From patchwork Thu Nov 7 21:12:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 13867171 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D97301CF7BB for ; Thu, 7 Nov 2024 21:12:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731013978; cv=none; b=A4Eau49mqbmugGV045fyFT7hSnunLVXrH9dQsHgEw/UVykml8gZWRmiKeS5fdIxfA2ASQ1PdWS91bW5bQMeEcdQ4Ih+/SNNlh3bwSe/zukhgFrIlagcOWQD09Ywxt5/LbGbwRdXT+KXgnN1LgXhzq6DgzQthdtn5eQLTffIzTf4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731013978; c=relaxed/simple; bh=q2zm7XhpWXgczVLTp50flukPx5I2rnMRsgcIbA/JdIM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=heGdWT4nCk/X30KM0BsCD02TIaInHYt7LzmOHVV16r2DQSSujz7Tc03TI/ps/4fGj1+fqwF21vs1i+8gqzBZDWLivHk4Pho8DJmrV9lvjbrQx+GS9cGC0NC3SFB7OCiq/3jyUn4u9cv8S2V8/UFzF4+kEjWgMoTa78bJ+uqpVbM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=G3KE1ns5; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="G3KE1ns5" Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.18.1.2/8.18.1.2) with ESMTP id 4A7KC9ab025532; Thu, 7 Nov 2024 13:12:30 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2021-q4; bh=B445bxnRd7VbM2XZKpHtwArCnEdBMewd+pcv5w8IaSQ=; b=G3KE1ns5UxY3 9mPXocvEH+JgwZRE37WoqZYfeJcBpcFvziibeEQT7LvbERBPibhJYqhKRCyv++WC biHpShKh4hAjcl2JNEgA9SAOV5Xg3OoEPKIfmyAECcXRr512QHsXcfWLWA4MyJuI krZOM79LJoPK9Qq51zfjTYqj+yfG+1PJT+uBWCl9wcF8226ANOviM+0/5DzWLNR4 B9XQ9U+KQ+kgilJJ29uvkWgFBTY3n1ZxvZ6S4NMnqfuFpGqW+VyHfxTsOR+w/MT1 RLfswj29SbpqCRsJSb2ZiCpY9namaNGgD46bcdjp90hTXtxwKL3uKA+/vtImaAQu dZjGLsyttg== Received: from mail.thefacebook.com ([163.114.134.16]) by m0089730.ppops.net (PPS) with ESMTPS id 42s12waa00-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 07 Nov 2024 13:12:30 -0800 (PST) Received: from devvm4158.cln0.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c08b:78::c78f) with Microsoft SMTP Server id 15.2.1544.11; Thu, 7 Nov 2024 21:12:26 +0000 From: Vadim Fedorenko To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Thomas Gleixner , Vadim Fedorenko , Mykola Lysenko , Jakub Kicinski CC: , , Vadim Fedorenko , Martin KaFai Lau Subject: [PATCH bpf-next v4 4/4] selftests/bpf: add usage example for cpu cycles kfuncs Date: Thu, 7 Nov 2024 13:12:06 -0800 Message-ID: <20241107211206.2814069-4-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241107211206.2814069-1-vadfed@meta.com> References: <20241107211206.2814069-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: WZb6L7EBjKHRR-RKtJ-M_jp7Q36w-yzD X-Proofpoint-ORIG-GUID: WZb6L7EBjKHRR-RKtJ-M_jp7Q36w-yzD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 X-Patchwork-Delegate: bpf@iogearbox.net The selftest provides an example of how to measure the latency of bpf kfunc/helper call in cycles and nanoseconds. Signed-off-by: Vadim Fedorenko --- .../bpf/prog_tests/test_cpu_cycles.c | 35 +++++++++++++++++++ .../selftests/bpf/progs/test_cpu_cycles.c | 25 +++++++++++++ 2 files changed, 60 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c create mode 100644 tools/testing/selftests/bpf/progs/test_cpu_cycles.c diff --git a/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c b/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c new file mode 100644 index 000000000000..d7f3b66594b3 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_cpu_cycles.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Inc. */ + +#include +#include "test_cpu_cycles.skel.h" + +static void cpu_cycles(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, opts); + struct test_cpu_cycles *skel; + int err, pfd; + + skel = test_cpu_cycles__open_and_load(); + if (!ASSERT_OK_PTR(skel, "test_cpu_cycles open and load")) + return; + + pfd = bpf_program__fd(skel->progs.bpf_cpu_cycles); + if (!ASSERT_GT(pfd, 0, "test_cpu_cycles fd")) + goto fail; + + err = bpf_prog_test_run_opts(pfd, &opts); + if (!ASSERT_OK(err, "test_cpu_cycles test run")) + goto fail; + + ASSERT_NEQ(skel->bss->cycles, 0, "test_cpu_cycles 0 cycles"); + ASSERT_NEQ(skel->bss->ns, 0, "test_cpu_cycles 0 ns"); +fail: + test_cpu_cycles__destroy(skel); +} + +void test_cpu_cycles(void) +{ + if (test__start_subtest("cpu_cycles")) + cpu_cycles(); +} diff --git a/tools/testing/selftests/bpf/progs/test_cpu_cycles.c b/tools/testing/selftests/bpf/progs/test_cpu_cycles.c new file mode 100644 index 000000000000..48762f07ad7f --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_cpu_cycles.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Inc. */ + +#include "vmlinux.h" +#include + +extern u64 bpf_cpu_cycles_to_ns(u64 cycles) __weak __ksym; +extern u64 bpf_get_cpu_cycles(void) __weak __ksym; + +__u64 cycles, ns; + +SEC("syscall") +int bpf_cpu_cycles(void) +{ + struct bpf_pidns_info pidns; + __u64 start; + + start = bpf_get_cpu_cycles(); + bpf_get_ns_current_pid_tgid(0, 0, &pidns, sizeof(struct bpf_pidns_info)); + cycles = bpf_get_cpu_cycles() - start; + ns = bpf_cpu_cycles_to_ns(cycles); + return 0; +} + +char _license[] SEC("license") = "GPL";