ifconfig
and route. See the Network Howto for that stuff.
ether= thing didn't do anything for me. Why?
The Ethernet-Howto covers what cards you should and shouldn't buy; how to set them up, how to run more than one, and other common problems and questions. It contains detailed information on the current level of support for all of the most common ethernet cards available.
It does not cover the software end of things, as that
is covered in the NET-3 Howto. Also note that general non-Linux
specific questions about Ethernet are not (or at least they should
not be) answered here. For those types of questions, see the
excellent amount of information in the comp.dcom.lans.ethernet
FAQ. You can FTP it from rtfm.mit.edu just like all the other
newsgroup FAQs.
This present revision covers distribution kernels up to and including 2.2.7.
The Ethernet-Howto is by:
Paul Gortmaker, p_gortmaker@yahoo.com
The primary source of information for the initial ASCII-only version of the Ethernet-Howto was:
Donald J. Becker, becker@cesdis.gsfc.nasa.gov
who we should thank for writing the vast majority of ethernet card drivers that are presently available for Linux. He also is the author of the original NFS server too. Thanks Donald!
This document is Copyright (c) 1993-1999 by Paul Gortmaker. Please see the Disclaimer and Copying information at the end of this document ( copyright) for information about redistribution of this document and the usual `we are not responsible for what you manage to break...' type legal stuff.
New versions of this document can be retrieved from:
or for those wishing to use FTP and/or get non-HTML formats:
This is the `official' location - it can also be found on various Linux WWW/ftp mirror sites. Updates will be made as new information and/or drivers becomes available. If this copy that you are reading is more than 6 months old, then you should check to see if an updated copy is available.
This document is available in various formats (postscript, dvi, ASCII, HTML, etc.). I would recommend viewing it in HTML (via a WWW browser) or the Postscript/dvi format. Both of these contain cross-references that are not included in the plain text ASCII format.
As this guide is getting bigger and bigger, you probably don't want to spend the rest of your afternoon reading the whole thing. And the good news is that you don't have to read it all. The HTML and Postscript/dvi versions have a table of contents which will really help you find what you need a lot faster.
Chances are you are reading this document beacuse you can't get things to work and you don't know what to do or check. The next section ( HELP - It doesn't work!) is aimed at newcomers to linux and will point you in the right direction.
Typically the same problems and questions are asked over and over again by different people. Chances are your specific problem or question is one of these Frequently Asked Questions, and is answered in the FAQ portion of this document . ( The FAQ section). Everybody should have a look through this section before posting for help.
If you haven't got an ethernet card, then you will want to start with deciding on a card. ( What card should I buy...)
If you have already got an ethernet card, but are not sure if you can use it with Linux, then you will want to read the section which contains specific information on each manufacturer, and their cards. ( Vendor Specific...)
If you are interested in some of the technical aspects of the Linux device drivers, then you can have a browse of the section with this type of information. ( Technical Information)
Okay, don't panic. This will lead you through the process of getting things working, even if you have no prior background in linux or ethernet hardware.
First thing you need to do is figure out what model your card is so you can determine if Linux has a driver for that particular card. Different cards typically have different ways of being controlled by the host computer, and the linux driver (if there is one) contains this control information in a format that allows linux to use the card. If you don't have any manuals or anything of the sort that tell you anything about the card model, then you can try the section on helping with mystery cards (reference section: Identifying an Unknown Card).
Now that you know what type of card you have, read through the details of your particular card in the card specific section (reference section: Vendor Specific...) which lists in alphabetical order, card manufacturers, individual model numbers and whether it has a linux driver or not. If it lists it as `Not Supported' you can pretty much give up here. If you can't find your card in that list, then check to see if your card manual lists it as being `compatible' with another known card type. For example there are hundreds, if not thousands of different cards made to be compatible with the original Novell NE2000 design.
Assuming you have found out that a linux driver exists for your card, you now have to find it and make use of it. Just because linux has a driver for your card does not mean that it is built into every kernel. (The kernel is the core operating system that is first loaded at boot, and contains drivers for various pieces of hardware, among other things.) Depending on who made the particular linux distribution you are using, there may be only a few pre-built kernels, and a whole bunch of drivers as smaller separate modules, or there may be a whole lot of kernels, covering a vast combination of built-in driver combinations.
Most linux distributions now ship with a bunch of small modules that are the various drivers. The required modules are typically loaded late in the boot process, or on-demand as a driver is needed to access a particualr device. You will need to attach this module to the kernel after it has booted up. See the information that came with your distribution on installing and using modules, along with the module section in this document. ( Using the Ethernet Drivers as Modules)
If you didn't find either a pre-built kernel with your driver, or a module form of the driver, chances are you have a typically uncommon card, and you will have to build your own kernel with that driver included. Once you have linux installed, building a custom kernel is not difficult at all. You essentially answer yes or no to what you want the kernel to contain, and then tell it to build it. There is a Kernel-HowTo that will help you along.
At this point you should have somehow managed to be booting a kernel with your driver built in, or be loading it as a module. About half of the problems people have are related to not having driver loaded one way or another, so you may find things work now.
If it still doesn't work, then you need to verify that the
kernel is indeed detecting the card. To do this, you need
to type dmesg | more when logged in after the
system has booted and all modules have been loaded.
This will allow you to review the boot messages that the
kernel scrolled up the screen during the boot process.
If the card has been detected, you should see somewhere in
that list a message from your card's driver that starts with
eth0, mentions the driver name and the hardware parameters
(interrupt setting, input/output port address, etc) that
the card is set for. (Note: At boot, linux lists
all the PCI cards installed in the system, regardless of
what drivers are available - do not mistake this for the
driver detection which comes later!)
If you don't see a driver indentification message like this, then the driver didn't detect your card, and that is why things aren't working. See the FAQ ( The FAQ Section) for what to do if your card is not detected. If you have a NE2000 compatible, there is also some NE2000 specific tips on getting a card detected in the FAQ section as well.
If the card is detected, but the detection message reports some sort of error, like a resource conflict, then the driver probably won't have initialized properly and the card still wont be useable. Most common error messages of this sort are also listed in the FAQ section, along with a solution.
If the detection message seems okay, then double check the card resources reported by the driver against those that the card is physically set for (either by little black jumpers on the card, or by a software utility supplied by the card manufacturer.) These must match exactly. For example, if you have the card jumpered or configured to IRQ 15 and the driver reports IRQ 10 in the boot messages, things will not work. The FAQ section discusses the most common cases of drivers incorrectly detecting the configuration information of various cards.
At this point, you have managed to get you card detected with
all the correct parameters, and hopefully everything is working.
If not, then you either have a software configuration error,
or a hardware configuration error. A software configuration
error is not setting up the right network addresses for the
ifconfig and route commands, and details of how
to do that are fully described in the Network HowTo and the
`Network Administrator's Guide' which both probably came on
the CD-ROM you installed from.
A hardware configuration error is when some sort of resource
conflict or mis-configuration (that the driver didn't detect
at boot) stops the card from working properly. This typically
can be observed in several different ways. (1) You get
an error message when ifconfig tries to open the device
for use, such as ``SIOCSFFLAGS: Try again''. (2) The driver
reports eth0 error messages (viewed by dmesg | more)
or strange inconsistencies for each time it tries to send or
receive data. (3) Typing cat /proc/net/dev shows
non-zero numbers in one of the errs, drop, fifo, frame or
carrier columns for eth0. (4) Typing
cat /proc/interrupts shows a zero interrupt count
for the card.
Most of the typical hardware configuration errors are also
discussed in the FAQ section.
Well, if you have got to this point and things still
aren't working, read the FAQ section
of this document, read the vendor specific section detailing
your particular card, and if it still doesn't work then
you may have to resort to posting to an appropriate
newsgroup for help. If you do post, please detail all
relevant information in that post, such as the card brand,
the kernel version, the driver boot messages, the output
from cat /proc/net/dev, a clear description of
the problem, and of course what you
have already tried to do in an effort to get things to work.
You would be surprised at how many people post useless things like ``Can someone help me? My ethernet doesn't work.'' and nothing else. Readers of the newsgroups tend to ignore such silly posts, whereas a detailed and informational problem description may allow a `linux-guru' to spot your problem right away.
The answer to this question depends heavily on exactly what you intend on doing with your net connection, and how much traffic it will see.
If you only expect a single user to be doing the occasional ftp session or WWW connection, then even an old 8 bit ISA card will probably keep you happy.
If you intend to set up a server, and you require the CPU overhead of Rx'ing and Tx'ing network data to be kept to a minimum, you probably want to look at one of the PCI cards that uses a chip with bus-mastering capapbility, such as the DEC tulip (21xxx) chip, or the AMD PCnet-PCI chip.
If you fall somewhere in the middle of the above, then any one of the low cost PCI or 16 bit ISA cards with stable drivers will do the job for you.
Of the 16 bit ISA cards, the following drivers are very mature, and you shouldn't have any problems if you buy a card that uses these drivers.
SMC-Ultra/EtherEZ, SMC-Elite (WD80x3), 3c509, Lance, NE2000.
This is not to say that all the other drivers are unstable. It just happens that the above are the oldest and most used of all the linux drivers, making them the safest choice.
Note that some el-cheapo motherboards can have trouble with the bus-mastering that the ISA Lance cards do, and some el-cheapo NE2000 clones can have trouble getting detected at boot.
The most commonly used linux PCI drivers are probably the 3Com Vortex/Boomerang (3c59x/3c9xx), the DEC tulip (21xxx), and the Intel EtherExpressPro 100. The various PCI-NE2000 clone cards are also extremely common, but purchasing a PCI-NE2000 clone card is not recommended unless the lowest possible price is more important than having a modern high-performace design card.
You probably can't buy a new 8 bit ISA ethercard anymore, but you will find lots of them turning up at computer swap meets and the like for the next few years, at very low prices. This will make them popular for ``home-ethernet'' systems. The above holds true for 16 bit ISA cards now as well, since PCI cards are now very common.
Some 8 bit cards that will provide adequate performance for light to average use are the wd8003, the 3c503 and the ne1000. The 3c501 provides poor performance, and these poor 12 year old relics of the XT days should be avoided. (Send them to Alan, he collects them...)
The 8 bit data path doesn't hurt performance that much, as you can still expect to get about 500 to 800kB/s ftp download speed to an 8 bit wd8003 card (on a fast ISA bus) from a fast host. And if most of your net-traffic is going to remote sites, then the bottleneck in the path will be elsewhere, and the only speed difference you will notice is during net activity on your local subnet.
Note that a 10Mbs network typically doesn't justify requiring a 32 bit interface. See Programmed I/O vs. ... as to why having a 10Mbps ethercard on an 8MHz ISA bus is really not a bottleneck. Even though having the ethercard on a fast bus won't necessarily mean faster transfers, it will usually mean reduced CPU overhead, which is good for multi-user systems.
Of course for 100Mbps networks, which are now commonplace, the 32 bit interface is a must to make use of the full bandwidth. AMD has the 32 bit PCnet-VLB and PCnet-PCI chips. See AMD PCnet-32 for info on the 32 bit versions of the LANCE / PCnet-ISA chip.
The DEC 21xxx PCI `tulip' chip is another option (see DEC 21040) for power-users. Many manufacturers produce cards that use this chip, and the prices of such no-name cards is usually quite cheap.
3Com's `Vortex' and `Boomerang' PCI cards are also another option, and the price is quite cheap if you can get one under their evaluation deal while it lasts. (see 3c590/3c595)
Intel's EtherExpress Pro 10/100 PCI cards have also been reported to work well with linux. (see EtherExpress)
Various clone manufacturers have started making PCI NE2000
clones based on a RealTek or Winbond chip. These cards are
also supported by the linux ne2000 driver for v2.0.31
and newer kernels.
However you only benefit from the faster bus interface, as
the card is still using the age-old ne2000 driver interface.
As of v2.0.34 (and above) a separate PCI-specific driver for
these cards ne2k-pci.c is also available, which will
be sightly more efficient than the ISA ne.c driver.
The present list of supported 100Mbs hardware is as follows: cards with the DEC 21140 chip; the 3c595/3c90x Vortex cards; the EtherExpressPro10/100B; the PCnet-FAST; the SMC 83c170 (epic100) and the HP 100VG ANY-LAN.
Have a look at the vendor specific information for each that is in this document. You may also want to check out some of the following:
Dan Kegel's Fast Ethernet Page
100BaseT is much more prominent than 100VG, and the
following blurb from an older one of Donald's informative
comp.os.linux postings summarizes the situation quite well:
``For those not in the know, there are two competing 100Mbs ethernet standards, 100VG (aka 100baseVG and 100VG-AnyLAN) and 100baseT (with 100baseTx, 100baseT4 and 100baseFx cable types).
100VG was on the market first, and I feel that it is better engineered than 100baseTx. I was rooting for it to win, but it clearly isn't going to. HP et al. made several bad choices:
1) Delaying the standard so that they could accommodate IBM and support token ring frames. It `seemed like a good idea at the time', since it would enable token ring shops to upgrade without the managers having to admit they made a very expensive mistake committing to the wrong technology. But there was nothing to be gained, as the two frame types couldn't coexist on a network, token ring is a morass of complexity, and IBM went with 100baseT anyway.
2) Producing only ISA and EISA cards. (A PCI model was only recently announced.) The ISA bus is too slow for 100mbs, and relatively few EISA machines exist. At the time VLB was common, fast, and cheap with PCI a viable choice. But "old-timer" wisdom held that servers would stay with the more expensive EISA bus.
3) Not sending me a databook. Yes, this action was the real reason for the 100VGs downfall :-). I called all over for programming info, and all I could get was a few page color glossy brochure from AT&T describing how wonderful the Regatta chipset was.''
If you are setting up a small ``personal'' network, you will probably want to use thinnet or thin ethernet cable. This is the style with the standard BNC connectors. The thinnet, or thin ethernet cabling, (RG-58 coaxial cable) with the BNC (metal push and turn-to-lock) connectors is technically called 10Base2.
Most ethercards also come in a `Combo' version for only $10-$20 more. These have both twisted pair and thinnet transceiver built-in, allowing you to change your mind later.
The twisted pair cables, with the RJ-45 (giant phone jack) connectors is technically called 10BaseT. You may also hear it called UTP (Unsheilded Twisted Pair).
The older thick ethernet (10mm coaxial cable) which is only found in older installations is called 10Base5. The 15 pin D-shaped plug found on some ethernet cards (the AUI connector) is used to connect to thick ethernet and external transcievers.
Large corporate installations will most likely use 10BaseT instead of 10Base2. 10Base2 does not offer any upgrade path to 100Base-whatever.
See Cables, Coax... for other concerns with different types of ethernet cable.
Here are some of the more frequently asked questions about using Linux with an Ethernet connection. Some of the more specific questions are sorted on a `per manufacturer basis'. Chances are the question you want an answer for has already been asked (and answered!) by someone else, so even if you don't find your answer here, you probably can find what you want from a news archive such as Dejanews.
I heard that there is an updated or preliminary/alpha driver available for my card. Where can I get it?
The newest of the `new' drivers can be found on Donald's
ftp site: cesdis.gsfc.nasa.gov in the
/pub/linux/ area. Things
change here quite frequently, so just look around for it.
Alternatively, it may be easier to use a WWW browser on:
to locate the driver that you are looking for. (Watch out for WWW browsers that silently munge the source by replacing TABs with spaces and so on - use ftp, or at least an FTP URL for downloading if unsure.)
Now, if it really is an alpha, or pre-alpha driver, then please treat it as such. In other words, don't complain because you can't figure out what to do with it. If you can't figure out how to install it, then you probably shouldn't be testing it. Also, if it brings your machine down, don't complain. Instead, send us a well documented bug report, or even better, a patch!
Note that some of the `useable' experimental/alpha drivers have
been included in the standard kernel source tree. When running
make config one of the first things you will be asked
is whether to ``Prompt for development and/or incomplete
code/drivers''. You will have to answer `Y' here to get
asked about including any alpha/experiemntal drivers.
What needs to be done so that Linux can run two ethernet cards?
The answer to this question depends on whether the driver(s)
is/are being used as a loadable module or are compiled directly
into the kernel. Most linux distributions use modular drivers now.
This saves distributing lots of kernels, each with a different driver
set built in. Instead a single basic kernel is used and the
individual drivers that are need for a particular user's system are
loaded once the system has booted far enough to access
the driver module files (usually stored in /lib/modules/).
With the Driver as a Module:
In the case of
PCI drivers, the module will typically detect all of the
installed cards of that brand model automatically. However,
for ISA cards, probing for a card is not a safe operation, and
hence you typically need to supply the I/O base address of the
card so the module knows where to look. This information is
stored in the file /etc/conf.modules.
As an example, consider a user that has two ISA NE2000 cards,
one at 0x300 and one at 0x240 and what lines they
would have in their /etc/conf.modules file:
alias eth0 ne
alias eth1 ne
options ne io=0x240,0x300
What this does: This says that if the administrator (or the
kernel) does a modprobe eth0 or a modprobe eth1 then
the ne.o driver should be loaded for either eth0 or
eth1. Furthermore, when the ne.o module is loaded, it
should be loaded with the options io=0x240,0x300 so that the
driver knows where to look for the cards. Note that the 0x
is important - things like 300h as commonly used in the DOS
world won't work. Switching the order of the 0x240 and
the 0x300 will switch which physical card ends up as
eth0 and eth1.
Most of the ISA module drivers can take multiple comma separated
I/O values like this example to handle multiple cards. However,
some (older?) drivers, such as the 3c501.o module are currently
only able to handle
one card per module load. In this case you can load the module
twice to get both cards detected. The /etc/conf.modules
file in this case would look like:
alias eth0 3c501
alias eth1 3c501
options eth0 -o 3c501-0 io=0x280 irq=5
options eth1 -o 3c501-1 io=0x300 irq=7
In this example the -o option has been used to give each
instance of the module a unique name, since you can't have two
modules loaded with the same name. The irq= option has
also been used to to specify the hardware IRQ setting of the card.
(This method can also be used with modules that accept comma
separated I/O values, but it is less efficient since the module
ends up being loaded twice when it doesn't really need to be.)
As a final example, consider a user with one 3c503 card
at 0x350and one SMC Elite16 (wd8013) card at 0x280.
They would have:
alias eth0 wd
alias eth1 3c503
options wd io=0x280
options 3c503 io=0x350
For PCI cards, you typically only need the alias lines to
correlate the ethN interfaces with the appropriate driver
name, since the I/O base of a PCI card can be safely detected.
The available modules are typically stored in
/lib/modules/`uname -r`/net where the
uname -r command gives the kernel version (e.g. 2.0.34).
You can look in there to see which one matches your card.
Once you have the correct settings in your conf.modules
file, you can test things out with:
modprobe ethN
dmesg | tail
where `N' is the number of the ethernet interface you are testing.
With the Driver Compiled into the Kernel: If you have the driver compiled into the kernel, then the hooks for multiple ethercards are all there. However, note that at the moment only one ethercard is auto-probed for by default. This helps to avoid possible boot time hangs caused by probing sensitive cards.
(Note: As of late 2.1.x kernels, the boot probes have been sorted into safe and unsafe, so that all safe (e.g. PCI and EISA) probes will find all related cards automatically. Systems with more than one ethernet card with at least one of them being an ISA card will still need to do one of the following.)
There are two ways that you can enable auto-probing for
the second (and third, and...) card. The easiest
method is to pass boot-time arguments to the kernel,
which is usually done by LILO. Probing for the
second card can be achieved by using a boot-time argument
as simple as ether=0,0,eth1. In this
case eth0 and eth1 will be assigned in the order
that the cards are found at boot. Say if you want
the card at 0x300 to be eth0 and
the card at 0x280 to be eth1 then you could use
LILO: linux ether=5,0x300,eth0 ether=15,0x280,eth1
The ether= command accepts more than the IRQ + I/O
+ name shown above. Please have a look at
Passing Ethernet Arguments...
for the full syntax, card specific parameters, and LILO tips.
These boot time arguments can be made permanent so that you
don't have to re-enter them every time. See the LILO
configuration option `append' in the LILO manual.
The second way (not recommended) is to edit the file
Space.c and replace the 0xffe0 entry for the
I/O address with a zero. The 0xffe0 entry tells it
not to probe for that device -- replacing it with a zero
will enable autoprobing for that device.
