linux-kernel - [PATCH 12/12] staging: lustre: libcfs: calculate crypto performance using pages

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Date:	Sat, 26 Mar 2016 15:40:56 -0400
From:	James Simmons <jsimmons@...radead.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lustre Development List <lustre-devel@...ts.lustre.org>,
	Andreas Dilger <andreas.dilger@...el.com>
Subject: [PATCH 12/12] staging: lustre: libcfs: calculate crypto performance using pages

From: Andreas Dilger <andreas.dilger@...el.com>

Use alloc_page() and use cfs_crypto_hash_update_page()
to compute the hash instead of cfs_crypto_hash_digest(), since
tgt_checksum_bulk() computes the hash by page anyway.

Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5279
Reviewed-on: http://review.whamcloud.com/10982
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Reviewed-by: James Simmons <uja.ornl@...il.com>
Reviewed-by: Alexander Boyko <alexander_boyko@...atex.com>
Reviewed-by: Bob Glossman <bob.glossman@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
---
 .../lustre/lnet/libcfs/linux/linux-crypto.c        |   19 +++++++++++++++++--
 1 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c
index aec7916..f8383dc 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c
@@ -330,8 +330,23 @@ static void cfs_crypto_performance_test(enum cfs_crypto_hash_alg hash_alg)
 
 	for (start = jiffies, end = start + sec * HZ, bcount = 0;
 	     time_before(jiffies, end); bcount++) {
-		err = cfs_crypto_hash_digest(hash_alg, buf, buf_len, NULL, 0,
-					     hash, &hash_len);
+		struct cfs_crypto_hash_desc *hdesc;
+		int i;
+
+		hdesc = cfs_crypto_hash_init(hash_alg, NULL, 0);
+		if (IS_ERR(hdesc)) {
+			err = PTR_ERR(hdesc);
+			break;
+		}
+
+		for (i = 0; i < buf_len / PAGE_SIZE; i++) {
+			err = cfs_crypto_hash_update_page(hdesc, page, 0,
+							  PAGE_SIZE);
+			if (err)
+				break;
+		}
+
+		err = cfs_crypto_hash_final(hdesc, hash, &hash_len);
 		if (err)
 			break;
 	}
-- 
1.7.1