From patchwork Fri Mar 15 18:28:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jose Fernandez X-Patchwork-Id: 13593863 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mail-io1-f42.google.com (mail-io1-f42.google.com [209.85.166.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C2D54F88A for ; Fri, 15 Mar 2024 18:28:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710527339; cv=none; b=KqjpPWfySn7LmMnnT/aMRLuttXRJ8t1dabetHDE5fgHQr4tki1uBEtGzStvWcnE1X8qJfhV7zkc8621s9+hw4rYu08fKKyfl6Jaz9qIQm5GiXqCOc/IWXJVwMWtO1h6M2rE+xQBYWSJhbVDWeLkmJdNTBghFgE202OvJ7WvAGNk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710527339; c=relaxed/simple; bh=ttV9IS7mXHSV0ZtQpCibNPetdR35dyL3P7pVFnt1Rd8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=B5nPHEygJAKj43dkb1hnKv36Ajz5xFC/XyQ265F60eW/W7xcZAolOGb/EV4sdkqSDCbfkHnMzBSYpZvKI9xnj7dTJrmIIZdJxYCHmepgfWUDGozMjKjDyVWtlR5VVBxnU+24RI/0LoLd6JJDaDRY26xiqpx/h9Zll9wskegYH28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=netflix.com; spf=pass smtp.mailfrom=netflix.com; dkim=pass (1024-bit key) header.d=netflix.com header.i=@netflix.com header.b=D8K8IlPE; arc=none smtp.client-ip=209.85.166.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=netflix.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=netflix.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=netflix.com header.i=@netflix.com header.b="D8K8IlPE" Received: by mail-io1-f42.google.com with SMTP id ca18e2360f4ac-7c8dd755793so71345739f.0 for ; Fri, 15 Mar 2024 11:28:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netflix.com; s=google; t=1710527334; x=1711132134; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KfZxqGfm794szzm6SQbZFvEP7H7WQ+NfmahR3rYMEb4=; b=D8K8IlPEXZOu25BFtPybWQ2xEAuj/EIu06ufGthSon+K2097ecUOUzfCT54KET6HPI 6XmQblr8Ka3KZRTJtt0kk4Qz+I9+qzNu500tjNatmCefiE5BZKzs2lS0UAt2PMOCMxdo gsBHM2q0VEGN+D/I4vpTJh5TZ7pPhJfc+zfJQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710527334; x=1711132134; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KfZxqGfm794szzm6SQbZFvEP7H7WQ+NfmahR3rYMEb4=; b=VbmeIqVP6dbZBocKLdqjZJV04GsgkTuTPQi8rksGjqz/sYIKsWx7FAbI4veA3NhC4Q RY/7b1Uz7oTNjrJFCL+qG9NxYZVdTdngQloEZq8VxGQcGU4yjAwkAm63SPJoRcFNqCK5 Zgt78KTHEt1JxWj6XdBs76ee66vFpNO3VA2l7yOB7vzr6L7huS87du/UvXXVUpVhU/+j GviH2MdDa1MhFVCspX430ut/tsSwc2z+grMVJBHfFAThlQ3fyj3kFJl5BziONy/v2pF+ IbKZikeMzXBl69jhZdkjy0PdF2G8XEitkqt1t4cP1U4twab5JCqvzcnt/xufPEMjeX/i kNmA== X-Gm-Message-State: AOJu0Yy4Bi3ndIEZI3twQ3xrb2iFh5ezvo7tRXqAvUHHSsSnMA3N53j5 PHnfjOQwYymgiqJUkDVfMiVH488PblmqOdv9vHDwHuCbkSggErD4x5SaSY6UJIE= X-Google-Smtp-Source: AGHT+IHT56pFwD1DPWvseGf1YhKPgQoet77lNXaEyjmj1UMSb6H2RIBWlwfZ3LdWLPAnX9PdX7qxJA== X-Received: by 2002:a05:6602:4914:b0:7cb:dd4a:428d with SMTP id ef20-20020a056602491400b007cbdd4a428dmr3749532iob.10.1710527334615; Fri, 15 Mar 2024 11:28:54 -0700 (PDT) Received: from localhost ([2601:285:8700:8f20:c760:7c0b:344d:cd33]) by smtp.gmail.com with UTF8SMTPSA id j1-20020a02a681000000b00476e0c80ec6sm864616jam.93.2024.03.15.11.28.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Mar 2024 11:28:54 -0700 (PDT) From: Jose Fernandez To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Jose Fernandez , Tycho Andersen Subject: [PATCH bpf-next 2/2] selftests/bpf: add selftest for btf_task_get_cgroup_id Date: Fri, 15 Mar 2024 12:28:04 -0600 Message-Id: <20240315182804.216081-2-josef@netflix.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240315182804.216081-1-josef@netflix.com> References: <20240315182804.216081-1-josef@netflix.