From mboxrd@z Thu Jan 1 00:00:00 1970 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=-4.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no 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 2AA6BC32771 for ; Tue, 21 Jan 2020 00:54:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF2262253D for ; Tue, 21 Jan 2020 00:54:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579568051; bh=Irg3LcTPh1u0XJCUKe8NFYRmRUknNTd4QbnmXL1yVFY=; h=From:To:CC:Subject:Date:List-ID:From; b=UVIsPf9+3mJ469x/I4YhnbB1a2SurF+ohPid4ppv3WFPAVyDkYVfn4PFakF6IQAWI soB8lD40zU5r6BaKAP2HWtZaEn+2QCknawGwDEPkC8SxyOBSMpwsT9ZUSLp0TPBwjs jKwW2EDEvfCGbB6rl9HL8/JA51PGKOwh9NQRN0mY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728901AbgAUAyK convert rfc822-to-8bit (ORCPT ); Mon, 20 Jan 2020 19:54:10 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:10460 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728816AbgAUAyK (ORCPT ); Mon, 20 Jan 2020 19:54:10 -0500 Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00L0s8lr017834 for ; Mon, 20 Jan 2020 16:54:08 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 2xm0qqrvy2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 20 Jan 2020 16:54:08 -0800 Received: from intmgw001.06.prn3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:11d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Mon, 20 Jan 2020 16:53:56 -0800 Received: by devbig007.ftw2.facebook.com (Postfix, from userid 572438) id 98D6E760B6E; Mon, 20 Jan 2020 16:53:48 -0800 (PST) Smtp-Origin-Hostprefix: devbig From: Alexei Starovoitov Smtp-Origin-Hostname: devbig007.ftw2.facebook.com To: CC: , , , Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v2 bpf-next 0/3] bpf: Program extensions or dynamic re-linking Date: Mon, 20 Jan 2020 16:53:45 -0800 Message-ID: <20200121005348.2769920-1-ast@kernel.org> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-20_10:2020-01-20,2020-01-20 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 suspectscore=1 mlxscore=0 mlxlogscore=291 spamscore=0 phishscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001210005 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org The last few month BPF community has been discussing an approach to call chaining, since exiting bpt_tail_call() mechanism used in production XDP programs has plenty of downsides. The outcome of these discussion was a conclusion to implement dynamic re-linking of BPF programs. Where rootlet XDP program attached to a netdevice can programmatically define a policy of execution of other XDP programs. Such rootlet would be compiled as normal XDP program and provide a number of placeholder global functions which later can be replaced with future XDP programs. BPF trampoline, function by function verification were building blocks towards that goal. The patch 1 is a final building block. It introduces dynamic program extensions. A number of improvements like more flexible function by function verification and better libbpf api will be implemented in future patches. v1->v2: - addressed Andrii's comments - rebase Alexei Starovoitov (3): bpf: Introduce dynamic program extensions libbpf: Add support for program extensions selftests/bpf: Add tests for program extensions include/linux/bpf.h | 10 +- include/linux/bpf_types.h | 2 + include/linux/btf.h | 5 + include/uapi/linux/bpf.h | 1 + kernel/bpf/btf.c | 152 +++++++++++++++++- kernel/bpf/syscall.c | 15 +- kernel/bpf/trampoline.c | 41 ++++- kernel/bpf/verifier.c | 85 +++++++--- tools/include/uapi/linux/bpf.h | 1 + tools/lib/bpf/bpf.c | 3 +- tools/lib/bpf/libbpf.c | 13 +- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 2 + tools/lib/bpf/libbpf_probes.c | 1 + .../selftests/bpf/prog_tests/fexit_bpf2bpf.c | 20 ++- .../selftests/bpf/progs/fexit_bpf2bpf.c | 57 +++++++ .../selftests/bpf/progs/test_pkt_access.c | 8 +- 17 files changed, 384 insertions(+), 34 deletions(-) -- 2.23.0