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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769418358; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=li2p2tnFJJjJ5INNx6uZKzhFQ5sqAQSEauna4Y+cr5o=; b=nhoZcECCwGjpkvlB0XDUMiiT/3p24XMdQu72shwwcl/4SxBv63js7lYNeTcl601Ge8RwH6 JQbnu8HSmWdzuFcWDoKaOiTHAMoyMCrqaPcJ7TPCm3+Tj++MB2Iap6lHrgC+Wg7N4bsrqf cmeLrz3N1x4sSM6ZS41Sfyc7IpNbUhk= From: Hui Zhu To: Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Peter Zijlstra , Miguel Ojeda , Nathan Chancellor , Kees Cook , Tejun Heo , Jeff Xu , mkoutny@suse.com, Jan Hendrik Farr , Christian Brauner , Randy Dunlap , Brian Gerst , Masahiro Yamada , davem@davemloft.net, Jakub Kicinski , Jesper Dangaard Brouer , JP Kobryn , Willem de Bruijn , Jason Xing , Paul Chaignon , Anton Protopopov , Amery Hung , Chen Ridong , Lance Yang , Jiayuan Chen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Hui Zhu , Geliang Tang Subject: [RFC PATCH bpf-next v4 07/12] libbpf: Support passing user-defined flags for struct_ops Date: Mon, 26 Jan 2026 17:04:50 +0800 Message-ID: <63d543aec9ade803afcd95461e3089e3d44caca6.1769417588.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Stat-Signature: 7ad579pj6pekoz1m5engz9gk1i3mm9f7 X-Rspamd-Queue-Id: 930FCA0008 X-Rspam-User: X-HE-Tag: 1769418360-677874 X-HE-Meta: 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 rNCSQB9S wRiZIL4PwhuEuGADeDN5uWt36wPSpK8zO0tBhz5z6sdadqfTQl0a/mPIYXAlbX9vGqFmhuN9DBvn7Xqsdh8nVSFy17acxTR4XLiV65nLPLBzVRSfLb1sdwKf20Oz/0UTKNAtus53VfOm2LgbRJmyYdcSwPtUfayYXrR/EE5Uo7k505eh63x7cDNI5S+LP917t2t1zgAJa5UeIXzdDQwDzZ2l1X5oVzCGS5MRaBjOCFbtmAh8/I0K/hOTpbxtJGf9gqxFcNGkznsCQ66SuiciS2Nds6HlVEPPNeuLLNkKPf9oeNrg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Hui Zhu 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 Signed-off-by: Hui Zhu --- 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 70a00da54ff5..06c936bad211 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -13511,6 +13511,7 @@ 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