From patchwork Sun May 17 19:57:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 219081 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH, 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 A5ECEC433E1 for ; Sun, 17 May 2020 19:58:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87A7C20758 for ; Sun, 17 May 2020 19:58:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="ljuVYDJK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726855AbgEQT6F (ORCPT ); Sun, 17 May 2020 15:58:05 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:37624 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726715AbgEQT5y (ORCPT ); Sun, 17 May 2020 15:57:54 -0400 Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 04HJqoGj023455 for ; Sun, 17 May 2020 12:57:52 -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-transfer-encoding : content-type; s=facebook; bh=In1dYdsF3WgnndXMLDTL1E4M0iOAz+O9fxDc5Uy4y1s=; b=ljuVYDJKqa5vrkUpRWwT5L6QJCSyVmsvG9OtnSKy+S1yiSeoCJ7Dv48QodJ6TcvER1yw 7RCkSkaQJgjr9Bq1fq7TKcHPG5YDsygmVBxPeuelcP3OgGpQ3SaFGyuMU7zipj18vBWr GTuzFr5McskZYqv9LZ2kr0KGUWHZifD31A4= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 312dwq2nkd-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Sun, 17 May 2020 12:57:52 -0700 Received: from intmgw001.03.ash8.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Sun, 17 May 2020 12:57:48 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 1DD7C2EC32DC; Sun, 17 May 2020 12:57:46 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Andrii Nakryiko Smtp-Origin-Hostname: devbig012.ftw2.facebook.com To: , , , CC: , , Andrii Nakryiko , "Paul E . McKenney" , Jonathan Lemon Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v2 bpf-next 5/7] selftests/bpf: add BPF ringbuf selftests Date: Sun, 17 May 2020 12:57:25 -0700 Message-ID: <20200517195727.279322-6-andriin@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200517195727.279322-1-andriin@fb.com> References: <20200517195727.279322-1-andriin@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-17_08:2020-05-15,2020-05-17 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 suspectscore=25 spamscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 phishscore=0 cotscore=-2147483648 lowpriorityscore=0 adultscore=0 malwarescore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005170182 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Both singleton BPF ringbuf and BPF ringbuf with map-in-map use cases are tested. Also reserve+submit/discards and output variants of API are validated. Signed-off-by: Andrii Nakryiko --- .../selftests/bpf/prog_tests/ringbuf.c | 211 ++++++++++++++++++ .../selftests/bpf/prog_tests/ringbuf_multi.c | 102 +++++++++ .../selftests/bpf/progs/test_ringbuf.c | 78 +++++++ .../selftests/bpf/progs/test_ringbuf_multi.c | 77 +++++++ 4 files changed, 468 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/ringbuf.c create mode 100644 tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c create mode 100644 tools/testing/selftests/bpf/progs/test_ringbuf.c create mode 100644 tools/testing/selftests/bpf/progs/test_ringbuf_multi.c diff --git a/tools/testing/selftests/bpf/prog_tests/ringbuf.c b/tools/testing/selftests/bpf/prog_tests/ringbuf.c new file mode 100644 index 000000000000..bb8541f240e2 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/ringbuf.