netdev - Re: [PATCH v2 7/8] net: Rename TCA*BPF_DIGEST to ...

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Message-ID: <CALCETrUHenMS1iomFr7+YEy_M3zaotrWbfMe93=BmzCbzJ0fLw@mail.gmail.com>
Date:   Tue, 10 Jan 2017 19:11:49 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Andy Lutomirski <luto@...nel.org>, Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH v2 7/8] net: Rename TCA*BPF_DIGEST to ..._SHA256

On Tue, Jan 10, 2017 at 4:50 PM, Daniel Borkmann <daniel@...earbox.net> wrote:
> On 01/11/2017 12:24 AM, Andy Lutomirski wrote:
>>
>> This makes it easier to add another digest algorithm down the road if
>> needed.  It also serves to force any programs that might have been
>> written against a kernel that had the old field name to notice the
>> change and make any necessary changes.
>>
>> This shouldn't violate any stable API policies, as no released kernel
>> has ever had TCA*BPF_DIGEST.
>
>
> Imho, this and patch 6/8 is not really needed. Should there ever
> another digest alg be used (doubt it), then you'd need a new nl
> attribute and fdinfo line anyway to keep existing stuff intact.
> Nobody made the claim that you can just change this underneath
> and not respecting abi for existing applications when I read from
> above that such apps now will get "forced" to notice a change.

Fair enough.  I was more concerned about prerelease iproute2 versions,
but maybe that's a nonissue.  I'll drop these two patches.

--Andy