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author | Andrii Nakryiko <andriin@fb.com> | 2020-03-30 06:00:00 +0300 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2020-03-31 03:36:41 +0300 |
commit | cc4f864bb118e0ae7bf9f4e3418eaeb083aa34f2 (patch) | |
tree | c5b57abcdd856f641e0c5d07f3c3bc7ec54e2f15 /tools/lib/bpf/bpf.h | |
parent | 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab (diff) | |
download | linux-cc4f864bb118e0ae7bf9f4e3418eaeb083aa34f2.tar.xz |
libbpf: Add support for bpf_link-based cgroup attachment
Add bpf_program__attach_cgroup(), which uses BPF_LINK_CREATE subcommand to
create an FD-based kernel bpf_link. Also add low-level bpf_link_create() API.
If expected_attach_type is not specified explicitly with
bpf_program__set_expected_attach_type(), libbpf will try to determine proper
attach type from BPF program's section definition.
Also add support for bpf_link's underlying BPF program replacement:
- unconditional through high-level bpf_link__update_program() API;
- cmpxchg-like with specifying expected current BPF program through
low-level bpf_link_update() API.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200330030001.2312810-4-andriin@fb.com
Diffstat (limited to 'tools/lib/bpf/bpf.h')
-rw-r--r-- | tools/lib/bpf/bpf.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index b976e77316cc..46d47afdd887 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -168,6 +168,25 @@ LIBBPF_API int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type); LIBBPF_API int bpf_prog_detach2(int prog_fd, int attachable_fd, enum bpf_attach_type type); +struct bpf_link_create_opts { + size_t sz; /* size of this struct for forward/backward compatibility */ +}; +#define bpf_link_create_opts__last_field sz + +LIBBPF_API int bpf_link_create(int prog_fd, int target_fd, + enum bpf_attach_type attach_type, + const struct bpf_link_create_opts *opts); + +struct bpf_link_update_opts { + size_t sz; /* size of this struct for forward/backward compatibility */ + __u32 flags; /* extra flags */ + __u32 old_prog_fd; /* expected old program FD */ +}; +#define bpf_link_update_opts__last_field old_prog_fd + +LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd, + const struct bpf_link_update_opts *opts); + struct bpf_prog_test_run_attr { int prog_fd; int repeat; |