DPDK 22.11.6
rte_byteorder.h
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1/* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
3 */
4
5#ifndef _RTE_BYTEORDER_H_
6#define _RTE_BYTEORDER_H_
7
17#include <stdint.h>
18#ifdef RTE_EXEC_ENV_FREEBSD
19#include <sys/endian.h>
20#elif defined RTE_EXEC_ENV_LINUX
21#include <endian.h>
22#endif
23
24#include <rte_common.h>
25#include <rte_config.h>
26
27/*
28 * Compile-time endianness detection
29 */
30#define RTE_BIG_ENDIAN 1
31#define RTE_LITTLE_ENDIAN 2
32#if defined __BYTE_ORDER__
33#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
34#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
35#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
36#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
37#endif /* __BYTE_ORDER__ */
38#elif defined __BYTE_ORDER
39#if __BYTE_ORDER == __BIG_ENDIAN
40#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
41#elif __BYTE_ORDER == __LITTLE_ENDIAN
42#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
43#endif /* __BYTE_ORDER */
44#elif defined __BIG_ENDIAN__
45#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
46#elif defined __LITTLE_ENDIAN__
47#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
48#endif
49#if !defined(RTE_BYTE_ORDER)
50#error Unknown endianness.
51#endif
52
53#define RTE_STATIC_BSWAP16(v) \
54 ((((uint16_t)(v) & UINT16_C(0x00ff)) << 8) | \
55 (((uint16_t)(v) & UINT16_C(0xff00)) >> 8))
56
57#define RTE_STATIC_BSWAP32(v) \
58 ((((uint32_t)(v) & UINT32_C(0x000000ff)) << 24) | \
59 (((uint32_t)(v) & UINT32_C(0x0000ff00)) << 8) | \
60 (((uint32_t)(v) & UINT32_C(0x00ff0000)) >> 8) | \
61 (((uint32_t)(v) & UINT32_C(0xff000000)) >> 24))
62
63#define RTE_STATIC_BSWAP64(v) \
64 ((((uint64_t)(v) & UINT64_C(0x00000000000000ff)) << 56) | \
65 (((uint64_t)(v) & UINT64_C(0x000000000000ff00)) << 40) | \
66 (((uint64_t)(v) & UINT64_C(0x0000000000ff0000)) << 24) | \
67 (((uint64_t)(v) & UINT64_C(0x00000000ff000000)) << 8) | \
68 (((uint64_t)(v) & UINT64_C(0x000000ff00000000)) >> 8) | \
69 (((uint64_t)(v) & UINT64_C(0x0000ff0000000000)) >> 24) | \
70 (((uint64_t)(v) & UINT64_C(0x00ff000000000000)) >> 40) | \
71 (((uint64_t)(v) & UINT64_C(0xff00000000000000)) >> 56))
72
73/*
74 * These macros are functionally similar to rte_cpu_to_(be|le)(16|32|64)(),
75 * they take values in host CPU order and return them converted to the
76 * intended endianness.
77 *
78 * They resolve at compilation time to integer constants which can safely be
79 * used with static initializers, since those cannot involve function calls.
80 *
81 * On the other hand, they are not as optimized as their rte_cpu_to_*()
82 * counterparts, therefore applications should refrain from using them on
83 * variable values, particularly inside performance-sensitive code.
84 */
85#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
86#define RTE_BE16(v) (rte_be16_t)(v)
87#define RTE_BE32(v) (rte_be32_t)(v)
88#define RTE_BE64(v) (rte_be64_t)(v)
89#define RTE_LE16(v) (rte_le16_t)(RTE_STATIC_BSWAP16(v))
90#define RTE_LE32(v) (rte_le32_t)(RTE_STATIC_BSWAP32(v))
91#define RTE_LE64(v) (rte_le64_t)(RTE_STATIC_BSWAP64(v))
92#elif RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
93#define RTE_BE16(v) (rte_be16_t)(RTE_STATIC_BSWAP16(v))
94#define RTE_BE32(v) (rte_be32_t)(RTE_STATIC_BSWAP32(v))
95#define RTE_BE64(v) (rte_be64_t)(RTE_STATIC_BSWAP64(v))
96#define RTE_LE16(v) (rte_le16_t)(v)
97#define RTE_LE32(v) (rte_le32_t)(v)
98#define RTE_LE64(v) (rte_le64_t)(v)
99#else
100#error Unsupported endianness.
101#endif
102
103/*
104 * The following types should be used when handling values according to a
105 * specific byte ordering, which may differ from that of the host CPU.
106 *
107 * Libraries, public APIs and applications are encouraged to use them for
108 * documentation purposes.
109 */
110typedef uint16_t rte_be16_t;
111typedef uint32_t rte_be32_t;
112typedef uint64_t rte_be64_t;
113typedef uint16_t rte_le16_t;
114typedef uint32_t rte_le32_t;
115typedef uint64_t rte_le64_t;
117/*
118 * An internal function to swap bytes in a 16-bit value.
119 *
120 * It is used by rte_bswap16() when the value is constant. Do not use
121 * this function directly; rte_bswap16() is preferred.
122 */
123static inline uint16_t
124rte_constant_bswap16(uint16_t x)
125{
126 return (uint16_t)RTE_STATIC_BSWAP16(x);
127}
128
129/*
130 * An internal function to swap bytes in a 32-bit value.
131 *
132 * It is used by rte_bswap32() when the value is constant. Do not use
133 * this function directly; rte_bswap32() is preferred.
134 */
135static inline uint32_t
136rte_constant_bswap32(uint32_t x)
137{
138 return (uint32_t)RTE_STATIC_BSWAP32(x);
139}
140
141/*
142 * An internal function to swap bytes of a 64-bit value.
143 *
144 * It is used by rte_bswap64() when the value is constant. Do not use
145 * this function directly; rte_bswap64() is preferred.
146 */
147static inline uint64_t
148rte_constant_bswap64(uint64_t x)
149{
150 return (uint64_t)RTE_STATIC_BSWAP64(x);
151}
152
153
154#ifdef __DOXYGEN__
155
159static uint16_t rte_bswap16(uint16_t _x);
160
164static uint32_t rte_bswap32(uint32_t x);
165
169static uint64_t rte_bswap64(uint64_t x);
170
174static rte_le16_t rte_cpu_to_le_16(uint16_t x);
175
179static rte_le32_t rte_cpu_to_le_32(uint32_t x);
180
184static rte_le64_t rte_cpu_to_le_64(uint64_t x);
185
186
190static rte_be16_t rte_cpu_to_be_16(uint16_t x);
191
195static rte_be32_t rte_cpu_to_be_32(uint32_t x);
196
200static rte_be64_t rte_cpu_to_be_64(uint64_t x);
201
202
206static uint16_t rte_le_to_cpu_16(rte_le16_t x);
207
211static uint32_t rte_le_to_cpu_32(rte_le32_t x);
212
216static uint64_t rte_le_to_cpu_64(rte_le64_t x);
217
218
222static uint16_t rte_be_to_cpu_16(rte_be16_t x);
223
227static uint32_t rte_be_to_cpu_32(rte_be32_t x);
228
232static uint64_t rte_be_to_cpu_64(rte_be64_t x);
233
234#endif /* __DOXYGEN__ */
235
236#ifdef RTE_FORCE_INTRINSICS
237#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
238#define rte_bswap16(x) __builtin_bswap16(x)
239#endif
240
241#define rte_bswap32(x) __builtin_bswap32(x)
242
243#define rte_bswap64(x) __builtin_bswap64(x)
244
245#endif
246
247#endif /* _RTE_BYTEORDER_H_ */
static uint16_t rte_be_to_cpu_16(rte_be16_t x)
static uint32_t rte_be_to_cpu_32(rte_be32_t x)
static uint64_t rte_bswap64(uint64_t x)
static uint16_t rte_le_to_cpu_16(rte_le16_t x)
static uint64_t rte_le_to_cpu_64(rte_le64_t x)
uint32_t rte_le32_t
static rte_be32_t rte_cpu_to_be_32(uint32_t x)
static rte_be16_t rte_cpu_to_be_16(uint16_t x)
static uint64_t rte_be_to_cpu_64(rte_be64_t x)
uint32_t rte_be32_t
static uint16_t rte_bswap16(uint16_t _x)
static rte_le16_t rte_cpu_to_le_16(uint16_t x)
static uint32_t rte_bswap32(uint32_t x)
uint64_t rte_le64_t
uint64_t rte_be64_t
uint16_t rte_le16_t
static rte_be64_t rte_cpu_to_be_64(uint64_t x)
static rte_le32_t rte_cpu_to_le_32(uint32_t x)
static rte_le64_t rte_cpu_to_le_64(uint64_t x)
uint16_t rte_be16_t
static uint32_t rte_le_to_cpu_32(rte_le32_t x)