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bpf: add support for BTF_KIND_DECL_TAG typedef #1974

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wants to merge 6 commits into from
Closed

bpf: add support for BTF_KIND_DECL_TAG typedef #1974

wants to merge 6 commits into from

Commits on Oct 23, 2021

  1. adding ci files

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  2. bpf: add BTF_KIND_DECL_TAG typedef support 

    The llvm patches ([1], [2]) added support to attach btf_decl_tag
attributes to typedef declarations. This patch added
support in kernel.

  [1] https://reviews.llvm.org/D110127
  [2] https://reviews.llvm.org/D112259

Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song authored and Nobody committed Oct 23, 2021
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  3. selftests/bpf: add BTF_KIND_DECL_TAG typedef unit tests 

    Test good and bad variants of typedef BTF_KIND_DECL_TAG encoding.

Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song authored and Nobody committed Oct 23, 2021
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  4. selftests/bpf: test deduplication for BTF_KIND_DECL_TAG typedef 

    Add unit tests for deduplication of BTF_KIND_DECL_TAG to typedef types.
Also changed a few comments from "tag" to "decl_tag" to match
BTF_KIND_DECL_TAG enum value name.

Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song authored and Nobody committed Oct 23, 2021
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  5. selftests/bpf: add BTF_KIND_DECL_TAG typedef example in tag.c 

    Change value type in progs/tag.c to a typedef with a btf_decl_tag.
With `bpftool btf dump file tag.o`, we have
  ...
  [14] TYPEDEF 'value_t' type_id=17
  [15] DECL_TAG 'tag1' type_id=14 component_idx=-1
  [16] DECL_TAG 'tag2' type_id=14 component_idx=-1
  [17] STRUCT '(anon)' size=8 vlen=2
        'a' type_id=2 bits_offset=0
        'b' type_id=2 bits_offset=32
  ...

The btf_tag selftest also succeeded:
  $ ./test_progs -t tag
    #21 btf_tag:OK
    Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song authored and Nobody committed Oct 23, 2021
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  6. docs/bpf: update documentation for BTF_KIND_DECL_TAG typedef support 

    Add BTF_KIND_DECL_TAG typedef support in btf.rst.

Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song authored and Nobody committed Oct 23, 2021
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