On Tue, Sep 7, 2021 at 4:01 PM Yonghong Song <yhs@xxxxxx> wrote: > > 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, comp_id=-1 > [10] TAG 'tag2' type_id=8, comp_id=-1 > [11] TAG 'tag1' type_id=8, comp_id=1 > [12] TAG 'tag2' type_id=8, comp_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, comp_id=0 > [24] TAG 'tag2' type_id=22, comp_id=0 > [25] TAG 'tag1' type_id=22, comp_id=-1 > [26] TAG 'tag2' type_id=22, comp_id=-1 > ... > [29] VAR 'total' type_id=27, linkage=global > [30] TAG 'tag1' type_id=29, comp_id=-1 > [31] TAG 'tag2' type_id=29, comp_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@xxxxxx> > --- LGTM. Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > .../selftests/bpf/prog_tests/btf_tag.c | 14 +++++++ > tools/testing/selftests/bpf/progs/tag.c | 39 +++++++++++++++++++ > 2 files changed, 53 insertions(+) > create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_tag.c > create mode 100644 tools/testing/selftests/bpf/progs/tag.c > [...]
