From patchwork Mon Dec 21 12:34:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hangbin Liu X-Patchwork-Id: 11984551 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=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 710BBC433E0 for ; Mon, 21 Dec 2020 12:36:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2412C223E4 for ; Mon, 21 Dec 2020 12:36:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726789AbgLUMgE (ORCPT ); Mon, 21 Dec 2020 07:36:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726598AbgLUMgD (ORCPT ); Mon, 21 Dec 2020 07:36:03 -0500 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C3BDC0613D3; Mon, 21 Dec 2020 04:35:23 -0800 (PST) Received: by mail-pj1-x1030.google.com with SMTP id z12so6107589pjn.1; Mon, 21 Dec 2020 04:35:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Ulgk96wPy+Ee8QTzpnx1U5Ga4okXYkg3GKF44NBjl7k=; b=CRs7210Hm4E0krnc1uDSIIZDnGskcFHwxDlvfU+nnnWL/FpKscZDbME1pgNOui227T Vrdr8jIZkTL9lbqxFpxZ9HsgC2TLBVdBrYVrbSfPPpI7BH7zmdDkxujchMBgithYtF76 kYSkVcFf7Gm0LpMtZOAZUqpMDfPQjiWaOwlUpSiPE8zkP0vTcz6LpwATjL7VeeHoc1ZW gXhfy7t5aDWQ/Qfau2TUNiuaYBFpECRS+V4clCNlZbM7xMn3FOEHj2aBpFy1EjBRFbkr SZ9Q7Simh8U69q1GNy8Ul2UQvg+gROsF7sMtyhcoXeFsWOyTRxEzyr3BV5u6KyYfYxGK VP/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Ulgk96wPy+Ee8QTzpnx1U5Ga4okXYkg3GKF44NBjl7k=; b=MIW2B2aDeosPxPCpZs2expSYNuucmDIyn63jplu5DlszLOcGRaf94/pZJtppXS3IHA gG61kUj7rL0NzcLG6DXsC+rZToKwoci2QS6aUKV/7p+dz6T/uR1RLJ1/X30PmU+5BL08 Dv6GwCSFPMXioKccjtLcFeHe6VFxwgTHIM4dqujfJbicqfbpjn12mukZAQwBC01MZY+Y witFfUzLKpG2gMEPYsz+iVga9B8Sx3rrvAXpbkxiQdGLHyvCMjfiPweAiIwcmrFo5XFn H4I6dtbje1BggNXVCvfI8mAcMLp8SXx9QObZGTLBZC4hGLVcMaeTeNKXiUzaeB8VUuaO Dn+g== X-Gm-Message-State: AOAM5327jpdALyOthuKYpmiyc6FhNYDhT7FaFhT8ZDB3otp9umTb8CSR N4+eC7ZBriUOss3Vvc80XBx3+oJdLj1Yuhav X-Google-Smtp-Source: ABdhPJzgwteHYy9de7zfsbDxzF8KJ4uYkfqueD25TFPg5Y+uL+6xzoJSt8i1epSyAOQQD/7SZgjf7g== X-Received: by 2002:a17:90a:5d03:: with SMTP id s3mr16504092pji.150.1608554122369; Mon, 21 Dec 2020 04:35:22 -0800 (PST) Received: from localhost.localdomain.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id a26sm15382204pgd.64.2020.12.21.04.35.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Dec 2020 04:35:21 -0800 (PST) From: Hangbin Liu To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Jiri Benc , Jesper Dangaard Brouer , Eelco Chaudron , ast@kernel.org, Daniel Borkmann , Lorenzo Bianconi , David Ahern , Andrii Nakryiko , Alexei Starovoitov , Hangbin Liu Subject: [PATCHv13 bpf-next 0/6] xdp: add a new helper for dev map multicast support Date: Mon, 21 Dec 2020 20:34:59 +0800 Message-Id: <20201221123505.1962185-1-liuhangbin@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201216143036.2296568-1-liuhangbin@gmail.com> References: <20201216143036.2296568-1-liuhangbin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net This patch is for xdp multicast support. which has been discussed before[0], The goal is to be able to implement an OVS-like data plane in XDP, i.e., a software switch that can forward XDP frames to multiple ports. To achieve this, an application needs to specify a group of interfaces to forward a packet to. It is also common to want to exclude one or more physical interfaces from the forwarding operation - e.g., to forward a packet to