Merge tag 'for-6.9/dm-vdo' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

[sfrench/cifs-2.6.git] / drivers / md / dm-vdo / numeric.h

diff --git a/drivers/md/dm-vdo/numeric.h b/drivers/md/dm-vdo/numeric.h
new file mode 100644 (file)
index 0000000..dc8c400
--- /dev/null
+++ b/drivers/md/dm-vdo/numeric.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef UDS_NUMERIC_H
+#define UDS_NUMERIC_H
+
+#include <asm/unaligned.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+/*
+ * These utilities encode or decode a number from an offset in a larger data buffer and then
+ * advance the offset pointer to the next field in the buffer.
+ */
+
+static inline void decode_s64_le(const u8 *buffer, size_t *offset, s64 *decoded)
+{
+       *decoded = get_unaligned_le64(buffer + *offset);
+       *offset += sizeof(s64);
+}
+
+static inline void encode_s64_le(u8 *data, size_t *offset, s64 to_encode)
+{
+       put_unaligned_le64(to_encode, data + *offset);
+       *offset += sizeof(s64);
+}
+
+static inline void decode_u64_le(const u8 *buffer, size_t *offset, u64 *decoded)
+{
+       *decoded = get_unaligned_le64(buffer + *offset);
+       *offset += sizeof(u64);
+}
+
+static inline void encode_u64_le(u8 *data, size_t *offset, u64 to_encode)
+{
+       put_unaligned_le64(to_encode, data + *offset);
+       *offset += sizeof(u64);
+}
+
+static inline void decode_s32_le(const u8 *buffer, size_t *offset, s32 *decoded)
+{
+       *decoded = get_unaligned_le32(buffer + *offset);
+       *offset += sizeof(s32);
+}
+
+static inline void encode_s32_le(u8 *data, size_t *offset, s32 to_encode)
+{
+       put_unaligned_le32(to_encode, data + *offset);
+       *offset += sizeof(s32);
+}
+
+static inline void decode_u32_le(const u8 *buffer, size_t *offset, u32 *decoded)
+{
+       *decoded = get_unaligned_le32(buffer + *offset);
+       *offset += sizeof(u32);
+}
+
+static inline void encode_u32_le(u8 *data, size_t *offset, u32 to_encode)
+{
+       put_unaligned_le32(to_encode, data + *offset);
+       *offset += sizeof(u32);
+}
+
+static inline void decode_u16_le(const u8 *buffer, size_t *offset, u16 *decoded)
+{
+       *decoded = get_unaligned_le16(buffer + *offset);
+       *offset += sizeof(u16);
+}
+
+static inline void encode_u16_le(u8 *data, size_t *offset, u16 to_encode)
+{
+       put_unaligned_le16(to_encode, data + *offset);
+       *offset += sizeof(u16);
+}
+
+#endif /* UDS_NUMERIC_H */