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libbpf: Add bpf_cookie support to bpf_link_create() API

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Add ability to specify bpf_cookie value when creating BPF perf link with
bpf_link_create() low-level API.

Given BPF_LINK_CREATE command is growing and keeps getting new fields that are
specific to the type of BPF_LINK, extend libbpf side of bpf_link_create() API
and corresponding OPTS struct to accomodate such changes. Add extra checks to
prevent using incompatible/unexpected combinations of fields.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210815070609.987780-11-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2021-08-15 00:06:03 -07:00
committed by Andrii Nakryiko
parent d23679b415
commit a3f8c5a306
3 changed files with 54 additions and 18 deletions
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8
src/bpf.h
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@@ -177,8 +177,14 @@ struct bpf_link_create_opts {
union bpf_iter_link_info *iter_info;
__u32 iter_info_len;
__u32 target_btf_id;
union {
struct {
__u64 bpf_cookie;
} perf_event;
};
size_t :0;
};
#define bpf_link_create_opts__last_field target_btf_id
#define bpf_link_create_opts__last_field perf_event
LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,