From patchwork Fri Sep 25 20:54:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 1371589 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=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject 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.a=rsa-sha256 header.s=facebook header.b=Olble4Yy; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Bykh85sP6z9sRf for ; Sat, 26 Sep 2020 06:55:20 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728710AbgIYUzT (ORCPT ); Fri, 25 Sep 2020 16:55:19 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:32302 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726980AbgIYUzT (ORCPT ); Fri, 25 Sep 2020 16:55:19 -0400 Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08PKroDv018423 for ; Fri, 25 Sep 2020 13:55:18 -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=plmuG3u9RX7b6czZx0ClpnZ/EksMHPGyG3ssljVKwJE=; b=Olble4YyJ3NyTFHHMgL9l59J6RKnfIjbsvXgMx7hiN5XpXtHJcY+NyARU2dLmOJVsn/M sYdyD1yj5smQ7vWBMMSwYRogBZZ4hI66xCtzsj/mxVFsy70ngZHlCeP99dwQ7frouxwW NQT8CdNV+gOsCG/MGcePsHP4poU7OpqVLjM= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 33qsp49ugd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 25 Sep 2020 13:55:17 -0700 Received: from intmgw002.03.ash8.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Fri, 25 Sep 2020 13:54:46 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id ACBF962E54A2; Fri, 25 Sep 2020 13:54:39 -0700 (PDT) From: Song Liu To: , CC: , , , , , Song Liu , Andrii Nakryiko Subject: [PATCH v6 bpf-next 1/3] bpf: enable BPF_PROG_TEST_RUN for raw_tracepoint Date: Fri, 25 Sep 2020 13:54:29 -0700 Message-ID: <20200925205432.1777-2-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200925205432.1777-1-songliubraving@fb.com> References: <20200925205432.1777-1-songliubraving@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-25_19:2020-09-24,2020-09-25 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 suspectscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009250151 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add .test_run for raw_tracepoint. Also, introduce a new feature that runs the target program on a specific CPU. This is achieved by a new flag in bpf_attr.test, BPF_F_TEST_RUN_ON_CPU. When this flag is set, the program is triggered on cpu with id bpf_attr.test.cpu. This feature is needed for BPF programs that handle perf_event and other percpu resources, as the program can access these resource locally. Acked-by: John Fastabend Acked-by: Andrii Nakryiko Signed-off-by: Song Liu --- include/linux/bpf.h | 3 ++ include/uapi/linux/bpf.h | 7 +++ kernel/bpf/syscall.c | 2 +- kernel/trace/bpf_trace.c | 1 + net/bpf/test_run.c | 91 ++++++++++++++++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 7 +++ 6 files changed, 110 insertions(+), 1 deletion(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index fc5c901c75421..efa7245ed76e0 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1381,6 +1381,9 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog, int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr); +int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, + const union bpf_attr *kattr, + union bpf_attr __user *uattr); bool btf_ctx_access(int off, int size, enum bpf_access_type type, const struct bpf_prog *prog, struct bpf_insn_access_aux *info); diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index a22812561064a..05e480f66f475 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -424,6 +424,11 @@ enum { */ #define BPF_F_QUERY_EFFECTIVE (1U << 0) +/* Flags for BPF_PROG_TEST_RUN */ + +/* If set, run the test on the cpu specified by bpf_attr.test.cpu */ +#define BPF_F_TEST_RUN_ON_CPU (1U << 0) + /* type for BPF_ENABLE_STATS */ enum bpf_stats_type { /* enabled run_time_ns and run_cnt */ @@ -566,6 +571,8 @@ union bpf_attr { */ __aligned_u64 ctx_in; __aligned_u64 ctx_out; + __u32 flags; + __u32 cpu; } test; struct { /* anonymous struct used by BPF_*_GET_*_ID */ diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 2740df19f55e9..3bc2ed2e171be 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2979,7 +2979,7 @@ static int bpf_prog_query(const union bpf_attr *attr, } } -#define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out +#define BPF_PROG_TEST_RUN_LAST_FIELD test.cpu static int bpf_prog_test_run(const union bpf_attr *attr, union bpf_attr __user *uattr) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 36508f46a8dbf..2834866d379ae 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1678,6 +1678,7 @@ const struct bpf_verifier_ops raw_tracepoint_verifier_ops = { }; const struct bpf_prog_ops raw_tracepoint_prog_ops = { + .test_run = bpf_prog_test_run_raw_tp, }; const struct bpf_verifier_ops tracing_verifier_ops = { diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index a66f211726e7c..fde5db93507c4 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -11,6 +11,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -204,6 +205,9 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog, int b = 2, err = -EFAULT; u32 retval = 0; + if (kattr->test.flags || kattr->test.cpu) + return -EINVAL; + switch (prog->expected_attach_type) { case BPF_TRACE_FENTRY: case BPF_TRACE_FEXIT: @@ -236,6 +240,87 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog, return err; } +struct bpf_raw_tp_test_run_info { + struct bpf_prog *prog; + void *ctx; + u32 retval; +}; + +static void +__bpf_prog_test_run_raw_tp(void *data) +{ + struct bpf_raw_tp_test_run_info *info = data; + + rcu_read_lock(); + migrate_disable(); + info->retval = BPF_PROG_RUN(info->prog, info->ctx); + migrate_enable(); + rcu_read_unlock(); +} + +int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, + const union bpf_attr *kattr, + union bpf_attr __user *uattr) +{ + void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); + __u32 ctx_size_in = kattr->test.ctx_size_in; + struct bpf_raw_tp_test_run_info info; + int cpu = kattr->test.cpu, err = 0; + + /* doesn't support data_in/out, ctx_out, duration, or repeat */ + if (kattr->test.data_in || kattr->test.data_out || + kattr->test.ctx_out || kattr->test.duration || + kattr->test.repeat) + return -EINVAL; + + if (ctx_size_in < prog->aux->max_ctx_offset) + return -EINVAL; + + if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0) + return -EINVAL; + + if (ctx_size_in) { + info.ctx = kzalloc(ctx_size_in, GFP_USER); + if (!info.ctx) + return -ENOMEM; + if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) { + err = -EFAULT; + goto out; + } + } else { + info.ctx = NULL; + } + + info.prog = prog; + + if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 || + cpu == smp_processor_id()) { + __bpf_prog_test_run_raw_tp(&info); + } else { + /* smp_call_function_single() also checks cpu_online() + * after csd_lock(). However, since cpu is from user + * space, let's do an extra quick check to filter out + * invalid value before smp_call_function_single(). + */ + if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { + err = -ENXIO; + goto out; + } + + err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp, + &info, 1); + if (err) + goto out; + } + + if (copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32))) + err = -EFAULT; + +out: + kfree(info.ctx); + return err; +} + static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size) { void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in); @@ -410,6 +495,9 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, void *data; int ret; + if (kattr->test.flags || kattr->test.cpu) + return -EINVAL; + data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN, SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); if (IS_ERR(data)) @@ -607,6 +695,9 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR) return -EINVAL; + if (kattr->test.flags || kattr->test.cpu) + return -EINVAL; + if (size < ETH_HLEN) return -EINVAL; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index a22812561064a..05e480f66f475 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -424,6 +424,11 @@ enum { */ #define BPF_F_QUERY_EFFECTIVE (1U << 0) +/* Flags for BPF_PROG_TEST_RUN */ + +/* If set, run the test on the cpu specified by bpf_attr.test.cpu */ +#define BPF_F_TEST_RUN_ON_CPU (1U << 0) + /* type for BPF_ENABLE_STATS */ enum bpf_stats_type { /* enabled run_time_ns and run_cnt */ @@ -566,6 +571,8 @@ union bpf_attr { */ __aligned_u64 ctx_in; __aligned_u64 ctx_out; + __u32 flags; + __u32 cpu; } test; struct { /* anonymous struct used by BPF_*_GET_*_ID */ From patchwork Fri Sep 25 20:54:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 1371587 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; 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Fri, 25 Sep 2020 13:54:44 -0700 (PDT) From: Song Liu To: , CC: , , , , , Song Liu , Andrii Nakryiko Subject: [PATCH v6 bpf-next 2/3] libbpf: support test run of raw tracepoint programs Date: Fri, 25 Sep 2020 13:54:30 -0700 Message-ID: <20200925205432.1777-3-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200925205432.1777-1-songliubraving@fb.com> References: <20200925205432.1777-1-songliubraving@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-25_19:2020-09-24,2020-09-25 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 adultscore=0 mlxscore=0 bulkscore=0 spamscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009250151 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add bpf_prog_test_run_opts() with support of new fields in bpf_attr.test, namely, flags and cpu. Also extend _opts operations to support outputs via opts. Acked-by: Andrii Nakryiko Signed-off-by: Song Liu --- tools/lib/bpf/bpf.c | 31 +++++++++++++++++++++++++++++++ tools/lib/bpf/bpf.h | 26 ++++++++++++++++++++++++++ tools/lib/bpf/libbpf.map | 1 + tools/lib/bpf/libbpf_internal.h | 5 +++++ 4 files changed, 63 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 