[dpdk-dev] [PATCH v3 03/10] eal: split byte order operations to architecture specific

[David Marchand <david.marchand@6wind.com>]

From: Chao Zhu <bjzhuc@cn.ibm.com>

This patch splits the byte order operations from DPDK and push them to
architecture specific arch directories, so that other processor
architecture to support DPDK can be easily adopted.

Signed-off-by: Chao Zhu <bjzhuc@cn.ibm.com>
Signed-off-by: David Marchand <david.marchand@6wind.com>
---
 lib/librte_eal/common/Makefile                     |    4 +-
 .../common/include/arch/i686/rte_byteorder.h       |  129 ++++++++++
 .../common/include/arch/x86_64/rte_byteorder.h     |  130 ++++++++++
 .../common/include/generic/rte_byteorder.h         |  189 ++++++++++++++
 lib/librte_eal/common/include/rte_byteorder.h      |  270 --------------------
 5 files changed, 450 insertions(+), 272 deletions(-)
 create mode 100644 lib/librte_eal/common/include/arch/i686/rte_byteorder.h
 create mode 100644 lib/librte_eal/common/include/arch/x86_64/rte_byteorder.h
 create mode 100644 lib/librte_eal/common/include/generic/rte_byteorder.h
 delete mode 100644 lib/librte_eal/common/include/rte_byteorder.h

diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile
index 8ab363b..62a39cd 100644
--- a/lib/librte_eal/common/Makefile
+++ b/lib/librte_eal/common/Makefile
@@ -31,7 +31,7 @@
 
 include $(RTE_SDK)/mk/rte.vars.mk
 
-INC := rte_branch_prediction.h rte_byteorder.h rte_common.h
+INC := rte_branch_prediction.h rte_common.h
 INC += rte_cycles.h rte_debug.h rte_eal.h rte_errno.h rte_launch.h rte_lcore.h
 INC += rte_log.h rte_memcpy.h rte_memory.h rte_memzone.h rte_pci.h
 INC += rte_pci_dev_ids.h rte_per_lcore.h rte_prefetch.h rte_random.h
@@ -46,7 +46,7 @@ ifeq ($(CONFIG_RTE_INSECURE_FUNCTION_WARNING),y)
 INC += rte_warnings.h
 endif
 
-GENERIC_INC := rte_atomic.h
+GENERIC_INC := rte_atomic.h rte_byteorder.h
 ARCH_INC := $(GENERIC_INC)
 
