From patchwork Thu Mar 25 12:00:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kumar Kartikeya Dwivedi X-Patchwork-Id: 409335 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,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 64D31C433E1 for ; Thu, 25 Mar 2021 12:03:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F0E1619CB for ; Thu, 25 Mar 2021 12:03:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231161AbhCYMDY (ORCPT ); Thu, 25 Mar 2021 08:03:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230500AbhCYMC6 (ORCPT ); Thu, 25 Mar 2021 08:02:58 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 22E9DC06174A; Thu, 25 Mar 2021 05:02:58 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id x7-20020a17090a2b07b02900c0ea793940so2615440pjc.2; Thu, 25 Mar 2021 05:02:58 -0700 (PDT) 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=EBCc1b3VS8OAWVirBhTJFkz3T9KQdBDUNva6rSRKOyc=; b=YtdfuQmfquFeqs9/wkrr6hcvZcyGec5OWKtR/QYXwyGuDhleOgBluZI6q7jPcLbTec 81XJdXmbvgR/v8mHTB3ihFAkkj5R90bk8hP4kDy9wevfIZ9lJYyV4qGZdrcbYDqU8Rx7 2PCM0EvEZX3yUAywih94in7FiPB5YyZRXDxf7HNqjT5yKsX1DRc/VWoMocYMTCo4aQIM o/VpjKy09pPRXD3knn+oAEdBxy+L4J4aal/YPHF4kJPz6OMFPqoe0YkWPDOSSlfb1z6N jGWus99jdg9EVHrBP7ZZ1ep8YUh00CuQ0GiZ7yyoONk+ZgabAGkwrLe5oxdkUH6HDXi0 ZTdQ== 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=EBCc1b3VS8OAWVirBhTJFkz3T9KQdBDUNva6rSRKOyc=; b=Gdyl8Nbgl42KWTxCMPfOgTJJW4CuPWDyj1OSv4Yr4sa9M+8QWU1TPZWpqmlcfbaiXr JyaB/2jTUsVDHE5ZVGjmQ2OYJrZfdqQepGTlqiYfTuDnLNHyS1yHJ2Dg6UIWHm98Q4A/ nGJuUwYzOaS96d2gobET8I7GUqZ9TvP93MoEL1T5pb++ejsnhsfUdDArS3Rr/Mg7ueg4 5ffwLitC1NqnpIHf3wJFtayZhpBFCY6+4hq5zcoV3e4YUlX/kIYF6rSQILKvGiH68Emy Xm15AmYKMm3nrig+dASecU0ZbhecBeoGqBoQIayTYBJFIJHHUsjq6lKx3Raak+y4hJ6G GA2A== X-Gm-Message-State: AOAM533hm7T0wFDY41MBrPusrQR1VtwarwnbcnKKJBQN8Wqie2J8rzFh JLx8MwOn7cOCiaAQWnEw/tEJMFvh4jDiUw== X-Google-Smtp-Source: ABdhPJzRLzxXur1jJPtFOouZ41pHnvy6ZvO1lbd0T3GjZTi0VRpCQW29ZcHvSTnOsYMUx4wzuFRn0g== X-Received: by 2002:a17:90a:5b11:: with SMTP id o17mr8909425pji.32.1616673777368; Thu, 25 Mar 2021 05:02:57 -0700 (PDT) Received: from localhost ([112.79.237.176]) by smtp.gmail.com with ESMTPSA id y24sm5718750pfn.213.2021.03.25.05.02.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 05:02:57 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: brouer@redhat.com, Kumar Kartikeya Dwivedi , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Shuah Khan , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , Peter Zijlstra , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 5/5] libbpf: add selftests for TC-BPF API Date: Thu, 25 Mar 2021 17:30:03 +0530 Message-Id: <20210325120020.236504-6-memxor@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210325120020.236504-1-memxor@gmail.com> References: <20210325120020.236504-1-memxor@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This adds some basic tests for the low level bpf_tc_* API and its bpf_program__attach_tc_* wrapper on top. Reviewed-by: Toke Høiland-Jørgensen Signed-off-by: Kumar Kartikeya Dwivedi --- .../selftests/bpf/prog_tests/test_tc_bpf.c | 261 ++++++++++++++++++ .../selftests/bpf/progs/test_tc_bpf_kern.c | 18 ++ 2 files changed, 279 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c create mode 100644 tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c diff --git a/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c