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "test_ringbuf.skel.h" + +#define EDONE 7777 + +static int duration = 0; + +struct sample { + int pid; + int seq; + long value; + char comm[16]; +}; + +static int sample_cnt; + +static int process_sample(void *ctx, void *data, size_t len) +{ + struct sample *s = data; + + sample_cnt++; + + switch (s->seq) { + case 0: + CHECK(s->value != 333, "sample1_value", "exp %ld, got %ld\n", + 333L, s->value); + return 0; + case 1: + CHECK(s->value != 777, "sample2_value", "exp %ld, got %ld\n", + 777L, s->value); + return -EDONE; + default: + /* we don't care about the rest */ + return 0; + } +} + +static struct test_ringbuf *skel; +static struct ring_buffer *ringbuf; + +static void trigger_samples() +{ + skel->bss->dropped = 0; + skel->bss->total = 0; + skel->bss->discarded = 0; + + /* trigger exactly two samples */ + skel->bss->value = 333; + syscall(__NR_getpgid); + skel->bss->value = 777; + syscall(__NR_getpgid); +} + +static void *poll_thread(void *input) +{ + long timeout = (long)input; + + return (void *)(long)ring_buffer__poll(ringbuf, timeout); +} + +void test_ringbuf(void) +{ + const size_t rec_sz = BPF_RINGBUF_HDR_SZ + sizeof(struct sample); + pthread_t thread; + long bg_ret = -1; + int err; + + skel = test_ringbuf__open_and_load(); + if (CHECK(!skel, "skel_open_load", "skeleton open&load failed\n")) + return; + + /* only trigger BPF program for current process */ + skel->bss->pid = getpid(); + + ringbuf = ring_buffer__new(bpf_map__fd(skel->maps.ringbuf), + process_sample, NULL, NULL); + if (CHECK(!ringbuf, "ringbuf_create", "failed to create ringbuf\n")) + goto cleanup; + + err = test_ringbuf__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attachment failed: %d\n", err)) + goto cleanup; + + trigger_samples(); + + /* 2 submitted + 1 discarded records */ + CHECK(skel->bss->avail_data != 3 * rec_sz, + "err_avail_size", "exp %ld, got %ld\n", + 3L * rec_sz, skel->bss->avail_data); + CHECK(skel->bss->ring_size != 4096, + "err_ring_size", "exp %ld, got %ld\n", + 4096L, skel->bss->ring_size); + CHECK(skel->bss->cons_pos != 0, + "err_cons_pos", "exp %ld, got %ld\n", + 0L, skel->bss->cons_pos); + CHECK(skel->bss->prod_pos != 3 * rec_sz, + "err_prod_pos", "exp %ld, got %ld\n", + 3L * rec_sz, skel->bss->prod_pos); + + /* poll for samples */ + err = ring_buffer__poll(ringbuf, -1); + + /* -EDONE is used as an indicator that we are done */ + if (CHECK(err != -EDONE, "err_done", "done err: %d\n", err)) + goto cleanup; + + /* we expect extra polling to return nothing */ + err = ring_buffer__poll(ringbuf, 0); + if (CHECK(err != 0, "extra_samples", "poll result: %d\n", err)) + goto cleanup; + + CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n", + 0L, skel->bss->dropped); + CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n", + 2L, skel->bss->total); + CHECK(skel->bss->discarded != 1, "err_discarded", "exp %ld, got %ld\n", + 1L, skel->bss->discarded); + + /* now validate consumer position is updated and returned */ + trigger_samples(); + CHECK(skel->bss->cons_pos != 3 * rec_sz, + "err_cons_pos", "exp %ld, got %ld\n", + 3L * rec_sz, skel->bss->cons_pos); + err = ring_buffer__poll(ringbuf, -1); + CHECK(err <= 0, "poll_err", "err %d\n", err); + + /* start poll in background w/ long timeout */ + err = pthread_create(&thread, NULL, poll_thread, (void *)(long)10000); + if (CHECK(err, "bg_poll", "pthread_create failed: %d\n", err)) + goto cleanup; + + /* turn off notifications now */ + skel->bss->flags = BPF_RB_NO_WAKEUP; + + /* give background thread a bit of a time */ + usleep(50000); + trigger_samples(); + /* sleeping arbitrarily is bad, but no better way to know that + * epoll_wait() **DID NOT** unblock in background thread + */ + usleep(50000); + /* background poll should still be blocked */ + err = pthread_tryjoin_np(thread, (void **)&bg_ret); + if (CHECK(err != EBUSY, "try_join", "err %d\n", err)) + goto cleanup; + + /* BPF side did everything right */ + CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n", + 0L, skel->bss->dropped); + CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n", + 2L, skel->bss->total); + CHECK(skel->bss->discarded != 1, "err_discarded", "exp %ld, got %ld\n", + 1L, skel->bss->discarded); + + /* clear