linux-kernel - Re: [PATCH 0/4] crypto: nintendo-aes

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Date:   Tue, 21 Sep 2021 14:59:37 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Cc:     linux-crypto@...r.kernel.org, Ash Logan <ash@...quark.com>,
        Jonathan Neuschäfer <j.ne@...teo.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 0/4] crypto: nintendo-aes - add a new AES driver

On Tue, Sep 21, 2021 at 11:39:26PM +0200, Emmanuel Gil Peyrot wrote:
> This engine implements AES in CBC mode, using 128-bit keys only.  It is
> present on both the Wii and the Wii U, and is apparently identical in
> both consoles.
> 
> The hardware is capable of firing an interrupt when the operation is
> done, but this driver currently uses a busy loop, I’m not too sure
> whether it would be preferable to switch, nor how to achieve that.
> 
> It also supports a mode where no operation is done, and thus could be
> used as a DMA copy engine, but I don’t know how to expose that to the
> kernel or whether it would even be useful.
> 
> In my testing, on a Wii U, this driver reaches 80.7 MiB/s, while the
> aes-generic driver only reaches 30.9 MiB/s, so it is a quite welcome
> speedup.
> 
> This driver was written based on reversed documentation, see:
> https://wiibrew.org/wiki/Hardware/AES
> 
> Emmanuel Gil Peyrot (4):
>   crypto: nintendo-aes - add a new AES driver
>   dt-bindings: nintendo-aes: Document the Wii and Wii U AES support
>   powerpc: wii.dts: Expose the AES engine on this platform
>   powerpc: wii_defconfig: Enable AES by default

Does this pass the self-tests, including the fuzz tests which are enabled by
CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y?

- Eric