet

Apply following patch under src/sys:
http://leaf.dragonflybsd.org/~sephe/stge.diff

Untar following tar ball under src/sys/dev/netif:
http://leaf.dragonflybsd.org/~sephe/stge.tbz
Man page is in this tar ball.

It is against HEAD, tested with a D-Link DGE-550T

Please test/review it, if no objection comes, I will commit it this weekend

Best Regards,
sephe