From patchwork Wed Dec 2 00:16:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 336605 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.0 required=3.0 tests=BAYES_00,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C32C4C83013 for ; Wed, 2 Dec 2020 00:24:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 78928206F9 for ; Wed, 2 Dec 2020 00:24:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726751AbgLBAYo convert rfc822-to-8bit (ORCPT ); Tue, 1 Dec 2020 19:24:44 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:54806 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726482AbgLBAYn (ORCPT ); Tue, 1 Dec 2020 19:24:43 -0500 Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0B20GuEd021821 for ; Tue, 1 Dec 2020 16:24:03 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3547g8qwu2-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 01 Dec 2020 16:24:02 -0800 Received: from intmgw001.03.ash8.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 1 Dec 2020 16:24:00 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 7802D2ECA70C; Tue, 1 Dec 2020 16:23:55 -0800 (PST) From: Andrii Nakryiko To: , , , CC: , Subject: [PATCH v4 bpf-next 00/14] Support BTF-powered BPF tracing programs for kernel modules Date: Tue, 1 Dec 2020 16:16:02 -0800 Message-ID: <20201202001616.3378929-1-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 X-FB-Internal: Safe X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-12-01_12:2020-11-30,2020-12-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0 clxscore=1034 spamscore=0 suspectscore=0 phishscore=0 mlxscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012020000 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch sets extends kernel and libbpf with support for attaching BTF-powered raw tracepoint (tp_btf) and tracing (fentry/fexit/fmod_ret/lsm) BPF programs to BPF hooks defined in kernel modules. As part of that, libbpf now supports performing CO-RE relocations against types in kernel module BTFs, in addition to existing vmlinux BTF support. Kernel UAPI for BPF_PROG_LOAD is extended with extra parameter (attach_btf_obj_id) which allows to specify kernel module BTF in which the BTF type is identifed by attach_btf_id. This patch set also sets up a convenient and fully-controlled custom kernel module (called "bpf_testmod"), that is a predictable playground for all the BPF selftests, that rely on module BTFs. Currently pahole doesn't generate BTF_KIND_FUNC info for ftrace-able static functions in kernel modules, so expose traced function in bpf_sidecar.ko. Once pahole is enhanced, we can go back to static function.