1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c
new file mode 100644
index 000000000000..8c9377ed850c
--- /dev/null
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c
@@ -0,0 +1,297 @@
+/* GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see http://www.gnu.org/licenses
+ *
+ * Please  visit http://www.xyratex.com/contact if you need additional
+ * information or have any questions.
+ *
+ * GPL HEADER END
+ */
+
+/*
+ * Copyright 2012 Xyratex Technology Limited
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+
+#include <crypto/hash.h>
+#include <linux/scatterlist.h>
+#include "../../../include/linux/libcfs/libcfs.h"
+#include "linux-crypto.h"
+/**
+ *  Array of  hash algorithm speed in MByte per second
+ */
+static int cfs_crypto_hash_speeds[CFS_HASH_ALG_MAX];
+
+static int cfs_crypto_hash_alloc(unsigned char alg_id,
+				 const struct cfs_crypto_hash_type **type,
+				 struct ahash_request **req,
+				 unsigned char *key,
+				 unsigned int key_len)
+{
+	struct crypto_ahash *tfm;
+	int     err = 0;
+
+	*type = cfs_crypto_hash_type(alg_id);
+
+	if (!*type) {
+		CWARN("Unsupported hash algorithm id = %d, max id is %d\n",
+		      alg_id, CFS_HASH_ALG_MAX);
+		return -EINVAL;
+	}
+	tfm = crypto_alloc_ahash((*type)->cht_name, 0, CRYPTO_ALG_ASYNC);
+
+	if (IS_ERR(tfm)) {
+		CDEBUG(D_INFO, "Failed to alloc crypto hash %s\n",
+		       (*type)->cht_name);
+		return PTR_ERR(tfm);
+	}
+
+	*req = ahash_request_alloc(tfm, GFP_KERNEL);
+	if (!*req) {
+		CDEBUG(D_INFO, "Failed to alloc ahash_request for %s\n",
+		       (*type)->cht_name);
+		crypto_free_ahash(tfm);
+		return -ENOMEM;
+	}
+
+	ahash_request_set_callback(*req, 0, NULL, NULL);
+
+	/** Shash have different logic for initialization then digest
+	 * shash: crypto_hash_setkey, crypto_hash_init
+	 * digest: crypto_digest_init, crypto_digest_setkey
+	 * Skip this function for digest, because we use shash logic at
+	 * cfs_crypto_hash_alloc.
+	 */
+	if (key)
+		err = crypto_ahash_setkey(tfm, key, key_len);
+	else if ((*type)->cht_key != 0)
+		err = crypto_ahash_setkey(tfm,
+					 (unsigned char *)&((*type)->cht_key),
+					 (*type)->cht_size);
+
+	if (err != 0) {
+		crypto_free_ahash(tfm);
+		return err;
+	}
+
+	CDEBUG(D_INFO, "Using crypto hash: %s (%s) speed %d MB/s\n",
+	       crypto_ahash_alg_name(tfm), crypto_ahash_driver_name(tfm),
+	       cfs_crypto_hash_speeds[alg_id]);
+
+	err = crypto_ahash_init(*req);
+	if (err) {
+		ahash_request_free(*req);
+		crypto_free_ahash(tfm);
+	}
+	return err;
+}
+
+int cfs_crypto_hash_digest(unsigned char alg_id,
+			   const void *buf, unsigned int buf_len,
+			   unsigned char *key, unsigned int key_len,
+			   unsigned char *hash, unsigned int *hash_len)
+{
+	struct scatterlist	sl;
+	struct ahash_request *req;
+	int			err;
+	const struct cfs_crypto_hash_type	*type;
+
+	if (!buf || buf_len == 0 || !hash_len)
+		return -EINVAL;
+
+	err = cfs_crypto_hash_alloc(alg_id, &type, &req, key, key_len);
+	if (err != 0)
+		return err;
+
+	if (!hash || *hash_len < type->cht_size) {
+		*hash_len = type->cht_size;
+		crypto_free_ahash(crypto_ahash_reqtfm(req));
+		ahash_request_free(req);
+		return -ENOSPC;
+	}
+	sg_init_one(&sl, buf, buf_len);
+
+	ahash_request_set_crypt(req, &sl, hash, sl.length);
+	err = crypto_ahash_digest(req);
+	crypto_free_ahash(crypto_ahash_reqtfm(req));
+	ahash_request_free(req);
+
+	return err;
+}
+EXPORT_SYMBOL(cfs_crypto_hash_digest);
+
+struct cfs_crypto_hash_desc *
+	cfs_crypto_hash_init(unsigned char alg_id,
+			     unsigned char *key, unsigned int key_len)
+{
+	struct ahash_request *req;
+	int		     err;
+	const struct cfs_crypto_hash_type       *type;
+
+	err = cfs_crypto_hash_alloc(alg_id, &type, &req, key, key_len);
+
+	if (err)
+		return ERR_PTR(err);
