diff options
| author | Yonghong Song <yhs@fb.com> | 2021-09-14 15:30:58 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-09-14 18:45:53 -0700 |
| commit | c240ba28789063690077d282f8f89e03f31037d0 (patch) | |
| tree | afa3da15601872f73bf36ec456938e2a60b65034 /tools/testing/selftests/bpf/prog_tests | |
| parent | ad526474aec1d9abb9838e3fb1330bb991715c22 (diff) | |
selftests/bpf: Add a test with a bpf program with btf_tag attributes
Add a bpf program with btf_tag attributes. The program is
loaded successfully with the kernel. With the command
bpftool btf dump file ./tag.o
the following dump shows that tags are properly encoded:
[8] STRUCT 'key_t' size=12 vlen=3
'a' type_id=2 bits_offset=0
'b' type_id=2 bits_offset=32
'c' type_id=2 bits_offset=64
[9] TAG 'tag1' type_id=8 component_id=-1
[10] TAG 'tag2' type_id=8 component_id=-1
[11] TAG 'tag1' type_id=8 component_id=1
[12] TAG 'tag2' type_id=8 component_id=1
...
[21] FUNC_PROTO '(anon)' ret_type_id=2 vlen=1
'x' type_id=2
[22] FUNC 'foo' type_id=21 linkage=static
[23] TAG 'tag1' type_id=22 component_id=0
[24] TAG 'tag2' type_id=22 component_id=0
[25] TAG 'tag1' type_id=22 component_id=-1
[26] TAG 'tag2' type_id=22 component_id=-1
...
[29] VAR 'total' type_id=27, linkage=global
[30] TAG 'tag1' type_id=29 component_id=-1
[31] TAG 'tag2' type_id=29 component_id=-1
If an old clang compiler, which does not support btf_tag attribute,
is used, these btf_tag attributes will be silently ignored.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210914223058.248949-1-yhs@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/btf_tag.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/btf_tag.c b/tools/testing/selftests/bpf/prog_tests/btf_tag.c new file mode 100644 index 000000000000..f939527ede77 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_tag.c @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2021 Facebook */ +#include <test_progs.h> +#include "tag.skel.h" + +void test_btf_tag(void) +{ + struct tag *skel; + + skel = tag__open_and_load(); + if (!ASSERT_OK_PTR(skel, "btf_tag")) + return; + tag__destroy(skel); +} |