From: Andy Lutomirski <luto@amacapital.net>
To: Andy Lutomirski <luto@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Hannes Frederic Sowa <hannes@stressinduktion.org>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Eric Dumazet <edumazet@google.com>,
Eric Biggers <ebiggers3@gmail.com>,
Tom Herbert <tom@herbertland.com>,
"David S. Miller" <davem@davemloft.net>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Herbert Xu <herbert@gondor.apana.org.au>
Subject: Re: [RFC PATCH 4.10 1/6] crypto/sha256: Refactor the API so it can be used without shash
Date: Fri, 23 Dec 2016 18:26:37 -0800 [thread overview]
Message-ID: <CALCETrW8JFtmByxMnSQkP04JZH7V-zEcN+sJaBPNodyKcspvNw@mail.gmail.com> (raw)
In-Reply-To: <942b91f25a63b22ec4946378a1fffe78d655cf18.1482545792.git.luto@kernel.org>
On Fri, Dec 23, 2016 at 6:22 PM, Andy Lutomirski <luto@kernel.org> wrote:
> There are some pieecs of kernel code that want to compute SHA256
> directly without going through the crypto core. Adjust the exported
> API to decouple it from the crypto core.
>
> I suspect this will very slightly speed up the SHA256 shash operations
> as well by reducing the amount of indirection involved.
>
I should also mention: there's a nice potential cleanup that's
possible on top of this. Currently, most of the accelerated SHA256
implementations just swap out the block function. Another approach to
enabling this would be to restructure sha256_update along the lines
of:
sha256_block_fn_t fn = arch_sha256_block_fn(len);
sha256_base_do_update(sctx, data, len, arch_sha256_block_fn(len));
The idea being that arch code can decide whether to use an accelerated
block function based on context (x86, for example, can't always use
xmm regs) and length (on x86, using the accelerated versions for short
digests is very slow due to the state save/restore that happens) and
then the core code can just use it.
This would allow a lot of the boilerplate that this patch was forced
to modify to be deleted outright.
--Andy
next prev parent reply other threads:[~2016-12-24 2:27 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-24 2:22 [RFC PATCH 4.10 0/6] Switch BPF's digest to SHA256 Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 1/6] crypto/sha256: Refactor the API so it can be used without shash Andy Lutomirski
2016-12-24 2:26 ` Andy Lutomirski [this message]
2016-12-24 10:33 ` Ard Biesheuvel
2016-12-24 17:57 ` Andy Lutomirski
2016-12-26 7:57 ` Herbert Xu
2016-12-26 17:51 ` Ard Biesheuvel
2016-12-26 18:08 ` Andy Lutomirski
2016-12-27 9:58 ` Herbert Xu
2016-12-27 14:16 ` Daniel Borkmann
2016-12-27 19:00 ` Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 2/6] crypto/sha256: Make the sha256 library functions selectable Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 3/6] bpf: Use SHA256 instead of SHA1 for bpf digests Andy Lutomirski
2016-12-24 19:59 ` Daniel Borkmann
2016-12-27 1:36 ` Alexei Starovoitov
2016-12-27 2:08 ` Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 4/6] bpf: Avoid copying the entire BPF program when hashing it Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 5/6] bpf: Rename fdinfo's prog_digest to prog_sha256 Andy Lutomirski
2016-12-24 2:22 ` [RFC PATCH 4.10 6/6] net: Rename TCA*BPF_DIGEST to ..._SHA256 Andy Lutomirski
2016-12-26 8:20 ` [RFC PATCH 4.10 0/6] Switch BPF's digest to SHA256 Herbert Xu
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