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=-10.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 06A03C0650E for ; Sat, 6 Jul 2019 04:35:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4A7A21670 for ; Sat, 6 Jul 2019 04:35:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="NnyUTt/i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726023AbfGFEfj (ORCPT ); Sat, 6 Jul 2019 00:35:39 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:26724 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725870AbfGFEfg (ORCPT ); Sat, 6 Jul 2019 00:35:36 -0400 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x664Y3bX003702 for ; Fri, 5 Jul 2019 21:35:36 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=9KN4Zeh2CbHl7d0xXD7GMMMjfV5LdC26AU5gC4FU9SU=; b=NnyUTt/i3eXPGNkemUWYxIyZ08vlK8S9wgy8U2ZrYtLRW7PgJpvvsHzA/g9F45VS/K/0 xwhF1XCBis0Ix+An0nG0McNsKBQuTSd1DInCIJ5jvIbVIMeaeecYs8678l/LZa24kSg1 0KJqvIYiQllmdSogTfj+u/g6bbcr0/vw6+A= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 2thxs5c6qa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 05 Jul 2019 21:35:36 -0700 Received: from mx-out.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 5 Jul 2019 21:35:34 -0700 Received: by dev101.prn2.facebook.com (Postfix, from userid 137359) id D49D786163A; Fri, 5 Jul 2019 21:35:32 -0700 (PDT) Smtp-Origin-Hostprefix: dev From: Andrii Nakryiko Smtp-Origin-Hostname: dev101.prn2.facebook.com To: , , , , , CC: Andrii Nakryiko Smtp-Origin-Cluster: prn2c23 Subject: [PATCH v5 bpf-next 3/5] selftests/bpf: test perf buffer API Date: Fri, 5 Jul 2019 21:35:20 -0700 Message-ID: <20190706043522.1559005-4-andriin@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190706043522.1559005-1-andriin@fb.com> References: <20190706043522.1559005-1-andriin@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-05_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907060058 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add test verifying perf buffer API functionality. Signed-off-by: Andrii Nakryiko Acked-by: Song Liu --- .../selftests/bpf/prog_tests/perf_buffer.c | 94 +++++++++++++++++++ .../selftests/bpf/progs/test_perf_buffer.c | 25 +++++ 2 files changed, 119 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/perf_buffer.c create mode 100644 tools/testing/selftests/bpf/progs/test_perf_buffer.c diff --git a/tools/testing/selftests/bpf/prog_tests/perf_buffer.c b/tools/testing/selftests/bpf/prog_tests/perf_buffer.c new file mode 100644 index 000000000000..64556ab0d1a9 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/perf_buffer.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include + +static void on_sample(void *ctx, int cpu, void *data, __u32 size) +{ + int cpu_data = *(int *)data, duration = 0; + cpu_set_t *cpu_seen = ctx; + + if (cpu_data != cpu) + CHECK(cpu_data != cpu, "check_cpu_data", + "cpu_data %d != cpu %d\n", cpu_data, cpu); + + CPU_SET(cpu, cpu_seen); +} + +void test_perf_buffer(void) +{ + int err, prog_fd, nr_cpus, i, duration = 0; + const char *prog_name = "kprobe/sys_nanosleep"; + const char *file = "./test_perf_buffer.o"; + struct perf_buffer_opts pb_opts = {}; + struct bpf_map *perf_buf_map; + cpu_set_t cpu_set, cpu_seen; + struct bpf_program *prog; + struct bpf_object *obj; + struct perf_buffer *pb; + struct bpf_link *link; + + nr_cpus = libbpf_num_possible_cpus(); + if (CHECK(nr_cpus < 0, "nr_cpus", "err %d\n", nr_cpus)) + return; + + /* load program */ + err = bpf_prog_load(file, BPF_PROG_TYPE_KPROBE, &obj, &prog_fd); + if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno)) + return; + + prog = bpf_object__find_program_by_title(obj, prog_name); + if (CHECK(!prog, "find_probe", "prog '%s' not found\n", prog_name)) + goto out_close; + + /* load map */ + perf_buf_map = bpf_object__find_map_by_name(obj, "perf_buf_map"); + if (CHECK(!perf_buf_map, "find_perf_buf_map", "not found\n")) + goto out_close; + + /* attach kprobe */ + link = bpf_program__attach_kprobe(prog, false /* retprobe */, + "sys_nanosleep"); + if (CHECK(IS_ERR(link), "attach_kprobe", "err %ld\n", PTR_ERR(link))) + goto out_close; + + /* set up perf buffer */ + pb_opts.sample_cb = on_sample; + pb_opts.ctx = &cpu_seen; + pb = perf_buffer__new(bpf_map__fd(perf_buf_map), 1, &pb_opts); + if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb))) + goto out_detach; + + /* trigger kprobe on every CPU */ + CPU_ZERO(&cpu_seen); + for (i = 0; i < nr_cpus; i++) { + CPU_ZERO(&cpu_set); + CPU_SET(i, &cpu_set); + + err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), + &cpu_set); + if (err && CHECK(err, "set_affinity", "cpu #%d, err %d\n", + i, err)) + goto out_detach; + + usleep(1); + } + + /* read perf buffer */ + err = perf_buffer__poll(pb, 100); + if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err)) + goto out_free_pb; + + if (CHECK(CPU_COUNT(&cpu_seen) != nr_cpus, "seen_cpu_cnt", + "expect %d, seen %d\n", nr_cpus, CPU_COUNT(&cpu_seen))) + goto out_free_pb; + +out_free_pb: + perf_buffer__free(pb); +out_detach: + bpf_link__destroy(link); +out_close: + bpf_object__close(obj); +} diff --git a/tools/testing/selftests/bpf/progs/test_perf_buffer.c b/tools/testing/selftests/bpf/progs/test_perf_buffer.c new file mode 100644 index 000000000000..876c27deb65a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_perf_buffer.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include +#include +#include "bpf_helpers.h" + +struct { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(int)); +} perf_buf_map SEC(".maps"); + +SEC("kprobe/sys_nanosleep") +int handle_sys_nanosleep_entry(struct pt_regs *ctx) +{ + int cpu = bpf_get_smp_processor_id(); + + bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU, + &cpu, sizeof(cpu)); + return 0; +} + +char _license[] SEC("license") = "GPL"; +__u32 _version SEC("version") = 1; -- 2.17.1