From patchwork Mon Aug 29 19:23:14 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: 12958375 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 0185DECAAD2 for ; Mon, 29 Aug 2022 19:23:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229760AbiH2TXn (ORCPT ); Mon, 29 Aug 2022 15:23:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229869AbiH2TXm (ORCPT ); Mon, 29 Aug 2022 15:23:42 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD7028708F for ; Mon, 29 Aug 2022 12:23:40 -0700 (PDT) Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27TJ5mmk015195 for ; Mon, 29 Aug 2022 12:23:40 -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=Ug5niAcs28nJ/3zhwKx/mbqbeJ1Eu/kgRwjDfxMHowo=; b=WOYb32pMAUaaQOM+n2DrsKwsF1sC4zR6DFz7HcwwL3HCm0PE+nw/0XKveIq1me/wLRcM OfGJnlwbAIcb1OM1KYEXQeskAhHY+o/pmdaQcQDTDSaFoh8oexDkd3JNQKCcnJYRq/ih ziwVA8XJgKEDQDR00SRIoWCdvA6gI+Pb8dE= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3j7h3uuq0f-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 29 Aug 2022 12:23:39 -0700 Received: from twshared29104.24.frc3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 29 Aug 2022 12:23:37 -0700 Received: by devbig931.frc1.facebook.com (Postfix, from userid 460691) id 23C74749ED61; Mon, 29 Aug 2022 12:23:35 -0700 (PDT) From: Kui-Feng Lee To: , , , , , CC: Kui-Feng Lee Subject: [PATCH bpf-next v8 2/5] bpf: Handle bpf_link_info for the parameterized task BPF iterators. Date: Mon, 29 Aug 2022 12:23:14 -0700 Message-ID: <20220829192317.486946-3-kuifeng@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220829192317.486946-1-kuifeng@fb.com> References: <20220829192317.486946-1-kuifeng@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: DxgSr-baYujXd1eLUKMA5pTBUuk98xAt X-Proofpoint-GUID: DxgSr-baYujXd1eLUKMA5pTBUuk98xAt 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=2022-08-29_09,2022-08-25_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 f212a19eda06..088cbc8f6a0c 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 0bc7277d1ee1..5140117447e5 100644 --- a/kernel/bpf/task_iter.c +++ b/kernel/bpf/task_iter.c @@ -668,6 +668,21 @@ 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, @@ -678,6 +693,7 @@ 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 = { @@ -699,6 +715,7 @@ 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 = { @@ -720,6 +737,7 @@ 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 40935278eede..864cf6a613d6 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 {