Note that if you are intending to use Linux as a gateway between two networks, you will have to re-compile a kernel with IP forwarding enabled. Usually using an old AT/286 with something like the `kbridge' software is a better solution.
If you are viewing this while net-surfing, you may wish to look at a mini-howto Donald has on his WWW site. Check out Multiple Ethercards.
ether= thing didn't do anything for me. Why?
As described above, the ether= command only works
for drivers that are compiled into the kernel. Now most
distributions use the drivers in a modular form, and so
the ether= command is rarely used anymore. (Some older
documentation has yet to be updated to reflect this change.)
If you want to apply options for a modular ethernet driver
you must make changes to the /etc/conf.modules
file.
If you are using a compiled in driver, and have added
an ether= to your LILO configuration file, note
that it won't take effect until you re-run lilo
to process the updated configuration file.
Problem: PCI NE2000 clone card is not detected at boot with v2.0.x.
Reason:
The ne.c driver up to v2.0.30 only knows about the PCI
ID number of RealTek 8029 based clone cards. Since then,
several others have also released PCI NE2000 clone
cards, with different PCI ID numbers, and hence the
driver doesn't detect them.
Solution: The easiest solution is to upgrade to a v2.0.31 (or newer) version of the linux kernel. It knows the ID numbers of about five different NE2000-PCI chips, and will detect them automatically at boot or at module loading time. If you upgrade to 2.0.34 (or newer) there is a PCI-only specific NE2000 driver that is slightly smaller and more efficient than the original ISA/PCI driver.
Problem: PCI NE2000 clone card is reported as an ne1000 (8 bit card!) at boot or when I load the ne.o module for v2.0.x, and hence doesn't work.
Reason: Some PCI clones don't implement byte wide access (and hence are not truly 100% NE2000 compatible). This causes the probe to think they are NE1000 cards.
Solution: You need to upgrade to v2.0.31 (or newer) as described above. The driver(s) now check for this hardware bug.
Problem: PCI NE2000 card gets terrible performance, even when reducing the window size as described in the Performance Tips section.
Reason: The spec sheets for the original 8390 chip, desgined and sold over ten years ago, noted that a dummy read from the chip was required before each write operation for maximum reliablity. The driver has the facility to do this but it has been disabled by default since the v1.2 kernel days. One user has reported that re-enabling this `mis-feature' helped their performance with a cheap PCI NE2000 clone card.
Solution:
Since it has only been reported as a solution by one person, don't
get your hopes up. Re-enabling the read before write fix is done
by simply editing the driver file in linux/drivers/net/,
uncommenting the line containing NE_RW_BUGFIX and then
rebuilding the kernel or module as appropriate. Please send an
e-mail describing the performance difference and type of card/chip
you have if this helps you. (The same can be done for the
ne2k-pci.c driver as well).
Problem:
The ne2k-pci.c driver reports error messages like
timeout waiting for Tx RDC with a PCI NE2000 card and doesn't
work right.
Reason: Your card and/or the card to PCI bus link can't handle the long word I/O optimization used in this driver.
Solution:
Firstly, check the settings available in the BIOS/CMOS setup
to see if any related to PCI bus timing are too aggressive for
reliable operation. Otherwise using the ISA/PCI ne.c
driver (or removing the #define USE_LONGIO from
ne2k-pci.c) should let you use the card.
Probem: ISA Plug and Play NE2000 (such as RealTek 8019) is not detected.
Reason: The original NE2000 specification (and hence the linux NE2000 driver) does not have support for Plug and Play.
Solution:
Use the DOS configuration disk that came with the card to disable
PnP, and to set the card to a specified I/O address and IRQ. Add
a line to /etc/conf.modules like options ne io=0xNNN
where 0xNNN is the hex I/O address you set the card to. (This
assumes you are using a modular driver; if not then use an
ether=0,0xNNN,eth0 argument at boot). You may also have to
enter the BIOS/CMOS setup and mark the IRQ as Legacy-ISA instead of
PnP. Alternatively, if you
need to leave PnP enabled for compatibility with some other operating
system, then look into the isapnptools package. Try
man isapnp to see if it is already installed on your system.
If not, then have a look at the following URL:
Problem: NE*000 driver reports `not found (no reset ack)' during boot probe.
Reason: This is related to the above change. After the initial verification that an 8390 is at the probed I/O address, the reset is performed. When the card has completed the reset, it is supposed to acknowedge that the reset has completed. Your card doesn't, and so the driver assumes that no NE card is present.
Solution:
You can tell the driver that you have a bad card by using
an otherwise unused mem_end hexidecimal value of 0xbad at
boot time. You have to also supply a non-zero I/O base
for the card when using the 0xbad override. For example,
a card that is at 0x340 that doesn't ack the reset
would use something like:
LILO: linux ether=0,0x340,0,0xbad,eth0
This will allow the card detection to continue, even if your
card doesn't ACK the reset. If you are using the driver as
a module, then you can supply the option bad=0xbad just
like you supply the I/O address.
Problem: NE*000 card hangs machine at first network access.
Reason: This problem has been reported for kernels as old as 1.1.57 to the present. It appears confined to a few software configurable clone cards. It appears that they expect to be initialized in some special way.
Solution: Several people have reported that running the supplied DOS software config program and/or the supplied DOS driver prior to warm booting (i.e. loadlin or the `three-finger-salute') into linux allowed the card to work. This would indicate that these cards need to be initialized in a particular fashion, slightly different than what the present Linux driver does.
Problem:
NE*000 ethercard at 0x360 doesn't get detected.
Reason:
Your NE2000 card is 0x20 wide in
I/O space, which makes it hit the parallel port at 0x378.
Other devices that could be there are the second floppy
controller (if equipped) at 0x370 and the secondary
IDE controller at 0x376--0x377.
If the port(s) are already registered by another driver, the
kernel will not let the probe happen.
Solution:
Either move your card to an address like 0x280, 0x340, 0x320
or compile without parallel printer support.
Problem: Network `goes away' every time I print something (NE2000)
Reason: Same problem as above, but you have an older kernel that doesn't check for overlapping I/O regions. Use the same fix as above, and get a new kernel while you are at it.
Problem: NE*000 ethercard probe at 0xNNN: 00 00 C5 ... not found. (invalid signature yy zz)
Reason:
First off, do you have a NE1000 or NE2000 card at the addr. 0xNNN?
And if so, does the hardware address reported look like a valid
one? If so, then you have a poor NE*000 clone. All NE*000 clones
are supposed to have the value 0x57 in bytes 14 and 15 of the
SA PROM on the card. Yours doesn't -- it has `yy zz' instead.
Solution:
There are two ways to get around this. The easiest is to
use an 0xbad mem_end value as described above for the
`no reset ack' problem. This will bypass the signature check,
as long as a non-zero I/O base is also given. This way no
recompilation of the kernel is required.
The second method (for hackers) involves changing the driver
itself, and then recompiling your kernel (or module).
The driver (/usr/src/linux/drivers/net/ne.c) has a "Hall of Shame"
list at about line 42. This list is used to detect poor clones.
For example, the DFI cards use `DFI' in the first 3 bytes of the
PROM, instead of using 0x57 in bytes 14 and 15, like they are
supposed to.
Problem: The machine hangs during boot right after the `8390...' or `WD....' message. Removing the NE2000 fixes the problem.
Solution:
Change your NE2000 base address to something like 0x340.
Alternatively, you
can use the ``reserve='' boot argument in conjunction with
the ``ether='' argument to protect the card from other
device driver probes.
Reason: Your NE2000 clone isn't a good enough clone. An active NE2000 is a bottomless pit that will trap any driver autoprobing in its space. Changing the NE2000 to a less-popular address will move it out of the way of other autoprobes, allowing your machine to boot.
Problem: The machine hangs during the SCSI probe at boot.
Reason: It's the same problem as above, change the ethercard's address, or use the reserve/ether boot arguments.
Problem: The machine hangs during the soundcard probe at boot.
Reason: No, that's really during the silent SCSI probe, and it's the same problem as above.
Problem: NE2000 not detected at boot - no boot messages at all
Solution: There is no `magic solution' as there can be a number of reasons why it wasn't detected. The following list should help you walk through the possible problems.
1) Build a new kernel with only the device drivers that you need.
Verify that you are indeed booting the fresh kernel. Forgetting to
run lilo, etc. can result in booting the old one. (Look closely at
the build time/date reported at boot.) Sounds obvious, but we have
all done it before. Make sure the driver is in fact included in
the new kernel, by checking the System.map file for names
like ne_probe.
2) Look at the boot messages carefully. Does it ever even mention
doing a ne2k probe such
as `NE*000 probe at 0xNNN: not found (blah blah)'
or does it just fail silently. There is a big difference.
Use dmesg|more
to review the boot messages after logging in, or hit Shift-PgUp
to scroll the screen up after the boot has completed and the login
prompt appears.
3) After booting, do a cat /proc/ioports and verify
that the full iospace that the card will require is vacant. If
you are at 0x300 then the ne2k driver will ask
for 0x300-0x31f. If any other device driver has registered
even one port anywhere in that range, the probe will not
take place at that address and will silently continue to the next
of the probed addresses. A common case is having the lp driver
reserve 0x378 or the second IDE channel reserve 0x376
which stops the ne driver from probing 0x360-0x380.
4) Same as above for cat /proc/interrupts. Make sure no
other device has registered the interrupt that you set
the ethercard for. In this case, the probe will happen, and the
ether driver will complain loudly at boot about not being able to
get the desired IRQ line.
5) If you are still stumped by the silent failure of the driver, then
edit it and add some printk() to the probe. For example, with the ne2k
you could add/remove lines (marked with a `+' or `-') in
linux/drivers/net/ne.c like:
int reg0 = inb_p(ioaddr);
+ printk("NE2k probe - now checking %x\n",ioaddr);
- if (reg0 == 0xFF)
+ if (reg0 == 0xFF) {
+ printk("NE2k probe - got 0xFF (vacant I/O port)\n");
return ENODEV;
+ }
Then it will output messages for each port address that it checks, and you will see if your card's address is being probed or not.
6) You can also get the ne2k diagnostic from Don's ftp site (mentioned
in the howto as well) and see if it is able to detect your card after
you have booted into linux. Use the `-p 0xNNN' option to tell it
where to look for the card. (The default is 0x300 and it doesn't
go looking elsewhere, unlike the boot-time probe.)
The output from when it finds a card will look something like:
Checking the ethercard at 0x300.
Register 0x0d (0x30d) is 00
Passed initial NE2000 probe, value 00.
8390 registers: 0a 00 00 00 63 00 00 00 01 00 30 01 00 00 00 00
SA PROM 0: 00 00 00 00 c0 c0 b0 b0 05 05 65 65 05 05 20 20
SA PROM 0x10: 00 00 07 07 0d 0d 01 01 14 14 02 02 57 57 57 57
NE2000 found at 0x300, using start page 0x40 and end page 0x80.
Your register values and PROM values will probably be different.
Note that all the PROM values are doubled for a 16 bit card, and
that the ethernet address (00:00:c0:b0:05:65) appears in the
first row, and the double 0x57 signature appears at the
end of the PROM.
The output from when there is no card installed at 0x300
will look something like this:
Checking the ethercard at 0x300. Register 0x0d (0x30d) is ff Failed initial NE2000 probe, value ff. 8390 registers: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff SA PROM 0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff SA PROM 0x10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Invalid signature found, wordlength 2.
The 0xff values arise because that is the value that
is returned when one reads a vacant I/O port. If you happen
to have some other hardware in the region that is probed, you
may see some non 0xff values as well.
7) Try warm booting into linux from a DOS boot floppy (via loadlin) after running the supplied DOS driver or config program. It may be doing some extra (i.e. non-standard) "magic" to initialize the card.
8) Try Russ Nelson's ne2000.com packet driver to see if even it can see your card -- if not, then things do not look good. Example:
A:> ne2000 0x60 10 0x300
The arguments are software interrupt vector, hardware IRQ, and I/O base. You can get it from any msdos archive in pktdrv11.zip -- The current version may be newer than 11.
Problem: You get messages such as the following:
eth0: bogus packet size: 65531, status=0xff, nxpg=0xff
Reason: There is a shared memory problem.
Solution:
The most common reason for this is PCI machines that are
not configured to map in ISA memory devices. Hence you
end up reading the PC's RAM (all 0xff values) instead of
the RAM on the card that contains the data from the
received packet.
Other typical problems that are easy to fix are board conflicts, having cache or `shadow ROM' enabled for that region, or running your ISA bus faster than 8Mhz. There are also a surprising number of memory failures on ethernet cards, so run a diagnostic program if you have one for your ethercard.
Problem: SMC EtherEZ doesn't work in non-shared memory (PIO) mode.
Reason: Older versions of the Ultra driver only supported the card in the shared memory mode of operation.
Solution: The driver in kernel version 2.0 and above also supports the programmed I/O mode of operation. Upgrade to v2.0 or newer.
Problem: Old wd8003 and/or jumper-settable wd8013 always get the IRQ wrong.
Reason: The old wd8003 cards and jumper-settable wd8013 clones don't have the EEPROM that the driver can read the IRQ setting from. If the driver can't read the IRQ, then it tries to auto-IRQ to find out what it is. And if auto-IRQ returns zero, then the driver just assigns IRQ 5 for an 8 bit card or IRQ 10 for a 16 bit card.
Solution: Avoid the auto-IRQ code, and tell the kernel what the IRQ that you have jumpered the card to in your module configuration file (or via a boot time argument for in-kernel drivers).
Problem: SMC Ultra card is detected as wd8013, but the IRQ and shared memory base is wrong.
Reason: The Ultra card looks a lot like a wd8013, and if the Ultra driver is not present in the kernel, the wd driver may mistake the ultra as a wd8013. The ultra probe comes before the wd probe, so this usually shouldn't happen. The ultra stores the IRQ and mem base in the EEPROM differently than a wd8013, hence the bogus values reported.
Solution: Recompile with only the drivers you need in the kernel. If you have a mix of wd and ultra cards in one machine, and are using modules, then load the ultra module first.
Problem: The 3c503 picks IRQ N, but this is needed for some other device which needs IRQ N. (eg. CD ROM driver, modem, etc.) Can this be fixed without compiling this into the kernel?
Solution:
The 3c503 driver probes for a free IRQ line in the order
{5, 9/2, 3, 4}, and it should pick a line which isn't being
used. The driver chooses when
the card is ifconfig'ed into operation.
If you are using a modular driver, you can use module parameters to set various things, including the IRQ value.
The following selects IRQ9, base
location 0x300, <ignored value>, and if_port #1 (the
external transceiver).
io=0x300 irq=9 xcvr=1
Alternately, if the driver is compiled into the kernel, you can set the same values at boot by passing parameters via LILO.
LILO: linux ether=9,0x300,0,1,eth0
The following selects IRQ3, probes for the base location, <ignored value>, and the default if_port #0 (the internal transceiver)
LILO: linux ether=3,0,0,0,eth0
Problem: 3c503: configured interrupt X invalid, will use autoIRQ.
Reason: The 3c503 card can only use one of IRQ{5, 2/9, 3, 4} (These are the only lines that are connected to the card.) If you pass in an IRQ value that is not in the above set, you will get the above message. Usually, specifying an interrupt value for the 3c503 is not necessary. The 3c503 will autoIRQ when it gets ifconfig'ed, and pick one of IRQ{5, 2/9, 3, 4}.
Solution: Use one of the valid IRQs listed above, or enable autoIRQ by not specifying the IRQ line at all.
Problem: The supplied 3c503 drivers don't use the AUI (thicknet) port. How does one choose it over the default thinnet port?
Solution: The 3c503 AUI port can be selected at boot-time for in-kernel drivers, and at module insertion for modular drivers. The selection is overloaded onto the low bit of the currently-unused dev->rmem_start variable, so a boot-time parameter of:
LILO: linux ether=0,0,0,1,eth0
should work for in-kernel drivers.
To specify the AUI port when loading as a module, just append
xcvr=1 to the module options line along with
your I/O and IRQ values.
For best results (and minimum aggravation) it is recommended
that you use the (usually DOS) program that came with your
card to disable the PnP mechanism and set it to a fixed
I/O address and IRQ. Make sure the I/O address you use is
probed by the driver at boot, or if using modules then supply
the address as an io= option in /etc/conf.modules.
You may also have to enter the BIOS/CMOS setup and mark the IRQ
as Legacy-ISA instead of PnP (if your computer has this option).
Note that you typically don't need DOS installed to run a DOS based configuration program. You can usually just boot a DOS floppy disk and run them from the supplied floppy disk. You can also download OpenDOS and FreeDOS for free.
If you require PnP enabled for compatibility with some other
operating system then you will have to use the isapnptools
package with linux to configure the card(s) each time at boot.
You will still have to make sure the I/O address chosen for the
card is probed by the driver or supplied as an io= option.
The usual reason for this is that people are using a kernel that does not have support for their particular card built in. For a modular kernel, it usually means that the required module has not been requested for loading, or that an I/O address needs to be specified as a module option.
If you are using a modular based kernel, such as those installed
by most of the linux distributions, then try and use the
configuration utility for the distribution to select the module
for your card. For ISA cards, it is a good idea to determine
the I/O address of the card and add it as an
option (e.g. io=0x340) if the configuration utility asks
for any options. If there is no configuration utility, then
you will have to add the correct module name (and options)
to /etc/conf.modules -- see man modprobe for
more details.
If you are using a pre-compiled kernel that is part of a distribution set, then check the documentation to see which kernel you installed, and if it was built with support for your particular card. If it wasn't, then your options are to try and get one that has support for your card, or build your own.
It is usually wise to build your own kernel with only the drivers you need, as this cuts down on the kernel size (saving your precious RAM for applications!) and reduces the number of device probes that can upset sensitive hardware. Building a kernel is not as complicated as it sounds. You just have to answer yes or no to a bunch of questions about what drivers you want, and it does the rest.
The next main cause is having another device using part
of the I/O space that your card needs. Most cards are
16 or 32 bytes wide in I/O space. If your card is set
at 0x300 and 32 bytes wide, then the driver will ask
for 0x300-0x31f. If any other device driver has registered
even one port anywhere in that range, the probe will not
take place at that address and the driver will silently
continue to the next of the probed addresses. So, after
booting, do a cat /proc/ioports and verify that the
full I/O space that the card will require is vacant.
Another problem is having your card jumpered to an I/O
address that isn't probed by default. The list of
probed addresses for each driver is easily found just
after the text comments in the driver source.
Even if the I/O setting of your card is
not in the list of probed addresses, you can supply
it at boot (for in-kernel drivers) with
the ether= command as described in
Passing Ethernet Arguments...
Modular drivers can make use of the io= option
in /etc/conf.modules to
specify an address that isn't probed by default.
ifconfig reports the wrong I/O address for the card.
No it doesn't. You are just interpreting it incorrectly.
This is not a bug, and the numbers reported are correct. It just
happens that some 8390 based cards (wd80x3, smc-ultra, etc) have the
actual 8390 chip living at an offset from the first assigned I/O port.
This is the value stored in
dev->base_addr, and is what ifconfig reports. If you
want to see the full range of ports that your card uses, then try
cat /proc/ioports which will give the numbers you expect.
Some PCI BIOSes may not enable all PCI cards at power-up, especially if the BIOS option `PNP OS' is enabled. This mis-feature is to support the current release of Windows which still uses some real-mode drivers. Either disable this option, or try and upgrade to a newer driver which has the code to enable a disabled card.
0xffff)
This will usually show up as reads of lots of 0xffff values.
No shared memory cards of any type will work in a PCI machine
unless you have the PCI ROM BIOS/CMOS SETUP configuration set
properly. You have to set it to allow shared memory access
from the ISA bus for the memory region that your card is trying
to use. If you can't figure out which settings are applicable
then ask your supplier or local computer guru. For AMI BIOS,
there is usually a "Plug and Play" section where there will
be an ``ISA Shared Memory Size'' and ``ISA Shared Memory Base''
settings. For cards like the wd8013 and SMC Ultra, change the
size from the default of `Disabled' to 16kB, and change the base
to the shared memory address of your card.
