Merge tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull CRC updates from Eric Biggers:
 "Cleanups for the kernel's CRC (cyclic redundancy check) code:

   - Use __ro_after_init where appropriate

   - Remove unnecessary static_key on s390

   - Rename some source code files

   - Rename the crc32 and crc32c crypto API modules

   - Use subsys_initcall instead of arch_initcall

   - Restore maintainers for crc_kunit.c

   - Fold crc16_byte() into crc16.c

   - Add some SPDX license identifiers"

* tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  lib/crc32: add SPDX license identifier
  lib/crc16: unexport crc16_table and crc16_byte()
  w1: ds2406: use crc16() instead of crc16_byte() loop
  MAINTAINERS: add crc_kunit.c back to CRC LIBRARY
  lib/crc: make arch-optimized code use subsys_initcall
  crypto: crc32 - remove "generic" from file and module names
  x86/crc: drop "glue" from filenames
  sparc/crc: drop "glue" from filenames
  s390/crc: drop "glue" from filenames
  powerpc/crc: rename crc32-vpmsum_core.S to crc-vpmsum-template.S
  powerpc/crc: drop "glue" from filenames
  arm64/crc: drop "glue" from filenames
  arm/crc: drop "glue" from filenames
  s390/crc32: Remove no-op module init and exit functions
  s390/crc32: Remove have_vxrs static key
  lib/crc: make the CPU feature static keys __ro_after_init

1 files changed, 222 insertions, 0 deletions

diff --git a/crypto/crc32c.c b/crypto/crc32c.c
new file mode 100644
index 000000000000..b1a36d32dc50
--- /dev/null
+++ b/crypto/crc32c.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API.
+ *
+ * CRC32C chksum
+ *
+ *@Article{castagnoli-crc,
+ * author =       { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
+ * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
+ *                 and 32 Parity Bits}},
+ * journal =      IEEE Transactions on Communication,
+ * year =         {1993},
+ * volume =       {41},
+ * number =       {6},
+ * pages =        {},
+ * month =        {June},
+ *}
+ * Used by the iSCSI driver, possibly others, and derived from
+ * the iscsi-crc.c module of the linux-iscsi driver at
+ * http://linux-iscsi.sourceforge.net.
+ *
+ * Following the example of lib/crc32, this function is intended to be
+ * flexible and useful for all users.  Modules that currently have their
+ * own crc32c, but hopefully may be able to use this one are:
+ *  net/sctp (please add all your doco to here if you change to
+ *            use this one!)
+ *  <endoflist>
+ *
+ * Copyright (c) 2004 Cisco Systems, Inc.
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <linux/unaligned.h>
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+
+#define CHKSUM_BLOCK_SIZE	1
+#define CHKSUM_DIGEST_SIZE	4
+
+struct chksum_ctx {
+	u32 key;
+};
+
+struct chksum_desc_ctx {
+	u32 crc;
+};
+
+/*
+ * Steps through buffer one byte at a time, calculates reflected
+ * crc using table.
+ */
+
+static int chksum_init(struct shash_desc *desc)
+{
+	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	ctx->crc = mctx->key;
+
+	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 chksum_setkey(struct crypto_shash *tfm, const u8 *key,
+			 unsigned int keylen)
+{
+	struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
+
+	if (keylen != sizeof(mctx->key))
+		return -EINVAL;
+	mctx->key = get_unaligned_le32(key);
+	return 0;
+}
+
+static int chksum_update(struct shash_desc *desc, const u8 *data,
+			 unsigned int length)
+{
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	ctx->crc = crc32c_base(ctx->crc, data, length);
+	return 0;
+}
+
+static int chksum_update_arch(struct shash_desc *desc, const u8 *data,
+			      unsigned int length)
+{
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	ctx->crc = crc32c(ctx->crc, data, length);
+	return 0;
+}
+
+static int chksum_final(struct shash_desc *desc, u8 *out)
+{
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	put_unaligned_le32(~ctx->crc, out);
+	return 0;
+}
+
+static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
+{
+	put_unaligned_le32(~crc32c_base(*crcp, data, len), out);
+	return 0;
+}
+
+static int __chksum_finup_arch(u32 *crcp, const u8 *data, unsigned int len,
+			       u8 *out)
+{
+	put_unaligned_le32(~crc32c(*crcp, data, len), out);
+	return 0;
+}
+
+static int chksum_finup(struct shash_desc *desc, const u8 *data,
+			unsigned int len, u8 *out)
+{
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	return __chksum_finup(&ctx->crc, data, len, out);
+}
+
+static int chksum_finup_arch(struct shash_desc *desc, const u8 *data,
+			     unsigned int len, u8 *out)
+{
+	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+	return __chksum_finup_arch(&ctx->crc, data, len, out);
+}
+
+static int chksum_digest(struct shash_desc *desc, const u8 *data,
+			 unsigned int length, u8 *out)
+{
+	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+	return __chksum_finup(&mctx->key, data, length, out);
+}
+
+static int chksum_digest_arch(struct shash_desc *desc, const u8 *data,
+			      unsigned int length, u8 *out)
+{
+	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+	return __chksum_finup_arch(&mctx->key, data, length, out);
+}
+
+static int crc32c_cra_init(struct crypto_tfm *tfm)
+{
+	struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+
+	mctx->key = ~0;
+	return 0;
+}
+
+static struct shash_alg algs[] = {{
+	.digestsize		= CHKSUM_DIGEST_SIZE,
+	.setkey			= chksum_setkey,
+	.init			= chksum_init,
+	.update			= chksum_update,
+	.final			= chksum_final,
+	.finup			= chksum_finup,
+	.digest			= chksum_digest,
+	.descsize		= sizeof(struct chksum_desc_ctx),
+
+	.base.cra_name		= "crc32c",
+	.base.cra_driver_name	= "crc32c-generic",
+	.base.cra_priority	= 100,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= CHKSUM_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct chksum_ctx),
+	.base.cra_module	= THIS_MODULE,
+	.base.cra_init		= crc32c_cra_init,
+}, {
+	.digestsize		= CHKSUM_DIGEST_SIZE,
+	.setkey			= chksum_setkey,
+	.init			= chksum_init,
+	.update			= chksum_update_arch,
+	.final			= chksum_final,
+	.finup			= chksum_finup_arch,
+	.digest			= chksum_digest_arch,
+	.descsize		= sizeof(struct chksum_desc_ctx),
+
+	.base.cra_name		= "crc32c",
+	.base.cra_driver_name	= "crc32c-" __stringify(ARCH),
+	.base.cra_priority	= 150,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= CHKSUM_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct chksum_ctx),
+	.base.cra_module	= THIS_MODULE,
+	.base.cra_init		= crc32c_cra_init,
+}};
+
+static int num_algs;
+
+static int __init crc32c_mod_init(void)
+{
+	/* register the arch flavor only if it differs from the generic one */
+	num_algs = 1 + ((crc32_optimizations() & CRC32C_OPTIMIZATION) != 0);
+
+	return crypto_register_shashes(algs, num_algs);
+}
+
+static void __exit crc32c_mod_fini(void)
+{
+	crypto_unregister_shashes(algs, num_algs);
+}
+
+subsys_initcall(crc32c_mod_init);
+module_exit(crc32c_mod_fini);
+
+MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
+MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CRYPTO("crc32c");
+MODULE_ALIAS_CRYPTO("crc32c-generic");