556 lines
24 KiB
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556 lines
24 KiB
Text
----------------------------------------------------------------------------
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NOTE: See also arcnet-hardware.txt in this directory for jumper-setting
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and cabling information if you're like many of us and didn't happen to get a
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manual with your ARCnet card.
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----------------------------------------------------------------------------
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Since no one seems to listen to me otherwise, perhaps a poem will get your
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attention:
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This driver's getting fat and beefy,
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But my cat is still named Fifi.
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Hmm, I think I'm allowed to call that a poem, even though it's only two
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lines. Hey, I'm in Computer Science, not English. Give me a break.
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The point is: I REALLY REALLY REALLY REALLY REALLY want to hear from you if
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you test this and get it working. Or if you don't. Or anything.
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ARCnet 0.32 ALPHA first made it into the Linux kernel 1.1.80 - this was
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nice, but after that even FEWER people started writing to me because they
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didn't even have to install the patch. <sigh>
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Come on, be a sport! Send me a success report!
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(hey, that was even better than my original poem... this is getting bad!)
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--------
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WARNING:
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--------
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If you don't e-mail me about your success/failure soon, I may be forced to
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start SINGING. And we don't want that, do we?
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(You know, it might be argued that I'm pushing this point a little too much.
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If you think so, why not flame me in a quick little e-mail? Please also
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include the type of card(s) you're using, software, size of network, and
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whether it's working or not.)
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My e-mail address is: apenwarr@worldvisions.ca
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---------------------------------------------------------------------------
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These are the ARCnet drivers for Linux.
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This new release (2.91) has been put together by David Woodhouse
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<dwmw2@infradead.org>, in an attempt to tidy up the driver after adding support
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for yet another chipset. Now the generic support has been separated from the
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individual chipset drivers, and the source files aren't quite so packed with
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#ifdefs! I've changed this file a bit, but kept it in the first person from
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Avery, because I didn't want to completely rewrite it.
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The previous release resulted from many months of on-and-off effort from me
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(Avery Pennarun), many bug reports/fixes and suggestions from others, and in
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particular a lot of input and coding from Tomasz Motylewski. Starting with
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ARCnet 2.10 ALPHA, Tomasz's all-new-and-improved RFC1051 support has been
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included and seems to be working fine!
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Where do I discuss these drivers?
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---------------------------------
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Tomasz has been so kind as to set up a new and improved mailing list.
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Subscribe by sending a message with the BODY "subscribe linux-arcnet YOUR
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REAL NAME" to listserv@tichy.ch.uj.edu.pl. Then, to submit messages to the
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list, mail to linux-arcnet@tichy.ch.uj.edu.pl.
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There are archives of the mailing list at:
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http://epistolary.org/mailman/listinfo.cgi/arcnet
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The people on linux-net@vger.kernel.org (now defunct, replaced by
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netdev@vger.kernel.org) have also been known to be very helpful, especially
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when we're talking about ALPHA Linux kernels that may or may not work right
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in the first place.
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Other Drivers and Info
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----------------------
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You can try my ARCNET page on the World Wide Web at:
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http://www.qis.net/~jschmitz/arcnet/
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Also, SMC (one of the companies that makes ARCnet cards) has a WWW site you
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might be interested in, which includes several drivers for various cards
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including ARCnet. Try:
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http://www.smc.com/
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Performance Technologies makes various network software that supports
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ARCnet:
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http://www.perftech.com/ or ftp to ftp.perftech.com.
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Novell makes a networking stack for DOS which includes ARCnet drivers. Try
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FTPing to ftp.novell.com.
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You can get the Crynwr packet driver collection (including arcether.com, the
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one you'll want to use with ARCnet cards) from
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oak.oakland.edu:/simtel/msdos/pktdrvr. It won't work perfectly on a 386+
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without patches, though, and also doesn't like several cards. Fixed
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versions are available on my WWW page, or via e-mail if you don't have WWW
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access.
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Installing the Driver
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---------------------
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All you will need to do in order to install the driver is:
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make config
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(be sure to choose ARCnet in the network devices
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and at least one chipset driver.)
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make clean
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make zImage
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If you obtained this ARCnet package as an upgrade to the ARCnet driver in
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your current kernel, you will need to first copy arcnet.c over the one in
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the linux/drivers/net directory.
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You will know the driver is installed properly if you get some ARCnet
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messages when you reboot into the new Linux kernel.
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There are four chipset options:
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1. Standard ARCnet COM90xx chipset.
