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libbpf-tools: Add experimental BTFGen integration #3889

Merged
merged 4 commits into from
Apr 7, 2022
Merged

libbpf-tools: Add experimental BTFGen integration #3889

merged 4 commits into from
Apr 7, 2022

Commits on Apr 6, 2022

  1. libbpf-tools: Include bpftool as a submodule 

    bpftool now has a mirror on Github[0], let's pull it as a submodule
and compile when needed instead of shipping the bpftool binary directly.

[0]: https://github.com/libbpf/bpftool

Signed-off-by: Mauricio Vásquez <[email protected]
    @mauriciovasquezbernal
    mauriciovasquezbernal committed Apr 6, 2022
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  2. libbpf-tools: Add experimental integration with BTFGen 

    This commit adds an experimental BTFGen[0] integration to allow some of
the libbpf-tools to run in systems that don't provide BTF information.

The whole process consist of two parts: (1) generating and embedding the
BTF file within the tools binary and (2) using those when the tool is
run.

The first part is done by using the Makefile, it generates the reduced
BTF files for the different eBPF objects of the tools, those files are
then compressed and a C header file with its content is created.

The second part is handled by a new C file that provides the logic to
uncompress and save the BTF file according to the Linux distribution and
kernel version where the tools is being run.

[0] https://lore.kernel.org/bpf/[email protected]/

Signed-off-by: Mauricio Vásquez <[email protected]>
    @mauriciovasquezbernal
    mauriciovasquezbernal committed Apr 6, 2022
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  3. libbpf-tools: Update tools to use BTFGen integration 

    Use save_min_core_btf() to uncompress and save the BTF file for the
current system. If the file is available, then use it when opening the
object.

Signed-off-by: Mauricio Vásquez <[email protected]>
    @mauriciovasquezbernal
    mauriciovasquezbernal committed Apr 6, 2022
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  4. libbpf-tools: Add documentation about BTFGen integration 

    Signed-off-by: Mauricio Vásquez <[email protected]>
    @mauriciovasquezbernal
    mauriciovasquezbernal committed Apr 6, 2022
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