From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7B281D2D8C0 for ; Tue, 27 Jan 2026 09:43:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E3A546B008C; Tue, 27 Jan 2026 04:43:46 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E05836B0092; Tue, 27 Jan 2026 04:43:46 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CE7B06B0093; Tue, 27 Jan 2026 04:43:46 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id BF1406B008C for ; Tue, 27 Jan 2026 04:43:46 -0500 (EST) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 6C69B5C6C6 for ; Tue, 27 Jan 2026 09:43:46 +0000 (UTC) X-FDA: 84377256852.27.4014F6E Received: from out-179.mta1.migadu.com (out-179.mta1.migadu.com [95.215.58.179]) by imf18.hostedemail.com (Postfix) with ESMTP id B79181C0005 for ; Tue, 27 Jan 2026 09:43:44 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=YQXTc1qw; spf=pass (imf18.hostedemail.com: domain of hui.zhu@linux.dev designates 95.215.58.179 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769507024; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ycrFyw6aXaYmQPmQruEJsfLSWjPHoV8ar+xnlNHnd9w=; b=WnfqSj47KV/mUiF8zsAlzQnRLRBWEN6r1ZjBvUuqq7S8iQqp1Ou1RFYr8BXOd+CLculRIL Fwn2+KclEkbro4ymMu9lx9k7xonBgiXUCUwhEoVnDqb8jvUEDuhCoeyhEi2keV7UspimeA ibn1T1NZ0/inAqIqAdttuicDNy9X3ug= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=YQXTc1qw; spf=pass (imf18.hostedemail.com: domain of hui.zhu@linux.dev designates 95.215.58.179 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769507024; a=rsa-sha256; cv=none; b=KsKskGIVIGcF15aB8iDjDrkSaa30EiUZ/wsCudIAsQy5vOj7oqkJQxcsQdaW3GTtb7sxub bxAP3KEY8L8WHKdJvERFANflwNbVt9XR+updimz8jspV/35r/gEsbpO7YA/X400awbuhxX 170YPYNzFkWsWPBKd5hWv8623JXgyo8= 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=1769507022; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ycrFyw6aXaYmQPmQruEJsfLSWjPHoV8ar+xnlNHnd9w=; b=YQXTc1qwSK8YUcIlgs8w3Xp+DkzqZVrK9w7JA7p4wJtHvmD4cMt1T5d62d/hZOzzrTSVBH tUdc78LPAuaxmK47I0TuUtkE7/SOXlNqNq3qwXbzCw/sb/tzsdCY85bnStZpiMVXlLQBKB KxpyEQ0JelY7vPIP2LXhZyj+susJMGg= 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 Subject: [RFC PATCH bpf-next v5 02/12] bpf: initial support for attaching struct ops to cgroups Date: Tue, 27 Jan 2026 17:42:39 +0800 Message-ID: <1c5845208d235e5deb37807f3be93af325033ba5.1769506741.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Queue-Id: B79181C0005 X-Rspamd-Server: rspam07 X-Stat-Signature: mh7hnm3nzgybn6pzygx46ymcui9mfujx X-HE-Tag: 1769507024-913756 X-HE-Meta: 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 HLE/1M3X NYJndcsoFFSHZS3CUxr+9qkiXCv96e3g6Yq2B/GdnWWoK9uHK42mZqpoy//pNFwKV7Npaf38wiSwJ8KevGMcRS0hcJnhQ6FWkc0QQmGgV9AbIkUP5c72kL7CvIQjZ9cgoi8jThPML7N4KSEI4PwkHhAlIcoQ9aoxC4kRX/TBVf5dNuTYKMTWkjKi6cUYUaaCEKT8Mg2f7InUuW/GgjCrMgEf6lKrgHY8ukZaqn5GNNmZbIbUKp+oMdDgVhS5VhqkVqUcCcbqHRZO69hs= 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: Roman Gushchin When a struct ops is being attached and a bpf link is created, allow to pass a cgroup fd using bpf attr, so that struct ops can be attached to a cgroup instead of globally. Attached struct ops doesn't hold a reference to the cgroup, only preserves cgroup id. Signed-off-by: Roman Gushchin --- include/linux/bpf.h | 1 + kernel/bpf/bpf_struct_ops.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 899dd911dc82..720055d1dbce 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1895,6 +1895,7 @@ struct bpf_struct_ops_link { struct bpf_link link; struct bpf_map __rcu *map; wait_queue_head_t wait_hup; + u64 cgroup_id; }; struct bpf_link_primer { diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c index de01cf3025b3..c807793e7633 100644 --- a/kernel/bpf/bpf_struct_ops.c +++ b/kernel/bpf/bpf_struct_ops.c @@ -13,6 +13,7 @@ #include #include #include +#include struct bpf_struct_ops_value { struct bpf_struct_ops_common_value common; @@ -1377,6 +1378,20 @@ int bpf_struct_ops_link_create(union bpf_attr *attr) } bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_map_lops, NULL, attr->link_create.attach_type); +#ifdef CONFIG_CGROUPS + if (attr->link_create.cgroup.relative_fd) { + struct cgroup *cgrp; + + cgrp = cgroup_get_from_fd(attr->link_create.cgroup.relative_fd); + if (IS_ERR(cgrp)) { + err = PTR_ERR(cgrp); + goto err_out; + } + + link->cgroup_id = cgroup_id(cgrp); + cgroup_put(cgrp); + } +#endif /* CONFIG_CGROUPS */ err = bpf_link_prime(&link->link, &link_primer); if (err) -- 2.43.0