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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/networking/arcnet.txt
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1----------------------------------------------------------------------------
2NOTE: See also arcnet-hardware.txt in this directory for jumper-setting
3and cabling information if you're like many of us and didn't happen to get a
4manual with your ARCnet card.
5----------------------------------------------------------------------------
6
7Since no one seems to listen to me otherwise, perhaps a poem will get your
8attention:
9 This driver's getting fat and beefy,
10 But my cat is still named Fifi.
11
12Hmm, I think I'm allowed to call that a poem, even though it's only two
13lines. Hey, I'm in Computer Science, not English. Give me a break.
14
15The point is: I REALLY REALLY REALLY REALLY REALLY want to hear from you if
16you test this and get it working. Or if you don't. Or anything.
17
18ARCnet 0.32 ALPHA first made it into the Linux kernel 1.1.80 - this was
19nice, but after that even FEWER people started writing to me because they
20didn't even have to install the patch. <sigh>
21
22Come on, be a sport! Send me a success report!
23
24(hey, that was even better than my original poem... this is getting bad!)
25
26
27--------
28WARNING:
29--------
30
31If you don't e-mail me about your success/failure soon, I may be forced to
32start SINGING. And we don't want that, do we?
33
34(You know, it might be argued that I'm pushing this point a little too much.
35If you think so, why not flame me in a quick little e-mail? Please also
36include the type of card(s) you're using, software, size of network, and
37whether it's working or not.)
38
39My e-mail address is: apenwarr@worldvisions.ca
40
41
42---------------------------------------------------------------------------
43
44
45These are the ARCnet drivers for Linux.
46
47
48This new release (2.91) has been put together by David Woodhouse
49<dwmw2@cam.ac.uk>, in an attempt to tidy up the driver after adding support
50for yet another chipset. Now the generic support has been separated from the
51individual chipset drivers, and the source files aren't quite so packed with
52#ifdefs! I've changed this file a bit, but kept it in the first person from
53Avery, because I didn't want to completely rewrite it.
54
55The previous release resulted from many months of on-and-off effort from me
56(Avery Pennarun), many bug reports/fixes and suggestions from others, and in
57particular a lot of input and coding from Tomasz Motylewski. Starting with
58ARCnet 2.10 ALPHA, Tomasz's all-new-and-improved RFC1051 support has been
59included and seems to be working fine!
60
61
62Where do I discuss these drivers?
63---------------------------------
64
65Tomasz has been so kind as to set up a new and improved mailing list.
66Subscribe by sending a message with the BODY "subscribe linux-arcnet YOUR
67REAL NAME" to listserv@tichy.ch.uj.edu.pl. Then, to submit messages to the
68list, mail to linux-arcnet@tichy.ch.uj.edu.pl.
69
70There are archives of the mailing list at:
71 http://tichy.ch.uj.edu.pl/lists/linux-arcnet
72
73The people on linux-net@vger.kernel.org have also been known to be very
74helpful, especially when we're talking about ALPHA Linux kernels that may or
75may not work right in the first place.
76
77
78Other Drivers and Info
79----------------------
80
81You can try my ARCNET page on the World Wide Web at:
82 http://www.worldvisions.ca/~apenwarr/arcnet/
83
84Also, SMC (one of the companies that makes ARCnet cards) has a WWW site you
85might be interested in, which includes several drivers for various cards
86including ARCnet. Try:
87 http://www.smc.com/
88
89Performance Technologies makes various network software that supports
90ARCnet:
91 http://www.perftech.com/ or ftp to ftp.perftech.com.
92
93Novell makes a networking stack for DOS which includes ARCnet drivers. Try
94FTPing to ftp.novell.com.
95
96You can get the Crynwr packet driver collection (including arcether.com, the
97one you'll want to use with ARCnet cards) from
98oak.oakland.edu:/simtel/msdos/pktdrvr. It won't work perfectly on a 386+
99without patches, though, and also doesn't like several cards. Fixed
100versions are available on my WWW page, or via e-mail if you don't have WWW
101access.
