netdev - Re: [RFC] iproute: Add support for extended ack to rtnl

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Date:   Thu, 4 May 2017 09:42:12 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [RFC] iproute: Add support for extended ack to rtnl_talk

On Thu, 04 May 2017 11:36:36 +0200
Daniel Borkmann <daniel@...earbox.net> wrote:

> On 05/04/2017 01:56 AM, Stephen Hemminger wrote:
> > Add support for extended ack error reporting via libmnl. This
> > is a better alternative to use existing library and not copy/paste
> > code from the kernel. Also make arguments const where possible.
> >
> > Add a new function rtnl_talk_extack that takes a callback as an input
> > arg. If a netlink response contains extack attributes, the callback is
> > is invoked with the the err string, offset in the message and a pointer
> > to the message returned by the kernel.
> >
> > Adding a new function allows commands to be moved over to the
> > extended error reporting over time.
> >
> > For feedback, compile tested only.  
> 
> Just out of curiosity, what is the plan regarding converting iproute2
> over to libmnl (ip, tc, ss, ...)? In 2015, tipc tool was the first
> user merged that requires libmnl, the only other user today in the
> tree is devlink, which even seems to define its own libmnl library
> helpers. What is the clear benefit/rationale of outsourcing this to
> libmnl? I always was the impression we should strive for as little
> dependencies as possible?
> 
> I don't really like that we make extended ack reporting now dependent
> on libmnl, which further diverts from iproute's native nl library vs
> requiring to install another nl library, making the current status
> quo even worse ... :/
> 
> Thanks,
> Daniel

No rush for migration. just slow migration as time permits.
This would be good kernel janitor type project.