 SYMLINK-$(CONFIG_RTE_LIBRTE_EAL)-include := $(addprefix include/,$(INC))
diff --git a/lib/librte_eal/common/include/arch/i686/rte_byteorder.h b/lib/librte_eal/common/include/arch/i686/rte_byteorder.h
new file mode 100644
index 0000000..6d5b23e
--- /dev/null
+++ b/lib/librte_eal/common/include/arch/i686/rte_byteorder.h
@@ -0,0 +1,129 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_BYTEORDER_I686_H_
+#define _RTE_BYTEORDER_I686_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_byteorder.h"
+
+/*
+ * An architecture-optimized byte swap for a 16-bit value.
+ *
+ * Do not use this function directly. The preferred function is rte_bswap16().
+ */
+static inline uint16_t rte_arch_bswap16(uint16_t _x)
+{
+	register uint16_t x = _x;
+	asm volatile ("xchgb %b[x1],%h[x2]"
+		      : [x1] "=Q" (x)
+		      : [x2] "0" (x)
+		      );
+	return x;
+}
+
+/*
+ * An architecture-optimized byte swap for a 32-bit value.
+ *
+ * Do not use this function directly. The preferred function is rte_bswap32().
+ */
+static inline uint32_t rte_arch_bswap32(uint32_t _x)
+{
+	register uint32_t x = _x;
+	asm volatile ("bswap %[x]"
+		      : [x] "+r" (x)
+		      );
+	return x;
+}
+
+/*
+ * An architecture-optimized byte swap for a 64-bit value.
+ *
+  * Do not use this function directly. The preferred function is rte_bswap64().
+ */
+/* Compat./Leg. mode */
+static inline uint64_t rte_arch_bswap64(uint64_t x)
+{
+	uint64_t ret = 0;
+	ret |= ((uint64_t)rte_arch_bswap32(x & 0xffffffffUL) << 32);
+	ret |= ((uint64_t)rte_arch_bswap32((x >> 32) & 0xffffffffUL));
+	return ret;
+}
+
+#ifndef RTE_FORCE_INTRINSICS
+#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap16(x) :		\
+				   rte_arch_bswap16(x)))
+
+#define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap32(x) :		\
+				   rte_arch_bswap32(x)))
+
+#define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap64(x) :		\
+				   rte_arch_bswap64(x)))
+#else
+/*
+ * __builtin_bswap16 is only available gcc 4.8 and upwards
+ */
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
+#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap16(x) :		\
+				   rte_arch_bswap16(x)))
+#endif
+#endif
+
+#define rte_cpu_to_le_16(x) (x)
+#define rte_cpu_to_le_32(x) (x)
+#define rte_cpu_to_le_64(x) (x)
+
+#define rte_cpu_to_be_16(x) rte_bswap16(x)
+#define rte_cpu_to_be_32(x) rte_bswap32(x)
+#define rte_cpu_to_be_64(x) rte_bswap64(x)
+
+#define rte_le_to_cpu_16(x) (x)
+#define rte_le_to_cpu_32(x) (x)
+#define rte_le_to_cpu_64(x) (x)
+
+#define rte_be_to_cpu_16(x) rte_bswap16(x)
+#define rte_be_to_cpu_32(x) rte_bswap32(x)
+#define rte_be_to_cpu_64(x) rte_bswap64(x)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_BYTEORDER_I686_H_ */
diff --git a/lib/librte_eal/common/include/arch/x86_64/rte_byteorder.h b/lib/librte_eal/common/include/arch/x86_64/rte_byteorder.h
new file mode 100644
index 0000000..825e576
--- /dev/null
+++ b/lib/librte_eal/common/include/arch/x86_64/rte_byteorder.h
@@ -0,0 +1,130 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_BYTEORDER_X86_64_H_
+#define _RTE_BYTEORDER_X86_64_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_byteorder.h"
+
+/*
+ * An architecture-optimized byte swap for a 16-bit value.
+ *
+ * Do not use this function directly. The preferred function is rte_bswap16().
+ */
+static inline uint16_t rte_arch_bswap16(uint16_t _x)
+{
+	register uint16_t x = _x;
+	asm volatile ("xchgb %b[x1],%h[x2]"
+		      : [x1] "=Q" (x)
+		      : [x2] "0" (x)
+		      );
+	return x;
+}
+
+/*
+ * An architecture-optimized byte swap for a 32-bit value.
+ *
+ * Do not use this function directly. The preferred function is rte_bswap32().
+ */
+static inline uint32_t rte_arch_bswap32(uint32_t _x)
+{
+	register uint32_t x = _x;
+	asm volatile ("bswap %[x]"
+		      : [x] "+r" (x)
+		      );
+	return x;
+}
+
+/*
