On Fri, 09 Oct 2015 20:43:54 +0100
Russell King <rmk+ker...@arm.linux.org.uk> wrote:
> As all the import functions are virtually identical, factor out their
> common parts into a generic mv_cesa_import(). This performs the
> actual import, and we pass the data pointers and current length into
> this function.
Nice factorization indeed. Actually I think this can be done in other
places of this driver, but that's another story.
>
> We have to switch a % const operation to do_div() to avoid provoking
> gcc to use the expensive 64-bit by 64-bit modulus operation.
>
> Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk>
Acked-by: Boris Brezillon <boris.brezil...@free-electrons.com>
Thanks.
> ---
> drivers/crypto/marvell/hash.c | 88
> +++++++++++--------------------------------
> 1 file changed, 21 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c
> index b7c2c05f1a01..4f328b2a3a22 100644
> --- a/drivers/crypto/marvell/hash.c
> +++ b/drivers/crypto/marvell/hash.c
> @@ -822,12 +822,13 @@ static int mv_cesa_md5_export(struct ahash_request
> *req, void *out)
> return 0;
> }
>
> -static int mv_cesa_md5_import(struct ahash_request *req, const void *in)
> +static int mv_cesa_import(struct ahash_request *req, const void *hash, u64
> len,
> + const void *cache)
> {
> - const struct md5_state *in_state = in;
> struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
> struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
> unsigned int digsize = crypto_ahash_digestsize(ahash);
> + unsigned int blocksize;
> unsigned int cache_ptr;
> int ret;
>
> @@ -835,16 +836,17 @@ static int mv_cesa_md5_import(struct ahash_request
> *req, const void *in)
> if (ret)
> return ret;
>
> - if (in_state->byte_count >= sizeof(in_state->block))
> + blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash));
> + if (len >= blocksize)
> mv_cesa_update_op_cfg(&creq->op_tmpl,
> CESA_SA_DESC_CFG_MID_FRAG,
> CESA_SA_DESC_CFG_FRAG_MSK);
>
> - creq->len = in_state->byte_count;
> - memcpy(creq->state, in_state->hash, digsize);
> + creq->len = len;
> + memcpy(creq->state, hash, digsize);
> creq->cache_ptr = 0;
>
> - cache_ptr = creq->len % sizeof(in_state->block);
> + cache_ptr = do_div(len, blocksize);
> if (!cache_ptr)
> return 0;
>
> @@ -852,12 +854,20 @@ static int mv_cesa_md5_import(struct ahash_request
> *req, const void *in)
> if (ret)
> return ret;
>
> - memcpy(creq->cache, in_state->block, cache_ptr);
> + memcpy(creq->cache, cache, cache_ptr);
> creq->cache_ptr = cache_ptr;
>
> return 0;
> }
>
> +static int mv_cesa_md5_import(struct ahash_request *req, const void *in)
> +{
> + const struct md5_state *in_state = in;
> +
> + return mv_cesa_import(req, in_state->hash, in_state->byte_count,
> + in_state->block);
> +}
> +
> static int mv_cesa_md5_digest(struct ahash_request *req)
> {
> int ret;
> @@ -924,37 +934,9 @@ static int mv_cesa_sha1_export(struct ahash_request
> *req, void *out)
> static int mv_cesa_sha1_import(struct ahash_request *req, const void *in)
> {
> const struct sha1_state *in_state = in;
> - struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
> - struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
> - unsigned int digsize = crypto_ahash_digestsize(ahash);
> - unsigned int cache_ptr;
> - int ret;
> -
> - ret = crypto_ahash_init(req);
> - if (ret)
> - return ret;
> -
> - if (in_state->count >= SHA1_BLOCK_SIZE)
> - mv_cesa_update_op_cfg(&creq->op_tmpl,
> - CESA_SA_DESC_CFG_MID_FRAG,
> - CESA_SA_DESC_CFG_FRAG_MSK);
>
> - creq->len = in_state->count;
> - memcpy(creq->state, in_state->state, digsize);
> - creq->cache_ptr = 0;
> -
> - cache_ptr = creq->len % SHA1_BLOCK_SIZE;
> - if (!cache_ptr)
> - return 0;
> -
> - ret = mv_cesa_ahash_alloc_cache(req);
> - if (ret)
> - return ret;
> -
> - memcpy(creq->cache, in_state->buffer, cache_ptr);
> - creq->cache_ptr = cache_ptr;
> -
> - return 0;
> + return mv_cesa_import(req, in_state->state, in_state->count,
> + in_state->buffer);
> }
>
> static int mv_cesa_sha1_digest(struct ahash_request *req)
> @@ -1034,37 +1016,9 @@ static int mv_cesa_sha256_export(struct ahash_request
> *req, void *out)
> static int mv_cesa_sha256_import(struct ahash_request *req, const void *in)
> {
> const struct sha256_state *in_state = in;
> - struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
> - struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
> - unsigned int digsize = crypto_ahash_digestsize(ahash);
> - unsigned int cache_ptr;
> - int ret;
>
> - ret = crypto_ahash_init(req);
> - if (ret)
> - return ret;
> -
> - if (in_state->count >= SHA256_BLOCK_SIZE)
> - mv_cesa_update_op_cfg(&creq->op_tmpl,
> - CESA_SA_DESC_CFG_MID_FRAG,
> - CESA_SA_DESC_CFG_FRAG_MSK);
> -
> - creq->len = in_state->count;
> - memcpy(creq->state, in_state->state, digsize);
> - creq->cache_ptr = 0;
> -
> - cache_ptr = creq->len % SHA256_BLOCK_SIZE;
> - if (!cache_ptr)
> - return 0;
> -
> - ret = mv_cesa_ahash_alloc_cache(req);
> - if (ret)
> - return ret;
> -
> - memcpy(creq->cache, in_state->buf, cache_ptr);
> - creq->cache_ptr = cache_ptr;
> -
> - return 0;
> + return mv_cesa_import(req, in_state->state, in_state->count,
> + in_state->buf);
> }
>
> struct ahash_alg mv_sha256_alg = {
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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