Cosmetic patch adding a few comments to the ahash caching function to
understand easily what calculations are made in the functions; and how
the function is working.
Signed-off-by: Antoine Tenart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
---
drivers/crypto/inside-secure/safexcel_hash.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c
index ac922b91b2d7..e53e6b2331db 100644
--- a/drivers/crypto/inside-secure/safexcel_hash.c
+++ b/drivers/crypto/inside-secure/safexcel_hash.c
@@ -484,13 +484,23 @@ static int safexcel_ahash_exit_inv(struct crypto_tfm *tfm)
return 0;
}
+/* safexcel_ahash_cache: cache data until at least one request can be sent to
+ * the engine, aka. when there is at least 1 block size in the pipe.
+ */
static int safexcel_ahash_cache(struct ahash_request *areq)
{
struct safexcel_ahash_req *req = ahash_request_ctx(areq);
struct crypto_ahash *ahash = crypto_ahash_reqtfm(areq);
int queued, cache_len;
+ /* cache_len: everyting accepted by the driver but not sent yet,
+ * tot sz handled by update() - last req sz - tot sz handled by send()
+ */
cache_len = req->len - areq->nbytes - req->processed;
+ /* queued: everything accepted by the driver which will be handled by
+ * the next send() calls.
+ * tot sz handled by update() - tot sz handled by send()
+ */
queued = req->len - req->processed;
/*
--
2.14.3
