netdev - Re: Traffic shaping - class ID 16bit limit?

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Message-ID: <20110825101038.6b8c3e02@nehalam.ftrdhcpuser.net>
Date:	Thu, 25 Aug 2011 10:10:38 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Miroslav Kratochvil <exa.exa@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Traffic shaping - class ID 16bit limit?

On Thu, 25 Aug 2011 19:06:58 +0200
Miroslav Kratochvil <exa.exa@...il.com> wrote:

> >> Technically the ClassID seems to be "hardcoded" as a 16bit value, but
> >> after some source searching, I haven't found any good reason for it to
> >> be 16-bit only.
> >
> > Granted it was a poor choice in the initial design.
> > It is wired into the API and changing it would be quite painful.
> >
> 
> I was feeling something like that would come.
> 
> If I get it correctly, the API change would consist of:
> 
> - some netlink protocol change
> - slight modification of qdisc_class_hash
> - modifications in all (four?) hierarchical schedulers
> - tiny expansion of userspace tc utility

And all the magic compatiablity layers to make old code
work with new code.


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