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This is the normal ARCnet card, which you've probably got. This is the only
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chipset driver which will autoprobe if not told where the card is.
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It following options on the command line:
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com90xx=[<io>[,<irq>[,<shmem>]]][,<name>] | <name>
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If you load the chipset support as a module, the options are:
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io=<io> irq=<irq> shmem=<shmem> device=<name>
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To disable the autoprobe, just specify "com90xx=" on the kernel command line.
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To specify the name alone, but allow autoprobe, just put "com90xx=<name>"
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2. ARCnet COM20020 chipset.
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This is the new chipset from SMC with support for promiscuous mode (packet
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sniffing), extra diagnostic information, etc. Unfortunately, there is no
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sensible method of autoprobing for these cards. You must specify the I/O
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address on the kernel command line.
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The command line options are:
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com20020=<io>[,<irq>[,<node_ID>[,backplane[,CKP[,timeout]]]]][,name]
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If you load the chipset support as a module, the options are:
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io=<io> irq=<irq> node=<node_ID> backplane=<backplane> clock=<CKP>
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timeout=<timeout> device=<name>
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The COM20020 chipset allows you to set the node ID in software, overriding the
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default which is still set in DIP switches on the card. If you don't have the
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COM20020 data sheets, and you don't know what the other three options refer
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to, then they won't interest you - forget them.
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3. ARCnet COM90xx chipset in IO-mapped mode.
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This will also work with the normal ARCnet cards, but doesn't use the shared
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memory. It performs less well than the above driver, but is provided in case
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you have a card which doesn't support shared memory, or (strangely) in case
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you have so many ARCnet cards in your machine that you run out of shmem slots.
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If you don't give the IO address on the kernel command line, then the driver
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will not find the card.
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The command line options are:
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com90io=<io>[,<irq>][,<name>]
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If you load the chipset support as a module, the options are:
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io=<io> irq=<irq> device=<name>
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4. ARCnet RIM I cards.
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These are COM90xx chips which are _completely_ memory mapped. The support for
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these is not tested. If you have one, please mail the author with a success
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report. All options must be specified, except the device name.
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Command line options:
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arcrimi=<shmem>,<irq>,<node_ID>[,<name>]
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If you load the chipset support as a module, the options are:
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shmem=<shmem> irq=<irq> node=<node_ID> device=<name>
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Loadable Module Support
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-----------------------
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Configure and rebuild Linux. When asked, answer 'm' to "Generic ARCnet
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support" and to support for your ARCnet chipset if you want to use the
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loadable module. You can also say 'y' to "Generic ARCnet support" and 'm'
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to the chipset support if you wish.
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make config
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make clean
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make zImage
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make modules
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If you're using a loadable module, you need to use insmod to load it, and
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you can specify various characteristics of your card on the command
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line. (In recent versions of the driver, autoprobing is much more reliable
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and works as a module, so most of this is now unnecessary.)
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For example:
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cd /usr/src/linux/modules
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insmod arcnet.o
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insmod com90xx.o
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insmod com20020.o io=0x2e0 device=eth1
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Using the Driver
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----------------
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If you build your kernel with ARCnet COM90xx support included, it should
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probe for your card automatically when you boot. If you use a different
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chipset driver complied into the kernel, you must give the necessary options
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on the kernel command line, as detailed above.
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Go read the NET-2-HOWTO and ETHERNET-HOWTO for Linux; they should be
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available where you picked up this driver. Think of your ARCnet as a
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souped-up (or down, as the case may be) Ethernet card.
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By the way, be sure to change all references from "eth0" to "arc0" in the
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HOWTOs. Remember that ARCnet isn't a "true" Ethernet, and the device name
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is DIFFERENT.
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Multiple Cards in One Computer
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------------------------------
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Linux has pretty good support for this now, but since I've been busy, the
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ARCnet driver has somewhat suffered in this respect. COM90xx support, if
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compiled into the kernel, will (try to) autodetect all the installed cards.
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If you have other cards, with support compiled into the kernel, then you can
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just repeat the options on the kernel command line, e.g.:
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LILO: linux com20020=0x2e0 com20020=0x380 com90io=0x260
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If you have the chipset support built as a loadable module, then you need to
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do something like this:
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insmod -o arc0 com90xx
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insmod -o arc1 com20020 io=0x2e0
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insmod -o arc2 com90xx
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The ARCnet drivers will now sort out their names automatically.
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How do I get it to work with...?
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--------------------------------
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NFS: Should be fine linux->linux, just pretend you're using Ethernet cards.