flags to return to "adaptive" notification mode */ + skel->bss->flags = 0; + + /* produce new samples, no notification should be triggered, because + * consumer is now behind + */ + trigger_samples(); + + /* background poll should still be blocked */ + err = pthread_tryjoin_np(thread, (void **)&bg_ret); + if (CHECK(err != EBUSY, "try_join", "err %d\n", err)) + goto cleanup; + + /* now force notifications */ + skel->bss->flags = BPF_RB_FORCE_WAKEUP; + sample_cnt = 0; + trigger_samples(); + + /* now we should get a pending notification */ + usleep(50000); + err = pthread_tryjoin_np(thread, (void **)&bg_ret); + if (CHECK(err, "join_bg", "err %d\n", err)) + goto cleanup; + + if (CHECK(bg_ret != 1, "bg_ret", "epoll_wait result: %ld", bg_ret)) + goto cleanup; + + /* 3 rounds, 2 samples each */ + CHECK(sample_cnt != 6, "wrong_sample_cnt", + "expected to see %d samples, got %d\n", 6, sample_cnt); + + /* BPF side did everything right */ + CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n", + 0L, skel->bss->dropped); + CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n", + 2L, skel->bss->total); + CHECK(skel->bss->discarded != 1, "err_discarded", "exp %ld, got %ld\n", + 1L, skel->bss->discarded); + + test_ringbuf__detach(skel); +cleanup: + ring_buffer__free(ringbuf); + test_ringbuf__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c b/tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c new file mode 100644 index 000000000000..78e450609803 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include "test_ringbuf_multi.skel.h" + +static int duration = 0; + +struct sample { + int pid; + int seq; + long value; + char comm[16]; +}; + +static int process_sample(void *ctx, void *data, size_t len) +{ + int ring = (unsigned long)ctx; + struct sample *s = data; + + switch (s->seq) { + case 0: + CHECK(ring != 1, "sample1_ring", "exp %d, got %d\n", 1, ring); + CHECK(s->value != 333, "sample1_value", "exp %ld, got %ld\n", + 333L, s->value); + break; + case 1: + CHECK(ring != 2, "sample2_ring", "exp %d, got %d\n", 2, ring); + CHECK(s->value != 777, "sample2_value", "exp %ld, got %ld\n", + 777L, s->value); + break; + default: + CHECK(true, "extra_sample", "unexpected sample seq %d, val %ld\n", + s->seq, s->value); + return -1; + } + + return 0; +} + +void test_ringbuf_multi(void) +{ + struct test_ringbuf_multi *skel; + struct ring_buffer *ringbuf; + int err; + + skel = test_ringbuf_multi__open_and_load(); + if (CHECK(!skel, "skel_open_load", "skeleton open&load failed\n")) + return; + + /* only trigger BPF program for current process */ + skel->bss->pid = getpid(); + + ringbuf = ring_buffer__new(bpf_map__fd(skel->maps.ringbuf1), + process_sample, (void *)(long)1, NULL); + if (CHECK(!ringbuf, "ringbuf_create", "failed to create ringbuf\n")) + goto cleanup; + + err = ring_buffer__add(ringbuf, bpf_map__fd(skel->maps.ringbuf2), + process_sample, (void *)(long)2); + if (CHECK(err, "ringbuf_add", "failed to add another ring\n")) + goto cleanup; + + err = test_ringbuf_multi__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attachment failed: %d\n", err)) + goto cleanup; + + /* trigger few samples, some will be skipped */ + skel->bss->target_ring = 0; + skel->bss->value = 333; + syscall(__NR_getpgid); + + /* skipped, no ringbuf in slot 1 */ + skel->bss->target_ring = 1; + skel->bss->value = 555; + syscall(__NR_getpgid); + + skel->bss->target_ring = 2; + skel->bss->value = 777; + syscall(__NR_getpgid); + + /* poll for samples, should get 2 ringbufs back */ + err = ring_buffer__poll(ringbuf, -1); + if (CHECK(err != 4, "poll_res", "expected 4 records, got %d\n", err)) + goto cleanup; + + /* expect extra polling to return nothing */ + err = ring_buffer__poll(ringbuf, 0); + if (CHECK(err < 0, "extra_samples", "poll result: %d\n", err)) + goto