Re: [PATCH v3 1/3] crypto: introduce acomp_is_sleepable to expose if comp drivers might sleep

[Barry Song]

On Tue, Feb 20, 2024 at 12:07 PM Barry Song <21cnbao@xxxxxxxxx> wrote:
>
> On Mon, Feb 19, 2024 at 5:25 PM Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Sat, Feb 17, 2024 at 05:51:00PM +1300, Barry Song wrote:
> > .
> > > diff --git a/crypto/acompress.c b/crypto/acompress.c
> > > index 1c682810a484..fa15df394a4c 100644
> > > --- a/crypto/acompress.c
> > > +++ b/crypto/acompress.c
> > > @@ -152,6 +152,14 @@ struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
> > >  }
> > >  EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
> > >
> > > +bool acomp_is_sleepable(struct crypto_acomp *acomp)
> > > +{
> > > +     struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
> > > +
> > > +     return tfm->__crt_alg->cra_type == &crypto_acomp_type;
> > > +}
> > > +EXPORT_SYMBOL_GPL(acomp_is_sleepable);
> >
> > Just because something is of acomp_type it doesn't mean that it's
> > async.  You should be testing the algorithm flags.
>
> I guess I got your point, drivers using acomp framework might actually
> be SYNC if they don't set CRYPTO_ALG_ASYNC.
>
> >
> > So introduce a helper crypto_acomp_get_flags (see the similar
> > helper crypto_skcipher_get_flags) and test it against CRYPTO_ALG_ASYNC.
>
> On the other hand, some drivers which are actually ASYNC, are lacking
> CRYPTO_ALG_ASYNC for example:
>
> diff --git a/drivers/crypto/hisilicon/zip/zip_crypto.c
> b/drivers/crypto/hisilicon/zip/zip_crypto.c
> index c650c741a18d..94e2d66b04b6 100644
> --- a/drivers/crypto/hisilicon/zip/zip_crypto.c
> +++ b/drivers/crypto/hisilicon/zip/zip_crypto.c
> @@ -591,6 +591,7 @@ static struct acomp_alg hisi_zip_acomp_deflate = {
>         .base                   = {
>                 .cra_name               = "deflate",
>                 .cra_driver_name        = "hisi-deflate-acomp",
> +               .cra_flags              = CRYPTO_ALG_ASYNC,
>                 .cra_module             = THIS_MODULE,
>                 .cra_priority           = HZIP_ALG_PRIORITY,
>                 .cra_ctxsize            = sizeof(struct hisi_zip_ctx),
> diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c
> b/drivers/crypto/intel/iaa/iaa_crypto_main.c
> index dfd3baf0a8d8..91adf9d76a2e 100644
> --- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
> +++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
> @@ -1916,6 +1916,7 @@ static struct acomp_alg iaa_acomp_fixed_deflate = {
>         .base                   = {
>                 .cra_name               = "deflate",
>                 .cra_driver_name        = "deflate-iaa",
> +               .cra_flags              = CRYPTO_ALG_ASYNC,
>                 .cra_ctxsize            = sizeof(struct iaa_compression_ctx),
>                 .cra_module             = THIS_MODULE,
>                 .cra_priority           = IAA_ALG_PRIORITY,
> diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
> index 574cffc90730..5b10bd075a07 100644
> --- a/include/crypto/acompress.h
> +++ b/include/crypto/acompress.h
> @@ -160,6 +160,11 @@ static inline void acomp_request_set_tfm(struct
> acomp_req *req,
>         req->base.tfm = crypto_acomp_tfm(tfm);
>  }
>
> +static inline u32 crypto_acomp_get_flags(struct crypto_acomp *tfm)
> +{
> +       return crypto_tfm_get_flags(crypto_acomp_tfm(tfm));
> +}

This seems to be wrong. we are expecting cra_flags not crt_flags. should be
the below?

diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 574cffc90730..07bd8f6bc79a 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -160,6 +160,11 @@ static inline void acomp_request_set_tfm(struct
acomp_req *req,
        req->base.tfm = crypto_acomp_tfm(tfm);
 }

+static inline u32 crypto_acomp_get_alg_flags(struct crypto_acomp *tfm)
+{
+       return crypto_tfm_alg_flags(crypto_acomp_tfm(tfm));
+}
+
 static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
 {
        return __crypto_acomp_tfm(req->base.tfm);
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index b164da5e129e..811bfaf8b6f8 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -467,6 +467,11 @@ static inline unsigned int
crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
        return tfm->__crt_alg->cra_blocksize;
 }

+static inline unsigned int crypto_tfm_alg_flags(struct crypto_tfm *tfm)
+{
+       return tfm->__crt_alg->cra_flags;
+}
+
 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
 {
        return tfm->__crt_alg->cra_alignmask;

> +
>  static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
>  {
>         return __crypto_acomp_tfm(req->base.tfm);
>
>
> Herbert, Is the above code what you would prefer?
>
> >
> > Cheers,
> > --
> > Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> > Home Page: http://gondor.apana.org.au/~herbert/
> > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
>
Thanks
Barry