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oak.oakland.edu:/simtel/msdos/nfs has some nice DOS clients. There
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is also a DOS-based NFS server called SOSS. It doesn't multitask
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quite the way Linux does (actually, it doesn't multitask AT ALL) but
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you never know what you might need.
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With AmiTCP (and possibly others), you may need to set the following
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options in your Amiga nfstab: MD 1024 MR 1024 MW 1024
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(Thanks to Christian Gottschling <ferksy@indigo.tng.oche.de>
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for this.)
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Probably these refer to maximum NFS data/read/write block sizes. I
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don't know why the defaults on the Amiga didn't work; write to me if
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you know more.
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DOS: If you're using the freeware arcether.com, you might want to install
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the driver patch from my web page. It helps with PC/TCP, and also
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can get arcether to load if it timed out too quickly during
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initialization. In fact, if you use it on a 386+ you REALLY need
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the patch, really.
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Windows: See DOS :) Trumpet Winsock works fine with either the Novell or
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Arcether client, assuming you remember to load winpkt of course.
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LAN Manager and Windows for Workgroups: These programs use protocols that
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are incompatible with the Internet standard. They try to pretend
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the cards are Ethernet, and confuse everyone else on the network.
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However, v2.00 and higher of the Linux ARCnet driver supports this
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protocol via the 'arc0e' device. See the section on "Multiprotocol
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Support" for more information.
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Using the freeware Samba server and clients for Linux, you can now
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interface quite nicely with TCP/IP-based WfWg or Lan Manager
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networks.
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Windows 95: Tools are included with Win95 that let you use either the LANMAN
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style network drivers (NDIS) or Novell drivers (ODI) to handle your
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ARCnet packets. If you use ODI, you'll need to use the 'arc0'
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device with Linux. If you use NDIS, then try the 'arc0e' device.
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See the "Multiprotocol Support" section below if you need arc0e,
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you're completely insane, and/or you need to build some kind of
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hybrid network that uses both encapsulation types.
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OS/2: I've been told it works under Warp Connect with an ARCnet driver from
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SMC. You need to use the 'arc0e' interface for this. If you get
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the SMC driver to work with the TCP/IP stuff included in the
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"normal" Warp Bonus Pack, let me know.
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ftp.microsoft.com also has a freeware "Lan Manager for OS/2" client
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which should use the same protocol as WfWg does. I had no luck
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installing it under Warp, however. Please mail me with any results.
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NetBSD/AmiTCP: These use an old version of the Internet standard ARCnet
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protocol (RFC1051) which is compatible with the Linux driver v2.10
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ALPHA and above using the arc0s device. (See "Multiprotocol ARCnet"
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below.) ** Newer versions of NetBSD apparently support RFC1201.
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Using Multiprotocol ARCnet
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--------------------------
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The ARCnet driver v2.10 ALPHA supports three protocols, each on its own
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"virtual network device":
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arc0 - RFC1201 protocol, the official Internet standard which just
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happens to be 100% compatible with Novell's TRXNET driver.
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Version 1.00 of the ARCnet driver supported _only_ this
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protocol. arc0 is the fastest of the three protocols (for
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whatever reason), and allows larger packets to be used
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because it supports RFC1201 "packet splitting" operations.
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Unless you have a specific need to use a different protocol,
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I strongly suggest that you stick with this one.
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arc0e - "Ethernet-Encapsulation" which sends packets over ARCnet
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that are actually a lot like Ethernet packets, including the
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6-byte hardware addresses. This protocol is compatible with
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Microsoft's NDIS ARCnet driver, like the one in WfWg and
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LANMAN. Because the MTU of 493 is actually smaller than the
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one "required" by TCP/IP (576), there is a chance that some
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network operations will not function properly. The Linux
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TCP/IP layer can compensate in most cases, however, by
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automatically fragmenting the TCP/IP packets to make them
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fit. arc0e also works slightly more slowly than arc0, for
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reasons yet to be determined. (Probably it's the smaller
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MTU that does it.)
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arc0s - The "[s]imple" RFC1051 protocol is the "previous" Internet
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standard that is completely incompatible with the new
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standard. Some software today, however, continues to
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support the old standard (and only the old standard)
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including NetBSD and AmiTCP. RFC1051 also does not support
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RFC1201's packet splitting, and the MTU of 507 is still
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smaller than the Internet "requirement," so it's quite
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possible that you may run into problems. It's also slower
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than RFC1201 by about 25%, for the same reason as arc0e.