b/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c new file mode 100644 index 000000000000..8bab56b4dea0 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include + +#define LO_IFINDEX 1 + +static int test_tc_cls_internal(int fd, __u32 parent_id) +{ + struct bpf_tc_cls_attach_id id = {}; + struct bpf_tc_cls_info info = {}; + int ret; + DECLARE_LIBBPF_OPTS(bpf_tc_cls_opts, opts, .handle = 1, .priority = 10, + .class_id = TC_H_MAKE(1UL << 16, 1), + .chain_index = 5); + + ret = bpf_tc_cls_attach_dev(fd, LO_IFINDEX, parent_id, ETH_P_IP, &opts, + &id); + if (CHECK_FAIL(ret < 0)) + return ret; + + ret = bpf_tc_cls_get_info_dev(fd, LO_IFINDEX, parent_id, ETH_P_IP, NULL, + &info); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = -1; + + if (CHECK_FAIL(info.id.ifindex != id.ifindex) || + CHECK_FAIL(info.id.parent_id != id.parent_id) || + CHECK_FAIL(info.id.handle != id.handle) || + CHECK_FAIL(info.id.protocol != id.protocol) || + CHECK_FAIL(info.id.chain_index != id.chain_index) || + CHECK_FAIL(info.id.priority != id.priority) || + CHECK_FAIL(info.id.ifindex != LO_IFINDEX) || + CHECK_FAIL(info.id.parent_id != parent_id) || + CHECK_FAIL(info.id.handle != 1) || + CHECK_FAIL(info.id.priority != 10) || + CHECK_FAIL(info.id.protocol != ETH_P_IP) || + CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 1)) || + CHECK_FAIL(info.id.chain_index != 5)) + goto end; + + opts.direct_action = true; + ret = bpf_tc_cls_replace_dev(fd, id.ifindex, id.parent_id, id.protocol, + &opts, &id); + if (CHECK_FAIL(ret < 0)) + return ret; + +end:; + ret = bpf_tc_cls_detach_dev(&id); + CHECK_FAIL(ret < 0); + return ret; +} + +static int test_tc_cls(struct bpf_program *prog, __u32 parent_id) +{ + struct bpf_tc_cls_info info = {}; + struct bpf_link *link; + int ret; + DECLARE_LIBBPF_OPTS(bpf_tc_cls_opts, opts, .priority = 10, .handle = 1, + .class_id = TC_H_MAKE(1UL << 16, 1)); + + link = bpf_program__attach_tc_cls_dev(prog, LO_IFINDEX, parent_id, + ETH_P_ALL, &opts); + if (CHECK_FAIL(IS_ERR_OR_NULL(link))) + return PTR_ERR(link); + + ret = bpf_tc_cls_get_info_dev(bpf_program__fd(prog), LO_IFINDEX, + parent_id, ETH_P_ALL, NULL, &info); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = -1; + + if (CHECK_FAIL(info.id.ifindex != LO_IFINDEX) || + CHECK_FAIL(info.id.handle != 1) || + CHECK_FAIL(info.id.priority != 10) || + CHECK_FAIL(info.id.protocol != ETH_P_ALL) || + CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 1))) + goto end; + + /* Demonstrate changing attributes (e.g. to direct action) */ + opts.class_id = TC_H_MAKE(1UL << 16, 2); + opts.direct_action = true; + + /* Disconnect as we drop to the lower level API, which invalidates the + * link. + */ + bpf_link__disconnect(link); + + ret = bpf_tc_cls_change_dev(bpf_program__fd(prog), info.id.ifindex, + info.id.parent_id, info.id.protocol, &opts, + &info.id); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = bpf_tc_cls_get_info_dev(bpf_program__fd(prog), info.id.ifindex, + info.id.parent_id, info.id.protocol, NULL, + &info); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = -1; + + if (CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 2))) + goto end; + if (CHECK_FAIL((info.bpf_flags & TCA_BPF_FLAG_ACT_DIRECT) != 1)) + goto end; + + ret = bpf_tc_cls_detach_dev(&info.id); + if (CHECK_FAIL(ret < 0)) + goto end; + +end: + ret = bpf_link__destroy(link); + CHECK_FAIL(ret < 0); + return ret; +} + +static int test_tc_act_internal(int fd) +{ + struct bpf_tc_act_info info = {}; + __u32 index = 0; + int ret; + DECLARE_LIBBPF_OPTS(bpf_tc_act_opts, opts, 0); + + ret = bpf_tc_act_attach(fd, &opts, &index); + if (CHECK_FAIL(ret < 0 || !index)) + goto end; + + index = 0; + ret = bpf_tc_act_attach(fd, &opts, &index); + if (CHECK_FAIL(ret < 0 || !index)) + goto end; + + opts.index = 3; + index = 0; + ret = bpf_tc_act_attach(fd, &opts, &index); + if (CHECK_FAIL(ret < 0 || !index)) + goto end; + + index = 0; + ret = bpf_tc_act_replace(fd, &opts, &index); + if (CHECK_FAIL(ret < 0 || !index)) + goto end; + + opts.index = 1; + ret = bpf_tc_act_attach(fd, &opts, &index); + if (CHECK_FAIL(!ret || ret != -EEXIST)) { + ret = -1; + goto end; + } + + for (int i = 0; i < 3; i++) { + memset(&info, 0, sizeof(info)); + + ret = bpf_tc_act_get_info(fd, &info); + if (CHECK_FAIL(ret < 0 && ret != -ESRCH)) + goto end; + + if (CHECK_FAIL(ret == -ESRCH)) + goto end; + + if (CHECK_FAIL(info.refcnt != 1)) + goto end; + + ret = bpf_tc_act_detach(info.index); + if (CHECK_FAIL(ret < 0)) + goto end; + } + + CHECK_FAIL(bpf_tc_act_get_info(fd, &info) == -ESRCH); + +end: + ret = bpf_tc_act_detach(0); + CHECK_FAIL(ret < 0); + return ret; +} + +static int test_tc_act(struct bpf_program *prog) +{ + struct bpf_tc_act_info info = {}; + struct bpf_link *link; + int ret; + DECLARE_LIBBPF_OPTS(bpf_tc_act_opts, opts, .index = 42); + + link = bpf_program__attach_tc_act(prog, &opts); + if (CHECK_FAIL(IS_ERR_OR_NULL(link))) + return PTR_ERR(link); + + ret = bpf_tc_act_get_info(bpf_program__fd(prog), &info); + if (CHECK_FAIL(ret < 0)) + goto end; + + if (CHECK_FAIL(info.index != 42)) + goto end; + +end: + ret = bpf_link__destroy(link); + CHECK_FAIL(ret < 0); + return ret; +} + +void test_test_tc_bpf(void) +{ + const char *file = "./test_tc_bpf_kern.o"; + int cls_fd, act_fd, ret; + struct bpf_program *clsp, *actp; + struct bpf_object *obj; + + obj = bpf_object__open(file); + if (CHECK_FAIL(IS_ERR_OR_NULL(obj))) + return; + + clsp = bpf_object__find_program_by_title(obj, "classifier"); + if (CHECK_FAIL(IS_ERR_OR_NULL(clsp))) + goto end; + + actp = bpf_object__find_program_by_title(obj, "action"); + if (CHECK_FAIL(IS_ERR_OR_NULL(clsp))) + goto end; + + ret = bpf_object__load(obj); + if (CHECK_FAIL(ret < 0)) + goto end; + + cls_fd = bpf_program__fd(clsp); + act_fd = bpf_program__fd(actp); + + if (CHECK_FAIL(system("tc qdisc add dev lo clsact"))) + goto end; + + ret = test_tc_cls_internal(cls_fd, BPF_TC_CLSACT_INGRESS); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = test_tc_cls(clsp, BPF_TC_CLSACT_EGRESS); + if (CHECK_FAIL(ret < 0)) + goto end; + + system("tc qdisc del dev lo clsact"); + + ret = test_tc_act_internal(act_fd); + if (CHECK_FAIL(ret < 0)) + goto end; + + ret = test_tc_act(actp); + if (CHECK_FAIL(ret < 0)) + goto end; + +end: + bpf_object__close(obj); + return; +} diff --git a/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c b/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c new file mode 100644 index 000000000000..d39644ea0fd7 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +// Dummy prog to test tc_bpf API + +SEC("classifier") +int cls(struct __sk_buff *skb) +{ + return 0; +} + +SEC("action") +int act(struct __sk_buff *skb) +{ + return 0; +}