From nobody Mon Feb 9 18:19:26 2026 Received: from out-179.mta1.migadu.com (out-179.mta1.migadu.com [95.215.58.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD08A2E62A9 for ; Tue, 27 Jan 2026 09:46:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769507205; cv=none; b=mvbYXVttLC9eJ9COoqnjyGdZ1Yv05m40BmWeNm0aG5J9763PS0M4rT7P5/9h+Z0oQNS0sm9K4i28Wy4UKpS7u5vXkRtAVkz4OEhQjFrTsfqgmc5LqlF44kNxPrnGsqOEWUeZkK6YMlySEYATEk9TEXNMTqPjKmFH5jI9S2aEw6w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769507205; c=relaxed/simple; bh=9PcymUN+ZCg2e50rgIRHOfTXaJvfmhQQChu88MTol/Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VJvXjVPmyqch7EUnK3GpC6GpbR2IaIvQOOO4Ihs/wAZsMyFQ2RuBz4CDjXob7FaJm0i77ISDRMdzIRotHrEmshCKf7g0reLMJjTwM3b/fQ19gA48UBWdSrI7u1WlIr6SiOki75WB2eqi4JtFKu2E8oiUluyJ36gRxyI8Isysc3E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=GybHeuHi; arc=none smtp.client-ip=95.215.58.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="GybHeuHi" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. 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: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" 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(co= nst struct bpf_map *map, } =20 link_opts.cgroup.relative_fd =3D OPTS_GET(opts, relative_fd, 0); + link_opts.flags =3D OPTS_GET(opts, flags, 0); =20 fd =3D bpf_link_create(map->fd, 0, BPF_STRUCT_OPS, &link_opts); if (fd < 0) { --=20 2.43.0