371 lines
9.7 KiB
Groff
371 lines
9.7 KiB
Groff
.\" $NetBSD: le.4,v 1.22 2004/10/04 19:12:52 rumble Exp $
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.\"
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.\"-
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.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This software was developed by the Computer Systems Engineering group
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.\" at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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.\" contributed to Berkeley.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: Header: le.4,v 1.2 92/10/13 05:31:33 leres Exp
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.\" from: @(#)le.4 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD$
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.\"
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.Dd December 26, 2020
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.Dt LE 4
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.Os
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.Sh NAME
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.Nm le
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.Nd "AMD Am7900 LANCE and Am79C9xx ILACC/PCnet Ethernet interface driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device le"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_le_load="YES"
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.Ed
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.Pp
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For ISA non-PnP adapters, the port address as well as the IRQ and the DRQ
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numbers have to be specified in
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.Pa /boot/device.hints :
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.Cd hint.le.0.at="isa"
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.Cd hint.le.0.port="0x280"
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.Cd hint.le.0.irq="10"
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.Cd hint.le.0.drq="0"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for Ethernet adapters based on the
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.Tn AMD Am7990
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and
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.Tn Am79C90
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.Pq CMOS, pin-compatible
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Local Area Network Controller for Ethernet
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.Pq Tn LANCE
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chips.
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.Pp
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The
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.Nm
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driver also supports Ethernet adapters based on the
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.Tn AMD Am79C900
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Integrated Local Area Communications Controller
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.Pq Tn ILACC
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as well as the
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.Tn Am79C9xx PCnet
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family of chips, which are single-chip implementations of a
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.Tn LANCE
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chip and a DMA engine.
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The
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.Nm
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driver treats all of these
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.Tn PCI
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bus Ethernet chips as an
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.Tn AMD Am79C970 PCnet-PCI
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and does not support the additional features like the MII bus and burst mode of
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.Tn AMD Am79C971 PCnet-FAST
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and greater chips.
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.Pp
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Generally, the
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.Nm
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driver aims at supporting as many different chips on as many different
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platforms as possible,
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partially at the cost of the best performance with some of these.
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.Pp
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The
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.Nm
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driver supports reception and transmission of extended frames for
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.Xr vlan 4 .
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Selective reception of multicast Ethernet frames is provided by a 64-bit mask;
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multicast destination addresses are hashed to a bit entry using the Ethernet
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CRC function.
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.Sh HARDWARE
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.Ss ISA
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The
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.Nm
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driver supports
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.Tn ISA
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bus Ethernet adapters which are based on the following chips:
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.Pp
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.Bl -bullet -compact
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.It
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.Tn AMD Am7990 and Am79C90 LANCE
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.It
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.Tn AMD Am79C960 PCnet-ISA
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.It
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.Tn AMD Am79C961 PCnet-ISA+
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.It
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.Tn AMD Am79C961A PCnet-ISA II
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.El
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.Pp
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This includes support for the following Ethernet adapters:
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.Pp
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ISA non-PnP:
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.Pp
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.Bl -bullet -compact
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.It
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.Tn BICC Isolan
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.\" .It
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.\" .Tn Digital DEPCA
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.It
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.Tn Novell NE2100
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.El
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.Pp
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ISA PnP:
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.Pp
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.Bl -bullet -compact
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.It
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.Tn AMD AM1500T/AM2100
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.It
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.Tn AMD PCnet-32
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.It
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.Tn AMD PCnet-ISA
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.It
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.Tn Allied Telesyn AT-1500
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.It
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.Tn Boca LANCard Combo
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.It
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.Tn Cabletron E2100 Series DNI
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.It
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.Tn Cabletron E2200 Single Chip
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.It
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.Tn Melco Inc. LGY-IV
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.It
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.Tn Novell NE2100
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.It
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.Tn Racal InterLan EtherBlaster
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.El
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.Pp
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The
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.Nm
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driver does not support the selection of media types and options via
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.Xr ifconfig 8
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with
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.Tn ISA
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bus Ethernet adapters.
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.Ss PCI
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The
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.Tn PCI
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bus Ethernet chips supported by the
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.Nm
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driver are:
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.Pp
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.Bl -bullet -compact
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.It
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.Tn AMD Am53C974/Am79C970/Am79C974 PCnet-PCI
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.It
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.Tn AMD Am79C970A PCnet-PCI II
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.It
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.Tn AMD Am79C971 PCnet-FAST
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.It
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.Tn AMD Am79C972 PCnet-FAST+
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.It
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.Tn AMD Am79C973/Am79C975 PCnet-FAST III
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.It
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.Tn AMD Am79C976 PCnet-PRO
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.It
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.Tn AMD Am79C978 PCnet-Home
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.El
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.Pp
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This includes support for the following Ethernet adapters:
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.Pp
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.Bl -bullet -compact
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.It
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.Tn AcerLAN NIC P20
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.It
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.Tn Allied Telesyn AT-2450 and AT-2700 series
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.It
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.Tn VMware emulated AMD Am79C970A PCnet-PCI II interface
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.El
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.Pp
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The
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.Nm
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driver supports the selection of the following media types via
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.Xr ifconfig 8
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with
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.Tn PCI
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bus Ethernet adapters:
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.Bl -tag -width ".Cm 10base5/AUI"
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.It Cm autoselect
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Enable autoselection of the media type.
