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generated by cgit v1.2.3 (git 2.25.1) at 2024-08-29 18:52:21 +0000
* ``info.vlen``: 0 * ``type``: the type with ``const`` qualifier No additional type data follow ``btf_type``. 2.2.11 BTF_KIND_RESTRICT ~~~~~~~~~~~~~~~~~~~~~~~~ ``struct btf_type`` encoding requirement: * ``name_off``: 0 * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_RESTRICT * ``info.vlen``: 0 * ``type``: the type with ``restrict`` qualifier No additional type data follow ``btf_type``. 2.2.12 BTF_KIND_FUNC ~~~~~~~~~~~~~~~~~~~~ ``struct btf_type`` encoding requirement: * ``name_off``: offset to a valid C identifier * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_FUNC * ``info.vlen``: 0 * ``type``: a BTF_KIND_FUNC_PROTO type No additional type data follow ``btf_type``. A BTF_KIND_FUNC defines not a type, but a subprogram (function) whose signature is defined by ``type``. The subprogram is thus an instance of that type. The BTF_KIND_FUNC may in turn be referenced by a func_info in the :ref:`BTF_Ext_Section` (ELF) or in the arguments to :ref:`BPF_Prog_Load` (ABI). 2.2.13 BTF_KIND_FUNC_PROTO ~~~~~~~~~~~~~~~~~~~~~~~~~~ ``struct btf_type`` encoding requirement: * ``name_off``: 0 * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_FUNC_PROTO * ``info.vlen``: # of parameters * ``type``: the return type ``btf_type`` is followed by ``info.vlen`` number of ``struct btf_param``.:: struct btf_param { __u32 name_off; __u32 type; }; If a BTF_KIND_FUNC_PROTO type is referred by a BTF_KIND_FUNC type, then ``btf_param.name_off`` must point to a valid C identifier except for the possible last argument representing the variable argument. The btf_param.type refers to parameter type. If the function has variable arguments, the last parameter is encoded with ``name_off = 0`` and ``type = 0``. 2.2.14 BTF_KIND_VAR ~~~~~~~~~~~~~~~~~~~ ``struct btf_type`` encoding requirement: * ``name_off``: offset to a valid C identifier * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_VAR * ``info.vlen``: 0 * ``type``: the type of the variable ``btf_type`` is followed by a single ``struct btf_variable`` with the following data:: struct btf_var { __u32 linkage; }; ``struct btf_var`` encoding: * ``linkage``: currently only static variable 0, or globally allocated variable in ELF sections 1 Not all type of global variables are supported by LLVM at this point. The following is currently available: * static variables with or without section attributes * global variables with section attributes The latter is for future extraction of map key/value type id's from a map definition. 2.2.15 BTF_KIND_DATASEC ~~~~~~~~~~~~~~~~~~~~~~~ ``struct btf_type`` encoding requirement: * ``name_off``: offset to a valid name associated with a variable or one of .data/.bss/.rodata * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_DATASEC * ``info.vlen``: # of variables * ``size``: total section size in bytes (0 at compilation time, patched to actual size by BPF loaders such as libbpf) ``btf_type`` is followed by ``info.vlen`` number of ``struct btf_var_secinfo``.:: struct btf_var_secinfo { __u32 type; __u32 offset; __u32 size; }; ``struct btf_var_secinfo`` encoding: * ``type``: the type of the BTF_KIND_VAR variable * ``offset``: the in-section offset of the variable * ``size``: the size of the variable in bytes 3. BTF Kernel API ***************** The following bpf syscall command involves BTF: * BPF_BTF_LOAD: load a blob of BTF data into kernel * BPF_MAP_CREATE: map creation with btf key and value type info. * BPF_PROG_LOAD: prog load with btf function and line info. * BPF_BTF_GET_FD_BY_ID: get a btf fd * BPF_OBJ_GET_INFO_BY_FD: btf, func_info, line_info and other btf related info are returned. The workflow typically looks like: :: Application: BPF_BTF_LOAD | v BPF_MAP_CREATE and BPF_PROG_LOAD | V ...... Introspection tool: ...... BPF_{PROG,MAP}_GET_NEXT_ID (get prog/map id's) | V BPF_{PROG,MAP}_GET_FD_BY_ID (get a prog/map fd) | V BPF_OBJ_GET_INFO_BY_FD (get bpf_prog_info/bpf_map_info with btf_id)