linux-kernel - [PATCH bpf-next v1 2/2] selftests/bpf: Add selftests for context detection kfuncs

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Message-ID: <20251022113412.352307-3-jiayuan.chen@linux.dev>
Date: Wed, 22 Oct 2025 19:33:33 +0800
From: Jiayuan Chen <jiayuan.chen@...ux.dev>
To: bpf@...r.kernel.org
Cc: Jiayuan Chen <jiayuan.chen@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH bpf-next v1 2/2] selftests/bpf: Add selftests for context detection kfuncs

Add selftests for the newly introduced context detection kfuncs.

The tests verify that each kfunc correctly identifies its respective
execution context by triggering different contexts

Signed-off-by: Jiayuan Chen <jiayuan.chen@...ux.dev>
---
 .../selftests/bpf/prog_tests/context.c        | 32 ++++++++++++++++++
 .../selftests/bpf/progs/context_prog.c        | 33 +++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/context.c
 create mode 100644 tools/testing/selftests/bpf/progs/context_prog.c

diff --git a/tools/testing/selftests/bpf/prog_tests/context.c b/tools/testing/selftests/bpf/prog_tests/context.c
new file mode 100644
index 000000000000..f09d24069941
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/context.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <error.h>
+#include <test_progs.h>
+#include "context_prog.skel.h"
+
+void test_context(void)
+{
+	struct context_prog *skel = NULL;
+
+	skel = context_prog__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "loading prog fail"))
+		return;
+
+	context_prog__attach(skel);
+	getuid();
+	sleep(5);
+
+	if (!ASSERT_EQ(1, skel->bss->in_hardirq, "hardirq not triggered"))
+		goto out;
+	if (!ASSERT_EQ(1, skel->bss->in_softriq, "softirq not triggered"))
+		goto out;
+	if (!ASSERT_EQ(1, skel->bss->in_task, "task context not triggered"))
+		goto out;
+out:
+	context_prog__destroy(skel);
+}
+
+void test_bpf_context(void)
+{
+	if (test__start_subtest("context"))
+		test_context();
+}
diff --git a/tools/testing/selftests/bpf/progs/context_prog.c b/tools/testing/selftests/bpf/progs/context_prog.c
new file mode 100644
index 000000000000..81e21f684a84
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/context_prog.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "bpf_misc.h"
+#include "bpf_experimental.h"
+
+int in_hardirq = 0;
+int in_softriq = 0;
+int in_task = 0;
+
+SEC("tp/irq/irq_handler_entry")
+int trace_irq_handler_entry(const void *ctx)
+{
+	in_hardirq = bpf_in_hardirq_context();
+	return 0;
+}
+
+SEC("tp/irq/softirq_entry")
+int trace_softirq_entry(const void *ctx)
+{
+	in_softriq = bpf_in_softirq_context();
+	return 0;
+}
+
+SEC("tp/syscalls/sys_enter_getuid")
+int trace_syscall(const void *ctx)
+{
+	in_task = bpf_in_task_context();
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";
-- 
2.43.0