1.\" $NetBSD: kse.4,v 1.4 2006/07/06 06:20:52 wiz Exp $ 2.\" 3.\" Copyright (c) 2006 Tohru Nishimura. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by Tohru Nishimura. 16.\" 4. The name of the author may not be used to endorse or promote products 17.\" derived from this software without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd July 6, 2006 31.Dt KSE 4 32.Os 33.Sh NAME 34.Nm kse 35.Nd Micrel 8842/8841 PCI Ethernet controller driver 36.Sh SYNOPSIS 37.Cd "kse* at pci? dev ? function ?" 38.Sh DESCRIPTION 39The 40.Nm 41driver supports Ethernet interfaces based on the Micrel 428842/8841 PCI Ethernet chips. 43.Sh SEE ALSO 44.Xr arp 4 , 45.Xr ifmedia 4 , 46.Xr netintro 4 , 47.Xr pci 4 , 48.Xr ifconfig 8 49.Sh AUTHORS 50The 51.Nm 52driver was written by 53.An Tohru Nishimura . 54.Sh BUGS 55The 8842 has 2 Ethernet ports which behave as a managed switch to 56bridge each other. 57It works like a T-shape connector of Ethernet data flow in which 58the Ethernet controller sits at the leg of the T. 59Frames can flow between the two ports while traffic destined 60for the 8842 reaches the EMAC. 61The 62.Nm 63driver is not aware of the second port's existence and treats the 648842 as if it was a single port 8841. 65The second port PHY is always auto select. 66The PDF documentation is unclear and inconsistent about whether 67the Rx DMA alignment restriction is removed or not. 68The __STRICT_ALIGNMENT case is not written. 69Advanced features like flow volume bound, VLAN tag insertion/removal, 70and detailed MIB counters are not implemented and remain uncontrollable 71by the 72.Nm 73driver. 74UDP4CSUM is not very useful since the HW has an implementation 75error for the case when a large UDP datagram is fragmented into 76MTU sized frames. 77