102
103
104Installing the Driver
105---------------------
106
107All you will need to do in order to install the driver is:
108 make config
109 (be sure to choose ARCnet in the network devices
110 and at least one chipset driver.)
111 make clean
112 make zImage
113
114If you obtained this ARCnet package as an upgrade to the ARCnet driver in
115your current kernel, you will need to first copy arcnet.c over the one in
116the linux/drivers/net directory.
117
118You will know the driver is installed properly if you get some ARCnet
119messages when you reboot into the new Linux kernel.
120
121There are four chipset options:
122
123 1. Standard ARCnet COM90xx chipset.
124
125This is the normal ARCnet card, which you've probably got. This is the only
126chipset driver which will autoprobe if not told where the card is.
127It following options on the command line:
128 com90xx=[<io>[,<irq>[,<shmem>]]][,<name>] | <name>
129
130If you load the chipset support as a module, the options are:
131 io=<io> irq=<irq> shmem=<shmem> device=<name>
132
133To disable the autoprobe, just specify "com90xx=" on the kernel command line.
134To specify the name alone, but allow autoprobe, just put "com90xx=<name>"
135
136 2. ARCnet COM20020 chipset.
137
138This is the new chipset from SMC with support for promiscuous mode (packet
139sniffing), extra diagnostic information, etc. Unfortunately, there is no
140sensible method of autoprobing for these cards. You must specify the I/O
141address on the kernel command line.
142The command line options are:
143 com20020=<io>[,<irq>[,<node_ID>[,backplane[,CKP[,timeout]]]]][,name]
144
145If you load the chipset support as a module, the options are:
146 io=<io> irq=<irq> node=<node_ID> backplane=<backplane> clock=<CKP>
147 timeout=<timeout> device=<name>
148
149The COM20020 chipset allows you to set the node ID in software, overriding the
150default which is still set in DIP switches on the card. If you don't have the
151COM20020 data sheets, and you don't know what the other three options refer
152to, then they won't interest you - forget them.
153
154 3. ARCnet COM90xx chipset in IO-mapped mode.
155
156This will also work with the normal ARCnet cards, but doesn't use the shared
157memory. It performs less well than the above driver, but is provided in case
158you have a card which doesn't support shared memory, or (strangely) in case
159you have so many ARCnet cards in your machine that you run out of shmem slots.
160If you don't give the IO address on the kernel command line, then the driver
161will not find the card.
162The command line options are:
163 com90io=<io>[,<irq>][,<name>]
164
165If you load the chipset support as a module, the options are:
166 io=<io> irq=<irq> device=<name>
167
168 4. ARCnet RIM I cards.
169
170These are COM90xx chips which are _completely_ memory mapped. The support for
171these is not tested. If you have one, please mail the author with a success
172report. All options must be specified, except the device name.
173Command line options:
174 arcrimi=<shmem>,<irq>,<node_ID>[,<name>]
175
176If you load the chipset support as a module, the options are:
177 shmem=<shmem> irq=<irq> node=<node_ID> device=<name>
178
179
180Loadable Module Support
181-----------------------
182
183Configure and rebuild Linux. When asked, answer 'm' to "Generic ARCnet
184support" and to support for your ARCnet chipset if you want to use the
185loadable module. You can also say 'y' to "Generic ARCnet support" and 'm'
186to the chipset support if you wish.
187
188 make config
189 make clean
190 make zImage
191 make modules
192
193If you're using a loadable module, you need to use insmod to load it, and
194you can specify various characteristics of your card on the command
195line. (In recent versions of the driver, autoprobing is much more reliable
196and works as a module, so most of this is now unnecessary.)
