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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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18
src/libbpf.h
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@@ -978,6 +978,23 @@ bpf_object__prev_map(const struct bpf_object *obj, const struct bpf_map *map);
LIBBPF_API int bpf_map__set_autocreate(struct bpf_map *map, bool autocreate);
LIBBPF_API bool bpf_map__autocreate(const struct bpf_map *map);
/**
* @brief **bpf_map__set_autoattach()** sets whether libbpf has to auto-attach
* map during BPF skeleton attach phase.
* @param map the BPF map instance
* @param autoattach whether to attach map during BPF skeleton attach phase
* @return 0 on success; negative error code, otherwise
*/
LIBBPF_API int bpf_map__set_autoattach(struct bpf_map *map, bool autoattach);
/**
* @brief **bpf_map__autoattach()** returns whether BPF map is configured to
* auto-attach during BPF skeleton attach phase.
* @param map the BPF map instance
* @return true if map is set to auto-attach during skeleton attach phase; false, otherwise
*/
LIBBPF_API bool bpf_map__autoattach(const struct bpf_map *map);
/**
* @brief **bpf_map__fd()** gets the file descriptor of the passed
* BPF map
@@ -1672,6 +1689,7 @@ struct bpf_map_skeleton {
const char *name;
struct bpf_map **map;
void **mmaped;
struct bpf_link **link;
};
struct bpf_prog_skeleton {