2baa1308737c8..c5a4d8444bf68 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -712,6 +712,37 @@ int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) return ret; } +int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) +{ + union bpf_attr attr; + int ret; + + if (!OPTS_VALID(opts, bpf_test_run_opts)) + return -EINVAL; + + memset(&attr, 0, sizeof(attr)); + attr.test.prog_fd = prog_fd; + attr.test.cpu = OPTS_GET(opts, cpu, 0); + attr.test.flags = OPTS_GET(opts, flags, 0); + attr.test.repeat = OPTS_GET(opts, repeat, 0); + attr.test.duration = OPTS_GET(opts, duration, 0); + attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); + attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); + attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); + attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); + attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); + attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); + attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); + attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); + + ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); + OPTS_SET(opts, data_size_out, attr.test.data_size_out); + OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); + OPTS_SET(opts, duration, attr.test.duration); + OPTS_SET(opts, retval, attr.test.retval); + return ret; +} + static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) { union bpf_attr attr; diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 8c1ac4b42f908..4f3568e55527c 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -251,6 +251,32 @@ struct bpf_prog_bind_opts { LIBBPF_API int bpf_prog_bind_map(int prog_fd, int map_fd, const struct bpf_prog_bind_opts *opts); + +struct bpf_test_run_opts { + size_t sz; /* size of this struct for forward/backward compatibility */ + const void *data_in; /* optional */ + void *data_out; /* optional */ + __u32 data_size_in; + __u32 data_size_out; /* in: max length of data_out + * out: length of data_out + */ + const void *ctx_in; /* optional */ + void *ctx_out; /* optional */ + __u32 ctx_size_in; + __u32 ctx_size_out; /* in: max length of ctx_out + * out: length of cxt_out + */ + __u32 retval; /* out: return code of the BPF program */ + int repeat; + __u32 duration; /* out: average per repetition in ns */ + __u32 flags; + __u32 cpu; +}; +#define bpf_test_run_opts__last_field cpu + +LIBBPF_API int bpf_prog_test_run_opts(int prog_fd, + struct bpf_test_run_opts *opts); + #ifdef __cplusplus } /* extern "C" */ #endif diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 5f054dadf0829..0623e7a99b1ec 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -303,6 +303,7 @@ LIBBPF_0.1.0 { LIBBPF_0.2.0 { global: bpf_prog_bind_map; + bpf_prog_test_run_opts; bpf_program__section_name; perf_buffer__buffer_cnt; perf_buffer__buffer_fd; diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index 4d1c366fca2ca..d2fff18f4cd12 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -136,6 +136,11 @@ static inline bool libbpf_validate_opts(const char *opts, ((opts) && opts->sz >= offsetofend(typeof(*(opts)), field)) #define OPTS_GET(opts, field, fallback_value) \ (OPTS_HAS(opts, field) ? (opts)->field : fallback_value) +#define OPTS_SET(opts, field, value) \ + do { \ + if (OPTS_HAS(opts, field)) \ + (opts)->field = value; \ + } while (0) int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz); int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz); From patchwork Fri Sep 25 20:54:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 1371588 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=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject 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.a=rsa-sha256 header.s=facebook header.b=XJWceLv8; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Bykh36VTcz9sRf for ; Sat, 26 Sep 2020 06:55:15 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728612AbgIYUzP (ORCPT ); Fri, 25 Sep 2020 16:55:15 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:28884 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726980AbgIYUzO (ORCPT ); Fri, 25 Sep 2020 16:55:14 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08PKsA7F014836 for ; Fri, 25 Sep 2020 13:55:14 -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=9FoxGNmt0l80dPBqmmEMu9amF2HkYuE/ikSDpJSYISc=; b=XJWceLv8yoS89g3FR0Il2kj/uR7OmDD39J6Dj+Jaay92VlCQq07yZHzoDgiczr3HMycO k8KRnxneUABniDQ5UrGZGybf5SzzC4bqfaq5hI6eiNsjpw03QDyaRIVngWyzKkQeLfm4 XCxEW4u2/VXHSYMMYzmTqT4wNfPbcBZatfM= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 33qsp69x05-8 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 25 Sep 2020 13:55:14 -0700 Received: from intmgw004.08.frc2.