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selftests/bpf: Using llvm may_goto inline asm for cond_break macro

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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] 0e0bfacff7

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
This commit is contained in:
Yonghong Song 2024-04-01 19:54:46 -07:00 committed by Daniel Borkmann
parent 9dc182c58b
commit 965c6167c9
1 changed files with 11 additions and 0 deletions
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11
tools/testing/selftests/bpf/bpf_experimental.h
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@ -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) \