linux-kernel - Re: [PATCH v2 04/13] RISC-V: crypto: add Zvkned accelerated AES implementation

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Message-ID: <20231128-await-tipper-2094715466f2@spud>
Date:   Tue, 28 Nov 2023 17:54:49 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Jerry Shih <jerry.shih@...ive.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, conor.dooley@...rochip.com,
        ebiggers@...nel.org, ardb@...nel.org, heiko@...ech.de,
        phoebe.chen@...ive.com, hongrong.hsu@...ive.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 04/13] RISC-V: crypto: add Zvkned accelerated AES
 implementation

> +static inline bool check_aes_ext(void)
> +{
> +	return riscv_isa_extension_available(NULL, ZVKNED) &&
> +	       riscv_vector_vlen() >= 128;
> +}

I'm not keen on this construct, where you are checking vlen greater than
128 and the presence of Zvkned without checking for the presence of V
itself. Can you use "has_vector()" in any places where you depend on the
presence of vector please?

Also, there are potentially a lot of places in this drivers where you
can replace "riscv_isa_extension_available()" with
"riscv_has_extension_likely()". The latter is optimised with
alternatives, so in places that are going to be evaluated frequently it
may be beneficial for you.

Cheers,
Conor.

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