[Click] Add headroom keyword to FromDevice?

[Eddie Kohler]

A great idea.  Michael, you're right that in the kernel FromDevice can't 
really have specifiable HEADROOM -- that would require driver changes.  But 
everything else should.  I've checked in a bunch of these; patches welcome.

Eddie


Michael Voorhaen wrote:
> I think that just about any packet generating element from 'Network  
> Devices' and 'Host and Socket Communication' could benefit from this.  
> While i'm not sure about this being possible for the linuxmodule, we  
> could at least try to improve consistency across userlevel elements.
> 
> Regards,
> Michael
> 
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> 
> On 09 Jul 2008, at 15:22, Giovanni Di Stasi wrote:
> 
>> Il Wednesday 09 July 2008 14:43:15 Bart Braem ha scritto:
>>> Dear list,
>>>
>>> We noticed that FromHost has a very useful HEADROOM keyword to  
>>> control
>>> headroom added to new packets. Would it be useful to add the same to
>>> FromDevice? In case of bridging or tunneling setups we think it would
>>> be useful to be able to control HEADROOM in the script.
>>> We will create a patch if other people like this feature as well.
>>>
>>> Regards,
>>> Bart
>> To the FromDevice? Yes, it would be a nice addition. But how about  
>> adding this
>> feature to the FromHost belonging to the LinuxModule?
>>
>> It could be useful when you want to add an extra header to avoid
>> the "expensive pushes". However, I don't know if it is easy to make  
>> this
>> addition (maybe it is necessary to modify the linux kernel, in the  
>> parts
>> where packets are created).
>>
>>
>> -- 
>> Giovanni Di Stasi, Junior Researcher
>> Dipartimento di Informatica e Sistemistica
>> Università degli Studi di Napoli "Federico II"
>> Via Claudio, 21 - 80125 Napoli - Italy
>>
>> Phone:    +39 081 7683821
>> Fax:      +39 081 7683816
>> E-mail:   giovanni.distasi at unina.it
>>
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