all interfaces in the multicast group except the interface it arrived on. While this could be done simply by adding more groups, this quickly leads to a combinatorial explosion in the number of groups an application has to maintain. To avoid the combinatorial explosion, we propose to include the ability to specify an "exclude group" as part of the forwarding operation. This needs to be a group (instead of just a single port index), because there may have multi interfaces you want to exclude. Thus, the logical forwarding operation becomes a "set difference" operation, i.e. "forward to all ports in group A that are not also in group B". This series implements such an operation using device maps to represent the groups. This means that the XDP program specifies two device maps, one containing the list of netdevs to redirect to, and the other containing the exclude list. To achieve this, I re-implement a new helper bpf_redirect_map_multi() to accept two maps, the forwarding map and exclude map. If user don't want to use exclude map and just want simply stop redirecting back to ingress device, they can use flag BPF_F_EXCLUDE_INGRESS. The 1st patch is Jesper's run devmap xdp_prog later in bulking step. The 2st patch add a new bpf arg to allow NULL map pointer. The 3rd patch add the new bpf_redirect_map_multi() helper. The 4-6 patches are for usage sample and testing purpose. I did same perf tests with the following topo: --------------------- --------------------- | Host A (i40e 10G) | ---------- | eno1(i40e 10G) | --------------------- | | | Host B | --------------------- | | | Host C (i40e 10G) | ---------- | eno2(i40e 10G) | --------------------- vlan2 | -------- | | veth1 -- | veth0| | | -------- | --------------------| On Host A: # pktgen/pktgen_sample03_burst_single_flow.sh -i eno1 -d $dst_ip -m $dst_mac -s 64 On Host B(Intel(R) Xeon(R) CPU E5-2690 v3 @ 2.60GHz, 128G Memory): Use xdp_redirect_map and xdp_redirect_map_multi in samples/bpf for testing. The veth0 in netns load dummy drop program. The forward_map max_entries in xdp_redirect_map_multi is modify to 4. Here is the perf result with 5.10 rc6: The are about +/- 0.1M deviation for native testing Version | Test | Generic | Native | Native + 2nd 5.10 rc6 | xdp_redirect_map i40e->i40e | 2.0M | 9.1M | 8.0M 5.10 rc6 | xdp_redirect_map i40e->veth | 1.7M | 11.0M | 9.7M 5.10 rc6 + patch1 | xdp_redirect_map i40e->i40e | 2.0M | 9.5M | 7.5M 5.10 rc6 + patch1 | xdp_redirect_map i40e->veth | 1.7M | 11.6M | 9.1M 5.10 rc6 + patch1-6 | xdp_redirect_map i40e->i40e | 2.0M | 9.5M | 7.5M 5.10 rc6 + patch1-6 | xdp_redirect_map i40e->veth | 1.7M | 11.6M | 9.1M 5.10 rc6 + patch1-6 | xdp_redirect_map_multi i40e->i40e | 1.7M | 7.8M | 6.4M 5.10 rc6 + patch1-6 | xdp_redirect_map_multi i40e->veth | 1.4M | 9.3M | 7.5M 5.10 rc6 + patch1-6 | xdp_redirect_map_multi i40e->i40e+veth | 1.0M | 3.2M | 2.7M Last but not least, thanks a lot to Toke, Jesper, Jiri and Eelco for suggestions and help on implementation. [0] https://xdp-project.net/#Handling-multicast v13: Pass in xdp_prog through __xdp_enqueue() for patch 01. Update related code in patch 03. v12: Add Jesper's xdp_prog patch, rebase my works on this and latest bpf-next Add 2nd xdp_prog test on the sample and selftests. v11: Fix bpf_redirect_map_multi() helper