Revision c6668726d2c2c581e6c417448c472c994d026f5f authored by Linus Torvalds on 24 April 2015, 17:22:09 UTC, committed by Linus Torvalds on 24 April 2015, 17:22:09 UTC
Pull SCSI target updates from Nicholas Bellinger: "Lots of activity in target land the last months. The highlights include: - Convert fabric drivers tree-wide to target_register_template() (hch + bart) - iser-target hardening fixes + v1.0 improvements (sagi) - Convert iscsi_thread_set usage to kthread.h + kill iscsi_target_tq.c (sagi + nab) - Add support for T10-PI WRITE_STRIP + READ_INSERT operation (mkp + sagi + nab) - DIF fixes for CONFIG_DEBUG_SG=y + UNMAP file emulation (akinobu + sagi + mkp) - Extended TCMU ABI v2 for future BIDI + DIF support (andy + ilias) - Fix COMPARE_AND_WRITE handling for NO_ALLLOC drivers (hch + nab) Thanks to everyone who contributed this round with new features, bug-reports, fixes, cleanups and improvements. Looking forward, it's currently shaping up to be a busy v4.2 as well" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (69 commits) target: Put TCMU under a new config option target: Version 2 of TCMU ABI target: fix tcm_mod_builder.py target/file: Fix UNMAP with DIF protection support target/file: Fix SG table for prot_buf initialization target/file: Fix BUG() when CONFIG_DEBUG_SG=y and DIF protection enabled target: Make core_tmr_abort_task() skip TMFs target/sbc: Update sbc_dif_generate pr_debug output target/sbc: Make internal DIF emulation honor ->prot_checks target/sbc: Return INVALID_CDB_FIELD if DIF + sess_prot_type disabled target: Ensure sess_prot_type is saved across session restart target/rd: Don't pass incomplete scatterlist entries to sbc_dif_verify_* target: Remove the unused flag SCF_ACK_KREF target: Fix two sparse warnings target: Fix COMPARE_AND_WRITE with SG_TO_MEM_NOALLOC handling target: simplify the target template registration API target: simplify target_xcopy_init_pt_lun target: remove the unused SCF_CMD_XCOPY_PASSTHROUGH flag target/rd: reduce code duplication in rd_execute_rw() tcm_loop: fixup tpgt string to integer conversion ...
crc32.c
/* 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
*/
/*
* This is crypto api shash wrappers to crc32_le.
*/
#include <linux/crc32.h>
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#define CHKSUM_BLOCK_SIZE 1
#define CHKSUM_DIGEST_SIZE 4
static u32 __crc32_le(u32 crc, unsigned char const *p, size_t len)
{
return crc32_le(crc, p, len);
}
/** No default init with ~0 */
static int crc32_cra_init(struct crypto_tfm *tfm)
{
u32 *key = crypto_tfm_ctx(tfm);
*key = 0;
return 0;
}
/*
* Setting the seed allows arbitrary accumulators and flexible XOR policy
* If your algorithm starts with ~0, then XOR with ~0 before you set
* the seed.
*/
static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
unsigned int keylen)
{
u32 *mctx = crypto_shash_ctx(hash);
if (keylen != sizeof(u32)) {
crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
*mctx = le32_to_cpup((__le32 *)key);
return 0;
}
static int crc32_init(struct shash_desc *desc)
{
u32 *mctx = crypto_shash_ctx(desc->tfm);
u32 *crcp = shash_desc_ctx(desc);
*crcp = *mctx;
return 0;
}
static int crc32_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
u32 *crcp = shash_desc_ctx(desc);
*crcp = __crc32_le(*crcp, data, len);
return 0;
}
/* No final XOR 0xFFFFFFFF, like crc32_le */
static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
u8 *out)
{
*(__le32 *)out = cpu_to_le32(__crc32_le(*crcp, data, len));
return 0;
}
static int crc32_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __crc32_finup(shash_desc_ctx(desc), data, len, out);
}
static int crc32_final(struct shash_desc *desc, u8 *out)
{
u32 *crcp = shash_desc_ctx(desc);
*(__le32 *)out = cpu_to_le32p(crcp);
return 0;
}
static int crc32_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
out);
}
static struct shash_alg alg = {
.setkey = crc32_setkey,
.init = crc32_init,
.update = crc32_update,
.final = crc32_final,
.finup = crc32_finup,
.digest = crc32_digest,
.descsize = sizeof(u32),
.digestsize = CHKSUM_DIGEST_SIZE,
.base = {
.cra_name = "crc32",
.cra_driver_name = "crc32-table",
.cra_priority = 100,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
.cra_init = crc32_cra_init,
}
};
static int __init crc32_mod_init(void)
{
return crypto_register_shash(&alg);
}
static void __exit crc32_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
module_init(crc32_mod_init);
module_exit(crc32_mod_fini);
MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("crc32");
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