From patchwork Thu Dec 3 20:46:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 337527 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=ham 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 2CBBEC4361A for ; Thu, 3 Dec 2020 20:49:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD7F2221EA for ; Thu, 3 Dec 2020 20:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729425AbgLCUst convert rfc822-to-8bit (ORCPT ); Thu, 3 Dec 2020 15:48:49 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:31540 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729313AbgLCUst (ORCPT ); Thu, 3 Dec 2020 15:48:49 -0500 Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.16.0.42/8.16.0.42) with SMTP id 0B3KdsGa008235 for ; Thu, 3 Dec 2020 12:48:07 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by m0089730.ppops.net with ESMTP id 3576828hde-16 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 03 Dec 2020 12:48:07 -0800 Received: from intmgw004.03.ash8.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 3 Dec 2020 12:48:06 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 94B742ECA8BF; Thu, 3 Dec 2020 12:47:53 -0800 (PST) From: Andrii Nakryiko To: , , , CC: , Subject: [PATCH v6 bpf-next 00/14] Support BTF-powered BPF tracing programs for kernel modules Date: Thu, 3 Dec 2020 12:46:20 -0800 Message-ID: <20201203204634.1325171-1-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=2020-12-03_12:2020-12-03,2020-12-03 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 spamscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 adultscore=0 mlxlogscore=999 suspectscore=2 lowpriorityscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012030121 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 now allows to specify kernel module (or vmlinux) BTF object FD in attach_btf_obj_fd field, aliased to attach_prog_fd. This is used to identify which BTF object needs to be used for finding BTF type by provided 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.