linux-kernel - Re: [PATCH v5 6/9] crypto: caam - support crypto

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Date:   Tue, 11 Feb 2020 09:51:20 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Iuliana Prodan <iuliana.prodan@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@....com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Silvano Di Ninno <silvano.dininno@....com>,
        Franck Lenormand <franck.lenormand@....com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v5 6/9] crypto: caam - support crypto_engine framework for
 SKCIPHER algorithms

On 1/30/2020 2:49 AM, Iuliana Prodan wrote:
> @@ -1618,6 +1636,8 @@ static struct skcipher_edesc *skcipher_edesc_alloc(struct skcipher_request *req,
>  	edesc->sec4_sg_bytes = sec4_sg_bytes;
>  	edesc->sec4_sg = (struct sec4_sg_entry *)((u8 *)edesc->hw_desc +
>  						  desc_bytes);
> +	edesc->bklog = false;
Since edesc is allocated using kzalloc(), this is redundant.

> @@ -3236,7 +3288,9 @@ static int caam_init_common(struct caam_ctx *ctx, struct caam_alg_entry *caam,
>  
>  	dma_addr = dma_map_single_attrs(ctx->jrdev, ctx->sh_desc_enc,
>  					offsetof(struct caam_ctx,
> -						 sh_desc_enc_dma),
> +						 sh_desc_enc_dma) -
> +					offsetof(struct caam_ctx,
> +						 sh_desc_enc),
>  					ctx->dir, DMA_ATTR_SKIP_CPU_SYNC);
>  	if (dma_mapping_error(ctx->jrdev, dma_addr)) {
>  		dev_err(ctx->jrdev, "unable to map key, shared descriptors\n");
> @@ -3246,8 +3300,12 @@ static int caam_init_common(struct caam_ctx *ctx, struct caam_alg_entry *caam,
>  
>  	ctx->sh_desc_enc_dma = dma_addr;
>  	ctx->sh_desc_dec_dma = dma_addr + offsetof(struct caam_ctx,
> -						   sh_desc_dec);
> -	ctx->key_dma = dma_addr + offsetof(struct caam_ctx, key);
> +						   sh_desc_dec) -
> +					offsetof(struct caam_ctx,
> +						 sh_desc_enc);
> +	ctx->key_dma = dma_addr + offsetof(struct caam_ctx, key) -
> +					offsetof(struct caam_ctx,
> +						 sh_desc_enc);
Let's make this clearer by using a local variable for
offsetof(struct caam_ctx, sh_desc_enc).

> @@ -538,6 +547,26 @@ static int caam_jr_probe(struct platform_device *pdev)
>  		return error;
>  	}
>  
> +	/* Initialize crypto engine */
> +	jrpriv->engine = crypto_engine_alloc_init(jrdev, false);
> +	if (!jrpriv->engine) {
> +		dev_err(jrdev, "Could not init crypto-engine\n");
> +		return -ENOMEM;
> +	}
> +
> +	/* Start crypto engine */
> +	error = crypto_engine_start(jrpriv->engine);
> +	if (error) {
> +		dev_err(jrdev, "Could not start crypto-engine\n");
> +		crypto_engine_exit(jrpriv->engine);
> +		return error;
> +	}
> +
> +	error = devm_add_action_or_reset(jrdev, caam_jr_crypto_engine_exit,
> +					 jrdev);
> +	if (error)
> +		return error;
This should be moved right after crypto_engine_alloc_init(),
and crypto_engine_exit() should be removed from
crypto_engine_start() error path.

Horia