Do a cat /proc/interrupts.
A running total of the number of interrupt events your
card generates will be in the list given from the above.
If it is zero and/or doesn't increase when you try to use
the card then there is probably a physical interrupt
conflict with another device installed in the computer
(regardless of whether or not the other device has a
driver installed/available).
Change the IRQ of one of the two devices to a free IRQ.
Werner Almesberger has been working on ATM support for linux. He has been working with the Efficient Networks ENI155p board ( Efficient Networks) and the Zeitnet ZN1221 board ( Zeitnet).
Werner says that the driver for the ENI155p is rather stable, while the driver for the ZN1221 is presently unfinished.
Check the latest/updated status at the following URL:
Is there any gigabyte ethernet support for Linux?
Yes, there are currently at least two. A driver for the Packet Engines G-NIC PCI Gigabit Ethernet adapter is available in the v2.0 and v2.2 kernels For more details, support, and driver updates, see:
http://cesdis.gsfc.nasa.gov/linux/drivers/yellowfin.html
The acenic.c driver available in the v2.2 kernels
can be used for the Alteon AceNIC Gigabit Ethernet card
and other Tigon based cards such as the 3Com 3c985.
The driver should also work on the NetGear GA620, however
this has yet to be verified.
Is there FDDI support for Linux?
Yes. Larry Stefani has written a driver for v2.0 with Digital's DEFEA (FDDI EISA) and DEFPA (FDDI PCI) cards. This was included into the v2.0.24 kernel. Currently no other cards are supported though.
Will Full Duplex give me 20MBps? Does Linux support it?
Cameron Spitzer writes the following about full duplex 10Base-T cards: ``If you connect it to a full duplex switched hub, and your system is fast enough and not doing much else, it can keep the link busy in both directions. There is no such thing as full duplex 10BASE-2 or 10BASE-5 (thin and thick coax). Full Duplex works by disabling collision detection in the adapter. That's why you can't do it with coax; the LAN won't run that way. 10BASE-T (RJ45 interface) uses separate wires for send and receive, so it's possible to run both ways at the same time. The switching hub takes care of the collision problem. The signalling rate is 10 Mbps.''
So as you can see, you still will only be able to receive or transmit at 10Mbps, and hence don't expect a 2x performance increase. As to whether it is supported or not, that depends on the card and possibly the driver. Some cards may do auto-negotiation, some may need driver support, and some may need the user to select an option in a card's EEPROM configuration. Only the serious/heavy user would notice the difference between the two modes anyway.
If you spent the extra money on a multi processor (MP) computer then
buy a good ethernet card as well. For v2.0 kernels it wasn't really
an issue, but it definitely is for v2.2. Most of the older
non-intelligent (e.g. ISA bus PIO and shared memory design) cards
were never designed with any consideration for use on a MP machine.
The executive summary is to buy an intelligent modern design
card and make sure the driver has been written (or updated) to
handle MP operation. (The key words here are `modern design' - the
PCI-NE2000's are just a 10+ year old design on a modern bus.)
Looking for the text spin_lock in the driver source is a good
indication that the driver has been written to deal with MP operation.
The full details of why you should buy a good card for MP use (and
what happens if you dont) follow.
In v2.0 kernels, only one processor was allowed `in kernel' (i.e. changing kernel data and/or running device drivers) at any given time. So from the point of view of the card (and the associated driver) nothing was different from uni processor (UP) operation and things just continued to work. (This was the easiest way to get a working MP version of Linux - one big lock around the whole kernel only allows one processor in at a time. This way you know that you won't have two processors trying to change the same thing at the same time!)
The downside to only allowing one processor in the kernel at a time was that you only got MP performance if the running programs were self contained and calculation intensive. If the programs did a lot of input/output (I/O) such as reading or writing data to disk or over a network, then all but one of the processors would be stalled waiting on their I/O requests to be completed while the one processor running in kernel frantically tries to run all the device drivers to fill the I/O requests. The kernel becomes the bottleneck and since there is only one processor running in the kernel, the performance of a MP machine in the heavy I/O, single-lock case quickly degrades close to that of a single processor machine.
Since this is clearly less than ideal (esp. for file/WWW servers, routers, etc.) the v2.2 kernels have finer grained locking - meaning that more than one processor can be in the kernel at a time. Instead of one big lock around the whole kernel, there are a lot of smaller locks protecting critical data from being manipulated by more than one processor at a time - e.g. one processor can be running the driver for the network card, while another processor is running the driver for the disk drive at the same time.
Okay, with that all in mind here are the snags: The finer locking
means that you can have one processor trying to send data
out through an ethernet driver while another processor tries to
access the same driver/card to do something else (such as get the
card statistics for cat /proc/net/dev). Oops - your card
stats just got sent out over the wire, while you got data for
your stats instead. Yes, the card got confused by being asked
to do two (or more!) things at once, and chances are it crashed
your machine in the process.
So, the driver that worked for UP is no longer good enough - it needs to be updated with locks that control access to the underlying card so that the three tasks of receive, transmit and manipulation of configuration data are serialized to the degree required by the card for stable operation. The scary part here is that a driver not yet updated with locks for stable MP operation will probably appear to be working in a MP machine under light network load, but will crash the machine or at least exhibit strange behaviour when two (or more!) processors try to do more than one of these three tasks at the same time.
The updated MP aware ethernet driver will (at a
minimum) require a lock
around the driver that limits access at the entry points
from the kernel into the driver to `one at a time please'.
With this in place, things will be serialized so that the
underlying hardware should be treated just as if it was being
used in a UP machine, and so it should be stable. The downside
is that the one lock around the whole ethernet driver has
the same negative performance implications that having one big
lock around the whole kernel had (but on a smaller scale) - i.e.
you can only have one processor dealing with the card
at a time.
[Technical Note: The performance impact may also include
increased interrupt latencies if the locks that need to be
added are of the irqsave type and they are held
for a long time.]
Possible improvements on this situation can be made in two ways. You can try to minimize the time between when the lock is taken and when it is released, and/or you can implement finer grained locking within the driver (e.g. a lock around the whole driver would be overkill if a lock or two protecting against simultaneous access to a couple of sensitive registers/settings on the card would suffice).
However, for older non-intelligent cards that were never designed with MP use in mind, neither of these improvements may be feasible. Worse yet is that the non-intelligent cards typically require the processor to move the data between the card and the computer memory, so in a worst case scenario the lock will be held the whole time that it takes to move each 1.5kB data packet over an ISA bus.
The more modern intelligent cards typically move network data directly to and from the computer memory without any help from a processor. This is a big win, since the lock is then only held for the short time it takes the processor to tell the card where in memory to get/store the next network data packet. More modern card designs are less apt to require a single big lock around the whole driver as well.
As of v2.0, only the 3c509, depca, de4x5, pcnet32, and all the 8390 drivers (wd, smc-ultra, ne, 3c503, etc.) have been made `architecture independent' so as to work on the DEC Alpha CPU based systems. Other updated PCI drivers from Donald's WWW page may also work as these have been written with architecture independence in mind.
Note that the changes that are required to make a driver architecture independent aren't that complicated. You only need to do the following:
-multiply all jiffies related values by HZ/100 to account
for the different HZ value that the Alpha uses.
(i.e timeout=2; becomes timeout=2*HZ/100;)
-replace any I/O memory (640k to 1MB) pointer dereferences with the appropriate readb() writeb() readl() writel() calls, as shown in this example.
- int *mem_base = (int *)dev->mem_start; - mem_base[0] = 0xba5eba5e; + unsigned long mem_base = dev->mem_start; + writel(0xba5eba5e, mem_base);
-replace all memcpy() calls that have I/O memory as source or
target destinations with the appropriate one of
memcpy_fromio() or memcpy_toio().
Details on handling memory accesses in an architecture
independent fashion are documented in the file
linux/Documentation/IO-mapping.txt that comes
with recent kernels.
For the most up to date information on Sparc stuff, try the following URL:
Note that some Sparc ethernet hardware gets its MAC address
from the host computer, and hence you can end up with multiple
interfaces all with the same MAC address. If you need to
put more than one interface on the same net then use the
hw option to ifconfig to assign unique MAC address.
Issues regarding porting PCI drivers to the Sparc platform are similar to those mentioned above for the AXP platform. In addition there may be some endian issues, as the Sparc is big endian, and the AXP and ix86 are little endian.
There are several other hardware platforms that Linux can run on, such as Atari/Amiga (m68k). As in the Sparc case it is best to check with the home site of each Linux port to that platform to see what is currently supported. (Links to such sites are welcome here - send them in!)
Can I link 10/100BaseT (RJ45) based systems together without a hub?
You can link 2 machines easily, but no more than that, without extra devices/gizmos. See Twisted Pair -- it explains how to do it. And no, you can't hack together a hub just by crossing a few wires and stuff. It's pretty much impossible to do the collision signal right without duplicating a hub.
I get a bunch of `SIOCSIFxxx: No such device' messages at boot, followed by a `SIOCADDRT: Network is unreachable' What is wrong?
Your ethernet device was not detected at boot/module insertion
time, and when
ifconfig and route are run, they have no device
to work with. Use dmesg | more to review the
boot messages and see if there are any messages about
detecting an ethernet card.
I get `SIOCSFFLAGS: Try again' when I run `ifconfig' -- Huh?
Some other device has taken the IRQ that your ethercard
is trying to use, and so the ethercard can't use the IRQ.
You don't necessairly need to reboot to resolve this, as
some devices only grab the IRQs when they need them and
then release them when they are done. Examples are some
sound cards, serial ports, floppy disk driver, etc. You
can type cat /proc/interrupts to see which interrupts
are presently in use. Most of the
Linux ethercard drivers only grab the IRQ when they are
opened for use via `ifconfig'. If you can get the other
device to `let go' of the required IRQ line, then you
should be able to `Try again' with ifconfig.
When I run ifconfig with no arguments, it reports that LINK is UNSPEC (instead of 10Mbs Ethernet) and it also says that my hardware address is all zeros.
This is because people are running a newer version of the `ifconfig' program than their kernel version. This new version of ifconfig is not able to report these properties when used in conjunction with an older kernel. You can either upgrade your kernel, `downgrade' ifconfig, or simply ignore it. The kernel knows your hardware address, so it really doesn't matter if ifconfig can't read it.
You may also get strange information if the ifconfig
program you are using is a lot older than the kernel you are
using.
When I run ifconfig with no arguments, it reports that I have a huge error count in both rec'd and transmitted packets. It all seems to work ok -- What is wrong?
Look again. It says RX packets big number PAUSE
errors 0 PAUSE dropped 0 PAUSE overrun 0.
And the same for the TX column.
Hence the big numbers you are seeing are the total number of
packets that your machine has rec'd and transmitted.
If you still find it confusing, try typing
cat /proc/net/dev instead.
/dev/ for EthercardsI have /dev/eth0 as a link to /dev/xxx. Is this right?
Contrary to what you have heard, the files in /dev/* are not used.
You can delete any /dev/wd0, /dev/ne0 and similar entries.
Should I disable trailers when I `ifconfig' my ethercard?
You can't disable trailers, and you shouldn't want to. `Trailers' are a hack to avoid data copying in the networking layers. The idea was to use a trivial fixed-size header of size `H', put the variable-size header info at the end of the packet, and allocate all packets `H' bytes before the start of a page. While it was a good idea, it turned out to not work well in practice. If someone suggests the use of `-trailers', note that it is the equivalent of sacrificial goats blood. It won't do anything to solve the problem, but if problem fixes itself then someone can claim deep magical knowledge.
How do I get access to the raw ethernet device in linux, without going through TCP/IP and friends?
int s=socket(AF_INET,SOCK_PACKET,htons(ETH_P_ALL));
This gives you a socket receiving every protocol type.
Do recvfrom() calls to it and it will fill the sockaddr
with device type in sa_family and the device name in the
sa_data array. I don't know who originally invented
SOCK_PACKET for Linux (its been in for ages) but its superb stuff.
You can use it to send stuff raw too via sendto() calls.
You have to have root access to do either of course.
Here are some tips that you can use if you are suffering from low ethernet throughput, or to gain a bit more speed on those ftp transfers.
The ttcp.c program is a good test for measuring
raw throughput speed. Another common trick is to do
a ftp> get large_file /dev/null where
large_file is > 1MB and residing in the buffer
cache on the Tx'ing machine. (Do the `get' at least
twice, as the first time will be priming the buffer
cache on the Tx'ing machine.) You want the file in
the buffer cache because you are not interested in
combining the file access speed from the disk into
your measurement. Which is also why you send the
incoming data to /dev/null instead of onto
the disk.
Even an 8 bit card is able to receive back-to-back packets without any problems. The difficulty arises when the computer doesn't get the Rx'd packets off the card quick enough to make room for more incoming packets. If the computer does not quickly clear the card's memory of the packets already received, the card will have no place to put the new packet.
In this case the card either drops the new packet, or writes over top of a previously received packet. Either one seriously interrupts the smooth flow of traffic by causing/requesting re-transmissions and can seriously degrade performance by up to a factor of 5!
Cards with more onboard memory are able to ``buffer'' more packets, and thus can handle larger bursts of back-to-back packets without dropping packets. This in turn means that the card does not require as low a latency from the the host computer with respect to pulling the packets out of the buffer to avoid dropping packets.
Most 8 bit cards have an 8kB buffer, and most 16 bit cards have a 16kB buffer. Most Linux drivers will reserve 3kB of that buffer (for two Tx buffers), leaving only 5kB of receive space for an 8 bit card. This is room enough for only three full sized (1500 bytes) ethernet packets.
As mentioned above, if the packets are removed from the card fast enough, then a drop/overrun condition won't occur even when the amount of Rx packet buffer memory is small. The factor that sets the rate at which packets are removed from the card to the computer's memory is the speed of the data path that joins the two -- that being the ISA bus speed. (If the CPU is a dog-slow 386sx-16, then this will also play a role.)
The recommended ISA bus clock is about 8MHz, but many motherboards and peripheral devices can be run at higher frequencies. The clock frequency for the ISA bus can usually be set in the CMOS setup, by selecting a divisor of the mainboard/CPU clock frequency. Some ISA and PCI/ISA mainboards may not have this option, and so you are stuck with the factory default.
For example, here are some receive speeds as measured by the TTCP program on a 40MHz 486, with an 8 bit WD8003EP card, for different ISA bus speeds.
ISA Bus Speed (MHz) Rx TTCP (kB/s)
------------------- --------------
6.7 740
13.4 970
20.0 1030
26.7 1075
You would be hard pressed to do better than 1075kB/s with any 10Mb/s ethernet card, using TCP/IP. However, don't expect every system to work at fast ISA bus speeds. Most systems will not function properly at speeds above 13MHz. (Also, some PCI systems have the ISA bus speed fixed at 8MHz, so that the end user does not have the option of increasing it.)
In addition to faster transfer speeds, one will usually also benefit from a reduction in CPU usage due to the shorter duration memory and I/O cycles. (Note that hard disks and video cards located on the ISA bus will also usually experience a performance increase from an increased ISA bus speed.)
Be sure to back up your data prior to experimenting with ISA bus speeds in excess of 8MHz, and thouroughly test that all ISA peripherals are operating properly after making any speed increases.
Once again, cards with small amounts of onboard RAM and relatively slow data paths between the card and the computer's memory run into trouble. The default TCP Rx window setting is 32kB, which means that a fast computer on the same subnet as you can dump 32k of data on you without stopping to see if you received any of it okay.
Recent versions of the route command have the ability
to set the size of this window on the fly. Usually it is only
for the local net that this window must be reduced, as computers
that are behind a couple of routers or gateways are `buffered'
enough to not pose a problem. An example usage would be:
route add <whatever> ... window <win_size>
where win_size is the size of the window you wish to
use (in bytes). An 8 bit 3c503 card on an ISA bus operating
at a speed of 8MHz or less would work well with a window
size of about 4kB. Too large a window will cause overruns
and dropped packets, and a drastic reduction in ethernet
throughput. You can check the operating status by doing
a cat /proc/net/dev which will display any
dropped or overrun conditions that occurred.
Some people have found that using 8 bit cards in NFS clients causes poorer than expected performance, when using 8kB (native Sun) NFS packet size.
The possible reason for this could be due to the difference in on board buffer size between the 8 bit and the 16 bit cards. The maximum ethernet packet size is about 1500 bytes. Now that 8kB NFS packet will arrive as about 6 back to back maximum size ethernet packets. Both the 8 and 16 bit cards have no problem Rx'ing back to back packets. The problem arises when the machine doesn't remove the packets from the cards buffer in time, and the buffer overflows. The fact that 8 bit cards take an extra ISA bus cycle per transfer doesn't help either. What you can do if you have an 8 bit card is either set the NFS transfer size to 2kB (or even 1kB), or try increasing the ISA bus speed in order to get the card's buffer cleared out faster. I have found that an old WD8003E card at 8MHz (with no other system load) can keep up with a large receive at 2kB NFS size, but not at 4kB, where performance was degraded by a factor of three.
On the other hand, if the default mount option is to use 1kB size and you have at least a 16 bit ISA card, you may find a significant increase in going to 4kB (or even 8kB).
The following lists many cards in alphabetical order by vendor name and then product identifier. Beside each product ID, you will see either `Supported', `Semi-Supported' or `Not Supported'.
Supported means that a driver for that card exists, and many people are happily using it and it seems quite reliable.
Semi-Supported means that a driver exists, but at least one
of the following descriptions is true:
(1) The driver and/or hardware are buggy, which may cause poor
performance, failing connections or even crashes.
(2) The driver is new or the card is fairly uncommon,
and hence the driver has
seen very little use/testing and the driver author has had
very little feedback. Obviously (2) is preferable to (1), and
the individual description of the card/driver should make it
clear which one holds true. In either case, you will probably have
to answer `Y' when asked ``Prompt for development and/or
incomplete code/drivers?'' when running make config.
Not Supported means there is not a driver currently available for that card. This could be due to a lack of interest in hardware that is rare/uncommon, or because the vendors won't release the hardware documentation required to write a driver.
Note that the difference between `Supported' and `Semi-Supported' is rather subjective, and is based on user feedback observed in newsgroup postings and mailing list messages. (After all, it is impossible for one person to test all drivers with all cards for each kernel version!!!) So be warned that you may find a card listed as semi-supported works perfectly for you (which is great), or that a card listed as supported gives you no end of troubles and problems (which is not so great).
After the status, the name of the driver given in the linux kernel
is listed. This will also be the name of the driver module that
would be used in the alias eth0 driver_name line that is
found in the /etc/conf.modules module configuration file.
If you are not sure what your card is, but you think it is a 3Com card, you can probably figure it out from the assembly number. 3Com has a document `Identifying 3Com Adapters By Assembly Number' (ref 24500002) that would most likely clear things up. See Technical Information from 3Com for info on how to get documents from 3Com.
Also note that 3Com has a FTP site with various goodies:
ftp.3Com.com that you may want to check out.
For those of you browsing this document by a WWW browser, you can try 3Com's WWW site as well.
Status: Semi-Supported, Driver Name: 3c501
This obsolete stone-age 8 bit card is really too brain-damaged to use. Avoid it like the plague. Do not purchase this card, even as a joke. It's performance is horrible, and it breaks in many ways.
For those not yet convinced, the 3c501 can only do one thing at a time -- while you are removing one packet from the single-packet buffer it cannot receive another packet, nor can it receive a packet while loading a transmit packet. This was fine for a network between two 8088-based computers where processing each packet and replying took 10's of msecs, but modern networks send back-to-back packets for almost every transaction.
AutoIRQ works, DMA isn't used, the autoprobe only
looks at 0x280 and 0x300, and the debug level is set
with the third boot-time argument.
Once again, the use of a 3c501 is strongly discouraged! Even more so with a IP multicast kernel, as you will grind to a halt while listening to all multicast packets. See the comments at the top of the source code for more details.
Status: Supported, Driver Name: 3c503 (+8390)
The 3c503 does not have ``EEPROM setup'', so a diagnostic/setup program isn't needed before running the card with Linux. The shared memory address of the 3c503 is set using jumpers that are shared with the boot PROM address. This is confusing to people familiar with other ISA cards, where you always leave the jumper set to ``disable'' unless you have a boot PROM.
