dm verity: log the hash algorithm implementation

Log the hash algorithm's driver name when a dm-verity target is created.
This will help people determine whether the expected implementation is
being used.  It can make an enormous difference; e.g., SHA-256 on ARM
can be 8x faster with the crypto extensions than without.  It can also
be useful to know if an implementation using an external crypto
accelerator is being used instead of a software implementation.

Example message:

[   35.281945] device-mapper: verity: sha256 using implementation "sha256-ce"

We've already found the similar message in fs/crypto/keyinfo.c to be
very useful.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index fc65f0dedf7f702b31d6adf21b8a2b26238c8b43..f4c31ffaa88e4ead28c04d04ea3ce0d695c14c33 100644 (file)
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -1040,6 +1040,15 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
                v->tfm = NULL;
                goto bad;
        }
+
+       /*
+        * dm-verity performance can vary greatly depending on which hash
+        * algorithm implementation is used.  Help people debug performance
+        * problems by logging the ->cra_driver_name.
+        */
+       DMINFO("%s using implementation \"%s\"", v->alg_name,
+              crypto_hash_alg_common(v->tfm)->base.cra_driver_name);
+
        v->digest_size = crypto_ahash_digestsize(v->tfm);
        if ((1 << v->hash_dev_block_bits) < v->digest_size * 2) {
                ti->error = "Digest size too big";