Re: [PATCH V2 08/10] i40iw: Control debug error prints using env variable

[Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>]

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On Thu, Dec 15, 2016 at 09:54:20AM -0700, Jason Gunthorpe wrote:
> On Thu, Dec 15, 2016 at 08:48:07AM +0200, Leon Romanovsky wrote:
>
> > > I was thinking more like a standard:
> > >
> > >   VERBS_PROVIDER_DEBUG=qp,ah,blah
> > >
> > > parser since other than mlx5 that is what providers use env vars for.
> >
> > It is not providers only, but many other libraries in rdma-core are
> > using env variables for tuning (libibverbs/librdmacm/rdma-ndd).
>
> Other things have different requirements, eg all the *daemons* should
> be using the system log and use a command line arg to enable debug,
> rdma-ndd is doing it OK for instance.

I had in mind much simplier infrastucture, just add pr_debug(..) call
and allow every provider to place in any place in their code.

My main point is that I want to see all ENV variables in one place.

>
> I think it is reasonable to focus on small tasks, considering how much
> there is to do. In this case hoisting only the provider debug
> mechanism to util seems like enough and fixes the ugly problem with
> i40iw where it unconditionally prints debug information to stderr..


>
> Jason
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