These cards should be about the same speed as the same bus width WD80x3, but turn out to be actually a bit slower. These shared-memory ethercards also have a programmed I/O mode that doesn't use the 8390 facilities (their engineers found too many bugs!) The Linux 3c503 driver can also work with the 3c503 in programmed-I/O mode, but this is slower and less reliable than shared memory mode. Also, programmed-I/O mode is not as well tested when updating the drivers. You shouldn't use the programmed-I/O mode unless you need it for MS-DOS compatibility.
The 3c503's IRQ line is set in software, with no hints from an EEPROM. Unlike the MS-DOS drivers, the Linux driver has capability to autoIRQ: it uses the first available IRQ line in {5,2/9,3,4}, selected each time the card is ifconfig'ed. (Older driver versions selected the IRQ at boot time.) The ioctl() call in `ifconfig' will return EAGAIN if no IRQ line is available at that time.
Some common problems that people have with the 503 are discussed in Problems with....
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Note that some old diskless 386 workstations have an on board 3c503 (made by 3Com and sold under different names, like `Bull') but the vendor ID is not a 3Com ID and so it won't be detected. More details can be found in the Etherboot package, which you will need anyways to boot these diskless boxes.
Status: Semi-Supported, Driver Name: 3c505
This is a driver that was written by Craig Southeren
geoffw@extro.ucc.su.oz.au. These cards also
use the i82586 chip.
There are not that many of these cards about.
It is included in the standard kernel, but it is classed as
an alpha driver. See
Alpha Drivers
for important information on using alpha-test ethernet drivers
with Linux.
There is also the file
/usr/src/linux/drivers/net/README.3c505
that you should read if you are going to use one of these cards.
It contains various options that you can enable/disable.
Status: Semi-Supported, Driver Name: 3c507
This card uses one of the Intel chips, and the development of the driver is closely related to the development of the Intel Ether Express driver. The driver is included in the standard kernel release, but as an alpha driver. See Alpha Drivers for important information on using alpha-test ethernet drivers with Linux.
Status: Supported, Driver Name: 3c509
This card is fairly inexpensive and has good performance for an ISA non-bus-master design. The drawbacks are that the original 3c509 requires very low interrupt latency. The 3c509B shouldn't suffer from the same problem, due to having a larger buffer. (See below.) These cards use PIO transfers, similar to a ne2000 card, and so a shared memory card such as a wd8013 will be more efficient in comparison.
The original 3c509 has a small packet buffer
(4kB total, 2kB Rx, 2kB Tx), causing the driver to
occasionally drop a packet if interrupts are masked for
too long. To minimize this problem, you can try unmasking
interrupts during IDE disk transfers (see man hdparm) and/or
increasing your ISA bus speed so IDE transfers finish sooner.
The newer model 3c509B has 8kB on board, and the buffer can be split 4/4, 5/3 or 6/2 for Rx/Tx. This setting is changed with the DOS configuration utility, and is stored on the EEPROM. This should alleviate the above problem with the original 3c509.
3c509B users should use either the supplied DOS
utility to disable the plug and play support, and
to set the output media to what they require. The linux
driver currently does not support the Autodetect
media setting, so you have to select 10Base-T or
10Base-2 or AUI.
Note that to turn off PnP entirely, you should do a
3C5X9CFG /PNP:DISABLE and then follow that with a hard
reset to ensure that it takes effect.
Some people ask about the ``Server or Workstation'' and ``Highest Modem Speed'' settings presented in the DOS configuration utility. Donald writes ``These are only hints to the drivers, and the Linux driver does not use these parameters: it always optimizes for high throughput rather than low latency (`Server'). Low latency was critically important for old, non-windowed, IPX throughput. To reduce the latency the MS-DOS driver for the 3c509 disables interrupts for some operations, blocking serial port interrupts. Thus the need for the `modem speed' setting. The Linux driver avoids the need to disable interrupts for long periods by operating only on whole packets e.g. by not starting to transmit a packet until it is completely transferred to the card.''
Note that the ISA card detection uses a different method
than most cards. Basically, you ask the cards to respond
by sending data to an ID_PORT (port 0x100 to 0x1ff
on intervals of 0x10).
This detection method means that
a particular card will always get detected first
in a multiple ISA 3c509 configuration.
The card with the lowest hardware ethernet address
will always end up being eth0. This shouldn't matter
to anyone, except for those people who want to assign
a 6 byte hardware address to a particular interface.
If you have multiple 3c509 cards, it is best to append
ether=0,0,ethN commands without the I/O port specified
(i.e. use I/O=zero) and allow the probe to sort out which
card is first. Using a non-zero I/O value will ensure that it
does not detect all your cards, so don't do it.
If this really bothers you, have a look at Donald's latest driver,
as you may be able to use a 0x3c509 value in the unused mem
address fields to order the detection to suit your needs.
Status: Supported, Driver Name: 3c515
This is 3Com's ISA 100Mbps offering, codenamed ``CorkScrew''. A relatively new driver from Donald for these cards is included in the v2.2 kernels. For the most up to date information, you should probably look on the Vortex page:
Status: Semi-Supported, Driver Name: 3c523
This MCA bus card uses the i82586, and Chris Beauregard has modified the ni52 driver to work with these cards. The driver for it can be found in the v2.2 kernel source tree.
More details can be found on the
MCA-Linux page at http://glycerine.cetmm.uni.edu/mca/
Status: Not Supported.
Yes, another MCA card. No, not too much interest in it. Better chances with the 3c529 if you are stuck with MCA.
Status: Supported, Driver Name: 3c509
This card actually uses the same chipset as the 3c509. Donald actually put hooks into the 3c509 driver to check for MCA cards after probing for EISA cards, and before probing for ISA cards, long before MCA support was added to the kernel. The required MCA probe code is included in the driver shipped with v2.2 kernels. More details can be found on the MCA-Linux page at:
http://glycerine.cetmm.uni.edu/mca/
Status: Supported, Driver Name: 3c589 (distributed separately)
This PCMCIA card is the combination of a 3c589B ethernet card with a modem. The modem appears as a standard modem to the end user. The only difficulty is getting the two separate linux drivers to share one interrupt. There are a couple of new registers and some hardware interrupt sharing support. You need to use a v2.0 or newer kernel that has the support for interrupt sharing.
Thanks again to Cameron for getting a sample unit and documentation sent off to David Hinds. Look for support in David's PCMCIA package release.
See PCMCIA Support for more info on PCMCIA chipsets, socket enablers, etc.
Status: Unknown.
A driver for this PCMCIA card is under development and hopefully will be included in David's PCMCIA package in the future. Best to check the PCMCIA package to get the current status.
Status: Supported, Driver Name: 3c509
The EISA version of the 509. The current EISA version uses the same 16 bit wide chip rather than a 32 bit interface, so the performance increase isn't stunning. Make sure the card is configured for EISA addressing mode. Read the above 3c509 section for info on the driver.
Status: Semi-Supported, Driver Name: 3c589
Many people have been using this PCMCIA card for quite some time now. Note that support for it is not (at present) included in the default kernel source tree. The "B" in the name means the same here as it does for the 3c509 case.
There are drivers available on Donald's ftp site and in David Hinds PCMCIA package. You will also need a supported PCMCIA controller chipset. See PCMCIA Support for more info on PCMCIA drivers, chipsets, socket enablers, etc.
Status: Supported, Driver Name: 3c59x
These ``Vortex'' cards are for PCI bus machines, with the '590 being 10Mbps and the '595 being 3Com's 100Mbs offering. Also note that you can run the '595 as a '590 (i.e. in a 10Mbps mode). The driver is included in the v2.0 kernel source, but is also continually being updated. If you have problems with the driver in the v2.0 kernel, you can get an updated driver from the following URL:
Note that there are two different 3c590 cards out there, early models that had 32kB of on-board memory, and later models that only have 8kB of memory. Chances are you won't be able to buy a new 3c59x for much longer, as it is being replaced with the 3c90x card. If you are buying a used one off somebody, try and get the 32kB version. The 3c595 cards have 64kB, as you can't get away with only 8kB RAM at 100Mbps!
A thanks to Cameron Spitzer and Terry Murphy of 3Com for sending cards and documentation to Donald so he could write the driver.
Donald has set up a mailing list for Vortex driver support. To join the list, just do:
echo subscribe | /bin/mail
linux-vortex-request@cesdis.gsfc.nasa.gov
Status: Supported, Driver Name: 3c59x
These are the EISA versions of the 3c59x series of cards. The 3c592/3c597 (aka Demon) should work with the vortex driver discussed above.
Status: Supported, Driver Name: 3c59x
These cards (aka `Boomerang', aka EtherLink III XL) have been released to take over the place of the 3c590/3c595 cards.
The support for the Cyclone `B' revision was only recently added.
To use this card with older v2.0 kernels, you must obtain the
updated 3c59x.c driver from Donald's site at:
If in doubt about anything then check out the above WWW page. Donald has set up a mailing list for Vortex driver support announcements and etc. To join the list, just do:
echo subscribe | /bin/mail
linux-vortex-request@cesdis.gsfc.nasa.gov
Status: Supported, Driver Name: acenic
This driver, by Jes Sorensen, is available in v2.2 kernels It supports several other Gigabit cards in addition to the 3Com model.
Status: Supported, Driver Name: ne (+8390)
Don't let the name fool you. This is still supposed to be a NE2000 compatible card, and should work with the ne2000 driver.
Status: Supported, Driver Name: de4x5, tulip
This is another implementation of the DEC 21040 PCI chip. The EN1207 card has the 21140, and also has a 10Base-2 connector, which has proved troublesome for some people in terms of selecting that media. Using the card with 10Base-T and 100Base-T media have worked for others though. So as with all purchases, you should try and make sure you can return it if it doesn't work for you.
See DEC 21040 for more information on these cards, and the present driver situation.
Status: Semi-Supported, Driver Name: ?
A driver for these parallel port adapters is available but not yet part of the 2.0 or 2.1 kernel source. You have to get the driver from:
http://www.unix-ag.uni-siegen.de/~nils/accton_linux.html
Status: Semi-Supported, Driver Name: ?
David Hinds has been working on a driver for this card, and you are best to check the latest release of his PCMCIA package to see what the present status is.
Status: Supported, Driver Name: lance
These are a series of low-cost ethercards using the 79C960 version of the AMD LANCE. These are bus-master cards, and hence one of the faster ISA bus ethercards available.
DMA selection and chip numbering information can be found in AMD LANCE.
More technical information on AMD LANCE based Ethernet cards can be found in Notes on AMD....
Status: Supported, Driver Name: at1700
Note that to access this driver during make config
you still have to answer `Y' when asked ``Prompt for
development and/or incomplete code/drivers?'' at
the first. This is simply due to lack of feedback on the
driver stability due to it being a relatively rare card.
If you have problems with the driver that ships with
the kernel then you may be interested in the alternative
driver available at:
http://www.cc.hit-u.ac.jp/nagoya/at1700/
The Allied Telesis AT1700 series ethercards are based on the Fujitsu MB86965. This chip uses a programmed I/O interface, and a pair of fixed-size transmit buffers. This allows small groups of packets to be sent back-to-back, with a short pause while switching buffers.
A unique feature is the ability to drive 150ohm STP (Shielded Twisted Pair) cable commonly installed for Token Ring, in addition to 10baseT 100ohm UTP (unshielded twisted pair). A fibre optic version of the card (AT1700FT) exists as well.
The Fujitsu chip used on the AT1700 has a design flaw: it can only be fully reset by doing a power cycle of the machine. Pressing the reset button doesn't reset the bus interface. This wouldn't be so bad, except that it can only be reliably detected when it has been freshly reset. The solution/work-around is to power-cycle the machine if the kernel has a problem detecting the AT1700.
Status: Supported, Driver Name: pcnet32
This is the PCI version of the AT1500, and it doesn't suffer from the problems that the Boca 79c970 PCI card does. DMA selection and chip numbering information can be found in AMD LANCE.
More technical information on AMD LANCE based Ethernet cards can be found in Notes on AMD....
Status: Semi-Supported, Driver Name: rtl8139
This card uses the RealTek 8139 chip - see the section RealTek 8139.
Status: Semi-Supported, Driver Name: eepro100
This card uses the i82557 chip, and hence may/should work with the eepro100 driver. If you try this please send in a report so this information can be updated.
Carl Ching of AMD was kind enough to provide a very detailed description of all the relevant AMD ethernet products which helped clear up this section.
Status: Supported, Driver Name: lance
There really is no AMD ethernet card. You are probably reading this because the only markings you could find on your card said AMD and the above number. The 7990 is the original `LANCE' chip, but most stuff (including this document) refer to all these similar chips as `LANCE' chips. (...incorrectly, I might add.)
These above numbers refer to chips from AMD that are the heart of many ethernet cards. For example, the Allied Telesis AT1500 (see AT1500) and the NE1500/2100 (see NE1500) use these chips.
The 7990/79c90 have long been replaced by newer versions. The 79C960 (a.k.a. PCnet-ISA) essentially contains the 79c90 core, along with all the other hardware support required, which allows a single-chip ethernet solution. The 79c961 (PCnet-ISA+) is a jumperless Plug and Play version of the '960. The final chip in the ISA series is the 79c961A (PCnet-ISA II), which adds full duplex capabilities. All cards with one of these chips should work with the lance.c driver, with the exception of very old cards that used the original 7990 in a shared memory configuration. These old cards can be spotted by the lack of jumpers for a DMA channel.
One common problem people have is the `busmaster arbitration failure' message. This is printed out when the LANCE driver can't get access to the bus after a reasonable amount of time has elapsed (50us). This usually indicates that the motherboard implementation of bus-mastering DMA is broken, or some other device is hogging the bus, or there is a DMA channel conflict. If your BIOS setup has the `GAT option' (for Guaranteed Access Time) then try toggling/altering that setting to see if it helps.
Also note that the driver only looks at the addresses:
0x300, 0x320, 0x340, 0x360 for a valid card, and any
address supplied by an ether= boot argument is silently
ignored (this will be fixed) so make sure your card is configured
for one of the above I/O addresses for now.
The driver will still work fine, even if more than 16MB of memory is installed, since low-memory `bounce-buffers' are used when needed (i.e. any data from above 16MB is copied into a buffer below 16MB before being given to the card to transmit.)
The DMA channel can be set with the low bits of the otherwise-unused dev->mem_start value (a.k.a. PARAM_1). (see PARAM_1) If unset it is probed for by enabling each free DMA channel in turn and checking if initialization succeeds.
The HP-J2405A board is an exception: with this board it's easy to read the EEPROM-set values for the IRQ, and DMA.
See Notes on AMD... for more info on these chips.
Status: Supported, Driver Name: pcnet32
This is the PCnet-32 -- a 32 bit bus-master version of the
original LANCE chip for VL-bus and local bus systems.
chip. While these chips can be operated with the standard
lance.c driver, a 32 bit version (pcnet32.c) is
also available that does not have to concern itself with
any 16MB limitations associated with the ISA bus.
Status: Supported, Driver Name: pcnet32
This is the PCnet-PCI -- similar to the PCnet-32, but designed for PCI bus based systems. Please see the above PCnet-32 information. This means that you need to build a kernel with PCI BIOS support enabled. The '970A adds full duplex support along with some other features to the original '970 design.
Note that the Boca implementation of the 79C970 fails on fast Pentium machines. This is a hardware problem, as it affects DOS users as well. See the Boca section for more details.
Status: Supported, Driver Name: pcnet32
This is AMD's 100Mbit chip for PCI systems, which also supports full duplex operation. It was introduced in June 1996.
Status: Unknown, Driver Name: pcnet32
This should also work just like the '971 but this has yet to be confirmed.
Status: Supported, Driver Name: pcnet32
This is the PCnet-SCSI -- which is basically treated like a '970 from an Ethernet point of view. Also see the above information. Don't ask if the SCSI half of the chip is supported -- this is the Ethernet-HowTo, not the SCSI-HowTo.
Status: Semi-Supported, Driver Name: ac3200
Note that to access this driver during make config
you still have to answer `Y' when asked ``Prompt for
development and/or incomplete code/drivers?'' at
the first. This is simply due to lack of feedback on the
driver stability due to it being a relatively rare card.
This driver is included in the present kernel as an alpha test driver. It is based on the common NS8390 chip used in the ne2000 and wd80x3 cards. Please see Alpha Drivers in this document for important information regarding alpha drivers.
If you use it, let one of us know how things work out, as feedback has been low, even though the driver has been in the kernel since v1.1.25.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Semi-Supported, Driver Name: apricot
This on board ethernet uses an i82596 bus-master chip.
It can only be at I/O address 0x300.
By looking at the driver source,
it appears that the IRQ is also hardwired to 10.
Earlier versions of the driver had a tendency to think
that anything living at 0x300 was an apricot NIC.
Since then the hardware address is checked to avoid these
false detections.
Status: Supported, Driver Name: arcnet (arc-rimi, com90xx, com20020)
With the very low cost and better performance of ethernet, chances are that most places will be giving away their Arcnet hardware for free, resulting in a lot of home systems with Arcnet.
An advantage of Arcnet is that all of the cards have identical interfaces, so one driver will work for everyone. It also has built in error handling so that it supposedly never loses a packet. (Great for UDP traffic!)
Avery Pennarun's arcnet driver has been in the default kernel sources since 1.1.80. The arcnet driver uses `arc0' as its name instead of the usual `eth0' for ethernet devices. Bug reports and success stories can be mailed to:
apenwarr@foxnet.net
There are information files contained in the standard kernel for setting jumpers and general hints.
Supposedly the driver also works with the 100Mbs ARCnet cards as well!
Note that AT&T's StarLAN is an orphaned technology, like SynOptics LattisNet, and can't be used in a standard 10Base-T environment, without a hub that `speaks' both.
Status: Not Supported.
These StarLAN cards use an interface similar to the i82586
chip. At one point, Matthijs Melchior
(matthijs.n.melchior@att.com) was playing with the 3c507
driver, and almost had something useable working. Haven't
heard much since that.
Yes, they make more than just multi-port serial cards. :-)
Status: Supported, Driver Name: lance, pcnet32
These cards are based on AMD's PCnet chips.
Perspective buyers should be warned that many users have had
endless problems with these VLB/PCI cards. Owners of fast Pentium
systems have been especially hit. Note that this is not a driver
problem, as it hits DOS/Win/NT users as well.
Boca's technical support number is (407) 241-8088, and you
can also reach them at 75300.2672@compuserve.com.
The older ISA cards don't appear to suffer the same problems.
Donald did a comparitive test with a Boca PCI card and a similar Allied Telsyn PCnet/PCI implementation, which showed that the problem lies in Boca's implementation of the PCnet/PCI chip. These test results can be accessed on Don's www server.
Boca is offering a `warranty repair' for affected owners, which involves adding one of the missing capacitors, but it appears that this fix doesn't work 100 percent for most people, although it helps some.
If you are still thinking of buying one of these cards, then at least try and get a 7 day unconditional return policy, so that if it doesn't work properly in your system, you can return it.
More general information on the AMD chips can be found in AMD LANCE.
More technical information on AMD LANCE based Ethernet cards can be found in Notes on AMD....
Donald writes: `Yes, another one of these companies that won't release its programming information. They waited for months before actually confirming that all their information was proprietary, deliberately wasting my time. Avoid their cards like the plague if you can. Also note that some people have phoned Cabletron, and have been told things like `a D. Becker is working on a driver for linux' -- making it sound like I work for them. This is NOT the case.'
Apparently Cabletron has changed their policy with respect to
programming information (like Xircom) since Donald made the above
comment several years ago -- send e-mail to support@ctron.com
if you want to verify this or ask for programming information.
However, at this point in time, there is little demand for
modified/updated drivers for the older E20xx and E21xx cards.
Status: Semi-Supported, Driver Name: ne (+8390)
These are NEx000 almost-clones that are reported to work with the standard NEx000 drivers, thanks to a ctron-specific check during the probe. If there are any problems, they are unlikely to be fixed, as the programming information is unavailable.