+ * An architecture-optimized byte swap for a 64-bit value.
+ *
+  * Do not use this function directly. The preferred function is rte_bswap64().
+ */
+/* 64-bit mode */
+static inline uint64_t rte_arch_bswap64(uint64_t _x)
+{
+	register uint64_t x = _x;
+	asm volatile ("bswap %[x]"
+		      : [x] "+r" (x)
+		      );
+	return x;
+}
+
+#ifndef RTE_FORCE_INTRINSICS
+#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap16(x) :		\
+				   rte_arch_bswap16(x)))
+
+#define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap32(x) :		\
+				   rte_arch_bswap32(x)))
+
+#define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap64(x) :		\
+				   rte_arch_bswap64(x)))
+#else
+/*
+ * __builtin_bswap16 is only available gcc 4.8 and upwards
+ */
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
+#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
+				   rte_constant_bswap16(x) :		\
+				   rte_arch_bswap16(x)))
+#endif
+#endif
+
+#define rte_cpu_to_le_16(x) (x)
+#define rte_cpu_to_le_32(x) (x)
+#define rte_cpu_to_le_64(x) (x)
+
+#define rte_cpu_to_be_16(x) rte_bswap16(x)
+#define rte_cpu_to_be_32(x) rte_bswap32(x)
+#define rte_cpu_to_be_64(x) rte_bswap64(x)
+
+#define rte_le_to_cpu_16(x) (x)
+#define rte_le_to_cpu_32(x) (x)
+#define rte_le_to_cpu_64(x) (x)
+
+#define rte_be_to_cpu_16(x) rte_bswap16(x)
+#define rte_be_to_cpu_32(x) rte_bswap32(x)
+#define rte_be_to_cpu_64(x) rte_bswap64(x)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_BYTEORDER_X86_64_H_ */
diff --git a/lib/librte_eal/common/include/generic/rte_byteorder.h b/lib/librte_eal/common/include/generic/rte_byteorder.h
new file mode 100644
index 0000000..9358136
--- /dev/null
+++ b/lib/librte_eal/common/include/generic/rte_byteorder.h
@@ -0,0 +1,189 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_BYTEORDER_H_
+#define _RTE_BYTEORDER_H_
+
+/**
+ * @file
+ *
+ * Byte Swap Operations
+ *
+ * This file defines a generic API for byte swap operations. Part of
+ * the implementation is architecture-specific.
+ */
+
+#include <stdint.h>
+
+/*
+ * An internal function to swap bytes in a 16-bit value.
+ *
+ * It is used by rte_bswap16() when the value is constant. Do not use
+ * this function directly; rte_bswap16() is preferred.
+ */
+static inline uint16_t
+rte_constant_bswap16(uint16_t x)
+{
+	return (uint16_t)(((x & 0x00ffU) << 8) |
+		((x & 0xff00U) >> 8));
+}
+
+/*
+ * An internal function to swap bytes in a 32-bit value.
+ *
+ * It is used by rte_bswap32() when the value is constant. Do not use
+ * this function directly; rte_bswap32() is preferred.
+ */
+static inline uint32_t
+rte_constant_bswap32(uint32_t x)
+{
+	return  ((x & 0x000000ffUL) << 24) |
+		((x & 0x0000ff00UL) << 8) |
+		((x & 0x00ff0000UL) >> 8) |
+		((x & 0xff000000UL) >> 24);
+}
+
+/*
+ * An internal function to swap bytes of a 64-bit value.
+ *
+ * It is used by rte_bswap64() when the value is constant. Do not use
+ * this function directly; rte_bswap64() is preferred.
+ */
+static inline uint64_t
+rte_constant_bswap64(uint64_t x)
+{
+	return  ((x & 0x00000000000000ffULL) << 56) |
+		((x & 0x000000000000ff00ULL) << 40) |
+		((x & 0x0000000000ff0000ULL) << 24) |
+		((x & 0x00000000ff000000ULL) <<  8) |
+		((x & 0x000000ff00000000ULL) >>  8) |
+		((x & 0x0000ff0000000000ULL) >> 24) |
+		((x & 0x00ff000000000000ULL) >> 40) |
+		((x & 0xff00000000000000ULL) >> 56);
+}
+
+
+#ifdef __DOXYGEN__
+
+/**
+ * Swap bytes in a 16-bit value.
+ */
+static uint16_t rte_bswap16(uint16_t _x);
+
+/**
+ * Swap bytes in a 32-bit value.
+ */
+static uint32_t rte_bswap32(uint32_t x);
+
+/**
+ * Swap bytes in a 64-bit value.
+ */
+static uint64_t rte_bswap64(uint64_t x);
+
+/**
+ * Convert a 16-bit value from CPU order to little endian.
+ */
+static uint16_t rte_cpu_to_le_16(uint16_t x);
+
+/**
+ * Convert a 32-bit value from CPU order to little endian.
+ */
+static uint32_t rte_cpu_to_le_32(uint32_t x);
