From patchwork Fri Aug 26 00:37:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kui-Feng Lee X-Patchwork-Id: 12955412 X-Patchwork-Delegate: bpf@iogearbox.net 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 B1EF3ECAAA2 for ; Fri, 26 Aug 2022 00:38:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233270AbiHZAiE (ORCPT ); Thu, 25 Aug 2022 20:38:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233266AbiHZAiE (ORCPT ); Thu, 25 Aug 2022 20:38:04 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 000F1C7F91 for ; Thu, 25 Aug 2022 17:38:02 -0700 (PDT) Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27PM4A17020053 for ; Thu, 25 Aug 2022 17:38:02 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=dAnyMjfAPnINIwvOh7VcAhDedpacRuUITnGCxKAM+Zw=; b=qCFJLEDmxRRL9fT2nkw8vLdLEU3mFcxlQocllQvhvUAhRZbSRV3qXYnChrgbcIoye2gc jSObPAO3Nk8uVQx0yu2LrayioioxgurLxoO6wzXrhWWmF2HmSErQaaFQhg3+Mybkk79X lmKfK48UWLrP2n1wWHrQCmdNUHjMBG/YOU0= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3j69jtmrry-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 25 Aug 2022 17:38:02 -0700 Received: from twshared22413.18.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Thu, 25 Aug 2022 17:38:01 -0700 Received: by devbig931.frc1.facebook.com (Postfix, from userid 460691) id E2B7671E4B82; Thu, 25 Aug 2022 17:37:49 -0700 (PDT) From: Kui-Feng Lee To: , , , , , CC: Kui-Feng Lee Subject: [PATCH bpf-next v7 2/5] bpf: Handle bpf_link_info for the parameterized task BPF iterators. Date: Thu, 25 Aug 2022 17:37:09 -0700 Message-ID: <20220826003712.2810158-3-kuifeng@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220826003712.2810158-1-kuifeng@fb.com> References: <20220826003712.2810158-1-kuifeng@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: 97NXFsJsF0Lx4psxCO1GBU7U_xXQz9UU X-Proofpoint-ORIG-GUID: 97NXFsJsF0Lx4psxCO1GBU7U_xXQz9UU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-25_11,2022-08-25_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add new fields to bpf_link_info that users can query it through bpf_obj_get_info_by_fd(). Signed-off-by: Kui-Feng Lee Acked-by: Yonghong Song --- include/uapi/linux/bpf.h | 4 ++++ kernel/bpf/task_iter.c | 18 ++++++++++++++++++ tools/include/uapi/linux/bpf.h | 4 ++++ 3 files changed, 26 insertions(+) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 385deab984e1..173d11df822c 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -6216,6 +6216,10 @@ struct bpf_link_info { __u64 cgroup_id; __u32 order; } cgroup; + struct { + __u32 tid; + __u32 pid; + } task; }; } iter; struct { diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c index 1200cfde71e3..72c8747dff89 100644 --- a/kernel/bpf/task_iter.c +++ b/kernel/bpf/task_iter.c @@ -608,6 +608,21 @@ static const struct bpf_iter_seq_info task_seq_info = { .seq_priv_size = sizeof(struct bpf_iter_seq_task_info), }; +static int bpf_iter_fill_link_info(const struct bpf_iter_aux_info *aux, struct bpf_link_info *info) +{ + switch (aux->task.type) { + case BPF_TASK_ITER_TID: + info->iter.task.tid = aux->task.pid; + break; + case BPF_TASK_ITER_TGID: + info->iter.task.pid = aux->task.pid; + break; + default: + break; + } + return 0; +} + static struct bpf_iter_reg task_reg_info = { .target = "task", .attach_target = bpf_iter_attach_task, @@ -618,6 +633,7 @@ static struct bpf_iter_reg task_reg_info = { PTR_TO_BTF_ID_OR_NULL }, }, .seq_info = &task_seq_info, + .fill_link_info = bpf_iter_fill_link_info, }; static const struct bpf_iter_seq_info task_file_seq_info = { @@ -639,6 +655,7 @@ static struct bpf_iter_reg task_file_reg_info = { PTR_TO_BTF_ID_OR_NULL }, }, .seq_info = &task_file_seq_info, + .fill_link_info = bpf_iter_fill_link_info, }; static const struct bpf_iter_seq_info task_vma_seq_info = { @@ -660,6 +677,7 @@ static struct bpf_iter_reg task_vma_reg_info = { PTR_TO_BTF_ID_OR_NULL }, }, .seq_info = &task_vma_seq_info, + .fill_link_info = bpf_iter_fill_link_info, }; BPF_CALL_5(bpf_find_vma, struct task_struct *, task, u64, start, diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index a54a1455333c..b0cc66332cc1 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -6216,6 +6216,10 @@ struct bpf_link_info { __u64 cgroup_id; __u32 order; } cgroup; + struct { + __u32 tid; + __u32 pid; + } task; }; } iter; struct {