NetBSD/share/man/man4/kse.4

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.\" $NetBSD: kse.4,v 1.9 2009/10/21 00:30:43 snj Exp $
.\"
.\" Copyright (c) 2006 Tohru Nishimura.
.\"
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.Dd July 6, 2006
.Dt KSE 4
.Os
.Sh NAME
.Nm kse
.Nd Micrel 8842/8841 PCI Ethernet controller driver
.Sh SYNOPSIS
.Cd "kse* at pci? dev ? function ?"
.Sh DESCRIPTION
The
.Nm
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
.Nm
driver distinguishes and handles them according to the HW model.
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr netintro 4 ,
.Xr pci 4 ,
.Xr ifconfig 8
.Sh AUTHORS
The
.Nm
driver was written by
.An Tohru Nishimura .
.Sh BUGS
__STRICT_ALIGNMENT case is not written.
8842 media selection keeps
.Dq auto
and indicates
.Dq 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
.Nm
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.