Re: [PATCH] crypto: algif - change algif_skcipher to be asynchronous

[Tadeusz Struk <tadeusz.struk@intel.com>]

Hi Herbert,
On 01/13/2015 09:38 PM, Herbert Xu wrote:
> What you want is AIO so we should try to use that interface rather
> than creating some funky crypto-specific interface.
> 
> Dave, the AIO hooks in net/socket.c is currently simply pointing
> to the sync implementation.  What are you thoughts on allowing
> socket implementations to supply these hooks?
> 
> The algif interface can then use these hooks to implement AIO
> which is useful for maximising the hardware performance without
> resorting to loads of threads.

But then would you like to extend AIO interface to take the IV and
something that would indicate the encrypt/decrypt operation on
aio_write()? Also as far as I can see AIO doesn't support splice()
operation for zero copy, which is the main thing here.

>From the other hand it shouldn't be a problem to add crypto specific
stuff to include/uapi/linux/if_alg.h, because it is all about crypto
anyway, is it not?

If you have a better way how to indicate that data processing should
start on the last page in sendpage() instead of ALG_OP_IN_PLACE I would
be happy to use it.
Thanks,
Tadeusz