linux-kernel - Re: [PATCH v7 10/12] crypto: x86/aesni - Use the proper data type in struct aesni_xts

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Date:   Thu, 25 May 2023 23:54:14 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        dm-devel@...hat.com, elliott@....com, gmazyland@...il.com,
        luto@...nel.org, dave.hansen@...ux.intel.com, tglx@...utronix.de,
        bp@...en8.de, mingo@...nel.org, x86@...nel.org,
        herbert@...dor.apana.org.au, ardb@...nel.org,
        dan.j.williams@...el.com, bernie.keany@...el.com,
        charishma1.gairuboyina@...el.com,
        lalithambika.krishnakumar@...el.com, nhuck@...gle.com,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v7 10/12] crypto: x86/aesni - Use the proper data type in
 struct aesni_xts_ctx

On Wed, May 24, 2023 at 09:57:15AM -0700, Chang S. Bae wrote:
> +static inline unsigned long aes_align_addr(unsigned long addr)
> +{
> +	return (crypto_tfm_ctx_alignment() >= AESNI_ALIGN) ?
> +	       ALIGN(addr, 1) : ALIGN(addr, AESNI_ALIGN);
> +}

Wouldn't it be simpler to make this take and return 'void *'?  Then the callers
wouldn't need to cast to/from 'unsigned long'.

Also, aligning to a 1-byte boundary is a no-op.

So, please consider the following:

static inline void *aes_align_addr(void *addr)
{
	if (crypto_tfm_ctx_alignment() >= AES_ALIGN)
		return addr;
	return PTR_ALIGN(addr, AES_ALIGN);
}

Also, aesni_rfc4106_gcm_ctx_get() and generic_gcmaes_ctx_get() should call this
too, rather than duplicating similar code.

- Eric