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 15.1.1979.3; Fri, 25 Sep 2020 13:54:52 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id F410062E54A2; Fri, 25 Sep 2020 13:54:49 -0700 (PDT) From: Song Liu To: , CC: , , , , , Song Liu , Andrii Nakryiko Subject: [PATCH v6 bpf-next 3/3] selftests/bpf: add raw_tp_test_run Date: Fri, 25 Sep 2020 13:54:31 -0700 Message-ID: <20200925205432.1777-4-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200925205432.1777-1-songliubraving@fb.com> References: <20200925205432.1777-1-songliubraving@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-09-25_19:2020-09-24,2020-09-25 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 mlxlogscore=999 clxscore=1015 suspectscore=2 impostorscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 spamscore=0 priorityscore=1501 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009250151 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This test runs test_run for raw_tracepoint program. The test covers ctx input, retval output, and running on correct cpu. Acked-by: Andrii Nakryiko Signed-off-by: Song Liu --- .../bpf/prog_tests/raw_tp_test_run.c | 96 +++++++++++++++++++ .../bpf/progs/test_raw_tp_test_run.c | 24 +++++ 2 files changed, 120 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c create mode 100644 tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c diff --git a/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c b/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c new file mode 100644 index 0000000000000..c5fb191874acf --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2019 Facebook */ +#include +#include +#include "bpf/libbpf_internal.h" +#include "test_raw_tp_test_run.skel.h" + +static int duration; + +void test_raw_tp_test_run(void) +{ + struct bpf_prog_test_run_attr test_attr = {}; + int comm_fd = -1, err, nr_online, i, prog_fd; + __u64 args[2] = {0x1234ULL, 0x5678ULL}; + int expected_retval = 0x1234 + 0x5678; + struct test_raw_tp_test_run *skel; + char buf[] = "new_name"; + bool *online = NULL; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .ctx_in = args, + .ctx_size_in = sizeof(args), + .flags = BPF_F_TEST_RUN_ON_CPU, + ); + + err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online, + &nr_online); + if (CHECK(err, "parse_cpu_mask_file", "err %d\n", err)) + return; + + skel = test_raw_tp_test_run__open_and_load(); + if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) + goto cleanup; + + err = test_raw_tp_test_run__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err)) + goto cleanup; + + comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); + if (CHECK(comm_fd < 0, "open /proc/self/comm", "err %d\n", errno)) + goto cleanup; + + err = write(comm_fd, buf, sizeof(buf)); + CHECK(err < 0, "task rename", "err %d", errno); + + CHECK(skel->bss->count == 0, "check_count", "didn't increase\n"); + CHECK(skel->data->on_cpu != 0xffffffff, "check_on_cpu", "got wrong value\n"); + + prog_fd = bpf_program__fd(skel->progs.rename); + test_attr.prog_fd = prog_fd; + test_attr.ctx_in = args; + test_attr.ctx_size_in = sizeof(__u64); + + err = bpf_prog_test_run_xattr(&test_attr); + CHECK(err == 0, "test_run", "should fail for too small ctx\n"); + + test_attr.ctx_size_in = sizeof(args); + err = bpf_prog_test_run_xattr(&test_attr); + CHECK(err < 0, "test_run", "err %d\n", errno); + CHECK(test_attr.retval != expected_retval, "check_retval", + "expect 0x%x, got 0x%x\n", expected_retval, test_attr.retval); + + for (i = 0; i < nr_online; i++) { + if (!online[i]) + continue; + + opts.cpu = i; + opts.retval = 0; + err = bpf_prog_test_run_opts(prog_fd, &opts); + CHECK(err < 0, "test_run_opts", "err %d\n", errno); + CHECK(skel->data->on_cpu != i, "check_on_cpu", + "expect %d got %d\n", i, skel->data->on_cpu); + CHECK(opts.retval != expected_retval, + "check_retval", "expect 0x%x, got 0x%x\n", + expected_retval, opts.retval); + } + + /* invalid cpu ID should fail with ENXIO */ + opts.cpu = 0xffffffff; + err = bpf_prog_test_run_opts(prog_fd, &opts); + CHECK(err != -1 || errno != ENXIO, + "test_run_opts_fail", + "should failed with ENXIO\n"); + + /* non-zero cpu w/o BPF_F_TEST_RUN_ON_CPU should fail with EINVAL */ + opts.cpu = 1; + opts.flags = 0; + err = bpf_prog_test_run_opts(prog_fd, &opts); + CHECK(err != -1 || errno != EINVAL, + "test_run_opts_fail", + "should failed with EINVAL\n"); + +cleanup: + close(comm_fd); + test_raw_tp_test_run__destroy(skel); + free(online); +} diff --git a/tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c b/tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c new file mode 100644 index 0000000000000..1521853597d70 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include "vmlinux.h" +#include +#include + +__u32 count = 0; +__u32 on_cpu = 0xffffffff; + +SEC("raw_tp/task_rename") +int BPF_PROG(rename, struct task_struct *task, char *comm) +{ + + count++; + if ((__u64) task == 0x1234ULL && (__u64) comm == 0x5678ULL) { + on_cpu = bpf_get_smp_processor_id(); + return (int)task + (int)comm; + } + + return 0; +} + +char _license[] SEC("license") = "GPL";