+	return (struct cfs_crypto_hash_desc *)req;
+}
+EXPORT_SYMBOL(cfs_crypto_hash_init);
+
+int cfs_crypto_hash_update_page(struct cfs_crypto_hash_desc *hdesc,
+				struct page *page, unsigned int offset,
+				unsigned int len)
+{
+	struct ahash_request *req = (void *)hdesc;
+	struct scatterlist sl;
+
+	sg_init_table(&sl, 1);
+	sg_set_page(&sl, page, len, offset & ~CFS_PAGE_MASK);
+
+	ahash_request_set_crypt(req, &sl, NULL, sl.length);
+	return crypto_ahash_update(req);
+}
+EXPORT_SYMBOL(cfs_crypto_hash_update_page);
+
+int cfs_crypto_hash_update(struct cfs_crypto_hash_desc *hdesc,
+			   const void *buf, unsigned int buf_len)
+{
+	struct ahash_request *req = (void *)hdesc;
+	struct scatterlist sl;
+
+	sg_init_one(&sl, buf, buf_len);
+
+	ahash_request_set_crypt(req, &sl, NULL, sl.length);
+	return crypto_ahash_update(req);
+}
+EXPORT_SYMBOL(cfs_crypto_hash_update);
+
+/*      If hash_len pointer is NULL - destroy descriptor. */
+int cfs_crypto_hash_final(struct cfs_crypto_hash_desc *hdesc,
+			  unsigned char *hash, unsigned int *hash_len)
+{
+	int     err;
+	struct ahash_request *req = (void *)hdesc;
+	int size = crypto_ahash_digestsize(crypto_ahash_reqtfm(req));
+
+	if (!hash_len) {
+		crypto_free_ahash(crypto_ahash_reqtfm(req));
+		ahash_request_free(req);
+		return 0;
+	}
+	if (!hash || *hash_len < size) {
+		*hash_len = size;
+		return -ENOSPC;
+	}
+	ahash_request_set_crypt(req, NULL, hash, 0);
+	err = crypto_ahash_final(req);
+
+	if (err < 0) {
+		/* May be caller can fix error */
+		return err;
+	}
+	crypto_free_ahash(crypto_ahash_reqtfm(req));
+	ahash_request_free(req);
+	return err;
+}
+EXPORT_SYMBOL(cfs_crypto_hash_final);
+
+static void cfs_crypto_performance_test(unsigned char alg_id,
+					const unsigned char *buf,
+					unsigned int buf_len)
+{
+	unsigned long		   start, end;
+	int			     bcount, err = 0;
+	int			     sec = 1; /* do test only 1 sec */
+	unsigned char		   hash[64];
+	unsigned int		    hash_len = 64;
+
+	for (start = jiffies, end = start + sec * HZ, bcount = 0;
+	     time_before(jiffies, end); bcount++) {
+		err = cfs_crypto_hash_digest(alg_id, buf, buf_len, NULL, 0,
+					     hash, &hash_len);
+		if (err)
+			break;
+	}
+	end = jiffies;
+
+	if (err) {
+		cfs_crypto_hash_speeds[alg_id] =  -1;
+		CDEBUG(D_INFO, "Crypto hash algorithm %s, err = %d\n",
+		       cfs_crypto_hash_name(alg_id), err);
+	} else {
+		unsigned long   tmp;
+
+		tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) *
+		       1000) / (1024 * 1024);
+		cfs_crypto_hash_speeds[alg_id] = (int)tmp;
+	}
+	CDEBUG(D_INFO, "Crypto hash algorithm %s speed = %d MB/s\n",
+	       cfs_crypto_hash_name(alg_id), cfs_crypto_hash_speeds[alg_id]);
+}
+
+int cfs_crypto_hash_speed(unsigned char hash_alg)
+{
+	if (hash_alg < CFS_HASH_ALG_MAX)
+		return cfs_crypto_hash_speeds[hash_alg];
+	return -1;
+}
+EXPORT_SYMBOL(cfs_crypto_hash_speed);
+
+/**
+ * Do performance test for all hash algorithms.
+ */
+static int cfs_crypto_test_hashes(void)
+{
+	unsigned char	   i;
+	unsigned char	   *data;
+	unsigned int	    j;
+	/* Data block size for testing hash. Maximum
+	 * kmalloc size for 2.6.18 kernel is 128K
+	 */
+	unsigned int	    data_len = 1 * 128 * 1024;
+
+	data = kmalloc(data_len, 0);
+	if (!data)
+		return -ENOMEM;
+
+	for (j = 0; j < data_len; j++)
+		data[j] = j & 0xff;
+
+	for (i = 0; i < CFS_HASH_ALG_MAX; i++)
+		cfs_crypto_performance_test(i, data, data_len);
+
+	kfree(data);
+	return 0;
+}
+
+static int adler32;
+
+int cfs_crypto_register(void)
+{
+	request_module("crc32c");
+
+	adler32 = cfs_crypto_adler32_register();
+
+	/* check all algorithms and do performance test */
+	cfs_crypto_test_hashes();
+	return 0;
+}
+
+void cfs_crypto_unregister(void)
+{
+	if (adler32 == 0)
+		cfs_crypto_adler32_unregister();
+}