From patchwork Thu Apr 6 15:30:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D. Wythe" X-Patchwork-Id: 13203652 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 78578C77B6F for ; Thu, 6 Apr 2023 15:30:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238770AbjDFPaw (ORCPT ); Thu, 6 Apr 2023 11:30:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237927AbjDFPat (ORCPT ); Thu, 6 Apr 2023 11:30:49 -0400 Received: from out30-124.freemail.mail.aliyun.com (out30-124.freemail.mail.aliyun.com [115.124.30.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8162F1BC0; Thu, 6 Apr 2023 08:30:45 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R781e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046060;MF=alibuda@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0VfTVmew_1680795034; Received: from j66a10360.sqa.eu95.tbsite.net(mailfrom:alibuda@linux.alibaba.com fp:SMTPD_---0VfTVmew_1680795034) by smtp.aliyun-inc.com; Thu, 06 Apr 2023 23:30:41 +0800 From: "D. Wythe" To: kgraul@linux.ibm.com, wenjia@linux.ibm.com, jaka@linux.ibm.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev Cc: kuba@kernel.org, davem@davemloft.net, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org Subject: [RFC PATCH bpf-next 0/5] net/smc: Introduce BPF injection capability Date: Thu, 6 Apr 2023 23:30:29 +0800 Message-Id: <1680795034-86384-1-git-send-email-alibuda@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: "D. Wythe" This patches attempt to introduce BPF injection capability for SMC, and add selftest to ensure code stability. As we all know that the SMC protocol is not suitable for all scenarios, especially for short-lived. However, for most applications, they cannot guarantee that there are no such scenarios at all. Therefore, apps may need some specific strategies to decide shall we need to use SMC or not, for example, apps can limit the scope of the SMC to a specific IP address or port. Based on the consideration of transparent replacement, we hope that apps can remain transparent even if they need to formulate some specific strategies for SMC using. That is, do not need to recompile their code. On the other hand, we need to ensure the scalability of strategies implementation. Although it is simple to use socket options or sysctl, it will bring more complexity to subsequent expansion. Fortunately, BPF can solve these concerns very well, users can write thire own strategies in eBPF to choose whether to use SMC or not. And it's quite easy for them to modify their strategies in the future. This patches implement injection capability for SMC via struct_ops. In that way, we can add new injection scenarios in the future. D. Wythe (5): net/smc: move smc_sock related structure definition net/smc: net/smc: allow smc to negotiate protocols on policies net/smc: allow set or get smc negotiator by sockopt bpf: add smc negotiator support in BPF struct_ops bpf/selftests: add selftest for SMC bpf capability include/net/smc.h | 268 +++++++++++++++++ include/uapi/linux/smc.h | 1 + kernel/bpf/bpf_struct_ops_types.h | 4 + net/Makefile | 1 + net/smc/Kconfig | 13 + net/smc/af_smc.c | 203 ++++++++++--- net/smc/bpf_smc.c | 359 +++++++++++++++++++++++ net/smc/smc.h | 224 -------------- tools/testing/selftests/bpf/prog_tests/bpf_smc.c | 107 +++++++ tools/testing/selftests/bpf/progs/bpf_smc.c | 265 +++++++++++++++++ 10 files changed, 1186 insertions(+), 259 deletions(-) create mode 100644 net/smc/bpf_smc.c create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_smc.c create mode 100644 tools/testing/selftests/bpf/progs/bpf_smc.c