linux/tools/testing/selftests/bpf/bpf_endian.h

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#ifndef __BPF_ENDIAN__
#define __BPF_ENDIAN__
#include <asm/byteorder.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define __bpf_ntohs(x) __builtin_bswap16(x)
# define __bpf_htons(x) __builtin_bswap16(x)
#elif __BYTE_ORDER == __BIG_ENDIAN
# define __bpf_ntohs(x) (x)
# define __bpf_htons(x) (x)
#else
# error "Fix your __BYTE_ORDER?!"
#endif
#define bpf_htons(x) \
(__builtin_constant_p(x) ? \
__constant_htons(x) : __bpf_htons(x))
#define bpf_ntohs(x) \
(__builtin_constant_p(x) ? \
__constant_ntohs(x) : __bpf_ntohs(x))
#endif