156 lines
6.6 KiB
Groff
156 lines
6.6 KiB
Groff
.\" $NetBSD: we.4,v 1.13 2002/02/13 08:17:51 ross 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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.\" 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 the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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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 October 20, 1997
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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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.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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.Cd "we* at mca? slot ?"
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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. Since this makes a huge difference (see diagnostic
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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. Improper use of this flag will make the
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driver fail or send invalid 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. For example the COMPEX ENT/U boards
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identify as WD8003 compatibles, but are in fact 16bit cards.
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Using this flag on a board that really is a 8bit board will
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result 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.
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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. 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. The other media is either BNC or UTP
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behind a transceiver. Software cannot differentiate between BNC and UTP
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cards. 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. If the transceiver is active, the BNC
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media is selected. 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 's
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.Sq media
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directive. 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. The value in the kernel
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configuration file is being overridden by 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. 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. Typical memory access speed on these
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boards is about 4MB/second. These boards generally have no
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problems keeping up with full Ethernet speed and the ring-buffer
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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. This is only enough room for about 4 full-size (1500 byte)
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packets. This can sometimes be a problem, especially on the original
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WD8003E, because these boards' shared-memory access speed is quite
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slow; typically only about 1MB/second. The overhead of this slow
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memory access, and the fact that there is only room for 4 full-sized
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packets means that the ring-buffer will occasionally overrun. When
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this happens, the board must be reset to avoid a lockup problem in
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early revision 8390's. Resetting the board causes all of the data in
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the ring-buffer to be lost, requiring it to be retransmitted/received,
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congesting the board further. Because of this, maximum throughput on
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these boards is only about 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. If these cards must be used
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with NFS, use the NFS -r and -w options in /etc/fstab to limit NFS's
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packet size. 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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