cleanup; + + CHECK(skel->bss->dropped != 0, "err_dropped", "exp %ld, got %ld\n", + 0L, skel->bss->dropped); + CHECK(skel->bss->skipped != 1, "err_skipped", "exp %ld, got %ld\n", + 1L, skel->bss->skipped); + CHECK(skel->bss->total != 2, "err_total", "exp %ld, got %ld\n", + 2L, skel->bss->total); + +cleanup: + ring_buffer__free(ringbuf); + test_ringbuf_multi__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_ringbuf.c b/tools/testing/selftests/bpf/progs/test_ringbuf.c new file mode 100644 index 000000000000..79114eafd283 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_ringbuf.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include +#include + +char _license[] SEC("license") = "GPL"; + +struct sample { + int pid; + int seq; + long value; + char comm[16]; +}; + +struct { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, 1 << 12); +} ringbuf SEC(".maps"); + +/* inputs */ +int pid = 0; +long value = 0; +long flags = 0; + +/* outputs */ +long total = 0; +long discarded = 0; +long dropped = 0; + +long avail_data = 0; +long ring_size = 0; +long cons_pos = 0; +long prod_pos = 0; + +/* inner state */ +long seq = 0; + +SEC("tp/syscalls/sys_enter_getpgid") +int test_ringbuf(void *ctx) +{ + int cur_pid = bpf_get_current_pid_tgid() >> 32; + struct sample *sample; + int zero = 0; + + if (cur_pid != pid) + return 0; + + sample = bpf_ringbuf_reserve(&ringbuf, sizeof(*sample), 0); + if (!sample) { + __sync_fetch_and_add(&dropped, 1); + return 1; + } + + sample->pid = pid; + bpf_get_current_comm(sample->comm, sizeof(sample->comm)); + sample->value = value; + + sample->seq = seq++; + __sync_fetch_and_add(&total, 1); + + if (sample->seq & 1) { + /* copy from reserved sample to a new one... */ + bpf_ringbuf_output(&ringbuf, sample, sizeof(*sample), flags); + /* ...and then discard reserved sample */ + bpf_ringbuf_discard(sample, flags); + __sync_fetch_and_add(&discarded, 1); + } else { + bpf_ringbuf_submit(sample, flags); + } + + avail_data = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA); + ring_size = bpf_ringbuf_query(&ringbuf, BPF_RB_RING_SIZE); + cons_pos = bpf_ringbuf_query(&ringbuf, BPF_RB_CONS_POS); + prod_pos = bpf_ringbuf_query(&ringbuf, BPF_RB_PROD_POS); + + return 0; +} diff --git a/tools/testing/selftests/bpf/progs/test_ringbuf_multi.c b/tools/testing/selftests/bpf/progs/test_ringbuf_multi.c new file mode 100644 index 000000000000..7eb85dd9cd66 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_ringbuf_multi.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include +#include + +char _license[] SEC("license") = "GPL"; + +struct sample { + int pid; + int seq; + long value; + char comm[16]; +}; + +struct ringbuf_map { + __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, 1 << 12); +} ringbuf1 SEC(".maps"), + ringbuf2 SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS); + __uint(max_entries, 4); + __type(key, int); + __array(values, struct ringbuf_map); +} ringbuf_arr SEC(".maps") = { + .values = { + [0] = &ringbuf1, + [2] = &ringbuf2, + }, +}; + +/* inputs */ +int pid = 0; +int target_ring = 0; +long value = 0; + +/* outputs */ +long total = 0; +long dropped = 0; +long skipped = 0; + +SEC("tp/syscalls/sys_enter_getpgid") +int test_ringbuf(void *ctx) +{ + int cur_pid = bpf_get_current_pid_tgid() >> 32; + struct sample *sample; + void *rb; + int zero = 0; + + if (cur_pid != pid) + return 0; + + rb = bpf_map_lookup_elem(&ringbuf_arr, &target_ring); + if (!rb) { + skipped += 1; + return 1; + } + + sample = bpf_ringbuf_reserve(rb, sizeof(*sample), 0); + if (!sample) { + dropped += 1; + return 1; + } + + sample->pid = pid; + bpf_get_current_comm(sample->comm, sizeof(sample->comm)); + sample->value = value; + + sample->seq = total; + total += 1; + + bpf_ringbuf_submit(sample, 0); + + return 0; +}