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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769507191; 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=GybHeuHiFgFrkJ7AI5shcktmPnd9xH64DeeRqlQBhSV0NblYrsh06r9lIa9PvDUqRdVvH8 G3IBrJjSqgSsbon2DrgvqkcEKLa3thyT+3AQ0GiRVk7tXtDpinuyKvLRIKacq4yEPFwPrZ d2++W8afsihpFC/CQhgMyILVg9H3cic= 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 v5 07/12] libbpf: Support passing user-defined flags for struct_ops Date: Tue, 27 Jan 2026 17:45:51 +0800 Message-ID: <63d543aec9ade803afcd95461e3089e3d44caca6.1769506741.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 2C5B7120003 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: kzqgipbexr89ja73xpkdp5cgxwmcjt39 X-HE-Tag: 1769507194-26713 X-HE-Meta: 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 76kycUSo zfbGP+woDwU22meI= 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