selftests/bpf: Add selftest suite for cpumask kfuncs

A recent patch added a new set of kfuncs for allocating, freeing,
manipulating, and querying cpumasks. This patch adds a new 'cpumask'
selftest suite which verifies their behavior.

Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230125143816.721952-5-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 74 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/cpumask.c b/tools/testing/selftests/bpf/prog_tests/cpumask.c
new file mode 100644
index 000000000000..5fbe457c4ebe
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/cpumask.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#include <test_progs.h>
+#include "cpumask_failure.skel.h"
+#include "cpumask_success.skel.h"
+
+static const char * const cpumask_success_testcases[] = {
+	"test_alloc_free_cpumask",
+	"test_set_clear_cpu",
+	"test_setall_clear_cpu",
+	"test_first_firstzero_cpu",
+	"test_test_and_set_clear",
+	"test_and_or_xor",
+	"test_intersects_subset",
+	"test_copy_any_anyand",
+	"test_insert_leave",
+	"test_insert_remove_release",
+	"test_insert_kptr_get_release",
+};
+
+static void verify_success(const char *prog_name)
+{
+	struct cpumask_success *skel;
+	struct bpf_program *prog;
+	struct bpf_link *link = NULL;
+	pid_t child_pid;
+	int status;
+
+	skel = cpumask_success__open();
+	if (!ASSERT_OK_PTR(skel, "cpumask_success__open"))
+		return;
+
+	skel->bss->pid = getpid();
+	skel->bss->nr_cpus = libbpf_num_possible_cpus();
+
+	cpumask_success__load(skel);
+	if (!ASSERT_OK_PTR(skel, "cpumask_success__load"))
+		goto cleanup;
+
+	prog = bpf_object__find_program_by_name(skel->obj, prog_name);
+	if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
+		goto cleanup;
+
+	link = bpf_program__attach(prog);
+	if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
+		goto cleanup;
+
+	child_pid = fork();
+	if (!ASSERT_GT(child_pid, -1, "child_pid"))
+		goto cleanup;
+	if (child_pid == 0)
+		_exit(0);
+	waitpid(child_pid, &status, 0);
+	ASSERT_OK(skel->bss->err, "post_wait_err");
+
+cleanup:
+	bpf_link__destroy(link);
+	cpumask_success__destroy(skel);
+}
+
+void test_cpumask(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cpumask_success_testcases); i++) {
+		if (!test__start_subtest(cpumask_success_testcases[i]))
+			continue;
+
+		verify_success(cpumask_success_testcases[i]);
+	}
+
+	RUN_TESTS(cpumask_failure);
+}