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Message-ID: <20230926050643.GB3118@sol.localdomain>
Date: Mon, 25 Sep 2023 22:06:43 -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,
herbert@...dor.apana.org.au, davem@...emloft.net, x86@...nel.org
Subject: Re: [PATCH 1/3] crypto: x86/aesni - Refactor the common address
alignment code
On Mon, Sep 25, 2023 at 08:17:50AM -0700, Chang S. Bae wrote:
> The address alignment code has been duplicated for each mode. Instead
> of duplicating the same code, refactor the alignment code and simplify
> the alignment helpers.
>
> Suggested-by: Eric Biggers <ebiggers@...nel.org>
> Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
> Cc: linux-crypto@...r.kernel.org
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Link: https://lore.kernel.org/all/20230526065414.GB875@sol.localdomain/
> ---
> arch/x86/crypto/aesni-intel_glue.c | 26 ++++++++++----------------
> 1 file changed, 10 insertions(+), 16 deletions(-)
>
> diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
> index 39d6a62ac627..241d38ae1ed9 100644
> --- a/arch/x86/crypto/aesni-intel_glue.c
> +++ b/arch/x86/crypto/aesni-intel_glue.c
> @@ -80,6 +80,13 @@ struct gcm_context_data {
> u8 hash_keys[GCM_BLOCK_LEN * 16];
> };
>
> +static inline void *aes_align_addr(void *addr)
> +{
> + if (crypto_tfm_ctx_alignment() >= AESNI_ALIGN)
> + return addr;
> + return PTR_ALIGN(addr, AESNI_ALIGN);
> +}
> +
> asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
> unsigned int key_len);
> asmlinkage void aesni_enc(const void *ctx, u8 *out, const u8 *in);
> @@ -201,32 +208,19 @@ static __ro_after_init DEFINE_STATIC_KEY_FALSE(gcm_use_avx2);
> static inline struct
> aesni_rfc4106_gcm_ctx *aesni_rfc4106_gcm_ctx_get(struct crypto_aead *tfm)
> {
> - unsigned long align = AESNI_ALIGN;
> -
> - if (align <= crypto_tfm_ctx_alignment())
> - align = 1;
> - return PTR_ALIGN(crypto_aead_ctx(tfm), align);
> + return (struct aesni_rfc4106_gcm_ctx *)aes_align_addr(crypto_aead_ctx(tfm));
> }
>
> static inline struct
> generic_gcmaes_ctx *generic_gcmaes_ctx_get(struct crypto_aead *tfm)
> {
> - unsigned long align = AESNI_ALIGN;
> -
> - if (align <= crypto_tfm_ctx_alignment())
> - align = 1;
> - return PTR_ALIGN(crypto_aead_ctx(tfm), align);
> + return (struct generic_gcmaes_ctx *)aes_align_addr(crypto_aead_ctx(tfm));
> }
> #endif
>
> static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
> {
> - unsigned long addr = (unsigned long)raw_ctx;
> - unsigned long align = AESNI_ALIGN;
> -
> - if (align <= crypto_tfm_ctx_alignment())
> - align = 1;
> - return (struct crypto_aes_ctx *)ALIGN(addr, align);
> + return (struct crypto_aes_ctx *)aes_align_addr(raw_ctx);
> }
The casts can be dropped, since aes_align_addr() returns 'void *'.
- Eric
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