Status: Semi-Supported, Driver Name: e2100 (+8390)
Again, there is not much one can do when the programming information is proprietary. The E2100 is a poor design. Whenever it maps its shared memory in during a packet transfer, it maps it into the whole 128K region! That means you can't safely use another interrupt-driven shared memory device in that region, including another E2100. It will work most of the time, but every once in a while it will bite you. (Yes, this problem can be avoided by turning off interrupts while transferring packets, but that will almost certainly lose clock ticks.) Also, if you mis-program the board, or halt the machine at just the wrong moment, even the reset button won't bring it back. You will have to turn it off and leave it off for about 30 seconds.
Media selection is automatic, but you can override this
with the low bits of the dev->mem_end parameter.
See
PARAM_2. Module users
can specify an xcvr=N value as an option in
the /etc/conf.modules file.
Also, don't confuse the E2100 for a NE2100 clone. The E2100 is a shared memory NatSemi DP8390 design, roughly similar to a brain-damaged WD8013, whereas the NE2100 (and NE1500) use a bus-mastering AMD LANCE design.
There is an E2100 driver included in the standard kernel. However, seeing as programming info isn't available, don't expect bug-fixes. Don't use one unless you are already stuck with the card.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Semi-Supported, Driver Name: lance
According to information in a Cabletron Tech Bulletin, these cards use the standard AMD PC-Net chipset (see AMD PC-Net) and should work with the generic lance driver.
Here is where and how to reach them:
Cogent Data Technologies, Inc.
175 West Street, P.O. Box 926
Friday Harbour, WA 98250, USA.
Cogent Sales
15375 S.E. 30th Place, Suite 310
Bellevue, WA 98007, USA.
Technical Support:
Phone (360) 378-2929 between 8am and 5pm PST
Fax (360) 378-2882
Compuserve GO COGENT
Bulletin Board Service (360) 378-5405
Internet: support@cogentdata.com
Status: Semi-Supported, Driver Name: smc9194
These cards use the SMC 91c100 chip and may work with the SMC 91c92 driver, but this has yet to be verified.
Status: Supported, Driver Name: de4x5, tulip
These are yet another DEC 21040 implementation that should hopefully work fine with the standard 21040 driver.
The EM400 and the EM964 are four port cards using a DEC 21050 bridge and 4 21040 chips.
See DEC 21040 for more information on these cards, and the present driver situation.
Compaq aren't really in the business of making ethernet cards, but a lot of their systems have embedded ethernet controllers on the motherboard.
Status: Supported, Driver Name: pcnet32
Machines such as the XL series have an AMD 79c97x PCI chip on the mainboard that can be used with the standard LANCE driver. But before you can use it, you have to do some trickery to get the PCI BIOS to a place where Linux can see it. Frank Maas was kind enough to provide the details:
`` The problem with this Compaq machine however is that the PCI directory is loaded in high memory, at a spot where the Linux kernel can't (won't) reach. Result: the card is never detected nor is it usable (sideline: the mouse won't work either) The workaround (as described thoroughly in http://www-c724.uibk.ac.at/XL/) is to load MS-DOS, launch a little driver Compaq wrote and then load the Linux kernel using LOADLIN. Ok, I'll give you time to say `yuck, yuck', but for now this is the only working solution I know of. The little driver simply moves the PCI directory to a place where it is normally stored (and where Linux can find it).''
More general information on the AMD chips can be found in AMD LANCE.
Status: Supported, Driver Name: tlan
These systems use a Texas Instruments ThunderLAN chip Information on the ThunderLAN driver can be found in ThunderLAN.
Status: Supported, Driver Name: de4x5, tulip
Yet another card based on the DEC 21040 chip, reported to work fine, and at a relatively cheap price.
See DEC 21040 for more information on these cards, and the present driver situation.
Status: Supported, Driver Name: ne (+8390)
Some of the early D-Link cards didn't have the 0x57
PROM signature, but the ne2000 driver knows about them.
For the software configurable cards, you can get the
config program from www.dlink.com.
The DE2** cards were the most
widely reported as having the spurious transfer address
mismatch errors with early versions of linux.
Note that there are also cards from
Digital (DEC) that are also named DE100 and DE200,
but the similarity stops there.
Status: Supported, Driver Name: pcnet32
This is a PCI card using the PCI version of AMD's LANCE chip. DMA selection and chip numbering information can be found in AMD LANCE.
More technical information on AMD LANCE based Ethernet cards can be found in Notes on AMD....
Status: Supported, Driver Name: ne, ne2k-pci (+8390)
Apparently D-Link have also started making PCI NE2000 clones.
Status: Supported, Driver Name: de4x5, tulip
This is a generic DEC 21040 PCI chip implementation, and is reported to work with the generic 21040 tulip driver.
See DEC 21040 for more information on these cards, and the present driver situation.
Status: Supported, Driver Name: de600
Laptop users and other folk who might want a quick
way to put their computer onto the ethernet may want
to use this. The driver is included with the default
kernel source tree.
Bjorn Ekwall bj0rn@blox.se wrote the driver.
Expect about 180kb/s transfer speed from this via the
parallel port. You should read the README.DLINK
file in the kernel source tree.
Note that the device name that you pass to ifconfig
is now eth0 and not the previously
used dl0.
If your parallel port is not at the standard 0x378
then you will have to recompile. Bjorn writes:
``Since the DE-620 driver tries to sqeeze the last microsecond
from the loops, I made the irq and port address constants instead
of variables. This makes for a usable speed, but it also means
that you can't change these assignements from e.g. lilo;
you _have_ to recompile...'' Also note that some laptops
implement the on-board parallel port at 0x3bc which
is where the parallel ports on monochrome cards were/are.
Status: Supported, Driver Name: de620
Same as the DE-600, only with two output formats. Bjorn has written a driver for this model, for kernel versions 1.1 and above. See the above information on the DE-600.
Status: Semi-Supported, Driver Name: de650 (?)
Some people have been using this PCMCIA card for some time now with their notebooks. It is a basic 8390 design, much like a NE2000. The LinkSys PCMCIA card and the IC-Card Ethernet are supposedly DE-650 clones as well. Note that at present, this driver is not part of the standard kernel, and so you will have to do some patching.
See PCMCIA Support in this document, and if you can, have a look at:
Status: Supported, Driver Name: ne (+8390)
These cards are now detected (as of 0.99pl15) thanks to
Eberhard Moenkeberg emoenke@gwdg.de who noted that
they use `DFI' in the first 3 bytes of the prom, instead
of using 0x57 in bytes 14 and 15, which is what all the
NE1000 and NE2000 cards use. (The 300 is an 8 bit
pseudo NE1000 clone, and the 400 is a pseudo NE2000 clone.)
Status: Supported, Driver Name: depca
There is documentation included in the source file
`depca.c', which includes info on how to use more than
one of these cards in a machine. Note that the DE422 is
an EISA card. These cards are all based on the AMD LANCE chip.
See
AMD LANCE for more info.
A maximum of two of the ISA cards can be used, because they
can only be set for 0x300 and 0x200 base I/O address.
If you are intending to do this, please read the notes in
the driver source file depca.c in the standard kernel
source tree.
This driver will also work on Alpha CPU based machines, and there are various ioctl()s that the user can play with.
Status: Supported, Driver Name: ewrk3
These cards use a proprietary
chip from DEC, as opposed to the LANCE chip used in the
earlier cards like the DE200. These cards support both shared
memory or programmed I/O, although you take about a 50%performance hit if you use PIO mode. The shared memory size can
be set to 2kB, 32kB or 64kB, but only 2 and 32 have been tested
with this driver. David says that the performance is virtually
identical between the 2kB and 32kB mode. There is more information
(including using the driver as a loadable module) at the top
of the driver file ewrk3.c and also in README.ewrk3.
Both of these files come with the standard kernel distribution.
This driver has Alpha CPU support like depca.c does.
The standard driver has a number of interesting ioctl() calls that can be used to get or clear packet statistics, read/write the EEPROM, change the hardware address, and the like. Hackers can see the source code for more info on that one.
David has also written a configuration utility for this
card (along the lines of the DOS program NICSETUP.EXE)
along with other tools. These can be found on
most Linux FTP sites in the directory
/pub/Linux/system/Network/management -- look for the
file ewrk3tools-X.XX.tar.gz.
Status: Supported, Driver Name: de4x5, tulip
These cards are based on the 21040 chip mentioned below.
The DE500 uses the 21140 chip to provide 10/100Mbs
ethernet connections.
Have a read of the 21040 section below for extra info.
There are also some compile-time options available for
non-DEC cards using this driver. Have a look at
README.de4x5 for details.
All the Digital cards will autoprobe for their media (except, temporarily, the DE500 due to a patent issue).
This driver is also Alpha CPU ready and supports being loaded as a module. Users can access the driver internals through ioctl() calls - see the 'ewrk3' tools and the de4x5.c sources for information about how to do this.
Status: Supported, Driver Name: de4x5, tulip
The DEC 21040 is a bus-mastering single chip ethernet solution from Digital, similar to AMD's PCnet chip. The 21040 is specifically designed for the PCI bus architecture. SMC's new EtherPower PCI card uses this chip.
You have a choice of two drivers for cards based on this chip. There is the DE425 driver discussed above, and the generic 21040 `tulip' driver.
Warning: Even though your card may be based upon this chip, the drivers may not work for you. David C. Davies writes:
``There are no guarantees that either `tulip.c' OR `de4x5.c' will run any DC2114x based card other than those they've been written to support. WHY?? You ask. Because there is a register, the General Purpose Register (CSR12) that (1) in the DC21140A is programmable by each vendor and they all do it differently (2) in the DC21142/3 this is now an SIA control register (a la DC21041). The only small ray of hope is that we can decode the SROM to help set up the driver. However, this is not a guaranteed solution since some vendors (e.g. SMC 9332 card) don't follow the Digital Semiconductor recommended SROM programming format."
In non-technical terms, this means that if you aren't sure that an unknown card with a DC2114x chip will work with the linux driver(s), then make sure you can return the card to the place of purchase before you pay for it.
The updated 21041 chip is also found in place of the 21040
on most of the later SMC EtherPower cards.
The 21140 is for supporting 100Base-? and
works with the Linux drivers for the 21040 chip.
To use David's de4x5 driver with non-DEC cards, have a
look at README.de4x5 for details.
Donald has used SMC EtherPower-10/100 cards to develop the `tulip' driver. Note that the driver that is in the standard kernel tree at the moment is not the most up to date version. If you are having trouble with this driver, you should get the newest version from Donald's ftp/WWW site.
The above URL also contains a (non-exhaustive) list of various cards/vendors that use the 21040 chip.
Also note that the tulip driver is still considered an alpha
driver (see
Alpha Drivers) at the
moment, and should be treated as such. To use it, you
will have to edit arch/i386/config.in and
uncomment the line for CONFIG_DEC_ELCP support.
Donald has even set up a mailing list for tulip driver support announcements, etc. To join it just type:
echo subscribe | /bin/mail
linux-tulip-request@cesdis.gsfc.nasa.gov
Farallon sells EtherWave adaptors and transceivers. This device allows multiple 10baseT devices to be daisy-chained.
Status: Supported, Driver Name: 3c509
This is reported to be a 3c509 clone that includes the EtherWave transceiver. People have used these successfully with Linux and the present 3c509 driver. They are too expensive for general use, but are a great option for special cases. Hublet prices start at $125, and Etherwave adds $75-$100 to the price of the board -- worth it if you have pulled one wire too few, but not if you are two network drops short.
Unlike many network chip manufacturers, Fujitsu have also made and sold some network cards based upon their chip.
Status: Supported, Driver Name: fmv18x
According to the driver, these cards are a straight forward Fujitsu MB86965 implementation, which would make them very similar to the Allied Telesis AT1700 cards.
The 272** cards use programmed I/O, similar to the NE*000 boards, but the data transfer port can be `turned off' when you aren't accessing it, avoiding problems with autoprobing drivers.
Thanks to Glenn Talbott for helping clean up the confusion in this section regarding the version numbers of the HP hardware.
Status: Supported, Driver Name: hp (+8390)
8 Bit 8390 based 10BaseT, not recommended for all the 8 bit reasons. It was re-designed a couple years ago to be highly integrated which caused some changes in initialization timing which only affected testing programs, not LAN drivers. (The new card is not `ready' as soon after switching into and out of loopback mode.)
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Supported, Driver Name: hp+ (+8390)
The HP PC Lan+ is different to the standard HP PC Lan card. This driver was added to the list of drivers in the standard kernel during the v1.1.x development cycle. It can be operated in either a PIO mode like a ne2000, or a shared memory mode like a wd8013.
The 47B is a 16 Bit 8390 based 10BaseT w/AUI, and the 52A is a 16 Bit 8390 based ThinLAN w/AUI. These cards have 32K onboard RAM for Tx/Rx packet buffering instead of the usual 16KB, and they both offer LAN connector autosense.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Supported, Driver Name: lance
These are lower priced, and slightly faster than the 27247/27252A, but are missing some features, such as AUI, ThinLAN connectivity, and boot PROM socket. This is a fairly generic LANCE design, but a minor design decision makes it incompatible with a generic `NE2100' driver. Special support for it (including reading the DMA channel from the board) is included thanks to information provided by HP's Glenn Talbott.
More technical information on LANCE based cards can be found in Notes on AMD...
Status: Supported, Driver Name: lance
The HP-Vectra has an AMD PCnet chip on the motherboard. DMA selection and chip numbering information can be found in AMD LANCE.
More technical information on LANCE based cards can be found in Notes on AMD...
Status: Supported, Driver Name: hp100
This driver also supports some of the Compex VG products.
Since the driver supports ISA, EISA and PCI cards, it
is found under ISA cards when running make config
on a kernel source.
Status: Supported, Driver Name: eepro100
Apparently these are just a rebadged Intel EtherExpress Pro 10/100B card. See the Intel section for more information.
Status: Supported, Driver Name: znet
This is compatible with the Intel based Zenith Z-note. See Z-note for more info.
Supposedly this site has a comprehensive database of useful stuff for newer versions of the Thinkpad. I haven't checked it out myself yet.
For those without a WWW browser handy, try
peipa.essex.ac.uk:/pub/tp750/
Status: Semi-Supported, Driver Name: ? (distributed separately)
People have been using this PCMCIA card with Linux as well. Similar points apply, those being that you need a supported PCMCIA chipset on your notebook, and that you will have to patch the PCMCIA support into the standard kernel.
See PCMCIA Support in this document, and if you can, have a look at:
Status: Semi-Supported, Driver Name: ibmtr
To support token ring requires more than only writing a device driver, it also requires writing the source routing routines for token ring. It is the source routing that would be the most time comsuming to write.
Peter De Schrijver has been spending some time on Token Ring lately. and has worked with IBM ISA and MCA token ring cards.
The present token ring code has been included into the first of the 1.3.x series kernels.
Peter says that it was originally tested on an MCA 16/4 Megabit Token Ring board, but it should work with other Tropic based boards.
Status: Supported, Driver Name: eth16i
Mika Kuoppala (miku@pupu.elt.icl.fi) wrote this driver, and it was included into early 1.3.4x kernels. It uses the Fujitsu MB86965 chip that is also used on the at1700 cards.
Note that the naming of the various Intel cards is ambiguous
and confusing at best. If in doubt, then check the i8xxxx
number on the main chip on the card or for PCI cards, use the
PCI information in the /proc directory and then
compare that to the numbers listed here.
Status: Supported, Driver Name: eexpress
This card uses the intel i82586. Earlier versions of this driver (in v1.2 kernels) were classed as alpha-test, as it didn't work well for most people. The driver in the v2.0 kernel seems to work much better for those who have tried it, although the driver source still lists it as experimental and more problematic on faster machines.
The comments at the top of the
driver source list some of the problems (and fixes!) associated
with these cards. The slowdown hack of replacing all the outb
with outb_p in the driver has been reported to avoid lockups
for at least one user.
Status: Supported, Driver Name: eepro
Bao Chau Ha has written a driver for these cards that has been included into early 1.3.x kernels. It may also work with some of the Compaq built-in ethernet systems that are based on the i82595 chip.
Status: Semi-Supported, Driver Name: ? (distributed separately)
John Stalba (stalba@ultranet.com) has written a driver for the PCI version. These cards use the PLX9036 PCI interface chip with the Intel i82596 LAN controller chip. If your card has the i82557 chip, then you don't have this card, but rather the version discussed next, and hence want the EEPro100 driver instead.
You can get the alpha driver for the PRO/10 PCI card, along with instructions on how to use it at:
If you have the EISA card, you will probably have to hack the driver a bit to account for the different (PCI vs. EISA) detection mechanisms that are used in each case.
Status: Supported, Driver Name: eepro100
Note that this driver will not work with the older 100A cards. The chip numbers listed in the driver are i82557/i82558. For driver updates and/or driver support, have a look at:
To subscribe to the mailing list relating to this driver, do:
echo subscribe | /bin/mail
linux-eepro100-request@cesdis.gsfc.nasa.gov
Apparently Donald had to sign a non-disclosure agreement that stated he could actually disclose the driver source code! How is that for sillyness on intel's part?
Kingston make various cards, including NE2000+, AMD PCnet based cards, and DEC tulip based cards. Most of these cards should work fine with their respective driver. See Kingston Web Page
The KNE40 DEC 21041 tulip based card is reported to work fine with the generic tulip driver.
LinkSys make a handful of different NE2000 clones, some straight ISA cards, some ISA plug and play and some even ne2000-PCI clones based on one of the supported ne2000-PCI chipsets. There are just too many models to list here.
LinkSys are linux-friendly, with a linux specific WWW support page, and even have Linux printed on the boxes of some of their products. Have a look at:
http://www.linksys.com/support/solution/nos/linux.htm
Status: Supported, Driver Name: tulip
Note that with these cards there have been several `revisions' (i.e. different chipset used) all with the same card name. The 1st used the DEC chipset. The 2nd revision used the Lite-On PNIC 82c168 PCI Network Interface Controller, and support for this was merged into the standard tulip driver (as of version 0.83 and newer). More PNIC information is available at:
http://cesdis.gsfc.nasa.gov/linux/drivers/pnic.html
More information on the various versions of these cards can be found at the LinkSys WWW site mentioned above.
Status: Supported, Driver Name: de620
This is supposedly a DE-620 clone, and is reported to work well with that driver. See DE-620 for more information.
Status: Supported, Driver Name: de650 (?)
This is supposed to be a re-badged DE-650. See DE-650 for more information.
Status: Semi-Supported, Driver Name: ?
Another i82586 based card. Dirk Niggemann
dirk-n@dircon.co.uk
has written a driver that he classes as ``pre-alpha''
that he would like people to test. Mail him for more details.
Mylex can be reached at the following numbers, in case anyone wants to ask them anything.
MYLEX CORPORATION, Fremont
Sales: 800-77-MYLEX, (510) 796-6100
FAX: (510) 745-8016.
They also have a web site: Mylex WWW Site
Status: Supported, Driver Name: lne390 (+8390)
These are fairly old EISA cards that make use of a shared memory implementation similar to the wd80x3. A driver for these cards is available in the current 2.1.x series of kernels. Ensure you set the shared memory address below 1MB or above the highest address of the physical RAM installed in the machine.
Status: Supported, Driver Name: de4x5, tulip
This is a PCI card that is based on DEC's 21040 chip. It is selectable between 10BaseT, 10Base2 and 10Base5 output. The LNP101 card has been verified to work with the generic 21040 driver.
See the section on the 21040 chip ( DEC 21040) for more information.
Status: Semi-Supported, Driver Name: de4x5, tulip
The LNP104 uses the DEC 21050 chip to deliver four independent 10BaseT ports. It should work with recent 21040 drivers that know how to share IRQs, but nobody has reported trying it yet (that I am aware of).
The prefix `NE' came from Novell Ethernet. Novell followed the cheapest NatSemi databook design and sold the manufacturing rights (spun off?) Eagle, just to get reasonably-priced ethercards into the market. (The now ubiquitous NE2000 card.)
Status: Supported, Driver Name: ne (+8390)
The ne2000 is now a generic name for a bare-bones design around the NatSemi 8390 chip. They use programmed I/O rather than shared memory, leading to easier installation but slightly lower performance and a few problems. Some of the more common problems that arise with NE2000 cards are listed in Problems with...
