From: Hui Zhu <[email protected]> Building on the previous change that added flags to the kernel's link creation path, this patch exposes this functionality through libbpf.
The `bpf_struct_ops_opts` struct is extended with a `flags` member, which is then passed to the `bpf_link_create` syscall within `bpf_map__attach_struct_ops_opts`. This enables userspace applications to pass flags, such as `BPF_F_ALLOW_OVERRIDE`, when attaching struct_ops to cgroups, providing more control over the attachment behavior in nested hierarchies. Signed-off-by: Geliang Tang <[email protected]> Signed-off-by: Hui Zhu <[email protected]> --- tools/lib/bpf/libbpf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 37eb4f96b28e..089bd1325468 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -13508,6 +13508,7 @@ struct bpf_link *bpf_map__attach_struct_ops_opts(const struct bpf_map *map, } link_opts.cgroup.relative_fd = OPTS_GET(opts, relative_fd, 0); + link_opts.flags = OPTS_GET(opts, flags, 0); fd = bpf_link_create(map->fd, 0, BPF_STRUCT_OPS, &link_opts); if (fd < 0) { -- 2.43.0
