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Date: Sun, 9 Aug 2020 17:02:59 +0200 From: Jiri Olsa <jolsa@...nel.org> To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andriin@...com> Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>, David Miller <davem@...hat.com>, John Fastabend <john.fastabend@...il.com>, Wenbo Zhang <ethercflow@...il.com>, KP Singh <kpsingh@...omium.org>, Brendan Gregg <bgregg@...flix.com>, Florent Revest <revest@...omium.org>, Al Viro <viro@...iv.linux.org.uk> Subject: [RFC PATCH v11 bpf-next 11/14] bpf: Update .BTF_ids section in btf.rst with sets info Updating btf.rst doc with info about BTF_SET_START/END macros. Acked-by: Andrii Nakryiko <andriin@...com> Signed-off-by: Jiri Olsa <jolsa@...nel.org> --- Documentation/bpf/btf.rst | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst index b5361b8621c9..44dc789de2b4 100644 --- a/Documentation/bpf/btf.rst +++ b/Documentation/bpf/btf.rst @@ -724,6 +724,31 @@ want to define unused entry in BTF_ID_LIST, like:: BTF_ID_UNUSED BTF_ID(struct, task_struct) +The ``BTF_SET_START/END`` macros pair defines sorted list of BTF ID values +and their count, with following syntax:: + + BTF_SET_START(set) + BTF_ID(type1, name1) + BTF_ID(type2, name2) + BTF_SET_END(set) + +resulting in following layout in .BTF_ids section:: + + __BTF_ID__set__set: + .zero 4 + __BTF_ID__type1__name1__3: + .zero 4 + __BTF_ID__type2__name2__4: + .zero 4 + +The ``struct btf_id_set set;`` variable is defined to access the list. + +The ``typeX`` name can be one of following:: + + struct, union, typedef, func + +and is used as a filter when resolving the BTF ID value. + All the BTF ID lists and sets are compiled in the .BTF_ids section and resolved during the linking phase of kernel build by ``resolve_btfids`` tool. -- 2.25.4
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