Some NE2000 clones use the National Semiconductor `AT/LANTic' 83905 chip, which offers a shared memory mode similar to the wd8013 and EEPROM software configuration. The shared memory mode will offer less CPU usage (i.e. more efficient) than the programmed I/O mode.
In general it is not a good idea to put a NE2000
clone at I/O address 0x300 because nearly
every device driver probes there at boot. Some
poor NE2000 clones don't take kindly to being prodded
in the wrong areas, and will respond by locking your
machine. Also 0x320 is bad because SCSI drivers
probe into 0x330.
Donald has written a NE2000 diagnostic program (ne2k.c) for all ne2000 cards. See Diagnostic Programs for more information.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Supported, Driver Name: ne, ne2k-pci (+8390)
Yes, believe it or not, people are making PCI cards based on the more than ten year old interface design of the ne2000. At the moment nearly all of these cards are based on the RealTek 8029 chip, or the Winbond 89c940 chip. The Compex, KTI, VIA and Netvin cards apparently also use these chips, but have a different PCI ID.
The latest v2.0 kernel has support to automatically detect all
these cards and use them. (If you are using a kernel v2.0.34 or
older, you should upgrade to ensure your card will be detected.)
There are now two drivers to choose from; the original ISA/PCI
ne.c driver, and a relatively new PCI-only ne2k-pci.c
driver.
To use the original ISA/PCI driver you have to say `Y' to
the `Other ISA cards' option when running make config as
you are actually using the same NE2000 driver as the ISA cards
use. (That should also give you a hint that these cards aren't
anywhere as intelligent as say a PCNet-PCI or DEC 21040 card...)
The newer PCI-only driver differs from the ISA/PCI driver in that all the support for old NE1000 8 bit cards has been removed and that data is moved to/from the card in bigger blocks, without any intervening pauses that the older ISA-NE2000's required for reliable operation. The result is a driver that is slightly smaller and slightly more efficient, but don't get too excited as the difference will not be obvious under normal use. (If you really wanted maximum efficiency/low CPU use, then a PCI-NE2000 is simply a very poor choice.) Driver updates and more information can be found at:
http://cesdis.gsfc.nasa.gov/linux/drivers/ne2k-pci.html
If you have a NE2000 PCI card that is not detected by
the most current version of the driver, please contact the
maintainer of the NE2000 driver as listed
in /usr/src/linux/MAINTAINERS along with the output
from a cat /proc/pci and dmesg so that
support for your card can also be added to the driver.
Also note that various card makers have been known to put `NE2000 Compatible' stickers on their product boxes even when it is completely different (e.g. PCNet-PCI or RealTek 8139). If in doubt check the main chip number against this document.
Status: Not Supported.
These are ISA 100Mbps cards based on the National Semiconductor DP83800 and DP83840 chips. There is currently no driver support, nor has anyone reported that they are working on a driver. Apparently documentation on the chip is unavailable with the exception of a single PDF file that doesn't give enough details for a driver.
Status: Supported, Driver Name: lance
These cards use the original 7990 LANCE chip from AMD and are supported using the Linux lance driver. Newer NE2100 clones use the updated PCnet/ISA chip from AMD.
Some earlier versions of the lance driver had problems with getting the IRQ line via autoIRQ from the original Novell/Eagle 7990 cards. Hopefully this is now fixed. If not, then specify the IRQ via LILO, and let us know that it still has problems.
DMA selection and chip numbering information can be found in AMD LANCE.
More technical information on LANCE based cards can be found in Notes on AMD...
Status: Semi-Supported, Driver Name: ne2
There were a few NE2000 microchannel cards made by various companies. This driver, available in v2.2 kernels, will detect the following MCA cards: Novell Ethernet Adapter NE/2, Compex ENET-16 MC/P, and the Arco Ethernet Adapter AE/2.
Status: Not Supported.
This old EISA card uses a 8MHz 80186 in conjunction with an i82586. Nobody is working on a driver for it, as there is no information available on the card, and no real demand for a driver either.
Status: Supported, Driver Name: ne3210 (+8390)
This EISA card is completely different from the NE3200, as it uses a Nat Semi 8390 chip. The driver can be found in the v2.2 kernel source tree. Ensure you set the shared memory address below 1MB or above the highest address of the physical RAM installed in the machine.
Status: Supported, Driver Name: pcnet32
These are just AMD PCnet-PCI cards ('970A) chips. More information on LANCE/PCnet based cards can be found in AMD LANCE.
Status: Supported, Driver Name: ne (+8390)
Apparently this is a NE2000 clone, and works fine with Linux.
Status: Supported, Driver Name: de4x5, tulip
This is yet another PCI card that is based on DEC's Tulip chip. It has been reported to work fine with Linux.
See the section on the 21040 chip ( DEC 21040) for more driver information.
Status: Supported, Driver Name: wd (+8390)
The PureData PDUC8028 and PDI8023 series of cards are reported
to work, thanks to special probe code contributed by Mike
Jagdis jaggy@purplet.demon.co.uk. The support is integrated
with the WD driver.
Racal Interlan can be reached via WWW at
www.interlan.com. I believe they were also known as
MiCom-Interlan at one point in the past.
Status: Semi-Supported, Driver Name: es3210
This is an EISA 8390 based shared memory card. An experimetal
driver is shipped with v2.2 kernels and it is reported to
work fine, but the EISA IRQ and shared memory address detection
appears not to work with (at least) the early revision cards.
(This problem is not unique to the Linux world either...)
In that case, you have to supply them to the driver.
For example, card at IRQ 5 and shared memory 0xd0000,
with a modular driver, add
options es3210 irq=5 mem=0xd0000 to /etc/conf.modules.
Or with the driver compiled into the kernel, supply at
boot ether=5,0,0xd0000,eth0
The I/O base is automatically detected
and hence a value of zero should be used.
Status: Semi-Supported, Driver Name: ni5010
You used to have to go get the driver for these old 8 bit MiCom-Interlan cards separately, but now it is shipped with the v2.2 kernels as an experimental driver.
Status: Semi-Supported, Driver Name: ni52
This card also uses one of the Intel chips. Michael Hipp has written a driver for this card. It is included in the standard kernel as an `alpha' driver. Michael would like to hear feedback from users that have this card. See Alpha Drivers for important information on using alpha-test ethernet drivers with Linux.
Status: Semi-Supported, Driver Name: ni65
There is also a driver for the LANCE based NI6510, and it is also written by Michael Hipp. Again, it is also an `alpha' driver. For some reason, this card is not compatible with the generic LANCE driver. See Alpha Drivers for important information on using alpha-test ethernet drivers with Linux.
Status: Supported, Driver Name: lance
As of kernel 1.3.23, the generic LANCE driver had a check
added to it for the 0x52, 0x44 NI6510EB specific signature.
Others have reported that this signature is not the same
for all NI6510EB cards however, which will cause the lance
driver to not detect your card. If this happens to you, you
can change the probe (at about line 322 in lance.c) to printk()
out what the values are for your card and then use them instead
of the 0x52, 0x44 defaults.
The cards should probably be run in `high-performance' mode and not in the NI6510 compatible mode when using the lance driver.
Status: Supported, Driver Name: atp
This is a generic, low-cost OEM pocket adaptor being sold by AT-Lan-Tec, and (likely) a number of other suppliers. A driver for it is included in the standard kernel. Note that there is substantial information contained in the driver source file `atp.c'.
Note that the device name that you pass to ifconfig
was not eth0 but atp0 for earlier versions
of this driver.
Status: Supported, Driver Name: ne (+8390)
This is an ISA NE2000 clone, and is reported to work fine with
the linux NE2000 driver.
The rset8009.exe program can be obtained from RealTek's
WWW site at http://www.realtek.com.tw - or via ftp
from the same site.
Status: Supported, Driver Name: ne (+8390)
This is a Plug and Pray version of the above. Use the DOS
software to disable PnP and enable jumperless configuration;
set the card to a sensible I/O address and IRQ and you should
be ready to go. (If using the driver as a module, don't forget
to add an io=0xNNN option to /etc/conf.modules).
The rset8019.exe program can be obtained from RealTek's
WWW site at http://www.realtek.com.tw - or via ftp
from the same site.
Status: Supported, Driver Name: ne, ne2k-pci (+8390)
This is a PCI single chip implementation of a NE2000 clone. Various vendors are now selling cards with this chip. See NE2000-PCI for information on using any of these cards. Note that this is still a 10+ year old design just glued onto a PCI bus. Performance won't be staggeringly better than the equivalent ISA model.
Status: Semi-Supported, Driver Name: rtl8139
Another PCI single chip ethernet solution from RealTek. A driver for cards based upon this chip was included in the v2.0.34 release of linux. You currently have to answer `Y' when asked if you want experimental drivers for v2.2 kernels to get access to this driver. For more information, see:
http://cesdis.gsfc.nasa.gov/linux/drivers/rtl8139.html
Status: Semi-Supported, Driver Name: 3c501
This is just a 3c501 clone, with a different S.A. PROM prefix. I assume it is equally as brain dead as the original 3c501 as well. The driver checks for the NP943 I.D. and then just treats it as a 3c501 after that. See 3Com 3c501 for all the reasons as to why you really don't want to use one of these cards.
Status: Supported, Driver Name: sk_g16
This driver was included into the v1.1 kernels, and it was written by PJD Weichmann and SWS Bern. It appears that the SK G16 is similar to the NI6510, in that it is based on the first edition LANCE chip (the 7990). Once again, it appears as though this card won't work with the generic LANCE driver.
Status: Supported, Driver Name: seeq8005
This driver was included into early 1.3.x kernels, and was written by Hamish Coleman. There is little information about the card included in the driver, and hence little information to be put here. If you have a question, you are probably best off e-mailing hamish@zot.apana.org.au
The ethernet part of Western Digital was bought out by SMC many years ago when the wd8003 and wd8013 were the main product. Since then SMC has continued making 8390 based ISA cards (Elite16, Ultra, EtherEZ) and also added several PCI products to their range.
Contact information for SMC:
SMC / Standard Microsystems Corp., 80 Arkay Drive, Hauppage, New York,
11788, USA. Technical Support via phone: 800-992-4762 (USA) or
800-433-5345 (Canada) or 516-435-6250 (Other Countries).
Literature requests: 800-SMC-4-YOU (USA) or 800-833-4-SMC (Canada)
or 516-435-6255 (Other Countries). Technical Support via E-mail:
techsupt@ccmail.west.smc.com. FTP Site: ftp.smc.com.
WWW Site:
SMC.
Status: Supported, Driver Name: wd (+8390)
These are the 8-bit versions of the card. The
8 bit 8003 is slightly less expensive, but only
worth the savings for light use. Note that some
of the non-EEPROM cards (clones with jumpers, or
old old old wd8003 cards) have no way of reporting
the IRQ line used. In this case, auto-irq is used, and if
that fails, the driver silently assings IRQ 5.
You can get the SMC setup/driver disks from SMC's ftp site.
Note that some of the
newer SMC `SuperDisk' programs will fail to detect
the real old EEPROM-less cards. The file SMCDSK46.EXE
seems to be a good all-round choice. Also the jumper
settings for all their cards are in an ASCII text file in the
aforementioned archive. The latest (greatest?) version
can be obtained from ftp.smc.com.
As these are basically the same as their 16 bit counterparts (WD8013 / SMC Elite16), you should see the next section for more information.
Status: Supported, Driver Name: wd (+8390)
Over the years the design has added more registers and an EEPROM. (The first wd8003 cards appeared about ten years ago!) Clones usually go by the `8013' name, and usually use a non-EEPROM (jumpered) design. Late model SMC cards will have the SMC 83c690 chip instead of the original Nat Semi DP8390 found on earlier cards. The shared memory design makes the cards a bit faster than PIO cards, especially with larger packets. More importantly, from the driver's point of view, it avoids a few bugs in the programmed-I/O mode of the 8390, allows safe multi-threaded access to the packet buffer, and it doesn't have a programmed-I/O data register that hangs your machine during warm-boot probes.
Non-EEPROM cards that can't just read the selected IRQ will attempt auto-irq, and if that fails, they will silently assign IRQ 10. (8 bit versions will assign IRQ 5)
Cards with a non standard amount of memory on board can
have the memory size specified at boot (or as an option
in /etc/conf.modules if using modules).
The standard memory size is
8kB for an 8bit card and 16kB for a 16bit card.
For example, the older WD8003EBT cards could be jumpered
for 32kB memory. To make full use of that RAM, you would
use something like (for I/O=0x280 and IRQ 9):
LILO: linux ether=9,0x280,0xd0000,0xd8000,eth0
Also see 8013 problems for some of the more common problems and frequently asked questions that pop up often.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Supported, Driver Name: smc-ultra (+8390)
This ethercard is based on the 83c790 chip from SMC, which has a few new features over the 83c690. While it has a mode that is similar to the older SMC ethercards, it's not entirely compatible with the old WD80*3 drivers. However, in this mode it shares most of its code with the other 8390 drivers, while operating slightly faster than a WD8013 clone.
Since part of the Ultra looks like an 8013, the Ultra probe is supposed to find an Ultra before the wd8013 probe has a chance to mistakenly identify it.
Donald mentioned that it is possible to write a separate driver for the Ultra's `Altego' mode which allows chaining transmits at the cost of inefficient use of receive buffers, but that will probably not happen.
Bus-Master SCSI host adaptor users take note: In the manual that ships with Interactive UNIX, it mentions that a bug in the SMC Ultra will cause data corruption with SCSI disks being run from an aha-154X host adaptor. This will probably bite aha-154X compatible cards, such as the BusLogic boards, and the AMI-FastDisk SCSI host adaptors as well.
SMC has acknowledged the problem occurs with
Interactive, and older Windows NT drivers. It is
a hardware conflict with early revisions of the card
that can be worked around in the driver design. The current
Ultra driver protects against this by only enabling the
shared memory during data transfers with the card. Make sure
your kernel version is at least 1.1.84, or that the driver
version reported at boot is at least smc-ultra.c:v1.12
otherwise you are vulnerable.
If you intend on using this driver as a loadable module you should probably see Using the Ethernet Drivers as Modules for module specific information.
Status: Supported, Driver Name: smc-ultra32 (+8390)
This EISA card shares a lot in common with its ISA counterpart. A working (and stable) driver is included in both v2.0 and v2.2 kernels. Thanks go to Leonard Zubkoff for purchasing some of these cards so that linux support could be added for them.
Status: Supported, Driver Name: smc-ultra (+8390)
This card uses SMC's 83c795 chip and supports the Plug 'n Play specification. It also has an SMC Ultra compatible mode, which allows it to be used with the Linux Ultra driver. For best results, use the SMC supplied program (avail. from their www/ftp site) to disable PnP and configure it for shared memory mode. See the above information for notes on the Ultra driver.
For v1.2 kernels, the card had to be configured for shared memory operation. However v2.0 kernels can use the card in shared memory or programmed I/O mode. Shared memory mode will be slightly faster, and use less CPU resources as well.
Status: Supported, Driver Name: de4x5, tulip
NB: The EtherPower II is an entirely different card. See
below!
These cards are
a basic DEC 21040 implementation, i.e. one big chip
and a couple of transceivers. Donald has used one
of these cards for his development of the generic
21040 driver (aka tulip.c). Thanks to Duke Kamstra,
once again, for supplying a card to do development on.
Some of the later revisons of this card use the newer DEC 21041 chip, which may cause problems with older versions of the tulip driver. If you have problems, make sure you are using the latest driver release, which may not yet be included in the current kernel source tree.
See DEC 21040 for more details on using one of these cards, and the current status of the driver.
Apparently, the latest revision of the card, the EtherPower-II uses the 9432 chip. It is unclear at the moment if this one will work with the present driver. As always, if unsure, check that you can return the card if it doesn't work with the linux driver before paying for the card.
Status: Semi-Supported, Driver Name: epic100
These cards, based upon the SMC 83c170 chip, are entirely different than the Tulip based cards. A new driver has been included in kernels v2.0 and v2.2 to support these cards. For more details, see:
http://cesdis.gsfc.nasa.gov/linux/drivers/epic100.html
Status: Not Supported.
These 8 bit cards are based on the Fujitsu MB86950, which is an ancient version of the MB86965 used in the Linux at1700 driver. Russ says that you could probably hack up a driver by looking at the at1700.c code and his DOS packet driver for the Tiara card (tiara.asm). They are not very common.
Status: Not Supported.
These are 16bit I/O mapped 8390 cards, much similar to a generic NE2000 card. If you can get the specifications from SMC, then porting the NE2000 driver would probably be quite easy. They are not very common.
Status: Supported, Driver Name: smc9194
The SMC9000 is a VLB card based on the 91c92 chip. The 91c92 appears on a few other brand cards as well, but is fairly uncommon. Erik Stahlman (erik@vt.edu) has written this driver which is in v2.0 kernels, but not in the older v1.2 kernels. You may be able to drop the driver into a v1.2 kernel source tree with minimal difficulty.
Status: Semi-Supported, Driver Name: smc9194
The SMC 91c92 driver is supposed to work for cards based on this 100Base-T chip, but at the moment this is unverified.
Status: Supported, Driver Name: tlan
This driver covers many Compaq built-in ethernet devices, including the NetFlex and Netelligent groups. It also supports the Olicom 2183, 2185, 2325 and 2326 products.
This is yet another PCI card that is based on DEC's 21040 chip.
See the section on the 21040 chip ( DEC 21040) for more information.
You probably won't see a VIA networking card, as VIA make several networking chips that are then used by others in the construction of an ethernet card. They have a WWW site at:
http://www.via.com.tw/
Status: Supported, Driver Name: ne, ne2k-pci (+8390)
This controller chip is VIA's PCI-NE2000 offering. You
can choose between the ISA/PCI ne.c driver or
the PCI-only ne2k-pci.c driver. See the PCI-NE2000
section for more details.
Status Supported, Driver Name: via-rhine
This relatively new driver can be found in current 2.0 and 2.1 kernels. It is an improvement over the 86C926 NE2000 chip in that it supports bus master transfers, but strict 32 bit buffer alignment requirements limit the benefit gained from this. For more details and driver updates, see:
http://cesdis.gsfc.nasa.gov/linux/drivers/via-rhine.html
Please see SMC for information on SMC cards. (SMC bought out Western Digital's network card section many years ago.)
Winbond don't really make and sell complete cards to the general public -- instead they make single chip ethernet solutions that other companies buy, stick onto a PCI board with their own name and then sell through retail stores.
Status: Semi-Supported, Driver Name: winbond-840
This driver isn't currently shipped with the kernel, as it is in the testing phase. It is available at:
http://cesdis.gsfc.nasa.gov/linux/drivers/test/winbond-840.c
Status: Supported, Driver Name: ne, ne2k-pci (+8390)
This chip is one of the two commonly found on the low price PCI ne2000 cards sold by lots of manufacturers. Note that this is still a 10+ year old design just glued onto a PCI bus. Performance won't be staggeringly better than the equivalent ISA model.
For the longest time, Xircom wouldn't release the programming information required to write a driver, unless you signed your life away. Apparently enough linux users have pestered them for driver support (they claim to support all popular networking operating systems...) so that they have changed their policy to allow documentation to be released without having to sign a non-disclosure agreement. Some people have said they they will release the source code to the SCO driver, while others have been told that they are no longer providing information on `obsolete' products like the earlier PE models. If you are interested and want to check into this yourself, you can reach Xircom at 1-800-874-7875, 1-800-438-4526 or +1-818-878-7600.
Status: Not Supported.
Not to get your hopes up, but if you have one of these parallel port adaptors, you may be able to use it in the DOS emulator with the Xircom-supplied DOS drivers. You will have to allow DOSEMU access to your parallel port, and will probably have to play with SIG (DOSEMU's Silly Interrupt Generator).
Status: Semi-Supported, Driver Name: ????
Some of the Xircom PCMCIA card(s) have drivers that are available with David Hinds PCMCIA package. Check there for the most up to date indformation
Status: Supported, Driver Name: znet
The built-in Z-Note network adaptor is based on the Intel
i82593 using two DMA channels. There is an (alpha?) driver
available in the present kernel version. As with all notebook
and pocket adaptors, it is under the `Pocket and portable
adaptors' section when running make config.
Also note that the IBM ThinkPad 300 is compatible with the Z-Note.
