linux-kernel - Re: [PATCH 3/7] crypto: qce: Add mode for rfc4309

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Message-ID: <20210405223247.GC904837@yoga>
Date:   Mon, 5 Apr 2021 17:32:47 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        ebiggers@...gle.com, ardb@...nel.org, sivaprak@...eaurora.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] crypto: qce: Add mode for rfc4309

On Thu 25 Feb 12:27 CST 2021, Thara Gopinath wrote:

> rf4309 is the specification that uses aes ccm algorithms with IPsec
> security packets. Add a submode to identify rfc4309 ccm(aes) algorithm
> in the crypto driver.
> 
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
>  drivers/crypto/qce/common.h | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/qce/common.h b/drivers/crypto/qce/common.h
> index 3bc244bcca2d..3ffe719b79e4 100644
> --- a/drivers/crypto/qce/common.h
> +++ b/drivers/crypto/qce/common.h
> @@ -51,9 +51,11 @@
>  #define QCE_MODE_CCM			BIT(12)
>  #define QCE_MODE_MASK			GENMASK(12, 8)
>  
> +#define QCE_MODE_CCM_RFC4309		BIT(13)
> +
>  /* cipher encryption/decryption operations */
> -#define QCE_ENCRYPT			BIT(13)
> -#define QCE_DECRYPT			BIT(14)
> +#define QCE_ENCRYPT			BIT(14)
> +#define QCE_DECRYPT			BIT(15)

Can't we move these further up, so that next time we want to add
something it doesn't require that we also move the ENC/DEC bits?

>  
>  #define IS_DES(flags)			(flags & QCE_ALG_DES)
>  #define IS_3DES(flags)			(flags & QCE_ALG_3DES)
> @@ -73,6 +75,7 @@
>  #define IS_CTR(mode)			(mode & QCE_MODE_CTR)
>  #define IS_XTS(mode)			(mode & QCE_MODE_XTS)
>  #define IS_CCM(mode)			(mode & QCE_MODE_CCM)
> +#define IS_CCM_RFC4309(mode)		((mode) & QCE_MODE_CCM_RFC4309)

While leaving room for the typical macro issues, none of the other
macros wrap the argument in parenthesis. Please follow the style of the
driver, and perhaps follow up with a cleanup patch that just wraps them
all in parenthesis?

Regards,
Bjorn

>  
>  #define IS_ENCRYPT(dir)			(dir & QCE_ENCRYPT)
>  #define IS_DECRYPT(dir)			(dir & QCE_DECRYPT)
> -- 
> 2.25.1
>