r256827:
  Correct MAC revision bits. Previously it always cleared bit 20 and
  bit 21.
Approved by:	re (delphij)
MFC r256828:
  Add preliminary support for RTL8106E PCIe FastEthernet.
Approved by:	re (delphij)
MFC r257304:
  Add support for new Gigabit PHY of RealTek.
  I don't have a copy of data sheet so I'm not sure exact PHY model
  name. Vendor's web page indicates RTL8251 is latest PHY so I used
  the name. This PHY is used with RTL8168G, RTL8168GU and RTL8411B.
Approved by:	re (delphij)
MFC r257305:
  Add preliminary support for RTL8168G, RTL8168GU and RTL8411B.
  RTL8168GU has two variants(GMII and MII) but it uses the same chip
  revision id.  Driver checks PCI device id of controller and
  sets internal capability flag(i.e. jumbo frame and link speed down
  in WOL).
Approved by:	re (delphij)
MFC r257306:
  Add preliminary support for RTL8168EP.
Approved by:	re (delphij)