From patchwork Tue Jun 25 23:26:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 1122404 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.b="mUAnwZTf"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45YMk26Kksz9s5c for ; Wed, 26 Jun 2019 09:26:34 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726402AbfFYX0d (ORCPT ); Tue, 25 Jun 2019 19:26:33 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:28308 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726086AbfFYX0d (ORCPT ); Tue, 25 Jun 2019 19:26:33 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5PNOrLP013836 for ; Tue, 25 Jun 2019 16:26:32 -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=2ISvOPOKIVrYWFu7ujbA2wv/R9QGR/9taed2Ou3MxVQ=; b=mUAnwZTfnd0KuL4q66ZpkyeaIBepc2B2nWmMBSJEhKXp9q+DDQvgj6VdEgz1VEoTZU53 yAUWr5d1Pf473EVYUscPHGm1Mw8KwP9Vo+2zbCatCVsGMvLPiZKp0ZWaIt/73Mw75AoT XjIxVd1mnbj2d47if2JIi3Oi7DH7xGX1+G8= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2tbv9er7ed-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Tue, 25 Jun 2019 16:26:32 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::128) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Tue, 25 Jun 2019 16:26:31 -0700 Received: by dev101.prn2.facebook.com (Postfix, from userid 137359) id 3B4C7861829; Tue, 25 Jun 2019 16:26:28 -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 bpf-next 2/2] selftests/bpf: test perf buffer API Date: Tue, 25 Jun 2019 16:26:01 -0700 Message-ID: <20190625232601.3227055-3-andriin@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190625232601.3227055-1-andriin@fb.com> References: <20190625232601.3227055-1-andriin@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-06-25_15:, , 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-1906250191 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 | 86 +++++++++++++++++++ .../selftests/bpf/progs/test_perf_buffer.c | 31 +++++++ 2 files changed, 117 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..3ba3e26141ac --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/perf_buffer.c @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include + +static void on_sample(void *ctx, void *data, __u32 size) +{ + cpu_set_t *cpu_seen = ctx; + int cpu = *(int *)data; + + CPU_SET(cpu, cpu_seen); +} + +void test_perf_buffer(void) +{ + int err, prog_fd, prog_pfd, nr_cpus, i, duration = 0; + const char *prog_name = "kprobe/sys_nanosleep"; + const char *file = "./test_perf_buffer.o"; + 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; + + 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 */ + prog_pfd = bpf_program__attach_kprobe(prog, false /* retprobe */, + "sys_nanosleep"); + if (CHECK(prog_pfd < 0, "attach_kprobe", "err %d\n", prog_pfd)) + goto out_close; + + /* set up perf buffer */ + pb = perf_buffer__new(perf_buf_map, 1, on_sample, NULL, &cpu_seen); + 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: + libbpf_perf_event_disable_and_close(prog_pfd); +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..ba961f608fd5 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_perf_buffer.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include +#include +#include "bpf_helpers.h" + +struct { + int type; + int key_size; + int value_size; + int max_entries; +} perf_buf_map SEC(".maps") = { + .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, + .key_size = sizeof(int), + .value_size = sizeof(int), + .max_entries = 56, +}; + +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;