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| author | Yonghong Song <yonghong.song@linux.dev> | 2024-04-02 05:54:46 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2024-04-02 17:14:00 +0300 |
| commit | 965c6167c93f3fac53e25807f83c07e87b3c085a (patch) | |
| tree | 611ec4261565516c148aa485c4517b7af8c179fe | |
| parent | 9dc182c58b5f5d4ac125ac85ad553f7142aa08d4 (diff) | |
| download | linux-965c6167c93f3fac53e25807f83c07e87b3c085a.tar.xz | |
selftests/bpf: Using llvm may_goto inline asm for cond_break macro
Currently, cond_break macro uses bytes to encode the may_goto insn.
Patch [1] in llvm implemented may_goto insn in BPF backend.
Replace byte-level encoding with llvm inline asm for better usability.
Using llvm may_goto insn is controlled by macro __BPF_FEATURE_MAY_GOTO.
[1] https://github.com/llvm/llvm-project/commit/0e0bfacff71859d1f9212205f8f873d47029d3fb
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240402025446.3215182-1-yonghong.song@linux.dev
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_experimental.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h index a5b9df38c162..3329ea080865 100644 --- a/tools/testing/selftests/bpf/bpf_experimental.h +++ b/tools/testing/selftests/bpf/bpf_experimental.h @@ -326,6 +326,16 @@ l_true: \ }) #endif +#ifdef __BPF_FEATURE_MAY_GOTO +#define cond_break \ + ({ __label__ l_break, l_continue; \ + asm volatile goto("may_goto %l[l_break]" \ + :::: l_break); \ + goto l_continue; \ + l_break: break; \ + l_continue:; \ + }) +#else #define cond_break \ ({ __label__ l_break, l_continue; \ asm volatile goto("1:.byte 0xe5; \ @@ -337,6 +347,7 @@ l_true: \ l_break: break; \ l_continue:; \ }) +#endif #ifndef bpf_nop_mov #define bpf_nop_mov(var) \ |