Hi Herbert,
These are similar changes for cbc and ctr as the one you did for xts. They
rely on the helper function you created.
I confirmed that for vmx-crypto those changes cause the driver to allocate
"cbc(aes-generic)" and "ctr(aes-generic)" as fallbacks instead of
"cbc(p8_aes)" and "ctr(p8_aes)".
If you are ok with those changes, I can convert the remaining templates.
Marcelo Henrique Cerri (2):
crypto: cbc - Propagate NEED_FALLBACK bit
crypto: ctr - Propagate NEED_FALLBACK bit
crypto/cbc.c | 20 ++++++++++++++------
crypto/ctr.c | 13 +++++++++++--
2 files changed, 25 insertions(+), 8 deletions(-)
--
2.7.4
When requesting a fallback algorithm, we should propagate the
NEED_FALLBACK bit when search for the underlying algorithm.
This will prevents drivers from allocating unnecessary fallbacks that
are never called. For instance, currently the vmx-crypto driver will use
the following chain of calls when calling the fallback implementation:
p8_aes_cbc -> cbc(p8_aes) -> aes-generic
However p8_aes will always delegate its calls to aes-generic. With this
patch, p8_aes_cbc will be able to use cbc(aes-generic) directly as its
fallback. The same applies to aes_s390.
Signed-off-by: Marcelo Henrique Cerri <[email protected]>
---
crypto/cbc.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/crypto/cbc.c b/crypto/cbc.c
index bc160a3..7147842 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -108,24 +108,32 @@ static void crypto_cbc_free(struct skcipher_instance *inst)
static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct skcipher_instance *inst;
+ struct crypto_attr_type *algt;
struct crypto_spawn *spawn;
struct crypto_alg *alg;
+ u32 mask;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER);
if (err)
return err;
+ algt = crypto_get_attr_type(tb);
+ if (IS_ERR(algt))
+ return PTR_ERR(algt);
+
+ mask = CRYPTO_ALG_TYPE_MASK |
+ crypto_requires_off(algt->type, algt->mask,
+ CRYPTO_ALG_NEED_FALLBACK);
+
+ alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask);
+ if (IS_ERR(alg))
+ return PTR_ERR(alg);
+
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return -ENOMEM;
- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
- err = PTR_ERR(alg);
- if (IS_ERR(alg))
- goto err_free_inst;
-
spawn = skcipher_instance_ctx(inst);
err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
CRYPTO_ALG_TYPE_MASK);
--
2.7.4
When requesting a fallback algorithm, we should propagate the
NEED_FALLBACK bit when search for the underlying algorithm.
This will prevents drivers from allocating unnecessary fallbacks that
are never called. For instance, currently the vmx-crypto driver will use
the following chain of calls when calling the fallback implementation:
p8_aes_ctr -> ctr(p8_aes) -> aes-generic
However p8_aes will always delegate its calls to aes-generic. With this
patch, p8_aes_ctr will be able to use ctr(aes-generic) directly as its
fallback. The same applies to aes_s390.
Signed-off-by: Marcelo Henrique Cerri <[email protected]>
---
crypto/ctr.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/crypto/ctr.c b/crypto/ctr.c
index a4f4a89..3afe21a 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -181,15 +181,24 @@ static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
{
struct crypto_instance *inst;
+ struct crypto_attr_type *algt;
struct crypto_alg *alg;
+ u32 mask;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
if (err)
return ERR_PTR(err);
- alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
+ algt = crypto_get_attr_type(tb);
+ if (IS_ERR(algt))
+ return PTR_ERR(algt);
+
+ mask = CRYPTO_ALG_TYPE_MASK |
+ crypto_requires_off(algt->type, algt->mask,
+ CRYPTO_ALG_NEED_FALLBACK);
+
+ alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER, mask);
if (IS_ERR(alg))
return ERR_CAST(alg);
--
2.7.4
On Sun, Feb 26, 2017 at 10:03:18PM -0300, Marcelo Henrique Cerri wrote:
> When requesting a fallback algorithm, we should propagate the
> NEED_FALLBACK bit when search for the underlying algorithm.
>
> This will prevents drivers from allocating unnecessary fallbacks that
> are never called. For instance, currently the vmx-crypto driver will use
> the following chain of calls when calling the fallback implementation:
>
> p8_aes_cbc -> cbc(p8_aes) -> aes-generic
>
> However p8_aes will always delegate its calls to aes-generic. With this
> patch, p8_aes_cbc will be able to use cbc(aes-generic) directly as its
> fallback. The same applies to aes_s390.
>
> Signed-off-by: Marcelo Henrique Cerri <[email protected]>
> ---
> crypto/cbc.c | 20 ++++++++++++++------
> 1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/crypto/cbc.c b/crypto/cbc.c
> index bc160a3..7147842 100644
> --- a/crypto/cbc.c
> +++ b/crypto/cbc.c
> @@ -108,24 +108,32 @@ static void crypto_cbc_free(struct skcipher_instance *inst)
> static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
> {
> struct skcipher_instance *inst;
> + struct crypto_attr_type *algt;
> struct crypto_spawn *spawn;
> struct crypto_alg *alg;
> + u32 mask;
> int err;
>
> err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER);
> if (err)
> return err;
>
> + algt = crypto_get_attr_type(tb);
> + if (IS_ERR(algt))
> + return PTR_ERR(algt);
> +
> + mask = CRYPTO_ALG_TYPE_MASK |
> + crypto_requires_off(algt->type, algt->mask,
> + CRYPTO_ALG_NEED_FALLBACK);
> +
> + alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask);
> + if (IS_ERR(alg))
> + return PTR_ERR(alg);
> +
> inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
> if (!inst)
> return -ENOMEM;
You're leaking alg if the kzalloc of inst fails. Easiest fix
would be to do crypto_get_attr_alg after the kzalloc as is the
status quo.
Thanks,
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt