#elif defined __LITTLE_ENDIAN__
#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
#endif
+#if !defined(RTE_BYTE_ORDER)
+#error Unknown endianness.
+#endif
+
+#define RTE_STATIC_BSWAP16(v) \
+ ((((uint16_t)(v) & UINT16_C(0x00ff)) << 8) | \
+ (((uint16_t)(v) & UINT16_C(0xff00)) >> 8))
+
+#define RTE_STATIC_BSWAP32(v) \
+ ((((uint32_t)(v) & UINT32_C(0x000000ff)) << 24) | \
+ (((uint32_t)(v) & UINT32_C(0x0000ff00)) << 8) | \
+ (((uint32_t)(v) & UINT32_C(0x00ff0000)) >> 8) | \
+ (((uint32_t)(v) & UINT32_C(0xff000000)) >> 24))
+
+#define RTE_STATIC_BSWAP64(v) \
+ ((((uint64_t)(v) & UINT64_C(0x00000000000000ff)) << 56) | \
+ (((uint64_t)(v) & UINT64_C(0x000000000000ff00)) << 40) | \
+ (((uint64_t)(v) & UINT64_C(0x0000000000ff0000)) << 24) | \
+ (((uint64_t)(v) & UINT64_C(0x00000000ff000000)) << 8) | \
+ (((uint64_t)(v) & UINT64_C(0x000000ff00000000)) >> 8) | \
+ (((uint64_t)(v) & UINT64_C(0x0000ff0000000000)) >> 24) | \
+ (((uint64_t)(v) & UINT64_C(0x00ff000000000000)) >> 40) | \
+ (((uint64_t)(v) & UINT64_C(0xff00000000000000)) >> 56))
+
+/*
+ * These macros are functionally similar to rte_cpu_to_(be|le)(16|32|64)(),
+ * they take values in host CPU order and return them converted to the
+ * intended endianness.
+ *
+ * They resolve at compilation time to integer constants which can safely be
+ * used with static initializers, since those cannot involve function calls.
+ *
+ * On the other hand, they are not as optimized as their rte_cpu_to_*()
+ * counterparts, therefore applications should refrain from using them on
+ * variable values, particularly inside performance-sensitive code.
+ */
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+#define RTE_BE16(v) (rte_be16_t)(v)
+#define RTE_BE32(v) (rte_be32_t)(v)
+#define RTE_BE64(v) (rte_be64_t)(v)
+#define RTE_LE16(v) (rte_le16_t)(RTE_STATIC_BSWAP16(v))
+#define RTE_LE32(v) (rte_le32_t)(RTE_STATIC_BSWAP32(v))
+#define RTE_LE64(v) (rte_le64_t)(RTE_STATIC_BSWAP64(v))
+#elif RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
+#define RTE_BE16(v) (rte_be16_t)(RTE_STATIC_BSWAP16(v))
+#define RTE_BE32(v) (rte_be32_t)(RTE_STATIC_BSWAP32(v))
+#define RTE_BE64(v) (rte_be64_t)(RTE_STATIC_BSWAP64(v))
+#define RTE_LE16(v) (rte_be16_t)(v)
+#define RTE_LE32(v) (rte_be32_t)(v)
+#define RTE_LE64(v) (rte_be64_t)(v)
+#else
+#error Unsupported endianness.
+#endif
+
+/*
+ * The following types should be used when handling values according to a
+ * specific byte ordering, which may differ from that of the host CPU.
+ *
+ * Libraries, public APIs and applications are encouraged to use them for
+ * documentation purposes.
+ */
+typedef uint16_t rte_be16_t; /**< 16-bit big-endian value. */
+typedef uint32_t rte_be32_t; /**< 32-bit big-endian value. */
+typedef uint64_t rte_be64_t; /**< 64-bit big-endian value. */
+typedef uint16_t rte_le16_t; /**< 16-bit little-endian value. */
+typedef uint32_t rte_le32_t; /**< 32-bit little-endian value. */
+typedef uint64_t rte_le64_t; /**< 64-bit little-endian value. */
/*
* An internal function to swap bytes in a 16-bit value.
static inline uint16_t
rte_constant_bswap16(uint16_t x)
{
- return (uint16_t)(((x & 0x00ffU) << 8) |
- ((x & 0xff00U) >> 8));
+ return RTE_STATIC_BSWAP16(x);
}
/*
static inline uint32_t
rte_constant_bswap32(uint32_t x)
{
- return ((x & 0x000000ffUL) << 24) |
- ((x & 0x0000ff00UL) << 8) |
- ((x & 0x00ff0000UL) >> 8) |
- ((x & 0xff000000UL) >> 24);
+ return RTE_STATIC_BSWAP32(x);
}
/*
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);
+ return RTE_STATIC_BSWAP64(x);
}
/**
* Convert a 16-bit value from CPU order to little endian.
*/
-static uint16_t rte_cpu_to_le_16(uint16_t x);
+static rte_le16_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);
+static rte_le32_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);
+static rte_le64_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);
+static rte_be16_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);
+static rte_be32_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);
+static rte_be64_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);
+static uint16_t rte_le_to_cpu_16(rte_le16_t x);
/**
* Convert a 32-bit value from little endian to CPU order.
*/
-static uint32_t rte_le_to_cpu_32(uint32_t x);
+static uint32_t rte_le_to_cpu_32(rte_le32_t x);
/**
* Convert a 64-bit value from little endian to CPU order.
*/
-static uint64_t rte_le_to_cpu_64(uint64_t x);
+static uint64_t rte_le_to_cpu_64(rte_le64_t x);
/**
* Convert a 16-bit value from big endian to CPU order.
*/
-static uint16_t rte_be_to_cpu_16(uint16_t x);
+static uint16_t rte_be_to_cpu_16(rte_be16_t x);
/**
* Convert a 32-bit value from big endian to CPU order.
*/
-static uint32_t rte_be_to_cpu_32(uint32_t x);
+static uint32_t rte_be_to_cpu_32(rte_be32_t x);
/**
* Convert a 64-bit value from big endian to CPU order.
*/
-static uint64_t rte_be_to_cpu_64(uint64_t x);
+static uint64_t rte_be_to_cpu_64(rte_be64_t x);
#endif /* __DOXYGEN__ */
Code Review / deb_dpdk.git / blobdiff