new file mode 100644
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * crc64.h
+ *
+ * See lib/crc64.c for the related specification and polynomical arithmetic.
+ */
+#ifndef _LINUX_CRC64_H
+#define _LINUX_CRC64_H
+
+#include <linux/types.h>
+
+__le64 crc64_le_update(__le64 crc, const void *_p, size_t len);
+__le64 crc64_le(const void *p, size_t len);
+__le64 crc64_le_bch(const void *p, size_t len);
+#endif /* _LINUX_CRC64_H */
@@ -2,5 +2,7 @@
# Generated files
#
gen_crc32table
+gen_crc64table
crc32table.h
+crc64table.h
oid_registry_data.c
@@ -170,6 +170,14 @@ config CRC32_BIT
endchoice
+config CRC64
+ tristate "CRC64 functions"
+ help
+ This option is provided for the case where no in-kernel-tree
+ modules require CRC64 functions, but a module built outside
+ the kernel tree does. Such modules that use library CRC64
+ functions require M here.
+
config CRC4
tristate "CRC4 functions"
help
@@ -102,6 +102,7 @@ obj-$(CONFIG_CRC16) += crc16.o
obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o
obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
obj-$(CONFIG_CRC32) += crc32.o
+obj-$(CONFIG_CRC64) += crc64.o
obj-$(CONFIG_CRC32_SELFTEST) += crc32test.o
obj-$(CONFIG_CRC4) += crc4.o
obj-$(CONFIG_CRC7) += crc7.o
@@ -215,7 +216,9 @@ obj-$(CONFIG_FONT_SUPPORT) += fonts/
obj-$(CONFIG_PRIME_NUMBERS) += prime_numbers.o
hostprogs-y := gen_crc32table
+hostprogs-y += gen_crc64table
clean-files := crc32table.h
+clean-files += crc64table.h
$(obj)/crc32.o: $(obj)/crc32table.h
@@ -225,6 +228,14 @@ quiet_cmd_crc32 = GEN $@
$(obj)/crc32table.h: $(obj)/gen_crc32table
$(call cmd,crc32)
+$(obj)/crc64.o: $(obj)/crc64table.h
+
+quiet_cmd_crc64 = GEN $@
+ cmd_crc64 = $< > $@
+
+$(obj)/crc64table.h: $(obj)/gen_crc64table
+ $(call cmd,crc64)
+
#
# Build a fast OID lookip registry from include/linux/oid_registry.h
#
new file mode 100644
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Normal 64bit CRC calculation.
+ *
+ * This is a basic crc64 implementation following ECMA-182 specification,
+ * which can be found from,
+ * http://www.ecma-international.org/publications/standards/Ecma-182.htm
+ *
+ * Dr. Ross N. Williams has a great document to introduce the idea of CRC
+ * algorithm, here the CRC64 code is also inspired by the table-driven
+ * algorithm and detail example from this paper. This paper can be found
+ * from,
+ * http://www.ross.net/crc/download/crc_v3.txt
+ *
+ * crc64table_le[256] is the lookup table of a table-driver 64bit CRC
+ * calculation, which is generated by gen_crc64table.c in kernel build
+ * time. The polynomial of crc64 arithmetic is from ECMA-182 specification
+ * as well, which is defined as,
+ *
+ * x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 +
+ * x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 +
+ * x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 +
+ * x^7 + x^4 + x + 1
+ *
+ * Copyright 2018 SUSE Linux.
+ * Author: Coly Li <colyli@suse.de>
+ *
+ */
+
+#include <linux/module.h>
+#include <uapi/linux/types.h>
+#include "crc64table.h"
+
+MODULE_DESCRIPTION("CRC64 calculations");
+MODULE_LICENSE("GPL");
+
+__le64 crc64_le_update(__le64 crc, const void *_p, size_t len)
+{
+ size_t i, t;
+
+ const unsigned char *p = _p;
+
+ for (i = 0; i < len; i++) {
+ t = ((crc >> 56) ^ (__le64)(*p++)) & 0xFF;
+ crc = crc64table_le[t] ^ (crc << 8);
+ }
+
+ return crc;
+}
+EXPORT_SYMBOL_GPL(crc64_le_update);
+
+__le64 crc64_le(const void *p, size_t len)
+{
+ __le64 crc = 0x0ULL;
+
+ crc = crc64_le_update(crc, p, len);
+
+ return crc;
+}
+EXPORT_SYMBOL_GPL(crc64_le);
+
+/* For checksum calculation in drivers/md/bcache/ */
+__le64 crc64_le_bch(const void *p, size_t len)
+{
+ __le64 crc = 0xFFFFFFFFFFFFFFFFULL;
+
+ crc = crc64_le_update(crc, p, len);
+
+ return (crc ^ 0xFFFFFFFFFFFFFFFFULL);
+}
+EXPORT_SYMBOL_GPL(crc64_le_bch);
new file mode 100644
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generate lookup table for the talbe-driven CRC64 calculation.
+ *
+ * gen_crc64table is executed in kernel build time and generates
+ * lib/crc64table.h. This header is included by lib/crc64.c for
+ * the table-driver CRC64 calculation.
+ *
+ * See lib/crc64.c for more information about which specification
+ * and polynomical arithmetic that gen_crc64table.c follows to
+ * generate the lookup table.
+ *
+ * Copyright 2018 SUSE Linux.
+ * Author: Coly Li <colyli@suse.de>
+ *
+ */
+
+#include <inttypes.h>
+#include <linux/swab.h>
+#include <stdio.h>
+#include "../usr/include/asm/byteorder.h"
+
+#define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
+
+#ifdef __LITTLE_ENDIAN
+# define cpu_to_le64(x) ((__le64)(x))
+#else
+# define cpu_to_le64(x) ((__le64)__swab64(x))
+#endif
+
+static int64_t crc64_table[256] = {0,};
+
+static void generate_crc64_table(void)
+{
+ uint64_t i, j, c, crc;
+
+ for (i = 0; i < 256; i++) {
+ crc = 0;
+ c = i << 56;
+
+ for (j = 0; j < 8; j++) {
+ if ((crc ^ c) & 0x8000000000000000ULL)
+ crc = (crc << 1) ^ CRC64_ECMA182_POLY;
+ else
+ crc <<= 1;
+ c <<= 1;
+ }
+
+ crc64_table[i] = crc;
+ }
+
+}
+
+static void print_crc64le_table(void)
+{
+ int i;
+
+ printf("/* this file is generated - do not edit */\n\n");
+ printf("#include <uapi/linux/types.h>\n");
+ printf("#include <linux/cache.h>\n\n");
+ printf("static const __le64 ____cacheline_aligned crc64table_le[256] = {\n");
+ for (i = 0; i < 256; i++) {
+ printf("\t0x%016" PRIx64 "ULL", cpu_to_le64(crc64_table[i]));
+ if (i & 0x1)
+ printf(",\n");
+ else
+ printf(", ");
+ }
+ printf("};\n");
+}
+
+int main(int argc, char *argv[])
+{
+ generate_crc64_table();
+ print_crc64le_table();
+ return 0;
+}