172 lines
6.3 KiB
Groff
172 lines
6.3 KiB
Groff
.\" $NetBSD: we.4,v 1.18 2010/03/23 16:03:33 wiz Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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.\" NASA Ames Research Center.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 23, 2010
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.Dt WE 4
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.Os
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.Sh NAME
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.Nm we
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.Nd "Western Digital/SMC WD80x3, SMC Elite Ultra, and SMC EtherEZ Ethernet cards device driver"
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.Sh SYNOPSIS
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.Ss ISA boards
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.Cd "we0 at isa? port 0x280 iomem 0xd0000 irq 9"
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.Cd "we1 at isa? port 0x300 iomem 0xcc000 irq 10"
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.Ss MCA boards
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.Cd "we* at mca? slot ?"
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.Ss atari
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.Cd "we0 at vme0 irq 4 # SMC Elite Ultra with SMC_TT VME-ISA bridge"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports Western Digital/SMC WD80x3, SMC Elite Ultra, and
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SMC EtherEZ Ethernet cards.
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.Sh FLAG VALUES
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For some clone boards the driver is not able to recognize 16bit or 8bit
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interfaces correctly.
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Since this makes a huge difference (see diagnostic section below)
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you can override this by specifying flags value in the config file:
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.Pp
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.Cd "we2 at isa? port 0x300 iomem 0xe0000 irq 15 flags 4"
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.Pp
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The values to add together for flags are:
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.Pp
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.Bl -diag
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.It 2
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force adapter to be treated as 8bit, even if it probes
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as a 16bit interface.
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Improper use of this flag will make the driver fail or send invalid
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Ethernet packets.
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.It 4
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force adapter to be treated as 16bit, even if it probes
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as a 8bit interface.
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For example the COMPEX ENT/U boards identify as WD8003 compatibles,
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but are in fact 16bit cards.
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Using this flag on a board that really is a 8bit board will result
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in bogus packets being sent.
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.It 8
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disable the use of double transmit buffers to save space in
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the on-board RAM for more receive buffers.
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.El
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.Pp
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Note that all supported MCA cards are 16bit, and the SMC_TT VME-ISA bridge
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interface for atari supports only SMC Elite Ultra.
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.Sh MEDIA SELECTION
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The ability to select media from software is dependent on the particular
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model of WD/SMC card.
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The following models support only manual configuration:
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WD8003S, WD8003E, and WD8013EBT.
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.Pp
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Other WD/SMC 80x3 interfaces support two types of media on a single card.
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All support the AUI media type.
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The other media is either BNC or UTP behind a transceiver.
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Software cannot differentiate between BNC and UTP cards.
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On some models, the AUI port is always active.
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.Pp
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The SMC Elite Ultra and SMC EtherEZ interfaces support three media
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a single card: AUI, BNC, and UTP.
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If the transceiver is active, the BNC media is selected.
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Otherwise, the AUI and UTP ports are both active.
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.Pp
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To enable the AUI media, select the
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.Em 10base5
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or
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.Em aui
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media type with
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.Xr ifconfig 8 Ns 's
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.Cm media
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directive.
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To select the other media (transceiver), select the
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.Em 10base2
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or
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.Em bnc
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media type.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "we0: overriding IRQ \*[Lt]n\*[Gt] to \*[Lt]m\*[Gt]"
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The IRQ specified in the kernel configuration file is different from that
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found in the card's configuration registers.
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The value in the kernel configuration file is being overridden by
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the one configured into the card.
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.It "we0: can't wildcard IRQ on a \*[Lt]model\*[Gt]"
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The IRQ was wildcarded in the kernel configuration file, and the card is
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a WD8003S, WD8003E, or WD8013EBT, which do not support software IRQ
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configuration.
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.It "we0: failed to clear shared memory at offset \*[Lt]off\*[Gt]"
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The memory test was unable to clear the interface's shared memory
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region.
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This often indicates that the card is configured at a conflicting
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.Em iomem
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address.
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.It we0: warning - receiver ring buffer overrun
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The DP8390 Ethernet chip used by this board implements a shared-memory
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ring-buffer to store incoming packets.
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.Pp
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The 16bit boards (8013 series) have 16k of memory as well as
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fast memory access speed.
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Typical memory access speed on these boards is about 4MB/second.
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These boards generally have no problems keeping up with full Ethernet
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speed and the ring-buffer seldom overfills.
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.Pp
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However, the 8bit boards (8003) usually have only 8k bytes of shared
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memory.
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This is only enough room for about 4 full-size (1500 byte) packets.
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This can sometimes be a problem, especially on the original WD8003E,
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because these boards' shared-memory access speed is quite slow;
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typically only about 1MB/second.
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The overhead of this slow memory access, and the fact that there
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is only room for 4 full-sized packets means that the ring-buffer
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will occasionally overrun.
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When this happens, the board must be reset to avoid a lockup problem
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in early revision 8390's.
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Resetting the board causes all of the data in the ring-buffer to
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be lost, requiring it to be retransmitted/received, congesting the
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board further.
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Because of this, maximum throughput on these boards is only about
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400-600k per second.
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.Pp
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This problem is exasperated by NFS because the 8bit boards lack
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sufficient memory to support the default 8k byte packets that NFS and
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other protocols use as their default.
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If these cards must be used with NFS, use the NFS
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.Fl r
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and
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.Fl w
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options in
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.Pa /etc/fstab
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to limit NFS's packet size.
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4096 byte packets generally work.
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.El
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.Sh SEE ALSO
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.Xr ifmedia 4 ,
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.Xr intro 4 ,
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.Xr isa 4 ,
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.Xr mca 4 ,
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.Xr ifconfig 8
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