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    SubjectRe: [PATCH 0/2] Add struct crypto_alg->cra_check_optimized for crc32c_intel
    On Thu, 2011-03-10 at 01:13 -0800, Nicholas A. Bellinger wrote:
    > 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..?

    Just to clarify a bit on my previous comments..

    We are still expecting the libcrypto consumer (iscsi_target_mod.ko) to
    call the arch independent crypto_alloc_hash("crc32c", ...) in order to
    have libcrypto backend logic perform a request_module() upon
    architecture dependent offload modules (like crc32c_intel.ko) that
    libcrypto consumers are not (and should not) be calling directly via
    crypto_alloc_host("crc32c_intel", ...), correct..?

    Where I am getting confused is wrt to a new crypto_alg_mod_lookup() ->
    request_module() call for a struct shash_alg that has not yet be loaded
    via arch/x86/crypto/crc32c-intel.c:crc32c_intel_mod_init() ->



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