linux-kernel - Re: [PATCH v4 08/20] drivers: crypto: meson: cleanup defines

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Message-ID: <82b074b3-6ae1-4e00-8648-8dd938d6e334@linaro.org>
Date: Mon, 12 Feb 2024 18:14:38 +0100
From: neil.armstrong@...aro.org
To: Alexey Romanov <avromanov@...utedevices.com>, clabbe@...libre.com,
 herbert@...dor.apana.org.au, davem@...emloft.net, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 khilman@...libre.com, jbrunet@...libre.com,
 martin.blumenstingl@...glemail.com, vadim.fedorenko@...ux.dev
Cc: linux-crypto@...r.kernel.org, linux-amlogic@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, kernel@...utedevices.com
Subject: Re: [PATCH v4 08/20] drivers: crypto: meson: cleanup defines

On 12/02/2024 14:50, Alexey Romanov wrote:
> It is bad to use hardcoded values directly in the code.
> 
> Signed-off-by: Alexey Romanov <avromanov@...utedevices.com>
> ---
>   drivers/crypto/amlogic/amlogic-gxl-cipher.c | 24 ++++++++++-----------
>   drivers/crypto/amlogic/amlogic-gxl.h        | 16 ++++++++------
>   2 files changed, 21 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> index bc3092a8a2c2..c662c4b86e97 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> +++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> @@ -141,8 +141,8 @@ static int meson_cipher(struct skcipher_request *areq)
>   						 ivsize, 0);
>   		}
>   	}
> -	if (keyivlen == 24)
> -		keyivlen = 32;
> +	if (keyivlen == AES_KEYSIZE_192)
> +		keyivlen = AES_MAX_KEY_SIZE;
>   
>   	phykeyiv = dma_map_single(mc->dev, bkeyiv, keyivlen,
>   				  DMA_TO_DEVICE);
> @@ -161,7 +161,7 @@ static int meson_cipher(struct skcipher_request *areq)
>   		todo = min(keyivlen - eat, 16u);
>   		desc->t_src = cpu_to_le32(phykeyiv + i * 16);
>   		desc->t_dst = cpu_to_le32(i * 16);
> -		v = (MODE_KEY << 20) | DESC_OWN | 16;
> +		v = DESC_MODE_KEY | DESC_OWN | 16;
>   		desc->t_status = cpu_to_le32(v);
>   
>   		eat += todo;
> @@ -205,7 +205,7 @@ static int meson_cipher(struct skcipher_request *areq)
>   		desc->t_src = cpu_to_le32(sg_dma_address(src_sg));
>   		desc->t_dst = cpu_to_le32(sg_dma_address(dst_sg));
>   		todo = min(len, sg_dma_len(src_sg));
> -		v = (op->keymode << 20) | DESC_OWN | todo | (algt->blockmode << 26);
> +		v = op->keymode | DESC_OWN | todo | algt->blockmode;
>   		if (rctx->op_dir)
>   			v |= DESC_ENCRYPTION;
>   		len -= todo;
> @@ -348,14 +348,14 @@ static int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
>   	struct meson_dev *mc = op->mc;
>   
>   	switch (keylen) {
> -	case 128 / 8:
> -		op->keymode = MODE_AES_128;
> +	case AES_KEYSIZE_128:
> +		op->keymode = DESC_MODE_AES_128;
>   		break;
> -	case 192 / 8:
> -		op->keymode = MODE_AES_192;
> +	case AES_KEYSIZE_192:
> +		op->keymode = DESC_MODE_AES_192;
>   		break;
> -	case 256 / 8:
> -		op->keymode = MODE_AES_256;
> +	case AES_KEYSIZE_256:
> +		op->keymode = DESC_MODE_AES_256;
>   		break;
>   	default:
>   		dev_dbg(mc->dev, "ERROR: Invalid keylen %u\n", keylen);
> @@ -373,7 +373,7 @@ static int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
>   static struct meson_alg_template algs[] = {
>   {
>   	.type = CRYPTO_ALG_TYPE_SKCIPHER,
> -	.blockmode = MESON_OPMODE_CBC,
> +	.blockmode = DESC_OPMODE_CBC,
>   	.alg.skcipher.base = {
>   		.base = {
>   			.cra_name = "cbc(aes)",
> @@ -402,7 +402,7 @@ static struct meson_alg_template algs[] = {
>   },
>   {
>   	.type = CRYPTO_ALG_TYPE_SKCIPHER,
> -	.blockmode = MESON_OPMODE_ECB,
> +	.blockmode = DESC_OPMODE_ECB,
>   	.alg.skcipher.base = {
>   		.base = {
>   			.cra_name = "ecb(aes)",
> diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
> index 0a03e8144977..a0d83c82906d 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl.h
> +++ b/drivers/crypto/amlogic/amlogic-gxl.h
> @@ -11,19 +11,21 @@
>   #include <linux/crypto.h>
>   #include <linux/scatterlist.h>
>   
> -#define MODE_KEY 1
> -#define MODE_AES_128 0x8
> -#define MODE_AES_192 0x9
> -#define MODE_AES_256 0xa
> -
>   #define MESON_DECRYPT 0
>   #define MESON_ENCRYPT 1
>   
> -#define MESON_OPMODE_ECB 0
> -#define MESON_OPMODE_CBC 1
> +#define DESC_MODE_KEY (0x1 << 20)
> +#define DESC_MODE_AES_128 (0x8 << 20)
> +#define DESC_MODE_AES_192 (0x9 << 20)
> +#define DESC_MODE_AES_256 (0xa << 20)


>   
>   #define MAXDESC 64
>   
> +#define DESC_OPMODE_ECB (0 << 26)
> +#define DESC_OPMODE_CBC (1 << 26)
> +
> +#define DESC_MAXLEN ((1 << 17) - 1)

GENMASK(16, 0) ?

> +
>   #define DESC_LAST BIT(18)
>   #define DESC_ENCRYPTION BIT(28)
>   #define DESC_OWN BIT(31)

Anyway:
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>