+
+/**
+ * Convert a 64-bit value from CPU order to little endian.
+ */
+static uint64_t rte_cpu_to_le_64(uint64_t x);
+
+
+/**
+ * Convert a 16-bit value from CPU order to big endian.
+ */
+static uint16_t rte_cpu_to_be_16(uint16_t x);
+
+/**
+ * Convert a 32-bit value from CPU order to big endian.
+ */
+static uint32_t rte_cpu_to_be_32(uint32_t x);
+
+/**
+ * Convert a 64-bit value from CPU order to big endian.
+ */
+static uint64_t rte_cpu_to_be_64(uint64_t x);
+
+
+/**
+ * Convert a 16-bit value from little endian to CPU order.
+ */
+static uint16_t rte_le_to_cpu_16(uint16_t x);
+
+/**
+ * Convert a 32-bit value from little endian to CPU order.
+ */
+static uint32_t rte_le_to_cpu_32(uint32_t x);
+
+/**
+ * Convert a 64-bit value from little endian to CPU order.
+ */
+static uint64_t rte_le_to_cpu_64(uint64_t x);
+
+
+/**
+ * Convert a 16-bit value from big endian to CPU order.
+ */
+static uint16_t rte_be_to_cpu_16(uint16_t x);
+
+/**
+ * Convert a 32-bit value from big endian to CPU order.
+ */
+static uint32_t rte_be_to_cpu_32(uint32_t x);
+
+/**
+ * Convert a 64-bit value from big endian to CPU order.
+ */
+static uint64_t rte_be_to_cpu_64(uint64_t x);
+
+#endif /* __DOXYGEN__ */
+
+#ifdef RTE_FORCE_INTRINSICS
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
+#define rte_bswap16(x) __builtin_bswap16(x)
+#endif
+
+#define rte_bswap32(x) __builtin_bswap32(x)
+
+#define rte_bswap64(x) __builtin_bswap64(x)
+
+#endif
+
+#endif /* _RTE_BYTEORDER_H_ */
diff --git a/lib/librte_eal/common/include/rte_byteorder.h b/lib/librte_eal/common/include/rte_byteorder.h
deleted file mode 100644
index 30fbd56..0000000
--- a/lib/librte_eal/common/include/rte_byteorder.h
+++ /dev/null
@@ -1,270 +0,0 @@
-/*-
- *   BSD LICENSE
- *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- *   All rights reserved.
- *
- *   Redistribution and use in source and binary forms, with or without
- *   modification, are permitted provided that the following conditions
- *   are met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in
- *       the documentation and/or other materials provided with the
- *       distribution.
- *     * Neither the name of Intel Corporation nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef _RTE_BYTEORDER_H_
-#define _RTE_BYTEORDER_H_
-
-/**
- * @file
- *
- * Byte Swap Operations
- *
- * This file defines a generic API for byte swap operations. Part of
- * the implementation is architecture-specific.
- */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stdint.h>
-
-/*
- * An internal function to swap bytes in a 16-bit value.
- *
- * It is used by rte_bswap16() when the value is constant. Do not use
- * this function directly; rte_bswap16() is preferred.
- */
-static inline uint16_t
-rte_constant_bswap16(uint16_t x)
-{
-	return (uint16_t)(((x & 0x00ffU) << 8) |
-		((x & 0xff00U) >> 8));
-}
-
-/*
- * An internal function to swap bytes in a 32-bit value.
- *
- * It is used by rte_bswap32() when the value is constant. Do not use
- * this function directly; rte_bswap32() is preferred.
- */
-static inline uint32_t
-rte_constant_bswap32(uint32_t x)
-{
-	return  ((x & 0x000000ffUL) << 24) |
-		((x & 0x0000ff00UL) << 8) |
-		((x & 0x00ff0000UL) >> 8) |
-		((x & 0xff000000UL) >> 24);
-}
-
-/*
- * An internal function to swap bytes of a 64-bit value.
- *
- * It is used by rte_bswap64() when the value is constant. Do not use
- * this function directly; rte_bswap64() is preferred.
- */
-static inline uint64_t
-rte_constant_bswap64(uint64_t x)
-{
-	return  ((x & 0x00000000000000ffULL) << 56) |
-		((x & 0x000000000000ff00ULL) << 40) |
-		((x & 0x0000000000ff0000ULL) << 24) |
-		((x & 0x00000000ff000000ULL) <<  8) |
-		((x & 0x000000ff00000000ULL) >>  8) |
-		((x & 0x0000ff0000000000ULL) >> 24) |
-		((x & 0x00ff000000000000ULL) >> 40) |
-		((x & 0xff00000000000000ULL) >> 56);
-}
