From patchwork Thu Apr 27 02:30:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Feng zhou X-Patchwork-Id: 677629 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57E54C77B60 for ; Thu, 27 Apr 2023 02:31:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242977AbjD0CbJ (ORCPT ); Wed, 26 Apr 2023 22:31:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242905AbjD0CbF (ORCPT ); Wed, 26 Apr 2023 22:31:05 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A383C3AA3 for ; Wed, 26 Apr 2023 19:30:40 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id 98e67ed59e1d1-2478485fd76so5447326a91.2 for ; Wed, 26 Apr 2023 19:30:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1682562640; x=1685154640; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4couG4BvY3JielUUZmpwOAXPZt7eiYYa/cnyqJtYMcY=; b=iCeciy53FkncyTEa61u93EdyroUtj3yVBYxIfPJjrHwdMOMMw928rZGTxVJJVLkFkb 7gIkVnBdyLdGoC1HiuFoGM7b2Mz3Af/SaGO/4XTlV6M2v3en8jkTUOyCHSrVYl+iXT3N dP6XRnOOEiEsm9WlR2pnQVrXK/3kETr8DtOYnQUw5B3B0UXNX4lTEUpbkx7Whln0c0YI O1x5gaZCKrdTt1OuwU8v8JrjmuUVJ967cKAUiagh3jIUjM4FtE/kQ85hHpC+6VSVxZMw hseVfj2scuw1HMzVb4LciHRbGZ3kNJkF2jo9N9F7InMZMQD93A/NOfvfS6IZ0eaJZESx 8YoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682562640; x=1685154640; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4couG4BvY3JielUUZmpwOAXPZt7eiYYa/cnyqJtYMcY=; b=IRzbEJFee+yJC08rALt/gIotPW+BfZ9O2J8kBGqsLInBwol8X6dHW3P97ULjEkfUds XQoNqkoJxc4QBuO2/NiXMZIhWf56wwKmTISxdGOGU22lPHp1oIHfsg5yPNLz1MZp98k5 Y7KqQQX44jaAIiom9Rk9Dfl4vkp+c3fPbnAVrgaXj4fhBiWC6O3Wb6KenvzA+fmlmNx5 ZhqKRkBgy6T7LLRVA1OJ6oE39GnuxXBrZBqAfDavcyIxsX6ILxkv6fDPLkpbfqDIOM/y oLj4MvkD87T5wsc/X8ZUb5GlPsSg5Ckq4VLXypmA6C8t9cc0EM8++WlsA2d11sJYFqgv 5EVA== X-Gm-Message-State: AC+VfDztWbpeqUEcHo/qqzzw0Owlr5Q+jvEGui2CHB/drU6A1nJxzq+g zW1TcsxoqXUP1c7qsJFkKqbNGw== X-Google-Smtp-Source: ACHHUZ6gccL1ZEpUmUDmifDB0DiS0469jZ/45YB8rECEfdb4SnsnHxXi1VpTC1ouLoKHsNE1+kTTjg== X-Received: by 2002:a17:90b:4acf:b0:22c:59c3:8694 with SMTP id mh15-20020a17090b4acf00b0022c59c38694mr181241pjb.44.1682562640127; Wed, 26 Apr 2023 19:30:40 -0700 (PDT) Received: from C02F52LSML85.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id m8-20020a654388000000b0051303d3e3c5sm10291852pgp.42.2023.04.26.19.30.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 19:30:39 -0700 (PDT) From: Feng zhou To: martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, yangzhenze@bytedance.com, wangdongdong.6@bytedance.com, zhoufeng.zf@bytedance.com Subject: [PATCH bpf-next v3 1/2] bpf: Add bpf_task_under_cgroup() kfunc Date: Thu, 27 Apr 2023 10:30:18 +0800 Message-Id: <20230427023019.73576-2-zhoufeng.zf@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20230427023019.73576-1-zhoufeng.zf@bytedance.com> References: <20230427023019.73576-1-zhoufeng.zf@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Feng Zhou Add a kfunc that's similar to the bpf_current_task_under_cgroup. The difference is that it is a designated task. When hook sched related functions, sometimes it is necessary to specify a task instead of the current task. Signed-off-by: Feng Zhou --- kernel/bpf/helpers.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index bb6b4637ebf2..453cbd312366 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -2149,6 +2149,25 @@ __bpf_kfunc struct cgroup *bpf_cgroup_from_id(u64 cgid) return NULL; return cgrp; } + +/** + * bpf_task_under_cgroup - wrap task_under_cgroup_hierarchy() as a kfunc, test + * task's membership of cgroup ancestry. + * @task: the task to be tested + * @ancestor: possible ancestor of @task's cgroup + * + * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor. + * It follows all the same rules as cgroup_is_descendant, and only applies + * to the default hierarchy. + */ +__bpf_kfunc long bpf_task_under_cgroup(struct task_struct *task, + struct cgroup *ancestor) +{ + if (unlikely(!ancestor || !task)) + return -EINVAL; + + return task_under_cgroup_hierarchy(task, ancestor); +} #endif /* CONFIG_CGROUPS */ /** @@ -2400,6 +2419,7 @@ BTF_ID_FLAGS(func, bpf_cgroup_acquire, KF_ACQUIRE | KF_RCU | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_cgroup_release, KF_RELEASE) BTF_ID_FLAGS(func, bpf_cgroup_ancestor, KF_ACQUIRE | KF_RCU | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_cgroup_from_id, KF_ACQUIRE | KF_RET_NULL) +BTF_ID_FLAGS(func, bpf_task_under_cgroup, KF_RCU) #endif BTF_ID_FLAGS(func, bpf_task_from_pid, KF_ACQUIRE | KF_RET_NULL) BTF_SET8_END(generic_btf_ids)