[Click] expensive push in kernel mode

[Eddie Kohler]

Hi Giovanni,

Unfortunately, it's difficult to control the headroom on packets emitted 
by FromHost, because those packets are generated by non-Click code in 
the kernel.  I think you'd have to modify the kernel.

LinuxIPLookup USED to work in kernel space, but it does not do so now. 
You might take a look at the code in 
elements/linuxmodule/lookupiproutelinux.cc and see if you can update it. 
  We'd love to see patches.

Eddie


Giovanni Di Stasi wrote:
> Hi again,
> I'm having a problem with push_expensive. I'm
> compiling Click as a kernel 
> module and I've developed an element which adds an
> extra header to packets.
> In usermode, I managed to get rid of those expensive
> push modifying the 
> HEADROOM parameter of KernelTun. Now I'm using
> FromDevice in kernel space. 
> How can I do that? Do I have to modify somewhere in
> the linux kernel?
> 
> Another question: how can I look up the Linux's Ip
> routing table from Click in 
> kernel mode? (LinuxIPLookup doesn't work in kernel
> space)
> 
> Thanks.
> 
> 
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