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The arc0s support was contributed by Tomasz Motylewski
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and modified somewhat by me. Bugs are probably my fault.
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You can choose not to compile arc0e and arc0s into the driver if you want -
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this will save you a bit of memory and avoid confusion when eg. trying to
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use the "NFS-root" stuff in recent Linux kernels.
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The arc0e and arc0s devices are created automatically when you first
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ifconfig the arc0 device. To actually use them, though, you need to also
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ifconfig the other virtual devices you need. There are a number of ways you
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can set up your network then:
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1. Single Protocol.
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This is the simplest way to configure your network: use just one of the
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two available protocols. As mentioned above, it's a good idea to use
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only arc0 unless you have a good reason (like some other software, ie.
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WfWg, that only works with arc0e).
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If you need only arc0, then the following commands should get you going:
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ifconfig arc0 MY.IP.ADD.RESS
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route add MY.IP.ADD.RESS arc0
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route add -net SUB.NET.ADD.RESS arc0
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[add other local routes here]
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If you need arc0e (and only arc0e), it's a little different:
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ifconfig arc0 MY.IP.ADD.RESS
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ifconfig arc0e MY.IP.ADD.RESS
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route add MY.IP.ADD.RESS arc0e
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route add -net SUB.NET.ADD.RESS arc0e
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arc0s works much the same way as arc0e.
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2. More than one protocol on the same wire.
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Now things start getting confusing. To even try it, you may need to be
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partly crazy. Here's what *I* did. :) Note that I don't include arc0s in
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my home network; I don't have any NetBSD or AmiTCP computers, so I only
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use arc0s during limited testing.
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I have three computers on my home network; two Linux boxes (which prefer
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RFC1201 protocol, for reasons listed above), and one XT that can't run
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Linux but runs the free Microsoft LANMAN Client instead.
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Worse, one of the Linux computers (freedom) also has a modem and acts as
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a router to my Internet provider. The other Linux box (insight) also has
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its own IP address and needs to use freedom as its default gateway. The
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XT (patience), however, does not have its own Internet IP address and so
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I assigned it one on a "private subnet" (as defined by RFC1597).
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To start with, take a simple network with just insight and freedom.
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Insight needs to:
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- talk to freedom via RFC1201 (arc0) protocol, because I like it
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more and it's faster.
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- use freedom as its Internet gateway.
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That's pretty easy to do. Set up insight like this:
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ifconfig arc0 insight
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route add insight arc0
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route add freedom arc0 /* I would use the subnet here (like I said
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to to in "single protocol" above),
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but the rest of the subnet
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unfortunately lies across the PPP
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link on freedom, which confuses
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things. */
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route add default gw freedom
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And freedom gets configured like so:
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ifconfig arc0 freedom
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route add freedom arc0
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route add insight arc0
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/* and default gateway is configured by pppd */
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Great, now insight talks to freedom directly on arc0, and sends packets
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to the Internet through freedom. If you didn't know how to do the above,
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you should probably stop reading this section now because it only gets
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worse.
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Now, how do I add patience into the network? It will be using LANMAN
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Client, which means I need the arc0e device. It needs to be able to talk
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to both insight and freedom, and also use freedom as a gateway to the
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Internet. (Recall that patience has a "private IP address" which won't
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work on the Internet; that's okay, I configured Linux IP masquerading on
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freedom for this subnet).
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So patience (necessarily; I don't have another IP number from my
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provider) has an IP address on a different subnet than freedom and
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insight, but needs to use freedom as an Internet gateway. Worse, most
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DOS networking programs, including LANMAN, have braindead networking
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schemes that rely completely on the netmask and a 'default gateway' to
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determine how to route packets. This means that to get to freedom or
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insight, patience WILL send through its default gateway, regardless of
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the fact that both freedom and insight (courtesy of the arc0e device)
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could understand a direct transmission.
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I compensate by giving freedom an extra IP address - aliased 'gatekeeper'
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- that is on my private subnet, the same subnet that patience is on. I
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then define gatekeeper to be the default gateway for patience.
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To configure freedom (in addition to the commands above):
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ifconfig arc0e gatekeeper
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route add gatekeeper arc0e
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route add patience arc0e
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This way, freedom will send all packets for patience through arc0e,
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giving its IP address as gatekeeper (on the private subnet). When it
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talks to insight or the Internet, it will use its "freedom" Internet IP
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address.
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You will notice that we haven't configured the arc0e device on insight.
