linux-kernel - Re: [PATCH v2 3/3] virtio-crypto: implement RSA algorithm

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Date:   Wed, 23 Feb 2022 18:17:21 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     "Gonglei (Arei)" <arei.gonglei@...wei.com>
Cc:     "jasowang@...hat.com" <jasowang@...hat.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "helei.sig11@...edance.com" <helei.sig11@...edance.com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2 3/3] virtio-crypto: implement RSA algorithm


On 2/18/22 11:12 AM, zhenwei pi wrote:
>>> +void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto
>>> +*vcrypto) {
>>> +    int i = 0;
>>> +
>>> +    mutex_lock(&algs_lock);
>>> +
>>> +    for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
>>> +        uint32_t service = virtio_crypto_akcipher_algs[i].service;
>>> +        uint32_t algonum = virtio_crypto_akcipher_algs[i].algonum;
>>> +
>>> +        if (virtio_crypto_akcipher_algs[i].active_devs == 0 ||
>>> +            !virtcrypto_algo_is_supported(vcrypto, service, algonum))
>>> +            continue;
>>> +
>>> +        if (virtio_crypto_akcipher_algs[i].active_devs == 1)
>>> +
>>>     crypto_unregister_akcipher(&virtio_crypto_akcipher_algs[i].algo);
>>> +
>>> +        virtio_crypto_akcipher_algs[i].active_devs--;
>>> +    }
>>> +
>>> +    mutex_unlock(&algs_lock);
>>> +}
>>
>> Why don't you reuse the virtio_crypto_algs_register/unregister functions?
>> The current code is too repetitive. Maybe we don't need create the new 
>> file virtio_crypto_akcipher_algo.c
>> because we had virtio_crypto_algs.c which includes all algorithms.
>>
> 
> Yes, this looks similar to virtio_crypto_algs_register/unregister.
> 
> Let's look at the difference:
> struct virtio_crypto_akcipher_algo {
>          uint32_t algonum;
>          uint32_t service;
>          unsigned int active_devs;
>          struct akcipher_alg algo;
> };
> 
> struct virtio_crypto_algo {
>          uint32_t algonum;
>          uint32_t service;
>          unsigned int active_devs;
>          struct skcipher_alg algo; /* akcipher_alg VS skcipher_alg */
> };
> 
> If reusing virtio_crypto_algs_register/unregister, we need to modify the 
> data structure like this:
> struct virtio_crypto_akcipher_algo {
>          uint32_t algonum;
>          uint32_t service;    /* use service to distinguish 
> akcipher/skcipher */
>          unsigned int active_devs;
>      union {
>          struct skcipher_alg skcipher;
>              struct akcipher_alg akcipher;
>      } alg;
> };
> 
> int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto)
> {
>      ...
>          for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
>                  uint32_t service = virtio_crypto_akcipher_algs[i].service;
>          ...
>          /* test service type then call 
> crypto_register_akcipher/crypto_register_skcipher */
>                  if (service == VIRTIO_CRYPTO_SERVICE_AKCIPHER)
>              
> crypto_register_akcipher(&virtio_crypto_akcipher_algs[i].algo.akcipher);
>          else
>              
> crypto_register_skcipher(&virtio_crypto_skcipher_algs[i].algo.skcipher);
>          ...
>          }
>      ...
> }
> 
> Also test service type and call 
> crypto_unregister_skcipher/crypto_unregister_akcipher.
> 
> This gets unclear from current v2 version.
> 
> On the other hand, the kernel side prefers to separate skcipher and 
> akcipher(separated header files and implementations).
> 
Hi, Lei
I also take a look at other crypto drivers at qat/ccp/hisilicon, they 
separate akcipher/skcipher algo. If you consider that reusing 
virtio_crypto_algs_register/unregister seems better, I will try to merge 
them into a single function.

-- 
zhenwei pi