Re: ethernet driver

[<Ale...@ne...>]

Franck -

I am also working towards an IP-over-1394 implementation together with streaming
multimedia on the same time.  Please update me on your progress if you can.

I am working with two OHCI cards in my Linux box, interconnected by a cable and
also connected to a data transit bus analyzer.  My OHCI driver is not the latest
but works flawlessly (more or less).  To Linux each card seems like a standalone
1394  node, so I am able to pass read/write messages between the cards.  You
should try it too.

Alex.




Sebastien Rougeaux <Seb...@sy...> on 05/02/2000 06:03:23
AM

Please respond to Seb...@sy...

Sent by:  Sebastien Rougeaux <Seb...@sy...>


To:   fra...@ya...
cc:   lin...@li... (Alexander Carmeli/US/3Com)
Subject:  Re: ethernet driver




Good to hear that IP over 1394 is progressing ;-)

>>>>> "Franck" == =?iso-8859-1?q?Franck=20Bonin?=  <iso-8859-1> writes:

Franck> Since few weeks, I write an encapsuted ethernet driver on the top of
Franck> the linux ieee1394 subsystem. By using the old 0.5 version of modules
Franck> with 2 adaptec boards : Hot Connect 8920, I was able to transfer data
Franck> twice as fast as on common ethernet interface. But, I found some
Franck> problems using the linux ieee1394 subsystem.

Franck> First, I was not able to find a way to transfer data using ``unified''
Franck> write transactions. So I make few modifications in the ieee1394 core
Franck> module.

Franck> The Hot Connect 8920 board use S200 speed bus. So the max payload data
Franck> on a single paquet must be 1024 bytes. But, to avoid kernel freezing,
Franck> I reduce the size of ethernet paquet to 200 bytes. If not, after some
Franck> times, strangness append in the low level driver ``aic5800'', this
Franck> could freeze the 2 computers.

I think the AIC5800 is not supported anymore... it's been a few months since
the last update for this driver has been announced.

Franck> ----------

Franck> Last week, I recieved 2 ADS PYRO OHCI boards. So I download last CVS
Franck> version of modules and libraw. After succesfull installation and
Franck> tests, I rebuild my ethernet driver, using the new subsystem. And
Franck> unfortunatly I found other strange problems.

Franck> 1. ``insmoding'' 2 times the ohci modules freezing one or the other
Franck> computer...

I have not experienced any kernel freeze when loading the ohci module
for quite a while now, and nobody else so far as complained about that
on the list... however the ohci driver is still very much alpha quality and
has not been extensively tested, so anything is possible. Could you
please be more specific with your bug report. Can you repeat the kernel
freeze easily ? Can you get part of the log file before it happens ?

Franck> 2. My ethernet driver is working (vor exemple, flood ping is OK) but
Franck> other kind of programs like ftp or telnet don't work well: for an
Franck> unknown reason, after a few time, the ohci driver (or the board ?)
Franck> stop recieve (or transmit) paquets, while it still can transmit (or
Franck> receive) some other paquets like ARP ones. And of course, some times
Franck> it crach !

When the ohci driver stops receiving packets, could you please make a dump
of 'dmesg' and 'cat /proc/ohci1394'... Is this error repeatable as well ?
Don't forget to turn on the 'excessive debugging messages' option.

Franck> ___________

Franck> An other question :

Franck> Now, I will work on isochronous transmissions and video stream. But
Franck> unfortunatly, I have not any camrecorder. So does anyone know the way
Franck> to make believe others nodes that my PC-linux is a camrecorder ?

Well to simulate a camerate you need iso packet transmission. Unfortunately
this functionality is not yet included in the ohci driver... either buy a
camera, be patient or... write it and submit a patch ;-)

Bonne journee,

--
Sebastien Rougeaux
RSISE, The Australian National University

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