Status: Supported, Driver Name: de4x5, tulip
You have a choice of two drivers for cards based on this chip. There is the DE425 driver written by David, and the generic 21040 driver that Donald has written.
Note that as of 1.1.91, David has added a compile time option that
may allow non-DEC cards (such as the Znyx cards) to work with
this driver. Have a look at README.de4x5 for details.
See DEC 21040 for more information on these cards, and the present driver situation.
Okay, so your uncle's cousin's neighbour's friend had a brother who found an old ISA ethernet card in the AT case he was using as a cage for his son's pet hampster. Somehow you ended up with the card and want to try and use it with linux, but nobody has a clue what the card is and there isn't any documentation.
First of all, look for any obvious model numbers that might give a clue. Any model number that contains 2000 will most likely be a NE2000 clone. Any cards with 8003 or 8013 on them somewhere will be Western/Digital WD80x3 cards or SMC Elite cards or clones of them.
Look for the biggest chip on the card. This will be the network controller (NIC) itself, and most can be identified by the part number. If you know which NIC is on the card, the following might be able to help you figure out what card it is.
Probably still the most common NIC is the National Semiconductor DP8390 aka NS32490 aka DP83901 aka DP83902 aka DP83905 aka DP83907. And those are just the ones made by National! Other companies such as Winbond and UMC make DP8390 and DP83905 clone parts, such as the Winbond 89c904 (DP83905 clone) and the UMC 9090. If the card has some form of 8390 on it, then chances are it is a ne1000 or ne2000 clone card. The second most common 8390 based card are wd80x3 cards and clones. Cards with a DP83905 can be configured to be an ne2000 or a wd8013. Never versions of the genuine wd80x3 and SMC Elite cards have an 83c690 in place of the original DP8390. The SMC Ultra cards have an 83c790, and use a slightly different driver than the wd80x3 cards. The SMC EtherEZ cards have an 83c795, and use the same driver as the SMC Ultra. All BNC cards based on some sort of 8390 or 8390 clone will usually have an 8392 (or 83c692, or ???392) 16 pin DIP chip very close to the BNC connector.
Another common NIC found on older cards is the Intel i82586. Cards having this NIC include the 3c505, 3c507, 3c523, Intel EtherExpress-ISA, Microdyne Exos-205T, and the Racal-Interlan NI5210.
The original AMD LANCE NIC was numbered AM7990, and newer revisions include the 79c960, 79c961, 79c965, 79c970, and 79c974. Most cards with one of the above will work with the Linux LANCE driver, with the exception of the old Racal-Interlan NI6510 cards that have their own driver.
Newer PCI cards having a DEC 21040, 21041, 21140, or similar number on the NIC should be able to use the linux tulip or de4x5 driver.
Other PCI cards having a big chip marked RTL8029 or 89C940 or 86C926 are ne2000 clone cards, and the ne driver in linux version v2.0 and up should automatically detect these cards at boot.
Each ethernet card has its own six byte address that is
unique to that card. The first three bytes of that address
are the same for each card made by that particular manufacturer.
For example all SMC cards start with 00:00:c0.
The last three are assigned by the manufacturer uniquely to each
individual card as they are produced.
If your card has a sticker on it giving all six bits of its address, you can look up the vendor from the first three. However it is more common to see only the last three bytes printed onto a sticker attached to a socketed PROM, which tells you nothing.
You can determine which vendors have which assigned addresses
from RFC-1340. Apparently there is a more up to date listing
available in various places as well. Try a WWW or FTP search
for EtherNet-codes or Ethernet-codes and you will
find something.
If you are still not sure what the card is, but have at least narrowed it down some, then you can build a kernel with a whole bunch of drivers included, and see if any of them autodetect the card at boot.
If the kernel doesn't detect the card, it may be that the
card is not configured to one of the addresses that the
driver probes when looking for a card. In this case, you
might want to try getting scanport.tar.gz from your
local linux ftp site, and see if that can locate where your
card is jumpered for. It scans ISA I/O space from 0x100
to 0x3ff looking for devices that aren't registered in
/proc/ioports. If it finds an unknown device starting
at some particular address, you can then explicity point the
ethernet probes at that address with an ether= boot
argument.
If you manage to get the card detected, you can then usually figure out the unknown jumpers by changing them one at a time and seeing at what I/O base and IRQ that the card is detected at. The IRQ settings can also usually be determined by following the traces on the back of the card to where the jumpers are soldered through. Counting the `gold fingers' on the backside, from the end of the card with the metal bracket, you have IRQ 9, 7, 6, 5, 4, 3, 10, 11, 12, 15, 14 at fingers 4, 21, 22, 23, 24, 25, 34, 35, 36, 37, 38 respectively. Eight bit cards only have up to finger 31.
Jumpers that appear to do nothing usually are for selecting the memory address of an optional boot ROM. Other jumpers that are located near the BNC or RJ-45 or AUI connectors are usually to select the output media. These are also typically near the `black box' voltage converters marked YCL, Valor, or Fil-Mag.
A nice collection of jumper settings for various cards can be found at the following URL:
There are a few other drivers that are in the linux source that present an ethernet-like device to network programs, while not really being ethernet. These are briefly listed here for completeness.
dummy.c - The purpose of this driver is to provide a device
to point a route through, but not to actually transmit packets.
eql.c - Load Equalizer, enslaves multiple devices (usually
modems) and balances the Tx load across them while presenting
a single device to the network programs.
ibmtr.c - IBM Token Ring, which is not really ethernet.
Broken-Ring requires source routing and other uglies.
loopback.c - Loopback device, for which all packets
from your machine and destined for your own machine go.
It essentially just moves the packet off the Tx queue and
onto the Rx queue.
pi2.c - Ottawa Amateur Radio Club PI and PI2 interface.
plip.c - Parallel Line Internet Protocol, allows two
computers to send packets to each other over two joined
parallel ports in a point-to-point fashion.
ppp.c - Point-to-Point Protocol (RFC1331), for the
Transmission of Multi-protocol Datagrams over a
Point-to-Point Link (again usually modems).
slip.c - Serial Line Internet Protocol, allows two
computers to send packets to each other over two joined
serial ports (usually via modems) in a point-to-point fashion.
tunnel.c - Provides an IP tunnel through which you can
tunnel network traffic transparently across subnets
wavelan.c - An Ethernet-like radio transceiver
controlled by the Intel 82586 coprocessor which is used on
other ethercards such as the Intel EtherExpress.
If you are starting a network from scratch, you will have to decide whether to use thin ethernet (RG58 co-ax cable with BNC connectors) or 10baseT (twisted pair telco-style cables with RJ-45 eight wire `phone' connectors). The old-fashioned thick ethernet, RG-5 cable with N connectors is obsolete and rarely seen anymore.
See
Type of cable... for
an introductory look at cables.
Also note that the FAQ from comp.dcom.lans.ethernet has a lot
of useful information on cables and such. FTP to
rtfm.mit.edu and look in /pub/usenet-by-hierarchy/
for the FAQ for that newsgroup.
Thin ethernet cable is pretty inexpensive. If you are making your own cables solid-core RG58A is $0.27/m. and stranded RG58AU is $0.45/m. Twist-on BNC connectors are < $2 ea., and other misc. pieces are similarly inexpensive. It is essential that you properly terminate each end of the cable with 50 ohm terminators, so budget $2 ea. for a pair. It's also vital that your cable have no `stubs' -- the `T' connectors must be attached directly to the ethercards.
There are two main drawbacks to using thinnet. The first is that it is limited to 10Mb/sec - 100Mb/sec requires twisted pair. The second drawback is that if you have a big loop of machines connected together, and some bonehead breaks the loop by taking one cable off the side of his tee, the whole network goes down because it sees an infinite impedance (open circuit) instead of the required 50 ohm termination. Note that you can remove the tee piece from the card itself without killing the whole subnet, as long as you don't remove the cables from the tee itself. Of course this will disturb the machine that you pull the actual tee off of. 8-) And if you are doing a small network of two machines, you still need the tees and the 50 ohm terminators -- you can't just cable them together!
There are also some fancy cable systems which look like a single lead going to the card, but the lead is actually two runs of cable laying side-by-side covered by an outer sheath, giving the lead an oval shaped cross-section. At the turnaround point of the loop, a BNC connector is spliced in which connects to your card. So you have the equivalent of two runs of cable and a BNC T, but in this case, it is impossible for the user to remove a cable from one side of the T and disturb the network.
Twisted pair networks require active hubs, which start around $50, and the raw cable cost can actually be higher than thinnet. You can pretty much ignore claims that you can use your existing telephone wiring as it is a rare installation where that turns out to be the case.
On the other hand, all 100Mb/sec ethernet proposals use twisted pair, and most new business installations use twisted pair. Also, Russ Nelson adds that `New installations should use Category 5 wiring. Anything else is a waste of your installer's time, as 100Base-whatever is going to require Cat 5.'
If you are only connecting two machines, it is possible to avoid using a hub, by swapping the Rx and Tx pairs (1-2 and 3-6).
If you hold the RJ-45 connector facing you (as if you were going to plug it into your mouth) with the lock tab on the top, then the pins are numbered 1 to 8 from left to right. The pin usage is as follows:
Pin Number Assignment
---------- ----------
1 Output Data (+)
2 Output Data (-)
3 Input Data (+)
4 Reserved for Telephone use
5 Reserved for Telephone use
6 Input Data (-)
7 Reserved for Telephone use
8 Reserved for Telephone use
If you want to make a cable, the following should spell it out for you. Differential signal pairs must be on the same twisted pair to get the required minimal impedance/loss of a UTP cable. If you look at the above table, you will see that 1+2 and 3+6 are the two sets of differential signal pairs. Not 1+3 and 2+6 !!!!!! At 10MHz, with short lengths, you *may* get away with such errors, if it is only over a short length. Don't even think about it at 100MHz.
For a normal patch cord, with ends `A' and `B', you want straight through pin-to-pin mapping, with the input and output each using a pair of twisted wires (for impedance issues). That means 1A goes to 1B, 2A goes to 2B, 3A goes to 3B and 6A goes to 6B. The wires joining 1A-1B and 2A-2B must be a twisted pair. Also the wires joining 3A-3B and 6A-6B must be another twisted pair.
Now if you don't have a hub, and want to make a `null cable', what you want to do is make the input of `A' be the output of `B' and the output of `A' be the input of `B', without changing the polarity. Tha means connecting 1A to 3B (out+ A to in+ B) and 2A to 6B (out- A to in- B). These two wires must be a twisted pair. They carry what card/plug `A' considers output, and what is seen as input for card/plug `B'. Then connect 3A to 1B (in+ A to out+ B) and also connect 6A to 2B (in- A to out- B). These second two must also be a twisted pair. They carry what card/plug `A' considers input, and what card/plug `B' considers output.
So, if you consider a normal patch cord, chop one end off of it, swap the places of the Rx and Tx twisted pairs into the new plug, and crimp it down, you then have a `null' cable. Nothing complicated. You just want to feed the Tx signal of one card into the Rx of the second and vice versa.
Note that before 10BaseT was ratified as a standard, there existed other network formats using RJ-45 connectors, and the same wiring scheme as above. Examples are SynOptics's LattisNet, and AT&T's StarLAN. In some cases, (as with early 3C503 cards) you could set jumpers to get the card to talk to hubs of different types, but in most cases cards designed for these older types of networks will not work with standard 10BaseT networks/hubs. (Note that if the cards also have an AUI port, then there is no reason as to why you can't use that, combined with an AUI to 10BaseT transceiver.)
Thick ethernet is mostly obsolete, and is usually used only to remain compatible with an existing implementation. You can stretch the rules and connect short spans of thick and thin ethernet together with a passive $3 N-to-BNC connector, and that's often the best solution to expanding an existing thicknet. A correct (but expensive) solution is to use a repeater in this case.
In most cases, if the configuration is done by software, and stored in an EEPROM, you will usually have to boot DOS, and use the vendor supplied DOS program to set the cards IRQ, I/O, mem_addr and whatnot. Besides, hopefully it is something you will only be setting once. If you don't have the DOS software for your card, try looking on the WWW site of your card manufacturer. If you don't know the site name, take a guess at it, i.e. `www.my_vendor.com' where `my_vendor' is the name of your card manufacturer. This works for SMC, 3Com, and many many other manufacturers.
There are some cards for which Linux versions of
the config utils exist, and they are listed here.
Donald has written a few small card diagnostic
programs that run under Linux. Most of these are a result
of debugging tools that he has created while writing the
various drivers. Don't expect
fancy menu-driven interfaces. You will have to read the
source code to use most of these. Even if your particular
card doesn't have a corresponding diagnostic, you can
still get some information just by typing
cat /proc/net/dev -- assuming that your card
was at least detected at boot.
In either case, you will have to run most of these programs
as root (to allow I/O to the ports) and you probably want
to shut down the ethercard before doing so by typing
ifconfig eth0 down first.
For people with wd80x3 cards, there is the program wdsetup
which can be found in wdsetup-0.6a.tar.gz on Linux ftp sites.
It is not being actively maintained, and has
not been updated for quite a while. If it works fine for you
then great, if not, use the DOS version that you should have got
with your card. If you don't have the DOS version, you will be
glad to know that the SMC setup/driver disks are available
at SMC's ftp site.
Of course, you have to have an EEPROM card to use this utility.
Old, old wd8003 cards, and some wd8013 clones use jumpers
to set up the card instead.
The Digital EtherWorks 3 card can be configured in a similar
fashion to the DOS program NICSETUP.EXE. David C. Davies
wrote this and other tools for the EtherWorks 3 in conjunction
with the driver. Look on you local linux FTP site in the directory
/pub/linux/system/Network/management for the file
that is named ewrk3tools-X.XX.tar.gz.
Some Nat Semi DP83905 implementations (such as the AT/LANTIC
and the NE2000+) are software configurable. (Note that these
cards can also emulate a wd8013 card!) You can get the file
/pub/linux/setup/atlantic.c from Donald's ftp
server, cesdis.gsfc.nasa.gov to configure this card.
In addition, the configuration programs for the Kingston
DP83905 cards seem to work with all cards, as they don't
check for a vendor specific address before allowing you to
use them. Follow the following URL:
Kingston Software
and get 20XX12.EXE and INFOSET.EXE.
Be careful when configuring NE2000+ cards, as you can give them bad setting values which can cause problems. A typical example is accidentally enabling the boot ROM in the EEPROM (even if no ROM is installed) to a setting that conflicts with the VGA card. The result is a computer that just beeps at you when you turn it on and nothing appears on the screen.
You can typically
recover from this by doing the following: Remove the card
from the machine, and then boot and enter the CMOS setup.
Change the `Display Adapter' to `Not Installed' and change
the default boot drive to `A:' (your floppy drive).
Also change the `Wait for F1 if any Error' to `Disabled'.
This way, the computer should boot without user intervention.
Now create a bootable DOS floppy (`format a: /s /u') and copy
the program default.exe from the 20XX12.EXE archive
above onto that floppy. Then
type echo default > a:autoexec.bat
so that the program to set the card back to sane defaults will
be run automatically when you boot from this floppy.
Shut the machine off, re-install the ne2000+ card, insert your
new boot floppy, and power it back up. It will still probably beep
at you, but eventually you should see the floppy light come on
as it boots from the floppy. Wait a minute or two for the floppy
to stop, indicating that it has finished running the default.exe
program, and then power down your computer. When you then turn it
on again, you should hopefully have a working display again,
allowing you to change your CMOS settings back, and to change
the card's EEPROM settings back to the values you want.
Note that if you don't have DOS handy, you can do the whole
method above with a linux boot disk that automatically runs
Donald's atlantic program (with the right command line
switches) instead of a DOS boot disk that automatically runs
the default.exe program.
The 3Com Etherlink III family of cards (i.e. 3c5x9) can
be configured by using another config utility from Donald.
You can get the file /pub/linux/setup/3c5x9setup.c
from Donald's ftp server, cesdis.gsfc.nasa.gov to
configure these cards. (Note that the DOS 3c5x9B config
utility may have more options pertaining to the new ``B''
series of the Etherlink III family.)
Any of the diagnostic programs that Donald has written can be obtained from this URL.
Allied Telesis AT1700 -- look for the file
/pub/linux/diag/at1700.c on cesdis.gsfc.nasa.gov.
Cabletron E21XX -- look for the file
/pub/linux/diag/e21.c on cesdis.gsfc.nasa.gov.
HP PCLAN+ -- look for the file
/pub/linux/diag/hp+.c on cesdis.gsfc.nasa.gov.
Intel EtherExpress -- look for the file
/pub/linux/diag/eexpress.c on cesdis.gsfc.nasa.gov.
NE2000 cards -- look for the file
/pub/linux/diag/ne2k.c on cesdis.gsfc.nasa.gov.
There is also a PCI version for the now common NE2000-PCI clones.
RealTek (ATP) Pocket adaptor -- look for the file
/pub/linux/diag/atp-diag.c on cesdis.gsfc.nasa.gov.
All Other Cards -- try typing cat /proc/net/dev and
dmesg to see what useful info the kernel has on the
card in question.
For those who want to understand a bit more about how the card works, or play with the present drivers, or even try to make up their own driver for a card that is presently unsupported, this information should be useful. If you do not fall into this category, then perhaps you will want to skip this section.
If you can already send and receive back-to-back packets, you just can't put more bits over the wire. Every modern ethercard can receive back-to-back packets. The Linux DP8390 drivers (wd80x3, SMC-Ultra, 3c503, ne2000, etc) come pretty close to sending back-to-back packets (depending on the current interrupt latency) and the 3c509 and AT1500 hardware have no problem at all automatically sending back-to-back packets.
The ISA bus can do 5.3MB/sec (42Mb/sec), which sounds like more than enough for 10Mbps ethernet. In the case of the 100Mbps cards, you clearly need a faster bus to take advantage of the network bandwidth.
Pro: Doesn't use any constrained system resources, just a few I/O registers, and has no 16M limit.
Con: Usually the slowest transfer rate, the CPU is waiting the whole time, and interleaved packet access is usually difficult to impossible.
Pro: Simple, faster than programmed I/O, and allows random access to packets. Where possible, the linux drivers compute the checksum of incoming IP packets as they are copied off the card, resulting in a further reduction of CPU usage vs. an equivalent PIO card.
Con: Uses up memory space (a big one for DOS users, essentially a non-issue under Linux), and it still ties up the CPU.
Pro: Frees up the CPU during the actual data transfer.
Con: Checking boundary conditions, allocating contiguous buffers, and programming the DMA registers makes it the slowest of all techniques. It also uses up a scarce DMA channel, and requires aligned low memory buffers.
Pro: Frees up the CPU during the data transfer, can string together buffers, can require little or no CPU time lost on the ISA bus. Most of the bus-mastering linux drivers now use a `copybreak' scheme where large packets are put directly into a kernel networking buffer by the card, and small packets are copied by the CPU which primes the cache for subsequent processing.
Con: (Only applicable to ISA bus cards) Requires low-memory buffers and a DMA channel for cards. Any bus-master will have problems with other bus-masters that are bus-hogs, such as some primitive SCSI adaptors. A few badly-designed motherboard chipsets have problems with bus-masters. And a reason for not using any type of DMA device is using a 486 processor designed for plug-in replacement of a 386: these processors must flush their cache with each DMA cycle. (This includes the Cx486DLC, Ti486DLC, Cx486SLC, Ti486SLC, etc.)
The only thing that one needs to use an ethernet card with Linux is the appropriate driver. For this, it is essential that the manufacturer will release the technical programming information to the general public without you (or anyone) having to sign your life away. A good guide for the likelihood of getting documentation (or, if you aren't writing code, the likelihood that someone else will write that driver you really, really need) is the availability of the Crynwr (nee Clarkson) packet driver. Russ Nelson runs this operation, and has been very helpful in supporting the development of drivers for Linux. Net-surfers can try this URL to look up Russ' software.
Given the documentation, you can write a driver for your card and use it for Linux (at least in theory). Keep in mind that some old hardware that was designed for XT type machines will not function very well in a multitasking environment such as Linux. Use of these will lead to major problems if your network sees a reasonable amount of traffic.
