From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-178.mta0.migadu.com (out-178.mta0.migadu.com [91.218.175.178]) (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 B76263EC2EA; Mon, 8 Jun 2026 14:53:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780930406; cv=none; b=nqvdItRBjwMpkgzrjqovB9r8sHeh3hEzu6ydn67InUJwV37ewI9ncK63Y1RWL4XHENxu9JjMYDP6SBBIkDf0mXc4WVPjGFfVwPZN0MxEjrKFa2MiN6MlL0NrDcwQej7iTf95cmfjDLFS5q+yQwpLP3W4XIUr18XeQE1ZBmX19jg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780930406; c=relaxed/simple; bh=Pl7tYw4HIb7Q4Al7iFy0KP1+3bJ5bnGm7Psh7CNKj78=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pPoIUFy43syH9CYlYcyPcIQ9Qi3tjm2GdYljvBiwii1kcD374mX7A0ZpyXHcKO5lCoIRgIQvkrYu7QndiZVGWQu2WynEOQ5Mm6fSBURIWcLwcgUEzh/r4HeBUmiJvO341zw20NuVWT3oKis9MaZD+Z1bXwIAGuK8sGVeb/E00o0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=IyGeyX86; arc=none smtp.client-ip=91.218.175.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="IyGeyX86" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780930401; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/YipO/dVbEf/rkjPdFkXbR7ai/n9Yp+2D4IvUsZ6fnQ=; b=IyGeyX86qW2NcXufPVn7ZV2UXTi83hg0Ri+Z9+964IZcDSW95CcQ5ZgliHxGEawJaUIMao BBgn0ZPz+DGESJTQwHe/kvtUDV8yqWloKMDh4C1i+jq93IsGyeoyEAqawRTO+KLVMfKGkW oPEgAejkoqNJ1HJ8NLaHwYj+NS91UBQ= From: Leon Hwang To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Kumar Kartikeya Dwivedi , Song Liu , Yonghong Song , Jiri Olsa , John Fastabend , Quentin Monnet , Shuah Khan , Leon Hwang , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-patches-bot@fb.com Subject: [PATCH bpf-next v5 9/9] selftests/bpf: Add test to verify bpf_iter for global percpu data Date: Mon, 8 Jun 2026 22:51:13 +0800 Message-ID: <20260608145113.65857-10-leon.hwang@linux.dev> In-Reply-To: <20260608145113.65857-1-leon.hwang@linux.dev> References: <20260608145113.65857-1-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Add a test to verify that it is OK to iter the percpu_array map used for global percpu data. Signed-off-by: Leon Hwang --- .../bpf/prog_tests/global_data_init.c | 52 +++++++++++++++++++ .../bpf/progs/test_global_percpu_data.c | 25 +++++++++ 2 files changed, 77 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c index c3b9423246b5..6c1813ffe5f3 100644 --- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c +++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c @@ -333,6 +333,56 @@ static void test_global_percpu_data_xlated(void) free(insns); } +static void test_global_percpu_data_iter(void) +{ + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + struct test_global_percpu_data *skel; + union bpf_iter_link_info linfo = {}; + struct bpf_link *link = NULL; + int fd, num_cpus, len, err; + char buf[16]; + + num_cpus = libbpf_num_possible_cpus(); + if (!ASSERT_GT(num_cpus, 0, "libbpf_num_possible_cpus")) + return; + + skel = test_global_percpu_data__open(); + if (!ASSERT_OK_PTR(skel, "test_global_percpu_data__open")) + return; + + skel->rodata->num_cpus = num_cpus; + skel->rodata->offsetof_num = offsetof(struct test_global_percpu_data__percpu, struct_data); + skel->rodata->offsetof_num += sizeof(skel->percpu->struct_data) - sizeof(int); + skel->rodata->elem_sz = roundup(sizeof(struct test_global_percpu_data__percpu), 8); + skel->percpu->struct_data.nums[6] = 0xc0de; + + err = test_global_percpu_data__load(skel); + if (!ASSERT_OK(err, "test_global_percpu_data__load")) + goto out; + + linfo.map.map_fd = bpf_map__fd(skel->maps.percpu); + opts.link_info = &linfo; + opts.link_info_len = sizeof(linfo); + link = bpf_program__attach_iter(skel->progs.dump_percpu_data, &opts); + if (!ASSERT_OK_PTR(link, "bpf_program__attach_iter")) + goto out; + + fd = bpf_iter_create(bpf_link__fd(link)); + if (!ASSERT_GE(fd, 0, "bpf_iter_create")) + goto out; + + while ((len = read(fd, buf, sizeof(buf))) > 0) + do { } while (0); + ASSERT_EQ(len, 0, "read iter"); + ASSERT_TRUE(skel->bss->run_iter, "run_iter"); + ASSERT_EQ(skel->bss->percpu_data_sum, 0xc0de * num_cpus, "percpu_data_sum"); + + close(fd); +out: + bpf_link__destroy(link); + test_global_percpu_data__destroy(skel); +} + void test_global_percpu_data(void) { if (!feat_supported(NULL, FEAT_PERCPU_DATA)) { @@ -348,4 +398,6 @@ void test_global_percpu_data(void) test_global_percpu_data_verifier_log(); if (test__start_subtest("xlated")) test_global_percpu_data_xlated(); + if (test__start_subtest("iter")) + test_global_percpu_data_iter(); } diff --git a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c index 9a1b1a314c2f..037c8a05be4b 100644 --- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c +++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c @@ -62,4 +62,29 @@ int verifier_percpu_read(void *ctx) return c == ' '; } +volatile const __u32 num_cpus = 0; +volatile const int offsetof_num; +volatile const int elem_sz; +__u32 percpu_data_sum = 0; +bool run_iter = false; + +SEC("iter/bpf_map_elem") +__auxiliary +int dump_percpu_data(struct bpf_iter__bpf_map_elem *ctx) +{ + void *pptr = ctx->value; + int i; + + if (!pptr) + return 0; + + run_iter = true; + + for (i = 0; i < num_cpus; i++) { + percpu_data_sum += *(int *) (pptr + offsetof_num); + pptr += elem_sz; + } + return 0; +} + char _license[] SEC("license") = "GPL"; -- 2.54.0