122 lines
3.7 KiB
Groff
122 lines
3.7 KiB
Groff
.\"
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.\" Copyright (c) 1996, 1997 Jonathan Stone.
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.\" All rights reserved.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Jonathan Stone.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $NetBSD: le.4,v 1.3 1998/03/20 13:31:57 fair Exp $
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.\"
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.Dd August 6, 1996
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.Dt LE 4 pmax
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.Os NetBSD 1.2
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.Sh NAME
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.Nm le
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.Nd
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DECstation AMD 7990 LANCE ethernet interface
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.Sh SYNOPSIS
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.Cd "le? at mainbus with le_pmax" (3100 baseboard)
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.Cd "le*? at tc with le_tc" (5000/200 baseboard)
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.Cd "le? at ioasic with le_ioasic" (ioasic baseboard)
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.Cd "le* at tc? with le_tc" (TC option cards)
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.Sh DESCRIPTION
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The
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.Nm
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driver provides access to a 10Mb/s Ethernet via the
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.Tn AMD
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7990
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.Tn LANCE
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Ethernet chip.
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All
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.Tn LANCE
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interfaces on
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.Tn DECstations
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are supported, as are interfaces on
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.Tn "Alpha AXP"
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machines with a
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.Tn TurboChannel
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bus.
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.Pp
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The
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.Nm
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driver employs the Address Resolution Protocol (ARP) described in
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.Xr arp 4
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to map between Internet and Ethernet addresses on the local network.
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.Pp
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Selective reception of multicast Ethernet frames is provided
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by a 64-bit mask; multicast destination addresses are hashed to a
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bit entry using the Ethernet CRC function.
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.Pp
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No support is provided for switching between media ports.
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The
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.Tn DECstation
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3100 provides both AUI and BNC (thinwire or 10base2) connectors.
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Port selection is via a manual switch and is not software configurable.
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.Pp
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The
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.Tn DECstation
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model 5000/200
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.Tn PMAD-AA
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baseboard device provides only a BNC connector.
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.Pp
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The
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.Nm ioasic
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baseboard devices and the
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.Tn PMAD-AA
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.Tn TurboChannel
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option card provide only an AUI port.
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.Pp
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr inet 4 ,
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.Xr tc 4 ,
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.Xr ioasic 4 ,
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.Xr arp 4 .
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.Sh BUGS
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On all front-ends, performance is impaired by hardware which
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forces a software copy of packets to and from DMA buffers.
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The
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.Nm ioasic
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machines and the
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.Tn DECstation
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3100 must
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copy packets to and from non-contiguous DMA buffers.
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The
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.Tn DECstation
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5000/200 and the
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.Tn PMAD-AA
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must copy to and from an onboard SRAM DMA buffer.
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The CPU overhead is noticeable, but all machines
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can sustain full 10 Mb/s media speed.
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.Sh HISTORY
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This
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.Nm
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driver is derived from a
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.Nm
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driver that first appeared in
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.Bx 4.4 .
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Support for multiple bus attachments first appeared in
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.Nx 1.2 .
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