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libbpf: Auto-attach struct_ops BPF maps in BPF skeleton

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Similarly to `bpf_program`, support `bpf_map` automatic attachment in
`bpf_object__attach_skeleton`. Currently only struct_ops maps could be
attached.

On bpftool side, code-generate links in skeleton struct for struct_ops maps.
Similarly to `bpf_program_skeleton`, set links in `bpf_map_skeleton`.

On libbpf side, extend `bpf_map` with new `autoattach` field to support
enabling or disabling autoattach functionality, introducing
getter/setter for this field.

`bpf_object__(attach|detach)_skeleton` is extended with
attaching/detaching struct_ops maps logic.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240605175135.117127-1-yatsenko@meta.com
This commit is contained in:
Mykyta Yatsenko
2024-06-05 18:51:35 +01:00
committed by Andrii Nakryiko
parent 78c78e90cd
commit be998aa3d4
3 changed files with 81 additions and 3 deletions
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src/libbpf.map
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@@ -419,6 +419,8 @@ LIBBPF_1.4.0 {
LIBBPF_1.5.0 {
global:
bpf_map__autoattach;
bpf_map__set_autoattach;
bpf_program__attach_sockmap;
ring__consume_n;
ring_buffer__consume_n;