197
198For example:
199 cd /usr/src/linux/modules
200 insmod arcnet.o
201 insmod com90xx.o
202 insmod com20020.o io=0x2e0 device=eth1
203
204
205Using the Driver
206----------------
207
208If you build your kernel with ARCnet COM90xx support included, it should
209probe for your card automatically when you boot. If you use a different
210chipset driver complied into the kernel, you must give the necessary options
211on the kernel command line, as detailed above.
212
213Go read the NET-2-HOWTO and ETHERNET-HOWTO for Linux; they should be
214available where you picked up this driver. Think of your ARCnet as a
215souped-up (or down, as the case may be) Ethernet card.
216
217By the way, be sure to change all references from "eth0" to "arc0" in the
218HOWTOs. Remember that ARCnet isn't a "true" Ethernet, and the device name
219is DIFFERENT.
220
221
222Multiple Cards in One Computer
223------------------------------
224
225Linux has pretty good support for this now, but since I've been busy, the
226ARCnet driver has somewhat suffered in this respect. COM90xx support, if
227compiled into the kernel, will (try to) autodetect all the installed cards.
228
229If you have other cards, with support compiled into the kernel, then you can
230just repeat the options on the kernel command line, e.g.:
231LILO: linux com20020=0x2e0 com20020=0x380 com90io=0x260
232
233If you have the chipset support built as a loadable module, then you need to
234do something like this:
235 insmod -o arc0 com90xx
236 insmod -o arc1 com20020 io=0x2e0
237 insmod -o arc2 com90xx
238The ARCnet drivers will now sort out their names automatically.
239
240
241How do I get it to work with...?
242--------------------------------
243
244NFS: Should be fine linux->linux, just pretend you're using Ethernet cards.
245 oak.oakland.edu:/simtel/msdos/nfs has some nice DOS clients. There
246 is also a DOS-based NFS server called SOSS. It doesn't multitask
247 quite the way Linux does (actually, it doesn't multitask AT ALL) but
248 you never know what you might need.
249
250 With AmiTCP (and possibly others), you may need to set the following
251 options in your Amiga nfstab: MD 1024 MR 1024 MW 1024
252 (Thanks to Christian Gottschling <ferksy@indigo.tng.oche.de>
253 for this.)
254
255 Probably these refer to maximum NFS data/read/write block sizes. I
256 don't know why the defaults on the Amiga didn't work; write to me if
257 you know more.
258
259DOS: If you're using the freeware arcether.com, you might want to install
260 the driver patch from my web page. It helps with PC/TCP, and also
261 can get arcether to load if it timed out too quickly during
262 initialization. In fact, if you use it on a 386+ you REALLY need
263 the patch, really.
264
265Windows: See DOS :) Trumpet Winsock works fine with either the Novell or
266 Arcether client, assuming you remember to load winpkt of course.
267
268LAN Manager and Windows for Workgroups: These programs use protocols that
269 are incompatible with the Internet standard. They try to pretend
270 the cards are Ethernet, and confuse everyone else on the network.
271
272 However, v2.00 and higher of the Linux ARCnet driver supports this
273 protocol via the 'arc0e' device. See the section on "Multiprotocol
274 Support" for more information.
275
276 Using the freeware Samba server and clients for Linux, you can now
277 interface quite nicely with TCP/IP-based WfWg or Lan Manager
278 networks.
279
280Windows 95: Tools are included with Win95 that let you use either the LANMAN
281 style network drivers (NDIS) or Novell drivers (ODI) to handle your
282 ARCnet packets. If you use ODI, you'll need to use the 'arc0'
283 device with Linux. If you use NDIS, then try the 'arc0e' device.
284 See the "Multiprotocol Support" section below if you need arc0e,
285 you're completely insane, and/or you need to build some kind of
286 hybrid network that uses both encapsulation types.
287
288OS/2: I've been told it works under Warp Connect with an ARCnet driver from
289 SMC. You need to use the 'arc0e' interface for this. If you get
290 the SMC driver to work with the TCP/IP stuff included in the
291 "normal" Warp Bonus Pack, let me know.
