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which it replaces. The new driver supports all of the chips supported by the ones it replaces, as well as many DEC/Intel 21143 10/100 cards. This also completes my quest to convert things to miibus and add Alpha support.
323 lines
11 KiB
Groff
323 lines
11 KiB
Groff
.\" Copyright (c) 1997, 1998, 1999
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.\" Bill Paul <wpaul@ee.columbia.edu>. 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 Bill Paul.
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.\" 4. Neither the name of the author nor the names of any co-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 Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
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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
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.\" THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 20, 1999
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.Dt DC 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm dc
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.Nd
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DEC/Intel 21143 and clone 10/100 ethernet driver
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.Sh SYNOPSIS
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.Cd "controller miibus0"
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.Cd "device dc0"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for several PCI fast ethernet adapters and
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embedded controllers based on the following chipsets:
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.Pp
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.Bl -bullet -compact -offset indent
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.It
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DEC/Intel 21143
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.It
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Macronix 98713, 98713A, 98715, 98715A and 98725
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.It
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Davicom DM9100 and DM9102
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.It
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ASIX Electronics AX88140A and AX88141
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.It
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ADMtek AL981 Comet and AN985 Centaur
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.It
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Lite-On 82c168 and 82c169 PNIC
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.It
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Lite-On/Macronix 82c115 PNIC II
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.El
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.Pp
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All of these chips have the same general register layout, DMA
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descriptor format and method of operation. All of the clone chips
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are based on the 21143 design with various modifications. The
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21143 itself has support for 10baseT, BNC, AUI, MII and symbol
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media attachments, 10 and 100Mbps speeds in full or half duplex,
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built in NWAY autonegotiation and wake on LAN. The 21143 also
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offers several receive filter programming options including
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perfect filtering, inverse perfect filtering and hash table
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filtering.
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.Pp
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Some clone chips duplicate the 21143 fairly closely while others
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only maintain superficial simularities. Some support only MII
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media attachments. Others use different receiver filter programming
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mechanisms. At least one supports only chained DMA descriptors
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(most support both chained descriptors and contiguously allocated
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fixed size rings). Some chips (especially the PNIC) also have
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peculiar bugs. The
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.Nm
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driver does its best to provide generalized support for all
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of these chipsets in order to keep special case code to a minimun.
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.Pp
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These chips are used by many vendors which makes it
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difficult provide a complete list of all supported cards. The
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following NICs are known to work with the
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.Nm
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driver at this time:
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.Pp
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.Bl -bullet -compact -offset indent
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.It
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Digital DE500-BA 10/100 (21143, non-MII)
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.It
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Built in DE500-BA on DEC Alpha workstations (21143, non-MII)
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.It
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Kingston KNE100TX (21143, MII)
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.It
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D-Link DFE-570TX (21143, MII, quad port)
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.It
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NDC SOHOware SFA110 (98513A)
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.It
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SVEC PN102-TX (98713)
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.It
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CNet Pro120A (98715A or 9713A) and CNet Pro120B (98715)
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.It
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Compex RL100-TX (98713 or 98713A)
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.It
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LinkSys LNE100TX (PNIC 82c168, 82c169)
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.It
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NetGear FA310-TX Rev. D1, D2 or D3 (PNIC 82c169)
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.It
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Matrox FastNIC 10/100 (PNIC 82c168, 82c169)
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.It
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Kingston KNE110TX (PNIC 82c169)
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.It
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LinkSys LNE100TX v2.0 (PNIC II 82c115)
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.It
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Jaton XpressNet (Davicom DM9102)
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.It
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Alfa Inc GFC2204 (ASIX AX88140A)
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.It
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CNet Pro110B (ASIX AX88140A)
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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 following media types:
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.Pp
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.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
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.It autoselect
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Enable autoselection of the media type and options.
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The user can manually override
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the autoselected mode by adding media options to the
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.Pa /etc/rc.conf
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file.
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.Pp
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Note: the built-in NWAY autonegotiation on the original PNIC 82c168
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chip is horribly broken and is not supported by the
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.Nm
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driver at this time: the chip will operate in any speed or duplex
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mode, however these must be set manually. The original 82c168 appears
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on very early revisions of the LinkSys LNE100TX and Matrox FastNIC.
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.It 10baseT/UTP
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Set 10Mbps operation. The
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.Ar mediaopt
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option can also be used to enable
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.Ar full-duplex
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operation. Not specifying
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.Ar full duplex
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implies
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.Ar half-duplex
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mode.
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.It 100baseTX
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Set 100Mbps (fast ethernet) operation. The
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.Ar mediaopt
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option can also be used to enable
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.Ar full-duplex
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operation. Not specifying
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.Ar full duplex
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implies
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.Ar half-duplex
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mode.
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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 following media options:
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.Pp
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.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
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.It full-duplex
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Force full duplex operation. The interface will operate in
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half duplex mode if this media option is not specified.
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.El
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.Pp
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Note that the 100baseTX media type may not be available on certain
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Intel 21143 adapters which support 10mbps media attachments only.
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "dc%d: couldn't map ports/memory"
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A fatal initialization error has occurred.
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.It "dc%d: couldn't map interrupt"
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A fatal initialization error has occurred.
