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| author | Marcelo Cerri <marcelo.cerri@canonical.com> | 2017-02-27 13:38:26 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-03-09 11:34:39 +0100 |
| commit | d2c2a85cfe829f9d0736dba567edc86ba8524fb2 (patch) | |
| tree | d6e708d6dca58c5660b67c458594fde53f35e059 /crypto/ctr.c | |
| parent | crypto: cbc - Propagate NEED_FALLBACK bit (diff) | |
| download | linux-d2c2a85cfe829f9d0736dba567edc86ba8524fb2.tar.xz linux-d2c2a85cfe829f9d0736dba567edc86ba8524fb2.zip | |
crypto: ctr - Propagate NEED_FALLBACK bit
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 <marcelo.cerri@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ctr.c')
| -rw-r--r-- | crypto/ctr.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c index a4f4a8983169..477d9226ccaa 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 ERR_CAST(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); @@ -350,6 +359,8 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, struct skcipher_alg *alg; struct crypto_skcipher_spawn *spawn; const char *cipher_name; + u32 mask; + int err; algt = crypto_get_attr_type(tb); @@ -367,12 +378,14 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, if (!inst) return -ENOMEM; + mask = crypto_requires_sync(algt->type, algt->mask) | + crypto_requires_off(algt->type, algt->mask, + CRYPTO_ALG_NEED_FALLBACK); + spawn = skcipher_instance_ctx(inst); crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst)); - err = crypto_grab_skcipher(spawn, cipher_name, 0, - crypto_requires_sync(algt->type, - algt->mask)); + err = crypto_grab_skcipher(spawn, cipher_name, 0, mask); if (err) goto err_free_inst; |