libbpf: Find correct module BTFs for struct_ops maps and progs.

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Locate the module BTFs for struct_ops maps and progs and pass them to the
kernel. This ensures that the kernel correctly resolves type IDs from the
appropriate module BTFs.

For the map of a struct_ops object, the FD of the module BTF is set to
bpf_map to keep a reference to the module BTF. The FD is passed to the
kernel as value_type_btf_obj_fd when the struct_ops object is loaded.

For a bpf_struct_ops prog, attach_btf_obj_fd of bpf_prog is the FD of a
module BTF in the kernel.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240119225005.668602-13-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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Kui-Feng Lee 2024-01-19 14:50:03 -08:00 • committed by Martin KaFai Lau

parent f6be98d199

commit 9e926acda0

4 changed files with 38 additions and 12 deletions

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4

tools/lib/bpf/bpf.c

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4

tools/lib/bpf/bpf.h

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41

tools/lib/bpf/libbpf.c

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1

tools/lib/bpf/libbpf_probes.c

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