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.It "dc%d: watchdog timeout"
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A packet was queued for transmission and a transmit command was
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issued, however the device failed to acknowledge the transmission
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before a timeout expired. This can happen if the device is unable
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to deliver interrupts for some reason, of if there is a problem with
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the network connection (cable).
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.It "dc%d: no memory for rx list"
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The driver failed to allocate an mbuf for the receiver ring.
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.It "dc%d: TX underrun -- increasing TX threshold"
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The device generated a transmit underrun error while attempting to
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DMA and transmit a packet. This happens if the host is not able to
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DMA the packet data into the NIC's FIFO fast enough. The driver
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will dynamically increase the transmit start threshold so that
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more data must be DMAed into the FIFO before the NIC will start
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transmitting it onto the wire.
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.It "dc%d: TX underrun -- using store and forward mode"
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The device continued to generate transmit underruns even after all
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possible transmit start threshold settings had been tried, so the
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driver programmed the chip for store and forward mode. In this mode,
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the NIC will not begin transmission until the entire packet has been
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transfered into its FIFO memory.
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.It "dc%d: chip is in D3 power state -- setting to D0"
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This message applies only to adapters which support power
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management. Some operating systems place the controller in low power
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mode when shutting down, and some PCI BIOSes fail to bring the chip
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out of this state before configuring it. The controller loses all of
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its PCI configuration in the D3 state, so if the BIOS does not set
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it back to full power mode in time, it won't be able to configure it
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correctly. The driver tries to detect this condition and bring
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the adapter back to the D0 (full power) state, but this may not be
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enough to return the driver to a fully operational condition. If
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you see this message at boot time and the driver fails to attach
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the device as a network interface, you will have to perform second
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warm boot to have the device properly configured.
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.Pp
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Note that this condition only occurs when warm booting from another
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operating system. If you power down your system prior to booting
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.Fx ,
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the card should be configured correctly.
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.El
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.Sh SEE ALSO
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.Xr arp 4 ,
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.Xr netintro 4 ,
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.Xr ifconfig 8
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.Rs
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.%T ADMtek AL981, AL983 and AL985 data sheets
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.%O http://www.admtek.com.tw
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.Re
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.Rs
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.%T ASIX Electronics AX88140A and AX88141 data sheets
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.%O http://www.asix.com.tw
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.Re
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.Rs
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.%T Davicom DM9102 data sheet
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.%O http://www.davicom8.com
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.Re
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.Rs
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.%T Intel 21143 Hardware Reference Manual
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.%O http://developer.intel.com
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.Re
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.Rs
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.%T Macronix 98713/A, 98715/A and 98725 data sheets
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.%O http://www.macronix.com
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.Re
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.Rs
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.%T Macronix 98713/A and 98715/A app notes
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.%O http://www.macronix.com
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.Re
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 4.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Bill Paul Aq wpaul@ee.columbia.edu .
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.Sh BUGS
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The Macronix application notes claim that in order to put the
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chips in normal operation, the driver must write a certian magic
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number into the CSR16 register. The numbers are documented in
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the app notes, but the exact meaning of the bits is not.
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.Pp
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The 98713A seems to have a problem with 10Mbps full duplex mode.
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The transmitter works but the receiver tends to produce many
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unexplained errors leading to very poor overall performance. The
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98715A does not exhibit this problem. All other modes on the
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98713A seem to work correctly.
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.Pp
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The original 82c168 PNIC chip has built in NWAY support which is
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used on certain early LinkSys LNE100TX and Matrox FastNIC cards,
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however it is horribly broken and difficult to use reliably.
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Consequently, autonegotiation is not currently supported for this
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chipset: the driver defaults the NIC to 10baseT half duplex, and it's
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up to the operator to manually select a different mode if necessary.
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(Later cards use an external MII transceiver to implement NWAY
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autonegotiation and work correctly.)
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.Pp
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The
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.Nm
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driver programs 82c168 and 82c169 PNIC chips to use the store and
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forward setting for the transmit start threshold by default. This
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is to work around problems with some NIC/PCI bus combinations where
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the PNIC can transmit corrupt frames when operating at 100Mbps,
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probably due to PCI DMA burst transfer errors.
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.Pp
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The 82c168 abd 82c169 PNIC chips also have a receiver bug that
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sometimes manifests during periods of heavy receive and transmit
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activity, where the chip will improperly DMA received frames to
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the host. The chips appear to upload several kilobytes of garbage
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data along with the received frame data, dirtying several RX buffers
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instead of just the expected one. The
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.Nm
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driver detects this condition and will salvage the frame, however
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it incurs a serious performance penalty in the process.
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.Pp
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The PNIC chips also sometimes generate a transmit underrun error when
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the driver attempts to download the receiver filter setup frame, which
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can result in the receive filter being incorrectly programmed. The
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.Nm
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driver will watch for this condition and requeue the setup frame until
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it is transfered successfully.
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.Pp
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The ADMtek AL981 chip (and possibly the AN985 as well) has been observed
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to sometimes wedge on transmit: this appears to happen when the driver
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queues a sequence of frames which cause it to wrap from the end of the
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the transmit descriptor ring back to the beginning. The
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.Nm
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driver attempts to avoid this condition by not queing any frames past
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the end of the transmit ring during a single invocation of the
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.Fn dc_start
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routine. This workaround has a negligible impact on transmit performance.
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