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.It Cm 10baseT/UTP
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Select UTP media.
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.It Cm 10base5/AUI
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Select AUI/BNC media.
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.El
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.Pp
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The following media option is supported with these media types:
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.Bl -tag -width ".Cm full-duplex"
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.It Cm full-duplex
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Select full duplex operation.
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.El
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.Pp
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Note that the
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.Nm
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driver does not support selecting 100Mbps (Fast Ethernet) media types.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "le%d: overflow"
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More packets came in from the Ethernet than there was space in the
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.Tn LANCE
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receive buffers.
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Packets were missed.
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.It "le%d: receive buffer error"
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The
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.Tn LANCE
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ran out of buffer space, packet dropped.
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.It "le%d: lost carrier"
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The Ethernet carrier disappeared during an attempt to transmit.
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The
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.Tn LANCE
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will finish transmitting the current packet,
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but will not automatically retry transmission if there is a collision.
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.It "le%d: excessive collisions, tdr %d"
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The Ethernet was extremely busy or jammed,
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outbound packets were dropped after 16 attempts to retransmit.
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.Pp
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TDR
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is the abbreviation of
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.Qq Time Domain Reflectometry .
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The optionally reported TDR value is an internal counter of the interval
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between the start of a transmission and the occurrence of a collision.
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This value can be used to determine the distance from the Ethernet tap to
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the point on the Ethernet cable that is shorted or open (unterminated).
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.It "le%d: dropping chained buffer"
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A packet did not fit into a single receive buffer and was dropped.
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Since the
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.Nm
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driver allocates buffers large enough to receive maximum sized Ethernet
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packets, this means some other station on the LAN transmitted a packet
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larger than allowed by the Ethernet standard.
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.It "le%d: transmit buffer error"
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The
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.Tn LANCE
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ran out of buffer space before finishing the transmission of a packet.
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If this error occurs, the driver software has a bug.
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.It "le%d: underflow"
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The
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.Tn LANCE
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ran out of buffer space before finishing the transmission of a packet.
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If this error occurs, the driver software has a bug.
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.It "le%d: controller failed to initialize"
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Driver failed to start the
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.Tn LANCE .
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This is potentially a hardware failure.
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.It "le%d: memory error"
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RAM failed to respond within the timeout when the
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.Tn LANCE
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wanted to read or write it.
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This is potentially a hardware failure.
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.It "le%d: receiver disabled"
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The receiver of the
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.Tn LANCE
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was turned off due to an error.
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.It "le%d: transmitter disabled"
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The transmitter of the
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.Tn LANCE
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was turned off due to an error.
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.El
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.Sh SEE ALSO
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.Xr altq 4 ,
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.Xr arp 4 ,
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.Xr intro 4 ,
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.Xr netintro 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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driver was ported from
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.Nx
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and first appeared in
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.Fx 6.1 .
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The
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.Nx
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version in turn was derived from the
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.Nm
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driver which first appeared in
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.Bx 4.4 .
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.Sh AUTHORS
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The
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.Nm
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driver was ported by
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.An Marius Strobl Aq Mt marius@FreeBSD.org .
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.\" .Sh BUGS
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.\" The Am7990 Revision C chips have a bug which causes garbage to be inserted
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.\" in front of the received packet occasionally.
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.\" The work-around is to ignore packets with an invalid destination address
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.\" (garbage will usually not match), by double-checking the destination
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.\" address of every packet in the driver.
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.\" This work-around can be enabled with the
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.\" .Dv LANCE_REVC_BUG
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.\" kernel option.
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.\" .Pp
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.\" When
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.\" .Dv LANCE_REVC_BUG
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.\" is enabled, the
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.\" .Nm
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.\" driver executes one or two calls to an inline Ethernet address comparison
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.\" function for every received packet.
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.\" On the
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.\" .Tn MC68000
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.\" it is exactly eight instructions of 16 bits each.
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.\" There is one comparison for each unicast packet, and two comparisons for
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.\" each broadcast packet.
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.\" .Pp
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.\" In summary, the cost of the LANCE_REVC_BUG option is:
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.\" .Bl -enum -compact
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.\" .It
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.\" loss of multicast support, and
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.\" .It
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.\" eight extra
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.\" .Tn CPU
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.\" instructions per received packet, sometimes sixteen, depending on both the
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.\" processor, and the type of packet.
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.\" .El
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.\" .Pp
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.\" All sun3 systems are presumed to have this bad revision of the Am7990,
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.\" until proven otherwise.
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.\" Alas, the only way to prove what revision of the chip is in a particular
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.\" system is inspection of the date code on the chip package,
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.\" to compare against a list of what chip revisions were fabricated between
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.\" which dates.
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.\" .Pp
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.\" Alas, the Am7990 chip is so old that
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.\" .Tn AMD
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.\" has
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.\" .Qq de-archived
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.\" the production information about it; pending a search elsewhere, we do not
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.\" know how to identify the revision C chip from the date codes.
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