292
293 ftp.microsoft.com also has a freeware "Lan Manager for OS/2" client
294 which should use the same protocol as WfWg does. I had no luck
295 installing it under Warp, however. Please mail me with any results.
296
297NetBSD/AmiTCP: These use an old version of the Internet standard ARCnet
298 protocol (RFC1051) which is compatible with the Linux driver v2.10
299 ALPHA and above using the arc0s device. (See "Multiprotocol ARCnet"
300 below.) ** Newer versions of NetBSD apparently support RFC1201.
301
302
303Using Multiprotocol ARCnet
304--------------------------
305
306The ARCnet driver v2.10 ALPHA supports three protocols, each on its own
307"virtual network device":
308
309 arc0 - RFC1201 protocol, the official Internet standard which just
310 happens to be 100% compatible with Novell's TRXNET driver.
311 Version 1.00 of the ARCnet driver supported _only_ this
312 protocol. arc0 is the fastest of the three protocols (for
313 whatever reason), and allows larger packets to be used
314 because it supports RFC1201 "packet splitting" operations.
315 Unless you have a specific need to use a different protocol,
316 I strongly suggest that you stick with this one.
317
318 arc0e - "Ethernet-Encapsulation" which sends packets over ARCnet
319 that are actually a lot like Ethernet packets, including the
320 6-byte hardware addresses. This protocol is compatible with
321 Microsoft's NDIS ARCnet driver, like the one in WfWg and
322 LANMAN. Because the MTU of 493 is actually smaller than the
323 one "required" by TCP/IP (576), there is a chance that some
324 network operations will not function properly. The Linux
325 TCP/IP layer can compensate in most cases, however, by
326 automatically fragmenting the TCP/IP packets to make them
327 fit. arc0e also works slightly more slowly than arc0, for
328 reasons yet to be determined. (Probably it's the smaller
329 MTU that does it.)
330
331 arc0s - The "[s]imple" RFC1051 protocol is the "previous" Internet
332 standard that is completely incompatible with the new
333 standard. Some software today, however, continues to
334 support the old standard (and only the old standard)
335 including NetBSD and AmiTCP. RFC1051 also does not support
336 RFC1201's packet splitting, and the MTU of 507 is still
337 smaller than the Internet "requirement," so it's quite
338 possible that you may run into problems. It's also slower
339 than RFC1201 by about 25%, for the same reason as arc0e.
340
341 The arc0s support was contributed by Tomasz Motylewski
342 and modified somewhat by me. Bugs are probably my fault.
343
344You can choose not to compile arc0e and arc0s into the driver if you want -
345this will save you a bit of memory and avoid confusion when eg. trying to
346use the "NFS-root" stuff in recent Linux kernels.
347
348The arc0e and arc0s devices are created automatically when you first
349ifconfig the arc0 device. To actually use them, though, you need to also
350ifconfig the other virtual devices you need. There are a number of ways you
351can set up your network then:
352
353
3541. Single Protocol.
355
356 This is the simplest way to configure your network: use just one of the
357 two available protocols. As mentioned above, it's a good idea to use
358 only arc0 unless you have a good reason (like some other software, ie.
359 WfWg, that only works with arc0e).
360
361 If you need only arc0, then the following commands should get you going:
362 ifconfig arc0 MY.IP.ADD.RESS
363 route add MY.IP.ADD.RESS arc0
364 route add -net SUB.NET.ADD.RESS arc0
365 [add other local routes here]
366
367 If you need arc0e (and only arc0e), it's a little different:
368 ifconfig arc0 MY.IP.ADD.RESS
369 ifconfig arc0e MY.IP.ADD.RESS
370 route add MY.IP.ADD.RESS arc0e
371 route add -net SUB.NET.ADD.RESS arc0e
372
373 arc0s works much the same way as arc0e.