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This would work, but is not really necessary, and would require me to
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assign insight another special IP number from my private subnet. Since
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both insight and patience are using freedom as their default gateway, the
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two can already talk to each other.
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It's quite fortunate that I set things up like this the first time (cough
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cough) because it's really handy when I boot insight into DOS. There, it
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runs the Novell ODI protocol stack, which only works with RFC1201 ARCnet.
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In this mode it would be impossible for insight to communicate directly
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with patience, since the Novell stack is incompatible with Microsoft's
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Ethernet-Encap. Without changing any settings on freedom or patience, I
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simply set freedom as the default gateway for insight (now in DOS,
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remember) and all the forwarding happens "automagically" between the two
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hosts that would normally not be able to communicate at all.
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For those who like diagrams, I have created two "virtual subnets" on the
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same physical ARCnet wire. You can picture it like this:
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[RFC1201 NETWORK] [ETHER-ENCAP NETWORK]
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(registered Internet subnet) (RFC1597 private subnet)
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(IP Masquerade)
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|
/---------------\ * /---------------\
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| | * | |
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| +-Freedom-*-Gatekeeper-+ |
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| | | * | |
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\-------+-------/ | * \-------+-------/
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| | |
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Insight | Patience
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(Internet)
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It works: what now?
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-------------------
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Send mail describing your setup, preferably including driver version, kernel
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version, ARCnet card model, CPU type, number of systems on your network, and
|
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list of software in use to me at the following address:
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apenwarr@worldvisions.ca
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I do send (sometimes automated) replies to all messages I receive. My email
|
|
can be weird (and also usually gets forwarded all over the place along the
|
|
way to me), so if you don't get a reply within a reasonable time, please
|
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resend.
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It doesn't work: what now?
|
|
--------------------------
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Do the same as above, but also include the output of the ifconfig and route
|
|
commands, as well as any pertinent log entries (ie. anything that starts
|
|
with "arcnet:" and has shown up since the last reboot) in your mail.
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|
If you want to try fixing it yourself (I strongly recommend that you mail me
|
|
about the problem first, since it might already have been solved) you may
|
|
want to try some of the debug levels available. For heavy testing on
|
|
D_DURING or more, it would be a REALLY good idea to kill your klogd daemon
|
|
first! D_DURING displays 4-5 lines for each packet sent or received. D_TX,
|
|
D_RX, and D_SKB actually DISPLAY each packet as it is sent or received,
|
|
which is obviously quite big.
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|
Starting with v2.40 ALPHA, the autoprobe routines have changed
|
|
significantly. In particular, they won't tell you why the card was not
|
|
found unless you turn on the D_INIT_REASONS debugging flag.
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|
|
Once the driver is running, you can run the arcdump shell script (available
|
|
from me or in the full ARCnet package, if you have it) as root to list the
|
|
contents of the arcnet buffers at any time. To make any sense at all out of
|
|
this, you should grab the pertinent RFCs. (some are listed near the top of
|
|
arcnet.c). arcdump assumes your card is at 0xD0000. If it isn't, edit the
|
|
script.
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|
Buffers 0 and 1 are used for receiving, and Buffers 2 and 3 are for sending.
|
|
Ping-pong buffers are implemented both ways.
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|
|
If your debug level includes D_DURING and you did NOT define SLOW_XMIT_COPY,
|
|
the buffers are cleared to a constant value of 0x42 every time the card is
|
|
reset (which should only happen when you do an ifconfig up, or when Linux
|
|
decides that the driver is broken). During a transmit, unused parts of the
|
|
buffer will be cleared to 0x42 as well. This is to make it easier to figure
|
|
out which bytes are being used by a packet.
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|
|
You can change the debug level without recompiling the kernel by typing:
|
|
ifconfig arc0 down metric 1xxx
|
|
/etc/rc.d/rc.inet1
|
|
where "xxx" is the debug level you want. For example, "metric 1015" would put
|
|
you at debug level 15. Debug level 7 is currently the default.
|
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|
|
Note that the debug level is (starting with v1.90 ALPHA) a binary
|
|
combination of different debug flags; so debug level 7 is really 1+2+4 or
|
|
D_NORMAL+D_EXTRA+D_INIT. To include D_DURING, you would add 16 to this,
|
|
resulting in debug level 23.
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If you don't understand that, you probably don't want to know anyway.
|
|
E-mail me about your problem.
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|
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|
|
I want to send money: what now?
|
|
-------------------------------
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Go take a nap or something. You'll feel better in the morning.
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