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| author | Yonghong Song <yhs@fb.com> | 2021-11-11 17:26:56 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-11-11 17:41:11 -0800 |
| commit | d52f5c639dd8605d2563b77b190e278f615a2b8a (patch) | |
| tree | 6a8410367d37d8b76451a9f35e2f0b9565f8c557 /Documentation/bpf | |
| parent | 3f1d0dc0ba290aab357083a0abfe267c8cffdc8d (diff) | |
| download | lwn-d52f5c639dd8605d2563b77b190e278f615a2b8a.tar.gz lwn-d52f5c639dd8605d2563b77b190e278f615a2b8a.zip | |
docs/bpf: Update documentation for BTF_KIND_TYPE_TAG support
Add BTF_KIND_TYPE_TAG documentation in btf.rst.
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/20211112012656.1509082-1-yhs@fb.com
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/btf.rst | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst index 9ad4218a751f..d0ec40d00c28 100644 --- a/Documentation/bpf/btf.rst +++ b/Documentation/bpf/btf.rst @@ -86,6 +86,7 @@ sequentially and type id is assigned to each recognized type starting from id #define BTF_KIND_DATASEC 15 /* Section */ #define BTF_KIND_FLOAT 16 /* Floating point */ #define BTF_KIND_DECL_TAG 17 /* Decl Tag */ + #define BTF_KIND_TYPE_TAG 18 /* Type Tag */ Note that the type section encodes debug info, not just pure types. ``BTF_KIND_FUNC`` is not a type, and it represents a defined subprogram. @@ -107,7 +108,7 @@ Each type contains the following common data:: * "size" tells the size of the type it is describing. * * "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT, - * FUNC, FUNC_PROTO and DECL_TAG. + * FUNC, FUNC_PROTO, DECL_TAG and TYPE_TAG. * "type" is a type_id referring to another type. */ union { @@ -492,6 +493,16 @@ the attribute is applied to a ``struct``/``union`` member or a ``func`` argument, and ``btf_decl_tag.component_idx`` should be a valid index (starting from 0) pointing to a member or an argument. +2.2.17 BTF_KIND_TYPE_TAG +~~~~~~~~~~~~~~~~~~~~~~~~ + +``struct btf_type`` encoding requirement: + * ``name_off``: offset to a non-empty string + * ``info.kind_flag``: 0 + * ``info.kind``: BTF_KIND_TYPE_TAG + * ``info.vlen``: 0 + * ``type``: the type with ``btf_type_tag`` attribute + 3. BTF Kernel API ***************** |