374
375
3762. More than one protocol on the same wire.
377
378 Now things start getting confusing. To even try it, you may need to be
379 partly crazy. Here's what *I* did. :) Note that I don't include arc0s in
380 my home network; I don't have any NetBSD or AmiTCP computers, so I only
381 use arc0s during limited testing.
382
383 I have three computers on my home network; two Linux boxes (which prefer
384 RFC1201 protocol, for reasons listed above), and one XT that can't run
385 Linux but runs the free Microsoft LANMAN Client instead.
386
387 Worse, one of the Linux computers (freedom) also has a modem and acts as
388 a router to my Internet provider. The other Linux box (insight) also has
389 its own IP address and needs to use freedom as its default gateway. The
390 XT (patience), however, does not have its own Internet IP address and so
391 I assigned it one on a "private subnet" (as defined by RFC1597).
392
393 To start with, take a simple network with just insight and freedom.
394 Insight needs to:
395 - talk to freedom via RFC1201 (arc0) protocol, because I like it
396 more and it's faster.
397 - use freedom as its Internet gateway.
398
399 That's pretty easy to do. Set up insight like this:
400 ifconfig arc0 insight
401 route add insight arc0
402 route add freedom arc0 /* I would use the subnet here (like I said
403 to to in "single protocol" above),
404 but the rest of the subnet
405 unfortunately lies across the PPP
406 link on freedom, which confuses
407 things. */
408 route add default gw freedom
409
410 And freedom gets configured like so:
411 ifconfig arc0 freedom
412 route add freedom arc0
413 route add insight arc0
414 /* and default gateway is configured by pppd */
415
416 Great, now insight talks to freedom directly on arc0, and sends packets
417 to the Internet through freedom. If you didn't know how to do the above,
418 you should probably stop reading this section now because it only gets
419 worse.
420
421 Now, how do I add patience into the network? It will be using LANMAN
422 Client, which means I need the arc0e device. It needs to be able to talk
423 to both insight and freedom, and also use freedom as a gateway to the
424 Internet. (Recall that patience has a "private IP address" which won't
425 work on the Internet; that's okay, I configured Linux IP masquerading on
426 freedom for this subnet).
427
428 So patience (necessarily; I don't have another IP number from my
429 provider) has an IP address on a different subnet than freedom and
430 insight, but needs to use freedom as an Internet gateway. Worse, most
431 DOS networking programs, including LANMAN, have braindead networking
432 schemes that rely completely on the netmask and a 'default gateway' to
433 determine how to route packets. This means that to get to freedom or
434 insight, patience WILL send through its default gateway, regardless of
435 the fact that both freedom and insight (courtesy of the arc0e device)
436 could understand a direct transmission.
437
438 I compensate by giving freedom an extra IP address - aliased 'gatekeeper'
439 - that is on my private subnet, the same subnet that patience is on. I
440 then define gatekeeper to be the default gateway for patience.
441
442 To configure freedom (in addition to the commands above):
443 ifconfig arc0e gatekeeper
444 route add gatekeeper arc0e
445 route add patience arc0e
446
447 This way, freedom will send all packets for patience through arc0e,
448 giving its IP address as gatekeeper (on the private subnet). When it
449 talks to insight or the Internet, it will use its "freedom" Internet IP
450 address.
451
452 You will notice that we haven't configured the arc0e device on insight.
453 This would work, but is not really necessary, and would require me to
454 assign insight another special IP number from my private subnet. Since
455 both insight and patience are using freedom as their default gateway, the
456 two can already talk to each other.
457
458 It's quite fortunate that I set things up like this the first time (cough
459 cough) because it's really handy when I boot insight into DOS. There, it
460 runs the Novell ODI protocol stack, which only works with RFC1201 ARCnet.