description typo. Add loop limit for devmap_get_next_obj() and dev_map_redirect_multi(). v10: Rebase the code to latest bpf-next. Update helper bpf_xdp_redirect_map_multi() - No need to check map pointer as we will do the check in verifier. v9: Update helper bpf_xdp_redirect_map_multi() - Use ARG_CONST_MAP_PTR_OR_NULL for helper arg2 v8: a) Update function dev_in_exclude_map(): - remove duplicate ex_map map_type check in - lookup the element in dev map by obj dev index directly instead of looping all the map v7: a) Fix helper flag check b) Limit the *ex_map* to use DEVMAP_HASH only and update function dev_in_exclude_map() to get better performance. v6: converted helper return types from int to long v5: a) Check devmap_get_next_key() return value. b) Pass through flags to __bpf_tx_xdp_map() instead of bool value. c) In function dev_map_enqueue_multi(), consume xdpf for the last obj instead of the first on. d) Update helper description and code comments to explain that we use NULL target value to distinguish multicast and unicast forwarding. e) Update memory model, memory id and frame_sz in xdpf_clone(). f) Split the tests from sample and add a bpf kernel selftest patch. v4: Fix bpf_xdp_redirect_map_multi_proto arg2_type typo v3: Based on Toke's suggestion, do the following update a) Update bpf_redirect_map_multi() description in bpf.h. b) Fix exclude_ifindex checking order in dev_in_exclude_map(). c) Fix one more xdpf clone in dev_map_enqueue_multi(). d) Go find next one in dev_map_enqueue_multi() if the interface is not able to forward instead of abort the whole loop. e) Remove READ_ONCE/WRITE_ONCE for ex_map. v2: Add new syscall bpf_xdp_redirect_map_multi() which could accept include/exclude maps directly. Hangbin Liu (5): bpf: add a new bpf argument type ARG_CONST_MAP_PTR_OR_NULL xdp: add a new helper for dev map multicast support sample/bpf: add xdp_redirect_map_multicast test selftests/bpf: Add verifier tests for bpf arg ARG_CONST_MAP_PTR_OR_NULL selftests/bpf: add xdp_redirect_multi test Jesper Dangaard Brouer (1): bpf: run devmap xdp_prog on flush instead of bulk enqueue include/linux/bpf.h | 21 ++ include/linux/filter.h | 1 + include/net/xdp.h | 1 + include/uapi/linux/bpf.h | 27 ++ kernel/bpf/devmap.c | 235 +++++++++++--- kernel/bpf/verifier.c | 16 +- net/core/filter.c | 118 ++++++- net/core/xdp.c | 29 ++ samples/bpf/Makefile | 3 + samples/bpf/xdp_redirect_map_multi_kern.c | 96 ++++++ samples/bpf/xdp_redirect_map_multi_user.c | 301 ++++++++++++++++++ tools/include/uapi/linux/bpf.h | 27 ++ tools/testing/selftests/bpf/Makefile | 3 +- .../bpf/progs/xdp_redirect_multi_kern.c | 120 +++++++ tools/testing/selftests/bpf/test_verifier.c | 22 +- .../selftests/bpf/test_xdp_redirect_multi.sh | 208 ++++++++++++ .../testing/selftests/bpf/verifier/map_ptr.c | 70 ++++ .../selftests/bpf/xdp_redirect_multi.c | 252 +++++++++++++++ 18 files changed, 1502 insertions(+), 48 deletions(-) create mode 100644 samples/bpf/xdp_redirect_map_multi_kern.c create mode 100644 samples/bpf/xdp_redirect_map_multi_user.c create mode 100644 tools/testing/selftests/bpf/progs/xdp_redirect_multi_kern.c create mode 100755 tools/testing/selftests/bpf/test_xdp_redirect_multi.sh create mode 100644 tools/testing/selftests/bpf/xdp_redirect_multi.c