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Message-ID: <03bf6aafe30def690c63e454d76e733f27dff4b3.1769157382.git.zhuhui@kylinos.cn>
Date: Fri, 23 Jan 2026 16:57:59 +0800
From: Hui Zhu <hui.zhu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Shakeel Butt <shakeel.butt@...ux.dev>,
Muchun Song <muchun.song@...ux.dev>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>,
Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...ichev.me>,
Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>,
Shuah Khan <shuah@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Miguel Ojeda <ojeda@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Kees Cook <kees@...nel.org>,
Tejun Heo <tj@...nel.org>,
Jeff Xu <jeffxu@...omium.org>,
mkoutny@...e.com,
Jan Hendrik Farr <kernel@...rr.cc>,
Christian Brauner <brauner@...nel.org>,
Randy Dunlap <rdunlap@...radead.org>,
Brian Gerst <brgerst@...il.com>,
Masahiro Yamada <masahiroy@...nel.org>,
davem@...emloft.net,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
JP Kobryn <inwardvessel@...il.com>,
Willem de Bruijn <willemb@...gle.com>,
Jason Xing <kerneljasonxing@...il.com>,
Paul Chaignon <paul.chaignon@...il.com>,
Anton Protopopov <a.s.protopopov@...il.com>,
Amery Hung <ameryhung@...il.com>,
Chen Ridong <chenridong@...weicloud.com>,
Lance Yang <lance.yang@...ux.dev>,
Jiayuan Chen <jiayuan.chen@...ux.dev>,
linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
cgroups@...r.kernel.org,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [RFC PATCH bpf-next v3 05/12] libbpf: introduce bpf_map__attach_struct_ops_opts()
From: Roman Gushchin <roman.gushchin@...ux.dev>
Introduce bpf_map__attach_struct_ops_opts(), an extended version of
bpf_map__attach_struct_ops(), which takes additional struct
bpf_struct_ops_opts argument.
struct bpf_struct_ops_opts has the relative_fd member, which allows
to pass an additional file descriptor argument. It can be used to
attach struct ops maps to cgroups.
Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
tools/lib/bpf/bpf.c | 8 ++++++++
tools/lib/bpf/libbpf.c | 18 ++++++++++++++++--
tools/lib/bpf/libbpf.h | 14 ++++++++++++++
tools/lib/bpf/libbpf.map | 2 +-
4 files changed, 39 insertions(+), 3 deletions(-)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 21b57a629916..a2833a50a509 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -883,6 +883,14 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, cgroup))
return libbpf_err(-EINVAL);
break;
+ case BPF_STRUCT_OPS:
+ relative_fd = OPTS_GET(opts, cgroup.relative_fd, 0);
+ attr.link_create.cgroup.relative_fd = relative_fd;
+ attr.link_create.cgroup.expected_revision =
+ OPTS_GET(opts, cgroup.expected_revision, 0);
+ if (!OPTS_ZEROED(opts, cgroup))
+ return libbpf_err(-EINVAL);
+ break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index bbcfd72b07d5..37eb4f96b28e 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -13459,12 +13459,19 @@ static int bpf_link__detach_struct_ops(struct bpf_link *link)
return close(link->fd);
}
-struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map)
+struct bpf_link *bpf_map__attach_struct_ops_opts(const struct bpf_map *map,
+ const struct bpf_struct_ops_opts *opts)
{
+ DECLARE_LIBBPF_OPTS(bpf_link_create_opts, link_opts);
struct bpf_link_struct_ops *link;
__u32 zero = 0;
int err, fd;
+ if (!OPTS_VALID(opts, bpf_struct_ops_opts)) {
+ pr_warn("map '%s': invalid opts\n", map->name);
+ return libbpf_err_ptr(-EINVAL);
+ }
+
if (!bpf_map__is_struct_ops(map)) {
pr_warn("map '%s': can't attach non-struct_ops map\n", map->name);
return libbpf_err_ptr(-EINVAL);
@@ -13500,7 +13507,9 @@ struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map)
return &link->link;
}
- fd = bpf_link_create(map->fd, 0, BPF_STRUCT_OPS, NULL);
+ link_opts.cgroup.relative_fd = OPTS_GET(opts, relative_fd, 0);
+
+ fd = bpf_link_create(map->fd, 0, BPF_STRUCT_OPS, &link_opts);
if (fd < 0) {
free(link);
return libbpf_err_ptr(fd);
@@ -13512,6 +13521,11 @@ struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map)
return &link->link;
}
+struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map)
+{
+ return bpf_map__attach_struct_ops_opts(map, NULL);
+}
+
/*
* Swap the back struct_ops of a link with a new struct_ops map.
*/
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index dfc37a615578..5aef44bcfcc2 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -920,6 +920,20 @@ bpf_program__attach_cgroup_opts(const struct bpf_program *prog, int cgroup_fd,
struct bpf_map;
LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map);
+
+struct bpf_struct_ops_opts {
+ /* size of this struct, for forward/backward compatibility */
+ size_t sz;
+ __u32 flags;
+ __u32 relative_fd;
+ __u64 expected_revision;
+ size_t :0;
+};
+#define bpf_struct_ops_opts__last_field expected_revision
+
+LIBBPF_API struct bpf_link *
+bpf_map__attach_struct_ops_opts(const struct bpf_map *map,
+ const struct bpf_struct_ops_opts *opts);
LIBBPF_API int bpf_link__update_map(struct bpf_link *link, const struct bpf_map *map);
struct bpf_iter_attach_opts {
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index d18fbcea7578..2bf514462045 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -453,5 +453,5 @@ LIBBPF_1.7.0 {
bpf_map__exclusive_program;
bpf_prog_assoc_struct_ops;
bpf_program__assoc_struct_ops;
- btf__permute;
+ bpf_map__attach_struct_ops_opts;
} LIBBPF_1.6.0;
--
2.43.0
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