Most cards come with drivers for MS-DOS interfaces such as NDIS and ODI, but these are useless for Linux. Many people have suggested directly linking them in or automatic translation, but this is nearly impossible. The MS-DOS drivers expect to be in 16 bit mode and hook into `software interrupts', both incompatible with the Linux kernel. This incompatibility is actually a feature, as some Linux drivers are considerably better than their MS-DOS counterparts. The `8390' series drivers, for instance, use ping-pong transmit buffers, which are only now being introduced in the MS-DOS world.
(Ping-pong Tx buffers means using at least 2 max-size packet buffers for Tx packets. One is loaded while the card is transmitting the other. The second is then sent as soon as the first finished, and so on. In this way, most cards are able to continuously send back-to-back packets onto the wire.)
OK. So you have decided that you want to write a driver for the Foobar Ethernet card, as you have the programming information, and it hasn't been done yet. (...these are the two main requirements ;-) You should start with the skeleton network driver that is provided with the Linux kernel source tree. It can be found in the file /usr/src/linux/drivers/net/skeleton.c in all recent kernels. Also have a look at the Kernel Hackers Guide, at the following URL: KHG
Here are some notes on the functions that you would have to write if creating a new driver. Reading this in conjunction with the above skeleton driver may help clear things up.
Called at boot to check for existence of card. Best if it can check un-obtrsively by reading from memory, etc. Can also read from I/O ports. Initial writing to I/O ports in a probe is not good as it may kill another device. Some device initialization is usually done here (allocating I/O space, IRQs,filling in the dev->??? fields etc.) You need to know what io ports/mem the card can be configured to, how to enable shared memory (if used) and how to select/enable interrupt generation, etc.
Called by the kernel when the card posts an interrupt. This has the job of determining why the card posted an interrupt, and acting accordingly. Usual interrupt conditions are data to be rec'd, transmit completed, error conditions being reported. You need to know any relevant interrupt status bits so that you can act accordingly.
Linked to dev->hard_start_xmit() and is called by the
kernel when there is some data that the kernel wants
to put out over the device. This puts the data onto
the card and triggers the transmit. You need to
know how to bundle the data and how to get it onto the
card (shared memory copy, PIO transfer, DMA?) and in
the right place on the card. Then you need to know
how to tell the card to send the data down the wire, and
(possibly) post an interrupt when done.
When the hardware can't accept additional packets it should set
the dev->tbusy flag. When additional room is available, usually
during a transmit-complete interrupt, dev->tbusy should be cleared
and the higher levels informed with mark_bh(INET_BH).
Called by the kernel interrupt handler when the card reports that there is data on the card. It pulls the data off the card, packages it into a sk_buff and lets the kernel know the data is there for it by doing a netif_rx(sk_buff). You need to know how to enable interrupt generation upon Rx of data, how to check any relevant Rx status bits, and how to get that data off the card (again sh mem, PIO, DMA, etc.)
linked to dev->open and called by the networking layers
when somebody does ifconfig eth0 up - this
puts the device on line and enables it for Rx/Tx of
data. Any special initialization incantations that were
not done in the probe sequence (enabling IRQ generation, etc.)
would go in here.
This puts the card in a sane state when someone
does ifconfig eth0 down.
It should free the IRQs and DMA channels if the hardware permits,
and turn off anything that will save power (like the transceiver).
Things like a reset function, so that if things go south, the driver can try resetting the card as a last ditch effort. Usually done when a Tx times out or similar. Also a function to read the statistics registers of the card if so equipped.
If you are interested in working on drivers for 3Com cards, you can get technical documentation from 3Com. Cameron has been kind enough to tell us how to go about it below:
3Com's Ethernet Adapters are documented for driver writers in our `Technical References' (TRs). These manuals describe the programmer interfaces to the boards but they don't talk about the diagnostics, installation programs, etc that end users can see.
The Network Adapter Division marketing department has the TRs to give away. To keep this program efficient, we centralized it in a thing called `CardFacts.' CardFacts is an automated phone system. You call it with a touch-tone phone and it faxes you stuff. To get a TR, call CardFacts at 408-727-7021. Ask it for Developer's Order Form, document number 9070. Have your fax number ready when you call. Fill out the order form and fax it to 408-764-5004. Manuals are shipped by Federal Express 2nd Day Service.
There are people here who think we are too free with the manuals, and they are looking for evidence that the system is too expensive, or takes too much time and effort. So far, 3Com customers have been really good about this, and there's no problem with the level of requests we've been getting. We need your continued cooperation and restraint to keep it that way.
The AMD LANCE (Local Area Network Controller for Ethernet) was the original offering, and has since been replaced by the `PCnet-ISA' chip, otherwise known as the 79C960. Note that the name `LANCE' has stuck, and some people will refer to the new chip by the old name. Dave Roberts of the Network Products Division of AMD was kind enough to contribute the following information regarding this chip:
`Functionally, it is equivalent to a NE1500. The register set is identical to the old LANCE with the 1500/2100 architecture additions. Older 1500/2100 drivers will work on the PCnet-ISA. The NE1500 and NE2100 architecture is basically the same. Initially Novell called it the 2100, but then tried to distinguish between coax and 10BASE-T cards. Anything that was 10BASE-T only was to be numbered in the 1500 range. That's the only difference.
Many companies offer PCnet-ISA based products, including HP, Racal-Datacom, Allied Telesis, Boca Research, Kingston Technology, etc. The cards are basically the same except that some manufacturers have added `jumperless' features that allow the card to be configured in software. Most have not. AMD offers a standard design package for a card that uses the PCnet-ISA and many manufacturers use our design without change. What this means is that anybody who wants to write drivers for most PCnet-ISA based cards can just get the data-sheet from AMD. Call our literature distribution center at (800)222-9323 and ask for the Am79C960, PCnet-ISA data sheet. It's free.
A quick way to understand whether the card is a `stock' card is to just look at it. If it's stock, it should just have one large chip on it, a crystal, a small IEEE address PROM, possibly a socket for a boot ROM, and a connector (1, 2, or 3, depending on the media options offered). Note that if it's a coax card, it will have some transceiver stuff built onto it as well, but that should be near the connector and away from the PCnet-ISA.'
A note to would-be card hackers is that different LANCE implementations do `restart' in different ways. Some pick up where they left off in the ring, and others start right from the beginning of the ring, as if just initialised.
Another one of the things Donald has worked on is implementing multicast and promiscuous mode hooks. All of the released (i.e. not ALPHA) ISA drivers now support promiscuous mode.
Donald writes: `I'll start by discussing promiscuous mode, which is conceptually easy to implement. For most hardware you only have to set a register bit, and from then on you get every packet on the wire. Well, it's almost that easy; for some hardware you have to shut the board (potentially dropping a few packet), reconfigure it, and then re-enable the ethercard. OK, so that's easy, so I'll move on something that's not quite so obvious: Multicast. It can be done two ways:
I guess I should list what a few ethercards/chips provide:
Chip/card Promiscuous Multicast filter
----------------------------------------
Seeq8001/3c501 Yes Binary filter (1)
3Com/3c509 Yes Binary filter (1)
8390 Yes Autodin II six bit hash (2) (3)
LANCE Yes Autodin II six bit hash (2) (3)
i82586 Yes Hidden Autodin II six bit hash (2) (4)
Note that none of these chips do perfect filtering, and we still need a middle-level module to do the final filtering. Also note that in every case we must keep a complete list of accepted multicast addresses to recompute the hash table when it changes.
The general idea of the developers is that the BPF functionality should not be provided by the kernel, but should be in a (hopefully little-used) compatibility library.
For those not in the know: BPF (the Berkeley Packet Filter) is an mechanism for specifying to the kernel networking layers what packets you are interested in. It's implemented as a specialized stack language interpreter built into a low level of the networking code. An application passes a program written in this language to the kernel, and the kernel runs the program on each incoming packet. If the kernel has multiple BPF applications, each program is run on each packet.
The problem is that it's difficult to deduce what kind of packets the application is really interested in from the packet filter program, so the general solution is to always run the filter. Imagine a program that registers a BPF program to pick up a low data-rate stream sent to a multicast address. Most ethernet cards have a hardware multicast address filter implemented as a 64 entry hash table that ignores most unwanted multicast packets, so the capability exists to make this a very inexpensive operation. But with the BPF the kernel must switch the interface to promiscuous mode, receive _all_ packets, and run them through this filter. This is work, BTW, that's very difficult to account back to the process requesting the packets.
There are several ways to put your laptop on a network. You can use the SLIP code (and run at serial line speeds); you can get a notebook with a supported PCMCIA slot built-in; you can get a laptop with a docking station and plug in an ISA ethercard; or you can use a parallel port Ethernet adapter.
This is the cheapest solution, but by far the most difficult. Also, you will not get very high transmission rates. Since SLIP is not really related to ethernet cards, it will not be discussed further here. See the NET-2 Howto.
Try and determine exactly what hardware you have (ie. card manufacturer, PCMCIA chip controller manufacturer) and then ask on the LAPTOPS channel. Regardless, don't expect things to be all that simple. Expect to have to fiddle around a bit, and patch kernels, etc. Maybe someday you will be able to type `make config' 8-)
At present, the two PCMCIA chipsets that are supported are the Databook TCIC/2 and the intel i82365.
There is a number of programs on tsx-11.mit.edu in /pub/linux/packages/laptops/ that you may find useful. These range from PCMCIA Ethercard drivers to programs that communicate with the PCMCIA controller chip. Note that these drivers are usually tied to a specific PCMCIA chip (ie. the intel 82365 or the TCIC/2)
For NE2000 compatible cards, some people have had success
with just configuring the card under DOS, and then booting
linux from the DOS command prompt via loadlin.
Things are looking up for Linux users that want PCMCIA support, as substantial progress is being made. Pioneering this effort is David Hinds. His latest PCMCIA support package can be obtained from:
Look for a file like
pcmcia-cs-X.Y.Z.tgz where X.Y.Z will be the latest version
number. This is most likely uploaded to the tsx-11.mit.edu
FTP site as well.
Note that Donald's PCMCIA enabler works as a user-level process, and David Hinds' is a kernel-level solution. You may be best served by David's package as it is much more widely used and under continuous development.
Docking stations for laptops typically cost about $250 and provide two full-size ISA slots, two serial and one parallel port. Most docking stations are powered off of the laptop's batteries, and a few allow adding extra batteries in the docking station if you use short ISA cards. You can add an inexpensive ethercard and enjoy full-speed ethernet performance.
The `pocket' ethernet adaptors may also fit your need. Note that the transfer speed will not be all that great (perhaps 200kB/s tops?) due to the limitations of the parallel port interface.
Also most tie you down with a wall-brick power supply. You can sometimes avoid the wall-brick with the adaptors by buying or making a cable that draws power from the laptop's keyboard port. (See keyboard power)
See DE-600 / DE-620 and RealTek for two supported pocket adaptors.
Any other associated stuff that didn't fit in anywhere else gets dumped here. It may not be relevant, and it may not be of general interest but it is here anyway.
Here are two generic kernel commands that can be passed to
the kernel at boot time (ether and reserve).
This can be done with LILO, loadlin,
or any other booting utility that accepts optional arguments.
For example, if the command was `blah' and it expected 3 arguments (say 123, 456, and 789) then, with LILO, you would use:
LILO: linux blah=123,456,789
For more information on (and a complete list of) boot time arguments, please see the BootPrompt-HOWTO
ether command
The ether= argument is used in conjunction with
drivers that are directly built into the kernel. The
ether= argument will have absolutely no effect
on a modular driver. In its most generic form, it
looks something like this:
ether=IRQ,BASE_ADDR,PARAM_1,PARAM_2,NAME
All arguments are optional. The first non-numeric argument is taken as the NAME.
IRQ: Obvious. An IRQ value of `0' (usually the default) means to autoIRQ. It's a historical accident that the IRQ setting is first rather than the base_addr -- this will be fixed whenever something else changes.
BASE_ADDR: Also obvious. A value of `0' (usually the default) means to probe a card-type-specific address list for an ethercard.
PARAM_1: It was orginally used as an override value for the memory start for a shared-memory ethercard, like the WD80*3. Some drivers use the low four bits of this value to set the debug message level. 0 -- default, 1-7 -- level 1..7, (7 is maximum verbosity) 8 -- level 0 (no messages). Also, the LANCE driver uses the low four bits of this value to select the DMA channel. Otherwise it uses auto-DMA.
PARAM_2: The 3c503 driver uses this to select between the internal and external transceivers. 0 -- default/internal, 1 -- AUI external. The Cabletron E21XX card also uses the low 4 bits of PARAM_2 to select the output media. Otherwise it detects automatically.
NAME: Selects the network device the values refer to. The standard kernel uses the names `eth0', `eth1', `eth2' and `eth3' for bus-attached ethercards, and `atp0' for the parallel port `pocket' ethernet adaptor. The arcnet driver uses `arc0' as its name. The default setting is for a single ethercard to be probed for as `eth0'. Multiple cards can only be enabled by explicitly setting up their base address using these LILO parameters. The 1.0 kernel has LANCE-based ethercards as a special case. LILO arguments are ignored, and LANCE cards are always assigned `eth<n>' names starting at `eth0'. Additional non-LANCE ethercards must be explicitly assigned to `eth<n+1>', and the usual `eth0' probe disabled with something like `ether=0,-1,eth0'. ( Yes, this is bug. )
reserve command
This next lilo command is used just like `ether=' above, ie. it is appended to the name of the boot select specified in lilo.conf
reserve=IO-base,extent{,IO-base,extent...}
In some machines it may be necessary to prevent device drivers from checking for devices (auto-probing) in a specific region. This may be because of poorly designed hardware that causes the boot to freeze (such as some ethercards), hardware that is mistakenly identified, hardware whose state is changed by an earlier probe, or merely hardware you don't want the kernel to initialize.
The reserve boot-time argument addresses this problem by specifying
an I/O port region that shouldn't be probed. That region is reserved
in the kernel's port registration table as if a device has already
been found in that region. Note that this mechanism shouldn't be
necessary on most machines. Only when there is a problem or special
case would it be necessary to use this.
The I/O ports in the specified region are protected against
device probes. This was put in to be used when some driver was
hanging on a NE2000, or misidentifying some other device
as its own. A correct device driver shouldn't probe a reserved
region, unless another boot argument explicitly specifies that
it do so. This implies that reserve will most often be used
with some other boot argument. Hence if you specify a reserve
region to protect a specific device, you must generally specify
an explicit probe for that device. Most drivers ignore the port
registration table if they are given an explicit address.
For example, the boot line
LILO: linux reserve=0x300,32 ether=0,0x300,eth0
keeps all device drivers except the ethercard drivers from probing 0x300-0x31f.
As usual with boot-time specifiers there is an 11 parameter limit,
thus you can only specify 5 reserved regions per reserve keyword.
Multiple reserve specifiers will work if you have an unusually
complicated request.
Most of the linux distributions now ship kernels that have
very few drivers built-in. The drivers are instead supplied as
a bunch of independent dynamically loadable modules. These
modular drivers are typically loaded by the administrator
with the modprobe(8) command, or in some cases they are
automatically loaded by the kernel through `kerneld' (in
2.0) or `kmod' (in 2.1) which then calls modprobe.
You particular distribution may offer nice graphical configuration tools for setting up ethernet modules. If possible you should try and use them first. The description that follows here gives information on what underlies any fancy configuration program, and what these programs change.
The information that controls what modules are to be used and
what options are supplied to each module is usually stored in
the file /etc/conf.modules. The two main options of
interest (for ethernet cards) that will be used in this file
are alias and options. The modprobe command
consults this file for module information.
The actual modules themselves are typically stored in a directory
named /lib/modules/`uname -r`/net where the
uname -r command gives the kernel version (e.g. 2.0.34).
You can look in there to see which module matches your card.
The first thing you need in your conf.modules file is
something to tell modprobe what driver to use for the
eth0 (and eth1 and...) network interface. You
use the alias command for this. For example, if you
have an ISA SMC EtherEZ card which uses the smc-ultra.o
driver module, you need to alias this driver to eth0
by adding the line:
alias eth0 smc-ultra
The other thing you may need is an options line indicating
what options are to be used with a particular module (or module
alias). Continuing with the above example, if you only used the
single alias line with no options line, the kernel would
warn you (see dmesg) that autoprobing for ISA cards is not
a good idea. To get rid of this warning, you would add another
line telling the module what I/O base the card is configured to,
in this case say the hexidecimal address 0x280 for example.
options smc-ultra io=0x280
Most ISA modules accept parameters like io=0x340 and
irq=12 on the insmod command line. It is REQUIRED
or at least STRONGLY ADVISED that you supply these parameters
to avoid probing for the card. Unlike PCI and EISA devices,
there is no real safe way to do auto-probing for most ISA devices,
and so it should be avoided when using drivers as modules.
A list of all the options that each module accepts can be found in the file:
/usr/src/linux/Documentation/networking/net-modules.txt
It is recommended that you read that to find out what options you can use for your particular card. Note that some modules support comma separated value lists for modules that have the capability to handle multiple devices from a single module, such as all the 8390 based drivers, and the PLIP driver. For exmple:
options 3c503 io=0x280,0x300,0x330,0x350 xcvr=0,1,0,1
The above would have the one module controlling four 3c503 cards, with card 2 and 4 using external transcievers. Don't put spaces around the `=' or commas.
Also note that a busy module can't be removed. That means
that you will have to ifconfig eth0 down (shut down the
ethernet card) before you can remove the module(s).
The command lsmod will show you what modules are
loaded, whether they are in use, and rmmod will remove them.
Much of this info came from saved postings from the comp.os.linux groups, which shows that it is a valuable resource of information. Other useful information came from a bunch of small files by Donald himself. Of course, if you are setting up an Ethernet card, then you will want to read the NET-2 Howto so that you can actually configure the software you will use. Also, if you fancy yourself as a bit of a hacker, you can always scrounge some additional info from the driver source files as well. There is usually a paragraph or two in there describing any important points before any actual code starts..
For those looking for information that is not specific in any way
to Linux (i.e. what is 10BaseT, what is AUI, what does a hub do, etc.)
I strongly recommend making use of the newsgroup comp.dcom.lans.ethernet
and/or comp.sys.ibm.pc.hardware.networking. Newsgroup archives
such as those at dejanews.com can also be an invaluable source
of information.
You can grab the newsgroup FAQ from RTFM (which holds all the newsgroup
FAQs) at the following URL:
You can also have a look at the `Ethernet-HomePage' so to speak, which is at the following URL:
This document is not gospel. However, it is probably the most up to date info that you will be able to find. Nobody is responsible for what happens to your hardware but yourself. If your ethercard or any other hardware goes up in smoke (...nearly impossible!) we take no responsibility. ie. THE AUTHORS ARE NOT RESPONSIBLE FOR ANY DAMAGES INCURRED DUE TO ACTIONS TAKEN BASED ON THE INFORMATION INCLUDED IN THIS DOCUMENT.
This document is Copyright (c) 1993-1997 by Paul Gortmaker. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies.
Permission is granted to copy and distribute modified versions of this document under the conditions for verbatim copying, provided that this copyright notice is included exactly as in the original, and that the entire resulting derived work is distributed under the terms of a permission notice identical to this one.
Permission is granted to copy and distribute translations of this document into another language, under the above conditions for modified versions.
A hint to people considering doing a translation. First,
translate the SGML source (available via FTP from the HowTo
main site) so that you can then generate other output formats.
Be sure to keep a copy of the original English SGML source that
you translated from! When an updated HowTo is released,
get the new SGML source for that version, and then a simple
diff -u old.sgml new.sgml will show you exactly what has
changed so that you can easily incorporate those changes into
your translated SMGL source without having to re-read or
re-translate everything.
If you are intending to incorporate this document into a published work, please make contact (via e-mail) so that you can be supplied with the most up to date information available. In the past, out of date versions of the Linux HowTo documents have been published, which caused the developers undue grief from being plagued with questions that were already answered in the up to date versions.
If you have found any glaring typos, or outdated info in this document, please send an e-mail. It is big, and it is easy to overlook stuff. If you have e-mailed about a change, and it hasn't been included in the next version, please don't hesitate to send it again, as it might have got lost amongst the usual sea of SPAM and junk mail I get.
Thanks!
Paul Gortmaker, p_gortmaker@yahoo.com