Re: [microblaze-uclinux] UDP bug in kernel 2.6?

[Michal Simek <monstr@xxxxxxxxx>]

Hi Werner and John,

I tested it tomorrow and I can confirm that this is bug.

Regards,
Michal

> Hi Werner,
> 
> Thanks for your details notes - I'll look into it but your fix seems
> sensible.  Perhaps you can check in other arches to see the return type
> they declare on this function?
> 
> Regards,
> 
> John
> 
> Werner Fries wrote:
>> Hi all,
>>
>> I have trouble using UDP for my microblaze design.
>> I'm using kernel 2.6 from the Petalinux V0.30 RC1 release on a custom
>> platform with Virtex5.
>>
>> It started that I had trouble mounting nfs exports from my development
>> machine on the microblaze system (mount failed with IO error).
>> When I use the "proto=tcp" option with the mount command everything
>> works fine, without any trouble.
>>
>> Also UDP test with netcat didn't work (command on microblaze: nc -l -u
>> -p 1234).
>>
>>
>> After searching the internet I found the following link:
>>   http://forum.niosforum.com/forum/index.php?showtopic=8250
>> I applied the changes described for nios-specific code (see the link
>> above) to the file
>> linux-2.6.x-petalogix/include/asm-microblaze/checksum.h
>> ( changed return value of function csum_fold(unsigned int sum) from type
>> "unsinged int" to "__sum16" )
>>
>> (
>> speedy@linux-ws3:~/work/petalinux-v0.30-rc1/software/linux-2.6.x-petalogix/include/asm-microblaze>
>> diff checksum.h.original checksum.h
>> 61c61
>> < static inline unsigned int csum_fold(unsigned int sum)
>> ---
>>  
>>> static inline __sum16 csum_fold(unsigned int sum)
>>>     
>> )
>>
>> After recompiling the kernel mounting with UDP worked (no error message
>> from the mount command), but operations on mounted files is not stable
>> (e.g. after listing the content of a mounted directory the shell seems
>> to hang, but the uCLinux system is still running).
>> Also a test with netcat worked with the kernel modifications.
>>
>> I'm not a Kernel hacker, but it seems like there is a bug related to
>> UDP / checksum or whatever.
>>
>> Has anybody an idea?
>>
>>
>> Regards
>> Werner
>>
>>
>>
>> ___________________________
>> microblaze-uclinux mailing list
>> microblaze-uclinux@xxxxxxxxxxxxxx
>> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
>> Mailing List Archive :
>> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
>>
>>   
> 
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@xxxxxxxxxxxxxx
> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive :
> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> 
> 
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com Version: 8.0.138 / Virus Database:
> 270.5.5/1569 - Release Date: 23.7.2008 01:31
> 
> 
> 
___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/