461 In this mode it would be impossible for insight to communicate directly
462 with patience, since the Novell stack is incompatible with Microsoft's
463 Ethernet-Encap. Without changing any settings on freedom or patience, I
464 simply set freedom as the default gateway for insight (now in DOS,
465 remember) and all the forwarding happens "automagically" between the two
466 hosts that would normally not be able to communicate at all.
467
468 For those who like diagrams, I have created two "virtual subnets" on the
469 same physical ARCnet wire. You can picture it like this:
470
471
472 [RFC1201 NETWORK] [ETHER-ENCAP NETWORK]
473 (registered Internet subnet) (RFC1597 private subnet)
474
475 (IP Masquerade)
476 /---------------\ * /---------------\
477 | | * | |
478 | +-Freedom-*-Gatekeeper-+ |
479 | | | * | |
480 \-------+-------/ | * \-------+-------/
481 | | |
482 Insight | Patience
483 (Internet)
484
485
486
487It works: what now?
488-------------------
489
490Send mail describing your setup, preferably including driver version, kernel
491version, ARCnet card model, CPU type, number of systems on your network, and
492list of software in use to me at the following address:
493 apenwarr@worldvisions.ca
494
495I do send (sometimes automated) replies to all messages I receive. My email
496can be weird (and also usually gets forwarded all over the place along the
497way to me), so if you don't get a reply within a reasonable time, please
498resend.
499
500
501It doesn't work: what now?
502--------------------------
503
504Do the same as above, but also include the output of the ifconfig and route
505commands, as well as any pertinent log entries (ie. anything that starts
506with "arcnet:" and has shown up since the last reboot) in your mail.
507
508If you want to try fixing it yourself (I strongly recommend that you mail me
509about the problem first, since it might already have been solved) you may
510want to try some of the debug levels available. For heavy testing on
511D_DURING or more, it would be a REALLY good idea to kill your klogd daemon
512first! D_DURING displays 4-5 lines for each packet sent or received. D_TX,
513D_RX, and D_SKB actually DISPLAY each packet as it is sent or received,
514which is obviously quite big.
515
516Starting with v2.40 ALPHA, the autoprobe routines have changed
517significantly. In particular, they won't tell you why the card was not
518found unless you turn on the D_INIT_REASONS debugging flag.
519
520Once the driver is running, you can run the arcdump shell script (available
521from me or in the full ARCnet package, if you have it) as root to list the
522contents of the arcnet buffers at any time. To make any sense at all out of
523this, you should grab the pertinent RFCs. (some are listed near the top of
524arcnet.c). arcdump assumes your card is at 0xD0000. If it isn't, edit the
525script.
526
527Buffers 0 and 1 are used for receiving, and Buffers 2 and 3 are for sending.
528Ping-pong buffers are implemented both ways.
529
530If your debug level includes D_DURING and you did NOT define SLOW_XMIT_COPY,
531the buffers are cleared to a constant value of 0x42 every time the card is
532reset (which should only happen when you do an ifconfig up, or when Linux
533decides that the driver is broken). During a transmit, unused parts of the
534buffer will be cleared to 0x42 as well. This is to make it easier to figure
535out which bytes are being used by a packet.
536
537You can change the debug level without recompiling the kernel by typing:
538 ifconfig arc0 down metric 1xxx
539 /etc/rc.d/rc.inet1
540where "xxx" is the debug level you want. For example, "metric 1015" would put
541you at debug level 15. Debug level 7 is currently the default.
542
543Note that the debug level is (starting with v1.90 ALPHA) a binary
544combination of different debug flags; so debug level 7 is really 1+2+4 or
545D_NORMAL+D_EXTRA+D_INIT. To include D_DURING, you would add 16 to this,
546resulting in debug level 23.
547
548If you don't understand that, you probably don't want to know anyway.
549E-mail me about your problem.
550
551
552I want to send money: what now?
553-------------------------------
554
555Go take a nap or something. You'll feel better in the morning.