kse —
Micrel 8842/8841 PCI Ethernet controller driver
kse* at pci? dev ? function ?
The kse driver supports Ethernet interfaces based on the
  Micrel 8842/8841 PCI Ethernet chips. The 8842 has 2 Ethernet ports which
  behave as a managed switch to bridge each other. It works like a T-shape
  connector of Ethernet data flow in which an Ethernet controller sits at the
  leg of the T. Frames can flow between the two ports while traffic destined for
  the 8842 reaches the EMAC. The 8841 is a plain 10/100 Ethernet. The
  kse driver distinguishes and handles them according to
  the HW model.
The kse driver was written by Tohru
  Nishimura.
__STRICT_ALIGNMENT case is not written. 8842 media selection keeps
  “auto” and indicates “up 100baseTX-FX flow” when
  either of two ports is found link-up. There is no functional provision to see
  and control the media selection of them this moment. Advanced features like
  flow volume bound, VLAN tag insertion/removal, QoS DiffServ are not
  implemented and remain uncontrollable by the kse
  driver. UDP4CSUM is not very useful since the HW has an implementation error
  for the case when a large UDP datagram is fragmented into MTU sized frames.