netdev - Re: [PATCH RFC v1 1/3] bpf: move from sha1 to blake2s in tag calculation

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Message-ID: <CAADnVQLF_tmNmNk+H+jP1Ubmw-MBhG1FevFmtZY6yw5xk2314g@mail.gmail.com>
Date:   Thu, 13 Jan 2022 14:45:36 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH RFC v1 1/3] bpf: move from sha1 to blake2s in tag calculation

On Thu, Jan 13, 2022 at 4:27 AM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> Hi Alexei,
>
> On 1/13/22, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> > Nack.
> > It's part of api. We cannot change it.
>
> This is an RFC patchset, so there's no chance that it'll actually be
> applied as-is, and hence there's no need for the strong hammer nack.
> The point of "request for comments" is comments. Specifically here,
> I'm searching for information on the ins and outs of *why* it might be
> hard to change. How does userspace use this? Why must this 64-bit
> number be unchanged? Why did you do things this way originally? Etc.
> If you could provide a bit of background, we might be able to shake
> out a solution somewhere in there.

There is no problem with the code and nothing to be fixed.