[PATCH] bpf: remove dependency on vla

[Stephen Hemminger]

On Fri, 15 Aug 2025 14:26:07 +0000
Konstantin Ananyev <konstantin.ananyev at huawei.com> wrote:

> > The code for ethdev callbacks was using variable length arrays
> > which is a feature not supported on MSVC and later C standards.
> > Replace with alloca().  
> 
> I am not a big fun of such mechanical replacement of vla with alloca()
> Specially in that particular case, we can have internal function that uses
> fixed size array and in public one just call it several times in a loop.
> Again, using VLA here is probably a real security breach,
> as we put some assumptions on size of input arrays provided by user,
> which we probably shouldn't.    
> 
> > Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

The other way to handle this is to break the loop into chunks.
But it ends up being more awkward to read, and more complex.