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net This patch adds a selftest for the `bpf_task_get_cgroup_id` kfunc. The test focuses on the use case of obtaining the cgroup ID of the previous task in a `sched_switch` tracepoint. The selftest involves creating a test cgroup, attaching a BPF program that utilizes the `bpf_task_get_cgroup_id` during a `sched_switch` tracepoint, and validating that the obtained cgroup ID for the previous task matches the expected cgroup ID. task_get_cgroup_id:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Jose Fernandez Reviewed-by: Tycho Andersen --- .../bpf/prog_tests/task_get_cgroup_id.c | 58 +++++++++++++++++++ .../bpf/progs/test_task_get_cgroup_id.c | 30 ++++++++++ 2 files changed, 88 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/task_get_cgroup_id.c create mode 100644 tools/testing/selftests/bpf/progs/test_task_get_cgroup_id.c diff --git a/tools/testing/selftests/bpf/prog_tests/task_get_cgroup_id.c b/tools/testing/selftests/bpf/prog_tests/task_get_cgroup_id.c new file mode 100644 index 000000000000..b8c4551195d3 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/task_get_cgroup_id.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2024 Netflix, Inc. + +#include +#include +#include "test_task_get_cgroup_id.skel.h" +#include + +#define TEST_CGROUP "/test-task-get-cgroup-id/" + +void test_task_get_cgroup_id(void) +{ + struct test_task_get_cgroup_id *skel; + int err, fd; + pid_t pid; + __u64 cgroup_id, expected_cgroup_id; + const struct timespec req = { + .tv_sec = 1, + .tv_nsec = 0, + }; + + fd = test__join_cgroup(TEST_CGROUP); + if (!ASSERT_OK(fd < 0, "test_join_cgroup_TEST_CGROUP")) + return; + + skel = test_task_get_cgroup_id__open(); + if (!ASSERT_OK_PTR(skel, "test_task_get_cgroup_id__open")) + goto cleanup; + + err = test_task_get_cgroup_id__load(skel); + if (!ASSERT_OK(err, "test_task_get_cgroup_id__load")) + goto cleanup; + + err = test_task_get_cgroup_id__attach(skel); + if (!ASSERT_OK(err, "test_task_get_cgroup_id__attach")) + goto cleanup; + + pid = getpid(); + expected_cgroup_id = get_cgroup_id(TEST_CGROUP); + if (!ASSERT_GT(expected_cgroup_id, 0, "get_cgroup_id")) + goto cleanup; + + /* Trigger nanosleep to enter the sched_switch tracepoint */ + /* The previous task should be this process */ + syscall(__NR_nanosleep, &req, NULL); + + err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.pid_to_cgid_map), &pid, + &cgroup_id); + + if (!ASSERT_OK(err, "bpf_map_lookup_elem")) + goto cleanup; + + ASSERT_EQ(cgroup_id, expected_cgroup_id, "cgroup_id"); + +cleanup: + test_task_get_cgroup_id__destroy(skel); + close(fd); +} diff --git a/tools/testing/selftests/bpf/progs/test_task_get_cgroup_id.c b/tools/testing/selftests/bpf/progs/test_task_get_cgroup_id.c new file mode 100644 index 000000000000..7e6bc008970f --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_task_get_cgroup_id.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2024 Netflix, Inc. + +#include "vmlinux.h" +#include +#include + +u64 bpf_task_get_cgroup_id(struct task_struct *task) __ksym; + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(max_entries, 4096); + __type(key, __u32); + __type(value, __u64); +} pid_to_cgid_map SEC(".maps"); + +SEC("tp_btf/sched_switch") +int BPF_PROG(sched_switch, bool preempt, struct task_struct *prev, + struct task_struct *next) +{ + u32 pid = prev->pid; + u64 cgroup_id; + + cgroup_id = bpf_task_get_cgroup_id(prev); + bpf_map_update_elem(&pid_to_cgid_map, &pid, &cgroup_id, BPF_ANY); + + return 0; +} + +char _license[] SEC("license") = "GPL";