netdev - Re: [oss-drivers] Re: [RFC 3/4] nfp: make use of extended ack message reporting

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Message-ID: <5900A14E.1030008@iogearbox.net>
Date:   Wed, 26 Apr 2017 15:31:58 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Simon Horman <simon.horman@...ronome.com>,
        David Miller <davem@...emloft.net>
CC:     jakub.kicinski@...ronome.com, netdev@...r.kernel.org,
        johannes@...solutions.net, dsa@...ulusnetworks.com,
        alexei.starovoitov@...il.com, bblanco@...il.com,
        john.fastabend@...il.com, kubakici@...pl, oss-drivers@...ronome.com
Subject: Re: [oss-drivers] Re: [RFC 3/4] nfp: make use of extended ack message
 reporting

On 04/26/2017 03:03 PM, Jamal Hadi Salim wrote:
> On 17-04-26 07:13 AM, Simon Horman wrote:
>
>> I don't feel strongly about this and perhaps it can be revisited at some
>> point but perhaps it would be worth documenting that he strings do not
>> form part of the UAPI as my expectation would have been that they do f.e. to
>> facilitate internationalisation.
>
> I thought people script against what iproute2 outputs today. We
> may have to change habits.

I would strictly treat this kind of auxiliary information as
non-stable error message data, and it should be documented
as such, f.e. in the man page.

Every driver or subsystem using this could have different
restrictions/semantics and thus error messages will not be
the same everywhere anyway, so there's zero point in parsing
this text from an application in the first place, it's just
passing this through to the user to aide debugging.