linux-kernel - Re: [PATCH v1 3/3] crypto: cavium - Register the CNN55XX supported crypto algorithms.

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Date:   Thu, 11 May 2017 17:48:34 +0530
From:   srikanth jampala <jsrikanth@...iumnetworks.com>
To:     Stephan Müller <smueller@...onox.de>,
        Srikanth Jampala <Jampala.Srikanth@...ium.com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        George.Cherian@...ium.com, Nidadavolu.Murthy@...ium.com,
        Sreerama.Gadam@...ium.com, Ram.Kumar@...ium.com
Subject: Re: [PATCH v1 3/3] crypto: cavium - Register the CNN55XX supported
 crypto algorithms.

Hi Stephan,

On Wednesday 10 May 2017 07:26 PM, Stephan Müller wrote:
> Am Mittwoch, 10. Mai 2017, 15:06:40 CEST schrieb Srikanth Jampala:
> 
> Hi Srikanth,
> 
> In general: you are using the ablkcipher API. I think it is on its way out and 
> being replaced with skcipher.
> 
> Maybe it makes sense to replace it here too. It could be as simple as s/
> ablkcipher/skcipher/g
> 
Sure, I will do the changes accordingly.
As per my understanding, I see the following changes,
1. CRYPTO_ALG_TYPE_ABLKCIPHER changed to CRYPTO_ALG_TYPE_SKCIPHER
2. nitrox_ablkcipher_foo() changed to nitrox_skcipher_foo()

Please let me know, any other changes I have to consider?

>> +static inline int nitrox_ablkcipher_setkey(struct crypto_ablkcipher
>> *cipher,
>> +                                          int aes_keylen, const u8 *key,
>> +                                          unsigned int keylen)
>> +{
>> +       struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
>> +       struct nitrox_crypto_instance *inst = crypto_tfm_ctx(tfm);
>> +       struct flexi_crypto_context *fctx;
>> +       enum flexi_cipher cipher_type;
>> +       const char *name;
>> +
>> +       name = crypto_tfm_alg_name(tfm);
>> +       cipher_type = flexi_cipher_type(name);
>> +       if (cipher_type == CIPHER_INVALID) {
>> +               pr_err("unsupported cipher: %s\n", name);
>> +               return -EINVAL;
>> +       }
>> +
>> +       /* fill crypto context */
>> +       fctx = inst->u.fctx;
>> +       fctx->flags = 0;
>> +       fctx->w0.cipher_type = cipher_type;
>> +       fctx->w0.aes_keylen = aes_keylen;
>> +       fctx->w0.iv_source = IV_FROM_DPTR;
>> +       fctx->flags = cpu_to_be64(*(u64 *)&fctx->w0);
>> +       /* copy the key to context */
>> +       memcpy(fctx->crypto.u.key, key, keylen);
> 
> Could you help me finding the location where this memory is zeroized upon 
> release?

Currently, we are not zeroized the context in release.
We are doing it at the time of allocation.

+void *crypto_alloc_context(struct nitrox_device *ndev)
+{
+       struct ctx_hdr *ctx;
+       void *vaddr;
+       dma_addr_t dma;
+
+       vaddr = dma_pool_alloc(ndev->ctx_pool, (GFP_ATOMIC | __GFP_ZERO), &dma);
+       if (!vaddr)
+               return NULL;
+
+       /* fill meta data */
+       ctx = vaddr;
+       ctx->pool = ndev->ctx_pool;
+       ctx->dma = dma;
+       ctx->ctx_dma = dma + sizeof(struct ctx_hdr);
+
+       return ((u8 *)vaddr + sizeof(struct ctx_hdr));
+}

>> +
>> +       return 0;
>> +}