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libbpf: Add support for dynamic program attach target

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Currently when you want to attach a trace program to a bpf program
the section name needs to match the tracepoint/function semantics.

However the addition of the bpf_program__set_attach_target() API
allows you to specify the tracepoint/function dynamically.

The call flow would look something like this:

  xdp_fd = bpf_prog_get_fd_by_id(id);
  trace_obj = bpf_object__open_file("func.o", NULL);
  prog = bpf_object__find_program_by_title(trace_obj,
                                           "fentry/myfunc");
  bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY);
  bpf_program__set_attach_target(prog, xdp_fd,
                                 "xdpfilt_blk_all");
  bpf_object__load(trace_obj)

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/158220519486.127661.7964708960649051384.stgit@xdp-tutorial
This commit is contained in:
Eelco Chaudron
2020-02-20 13:26:35 +00:00
committed by Andrii Nakryiko
parent 36c26f12f1
commit b7c162a433
3 changed files with 36 additions and 4 deletions
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2
src/libbpf.map
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@@ -237,4 +237,6 @@ LIBBPF_0.0.7 {
} LIBBPF_0.0.6;
LIBBPF_0.0.8 {
global:
bpf_program__set_attach_target;
} LIBBPF_0.0.7;