linux-kernel - [PATCH RFC 1/4] UAPI: Introduce 128-bit types and byteswap operations

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Message-ID: <20251112015846.1842207-2-huangchenghai2@huawei.com>
Date: Wed, 12 Nov 2025 09:58:43 +0800
From: Chenghai Huang <huangchenghai2@...wei.com>
To: <arnd@...db.de>, <catalin.marinas@....com>, <will@...nel.org>,
	<akpm@...ux-foundation.org>, <anshuman.khandual@....com>,
	<ryan.roberts@....com>, <andriy.shevchenko@...ux.intel.com>,
	<herbert@...dor.apana.org.au>, <linux-kernel@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-crypto@...r.kernel.org>, <linux-api@...r.kernel.org>
CC: <fanghao11@...wei.com>, <shenyang39@...wei.com>, <liulongfang@...wei.com>,
	<qianweili@...wei.com>
Subject: [PATCH RFC 1/4] UAPI: Introduce 128-bit types and byteswap operations

From: Weili Qian <qianweili@...wei.com>

Architectures like ARM64 support 128-bit integer types and
operations. This patch adds a generic byte order conversion
interface for 128-bit.

Signed-off-by: Weili Qian <qianweili@...wei.com>
Signed-off-by: Chenghai Huang <huangchenghai2@...wei.com>
---
 include/uapi/linux/byteorder/big_endian.h    |  6 ++++++
 include/uapi/linux/byteorder/little_endian.h |  6 ++++++
 include/uapi/linux/swab.h                    | 10 ++++++++++
 include/uapi/linux/types.h                   |  3 +++
 4 files changed, 25 insertions(+)

diff --git a/include/uapi/linux/byteorder/big_endian.h b/include/uapi/linux/byteorder/big_endian.h
index 80aa5c41a763..318d51a18f43 100644
--- a/include/uapi/linux/byteorder/big_endian.h
+++ b/include/uapi/linux/byteorder/big_endian.h
@@ -29,6 +29,12 @@
 #define __constant_be32_to_cpu(x) ((__force __u32)(__be32)(x))
 #define __constant_cpu_to_be16(x) ((__force __be16)(__u16)(x))
 #define __constant_be16_to_cpu(x) ((__force __u16)(__be16)(x))
+
+#ifdef __SIZEOF_INT128__
+#define __cpu_to_le128(x) ((__force __le128)__swab128((x)))
+#define __le128_to_cpu(x) __swab128((__force __u128)(__le128)(x))
+#endif
+
 #define __cpu_to_le64(x) ((__force __le64)__swab64((x)))
 #define __le64_to_cpu(x) __swab64((__force __u64)(__le64)(x))
 #define __cpu_to_le32(x) ((__force __le32)__swab32((x)))
diff --git a/include/uapi/linux/byteorder/little_endian.h b/include/uapi/linux/byteorder/little_endian.h
index cd98982e7523..b2732452b825 100644
--- a/include/uapi/linux/byteorder/little_endian.h
+++ b/include/uapi/linux/byteorder/little_endian.h
@@ -29,6 +29,12 @@
 #define __constant_be32_to_cpu(x) ___constant_swab32((__force __u32)(__be32)(x))
 #define __constant_cpu_to_be16(x) ((__force __be16)___constant_swab16((x)))
 #define __constant_be16_to_cpu(x) ___constant_swab16((__force __u16)(__be16)(x))
+
+#ifdef __SIZEOF_INT128__
+#define __cpu_to_le128(x) ((__force __le128)(__u128)(x))
+#define __le128_to_cpu(x) ((__force __u128)(__le128)(x))
+#endif
+
 #define __cpu_to_le64(x) ((__force __le64)(__u64)(x))
 #define __le64_to_cpu(x) ((__force __u64)(__le64)(x))
 #define __cpu_to_le32(x) ((__force __le32)(__u32)(x))
diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
index 01717181339e..7381b9a785ce 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -133,6 +133,16 @@ static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 	__fswab64(x))
 #endif
 
+#ifdef __SIZEOF_INT128__
+static inline __attribute_const__ __u128 __swab128(__u128 val)
+{
+	__u64 h = val >> 64;
+	__u64 l = val;
+
+	return (((__u128)__swab64(l)) << 64) | ((__u128)(__swab64(h)));
+}
+#endif
+
 static __always_inline unsigned long __swab(const unsigned long y)
 {
 #if __BITS_PER_LONG == 64
diff --git a/include/uapi/linux/types.h b/include/uapi/linux/types.h
index 48b933938877..9624ea43cd8a 100644
--- a/include/uapi/linux/types.h
+++ b/include/uapi/linux/types.h
@@ -40,6 +40,9 @@ typedef __u32 __bitwise __be32;
 typedef __u64 __bitwise __le64;
 typedef __u64 __bitwise __be64;
 
+#ifdef __SIZEOF_INT128__
+typedef __u128 __bitwise __le128;
+#endif
 typedef __u16 __bitwise __sum16;
 typedef __u32 __bitwise __wsum;
 
-- 
2.33.0