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 A4087D72357 for ; Fri, 23 Jan 2026 08:56:35 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 13AFE6B0468; Fri, 23 Jan 2026 03:56:35 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0FC866B046A; Fri, 23 Jan 2026 03:56:35 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 007BD6B046B; Fri, 23 Jan 2026 03:56:34 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id E2A116B0468 for ; Fri, 23 Jan 2026 03:56:34 -0500 (EST) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id B56C7D2B3B for ; Fri, 23 Jan 2026 08:56:34 +0000 (UTC) X-FDA: 84362622708.20.85597B5 Received: from out-171.mta0.migadu.com (out-171.mta0.migadu.com [91.218.175.171]) by imf07.hostedemail.com (Postfix) with ESMTP id 23E6C40007 for ; Fri, 23 Jan 2026 08:56:32 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=NMD50k4b; spf=pass (imf07.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.171 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=1769158593; 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=mRzQHCKarCYBi7G1xIo0Ho9ytROzsvuCqz+L2Dk75mk=; b=o2SKevThXWWtkUaCiE/kYyiT/FFhnOaWDyaTZ502OBURf6IrSPJiAdtTm1Eg+jKSgH4WuL 2no++4HU4135DF4NZAY04vAGZpixXHS++nRwASrtbi1WHMnv2M1RsBb+HPfXV9Mbcp2qpQ EwYhJly4d+Sx0/4tfFEdSqAUdmzwbJE= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769158593; a=rsa-sha256; cv=none; b=z1oyvywUMq1r68gZ56o4i13pVmeOa2tNx7LDp+4eTvfMRFR3FP/reCHjg9A8jL12GXKkN3 UKhIjmRRzSM2C2B23n9+lLJICphIfQt/wh6jlavm9dVjzKQpbnL8szc7pE33L4KSxt5jJo 7ippe/5lldoI7w+B88KRFqVffxFC9Iw= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=NMD50k4b; spf=pass (imf07.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.171 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev 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=1769158589; 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=mRzQHCKarCYBi7G1xIo0Ho9ytROzsvuCqz+L2Dk75mk=; b=NMD50k4bUm77bwDcYhOB0EpujUCmId6LC0LnmOQ+cN7HRcsMqcCVMBNhz7FEmicI88cTzs fCiKD/e7ZUORx7uTYhwqmUndQiS7GsgwVJdfUZ4G1Wtzv8/QnHJOyc0nCpr8f/K4LOtplX e4UW3EsGa7P7cP1zRrhbOsTQC9UwH8w= 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 v3 02/12] bpf: initial support for attaching struct ops to cgroups Date: Fri, 23 Jan 2026 16:55:20 +0800 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 23E6C40007 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: d8udboh57174ethnb8bzuijrasdwgmg3 X-HE-Tag: 1769158592-663252 X-HE-Meta: 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 4JVz8VE1 /uRDujGtoPqK6q8pcHX2lr/FQ9nR/uD1vHdq5h8ms2gC6ND+cTs3c1wTKcspnrvGYu1Zu7/z3ENoy7ptNqlIYXxT1s24zE9ECWoHIddF+9EgWG5+prQRBkEIkY+189C5Eyyw0nICfDUs6SbPtU4uBOpxUjK6w2V5l7dsuJRB8WEzBVLm21QQalmwH8cQIeRbqqwXN+u4nRnHVUEWqgX73xIaR78bMirdRamohBXFpjeSeeBaSUWRD/M2Y5KziIgEjQMv7rPG8+y/V2CQ= 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 | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 031682f1ad39..7c15bac782fc 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1885,6 +1885,7 @@ 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..f575c5cd0dc8 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 +1378,18 @@ 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)) + return PTR_ERR(cgrp); + + 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