Re: [PATCH 0/2] Add struct crypto_alg->cra_check_optimized for crc32c_intel

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

On Thu, 2011-03-10 at 17:09 +0800, Herbert Xu wrote:
> On Thu, Mar 10, 2011 at 12:54:24AM -0800, Nicholas A. Bellinger wrote:
> >
> > OK, so you mean each struct crypto_alg should define something like a
> > 'cra_optimized_name' for which request_module(alg->cra_optimized_name)
> > is called somewhere in libcrypto code..?
> 
> No, what I mean is that whenever we look up an algorithm through
> crypto_alg_mod_lookup, we should conditionally call modprobe if
> we havn't done so already.
> 
> So you just need to record one bit of info in each crypto_alg
> object to indicate whether we have invoked modprobe.  I suggest
> adding a CRYPTO_ALG_* bit.
> 

Mmmm, now I am really confused, and please let me apologize in advance
for my lack of experience with libcrypto internals..  ;)

I thought the problem was that CONFIG_CRYPTO_ALGFOO=y and
CONFIG_CRYPTO_ALGFOO_ARCH_HW_OFFLOAD=m would cause the latter to not
explictly call request_module() for this HW offload case..

So what I don't understand how adding a request_module() call to a list
of known modules works when crc32c_intel.ko has not been loaded yet..?

Am I missing something obvious wrt to how crc32c.ko can tell libcrypto
about which architecture dependent optimized modules it should load..?

Best Regards,

--nab