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libbpf: Support attachment of BPF tracing programs to kernel modules

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Teach libbpf to search for BTF types in kernel modules for tracing BPF
programs. This allows attachment of raw_tp/fentry/fexit/fmod_ret/etc BPF
program types to tracepoints and functions in kernel modules.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-13-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2020-12-03 12:46:32 -08:00
committed by Andrii Nakryiko
parent a1fd6dab54
commit d95b12da56
3 changed files with 112 additions and 32 deletions
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5
src/bpf.c
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@@ -231,8 +231,11 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr)
attr.prog_type = load_attr->prog_type;
attr.expected_attach_type = load_attr->expected_attach_type;
if (load_attr->attach_prog_fd)
attr.attach_prog_fd = load_attr->attach_prog_fd;
else
attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd;
attr.attach_btf_id = load_attr->attach_btf_id;
attr.attach_prog_fd = load_attr->attach_prog_fd;
attr.prog_ifindex = load_attr->prog_ifindex;
attr.kern_version = load_attr->kern_version;