projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| bc1bafbb DM |
2 | #ifndef __BPF_ENDIAN__ |
| 3 | #define __BPF_ENDIAN__ | |
| 4 | ||
| 78a5a93c | 5 | #include <linux/swab.h> |
| bc1bafbb | 6 | |
| 78a5a93c DB |
7 | /* LLVM's BPF target selects the endianness of the CPU |
| 8 | * it compiles on, or the user specifies (bpfel/bpfeb), | |
| 9 | * respectively. The used __BYTE_ORDER__ is defined by | |
| 10 | * the compiler, we cannot rely on __BYTE_ORDER from | |
| 11 | * libc headers, since it doesn't reflect the actual | |
| 12 | * requested byte order. | |
| 13 | * | |
| 14 | * Note, LLVM's BPF target has different __builtin_bswapX() | |
| 15 | * semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE | |
| 16 | * in bpfel and bpfeb case, which means below, that we map | |
| 17 | * to cpu_to_be16(). We could use it unconditionally in BPF | |
| 18 | * case, but better not rely on it, so that this header here | |
| 19 | * can be used from application and BPF program side, which | |
| 20 | * use different targets. | |
| 21 | */ | |
| 22 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
| 23 | # define __bpf_ntohs(x) __builtin_bswap16(x) | |
| 24 | # define __bpf_htons(x) __builtin_bswap16(x) | |
| 25 | # define __bpf_constant_ntohs(x) ___constant_swab16(x) | |
| 26 | # define __bpf_constant_htons(x) ___constant_swab16(x) | |
| 53335022 YS |
27 | # define __bpf_ntohl(x) __builtin_bswap32(x) |
| 28 | # define __bpf_htonl(x) __builtin_bswap32(x) | |
| 29 | # define __bpf_constant_ntohl(x) ___constant_swab32(x) | |
| 30 | # define __bpf_constant_htonl(x) ___constant_swab32(x) | |
| 78a5a93c DB |
31 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| 32 | # define __bpf_ntohs(x) (x) | |
| 33 | # define __bpf_htons(x) (x) | |
| 34 | # define __bpf_constant_ntohs(x) (x) | |
| 35 | # define __bpf_constant_htons(x) (x) | |
| 53335022 YS |
36 | # define __bpf_ntohl(x) (x) |
| 37 | # define __bpf_htonl(x) (x) | |
| 38 | # define __bpf_constant_ntohl(x) (x) | |
| 39 | # define __bpf_constant_htonl(x) (x) | |
| bc1bafbb | 40 | #else |
| 78a5a93c | 41 | # error "Fix your compiler's __BYTE_ORDER__?!" |
| bc1bafbb DM |
42 | #endif |
| 43 | ||
| 44 | #define bpf_htons(x) \ | |
| 45 | (__builtin_constant_p(x) ? \ | |
| 78a5a93c | 46 | __bpf_constant_htons(x) : __bpf_htons(x)) |
| bc1bafbb DM |
47 | #define bpf_ntohs(x) \ |
| 48 | (__builtin_constant_p(x) ? \ | |
| 78a5a93c | 49 | __bpf_constant_ntohs(x) : __bpf_ntohs(x)) |
| 53335022 YS |
50 | #define bpf_htonl(x) \ |
| 51 | (__builtin_constant_p(x) ? \ | |
| 52 | __bpf_constant_htonl(x) : __bpf_htonl(x)) | |
| 53 | #define bpf_ntohl(x) \ | |
| 54 | (__builtin_constant_p(x) ? \ | |
| 55 | __bpf_constant_ntohl(x) : __bpf_ntohl(x)) | |
| bc1bafbb | 56 | |
| 78a5a93c | 57 | #endif /* __BPF_ENDIAN__ */ |