Re: Async Crypto API

[Dmitry Kasatkin <dmitry.kasatkin@nokia.com>]

Hi,

In the case when finup() is not used, just update/update/../final
driver finalize calculation from the final function.

It takes a time and if it may not sleep, can final() also return
EINPROGRESS?

Thanks,
Dmitry


ext Herbert Xu wrote:
> Dmitry Kasatkin <dmitry.kasatkin@nokia.com> wrote:
>   
>> Hello,
>>
>> I have one question about async api.
>>
>> I work on AHASH driver and wonder about one thing.
>>
>> while calculating hash, client might call many times
>>
>> ahash_request_set_crypt(req, &sg, sha1, len);
>> crypto_ahash_update(req);
>> ..
>> ..
>> ahash_request_set_crypt(req, &sg, sha1, len);
>> crypto_ahash_finup(req);
>>
>> right?
>>
>> But because it is async and driver does not wait_for_completion,
>> previous request may not be completed before client will call next update.
>>
>> But what should be the behavior of the driver?
>>     
>
> If any async operation returns EINPROGRESS, the client must not
> proceed until that operation has completed.
>
> Cheers,
>