-
-/*
- * An architecture-optimized byte swap for a 16-bit value.
- *
- * Do not use this function directly. The preferred function is rte_bswap16().
- */
-static inline uint16_t rte_arch_bswap16(uint16_t _x)
-{
-	register uint16_t x = _x;
-	asm volatile ("xchgb %b[x1],%h[x2]"
-		      : [x1] "=Q" (x)
-		      : [x2] "0" (x)
-		      );
-	return x;
-}
-
-/*
- * An architecture-optimized byte swap for a 32-bit value.
- *
- * Do not use this function directly. The preferred function is rte_bswap32().
- */
-static inline uint32_t rte_arch_bswap32(uint32_t _x)
-{
-	register uint32_t x = _x;
-	asm volatile ("bswap %[x]"
-		      : [x] "+r" (x)
-		      );
-	return x;
-}
-
-/*
- * An architecture-optimized byte swap for a 64-bit value.
- *
-  * Do not use this function directly. The preferred function is rte_bswap64().
- */
-#ifdef RTE_ARCH_X86_64
-/* 64-bit mode */
-static inline uint64_t rte_arch_bswap64(uint64_t _x)
-{
-	register uint64_t x = _x;
-	asm volatile ("bswap %[x]"
-		      : [x] "+r" (x)
-		      );
-	return x;
-}
-#else /* ! RTE_ARCH_X86_64 */
-/* Compat./Leg. mode */
-static inline uint64_t rte_arch_bswap64(uint64_t x)
-{
-	uint64_t ret = 0;
-	ret |= ((uint64_t)rte_arch_bswap32(x & 0xffffffffUL) << 32);
-	ret |= ((uint64_t)rte_arch_bswap32((x >> 32) & 0xffffffffUL));
-	return ret;
-}
-#endif /* RTE_ARCH_X86_64 */
-
-
-#ifndef RTE_FORCE_INTRINSICS
-/**
- * Swap bytes in a 16-bit value.
- */
-#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
-				   rte_constant_bswap16(x) :		\
-				   rte_arch_bswap16(x)))
-
-/**
- * Swap bytes in a 32-bit value.
- */
-#define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ?		\
-				   rte_constant_bswap32(x) :		\
-				   rte_arch_bswap32(x)))
-
-/**
- * Swap bytes in a 64-bit value.
- */
-#define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ?		\
-				   rte_constant_bswap64(x) :		\
-				   rte_arch_bswap64(x)))
-
-#else
-
-/**
- * Swap bytes in a 16-bit value.
- * __builtin_bswap16 is only available gcc 4.8 and upwards
- */
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
-#define rte_bswap16(x) __builtin_bswap16(x)
-#else
-#define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?		\
-				   rte_constant_bswap16(x) :		\
-				   rte_arch_bswap16(x)))
-#endif
-
-/**
- * Swap bytes in a 32-bit value.
- */
-#define rte_bswap32(x) __builtin_bswap32(x)
-
-/**
- * Swap bytes in a 64-bit value.
- */
-#define rte_bswap64(x) __builtin_bswap64(x)
-
-#endif
-
-/**
- * Convert a 16-bit value from CPU order to little endian.
- */
-#define rte_cpu_to_le_16(x) (x)
-
-/**
- * Convert a 32-bit value from CPU order to little endian.
- */
-#define rte_cpu_to_le_32(x) (x)
-
-/**
- * Convert a 64-bit value from CPU order to little endian.
- */
-#define rte_cpu_to_le_64(x) (x)
-
-
-/**
- * Convert a 16-bit value from CPU order to big endian.
- */
-#define rte_cpu_to_be_16(x) rte_bswap16(x)
-
-/**
- * Convert a 32-bit value from CPU order to big endian.
- */
-#define rte_cpu_to_be_32(x) rte_bswap32(x)
-
-/**
- * Convert a 64-bit value from CPU order to big endian.
- */
-#define rte_cpu_to_be_64(x) rte_bswap64(x)
-
-
-/**
- * Convert a 16-bit value from little endian to CPU order.
- */
-#define rte_le_to_cpu_16(x) (x)
-
-/**
- * Convert a 32-bit value from little endian to CPU order.
- */
-#define rte_le_to_cpu_32(x) (x)
-
-/**
- * Convert a 64-bit value from little endian to CPU order.
- */
-#define rte_le_to_cpu_64(x) (x)
-
-
-/**
- * Convert a 16-bit value from big endian to CPU order.
- */
-#define rte_be_to_cpu_16(x) rte_bswap16(x)
-
-/**
- * Convert a 32-bit value from big endian to CPU order.
- */
-#define rte_be_to_cpu_32(x) rte_bswap32(x)
-
-/**
- * Convert a 64-bit value from big endian to CPU order.
- */
-#define rte_be_to_cpu_64(x) rte_bswap64(x)
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _RTE_BYTEORDER_H_ */
-- 
1.7.10.4