Add some basic selftests for qspinlock built over BPF arena using
cond_break_label macro.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
---
.../bpf/prog_tests/arena_spin_lock.c | 102 ++++++++++++++++++
.../selftests/bpf/progs/arena_spin_lock.c | 51 +++++++++
2 files changed, 153 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
create mode 100644 tools/testing/selftests/bpf/progs/arena_spin_lock.c
diff --git a/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
new file mode 100644
index 000000000000..2cc078ed1ddb
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
+#include <test_progs.h>
+#include <network_helpers.h>
+#include <sys/sysinfo.h>
+
+struct qspinlock { int val; };
+typedef struct qspinlock arena_spinlock_t;
+
+struct arena_qnode {
+ unsigned long next;
+ int count;
+ int locked;
+};
+
+#include "arena_spin_lock.skel.h"
+
+static long cpu;
+int *counter;
+
+static void *spin_lock_thread(void *arg)
+{
+ int err, prog_fd = *(u32 *)arg;
+ LIBBPF_OPTS(bpf_test_run_opts, topts,
+ .data_in = &pkt_v4,
+ .data_size_in = sizeof(pkt_v4),
+ .repeat = 1,
+ );
+ cpu_set_t cpuset;
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(__sync_fetch_and_add(&cpu, 1), &cpuset);
+ ASSERT_OK(pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset), "cpu affinity");
+
+ while (*READ_ONCE(counter) <= 1000) {
+ err = bpf_prog_test_run_opts(prog_fd, &topts);
+ if (!ASSERT_OK(err, "test_run err"))
+ break;
+ if (!ASSERT_EQ((int)topts.retval, 0, "test_run retval"))
+ break;
+ }
+ pthread_exit(arg);
+}
+
+static void test_arena_spin_lock_size(int size)
+{
+ LIBBPF_OPTS(bpf_test_run_opts, topts);
+ struct arena_spin_lock *skel;
+ pthread_t thread_id[16];
+ int prog_fd, i, err;
+ void *ret;
+
+ if (get_nprocs() < 2) {
+ test__skip();
+ return;
+ }
+
+ skel = arena_spin_lock__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "arena_spin_lock__open_and_load"))
+ return;
+ if (skel->data->test_skip == 2) {
+ test__skip();
+ goto end;
+ }
+ counter = &skel->bss->counter;
+ skel->bss->cs_count = size;
+
+ prog_fd = bpf_program__fd(skel->progs.prog);
+ for (i = 0; i < 16; i++) {
+ err = pthread_create(&thread_id[i], NULL, &spin_lock_thread, &prog_fd);
+ if (!ASSERT_OK(err, "pthread_create"))
+ goto end;
+ }
+
+ for (i = 0; i < 16; i++) {
+ if (!ASSERT_OK(pthread_join(thread_id[i], &ret), "pthread_join"))
+ goto end;
+ if (!ASSERT_EQ(ret, &prog_fd, "ret == prog_fd"))
+ goto end;
+ }
+end:
+ arena_spin_lock__destroy(skel);
+ return;
+}
+
+void test_arena_spin_lock(void)
+{
+ if (test__start_subtest("arena_spin_lock_1"))
+ test_arena_spin_lock_size(1);
+ cpu = 0;
+ if (test__start_subtest("arena_spin_lock_1000"))
+ test_arena_spin_lock_size(1000);
+ cpu = 0;
+ if (test__start_subtest("arena_spin_lock_10000"))
+ test_arena_spin_lock_size(10000);
+ cpu = 0;
+ if (test__start_subtest("arena_spin_lock_100000"))
+ test_arena_spin_lock_size(100000);
+ cpu = 0;
+ if (test__start_subtest("arena_spin_lock_500000"))
+ test_arena_spin_lock_size(500000);
+}
diff --git a/tools/testing/selftests/bpf/progs/arena_spin_lock.c b/tools/testing/selftests/bpf/progs/arena_spin_lock.c
new file mode 100644
index 000000000000..3e8ce807e028
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/arena_spin_lock.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
+#include <vmlinux.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+#include "bpf_arena_spin_lock.h"
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARENA);
+ __uint(map_flags, BPF_F_MMAPABLE);
+ __uint(max_entries, 100); /* number of pages */
+#ifdef __TARGET_ARCH_arm64
+ __ulong(map_extra, 0x1ull << 32); /* start of mmap() region */
+#else
+ __ulong(map_extra, 0x1ull << 44); /* start of mmap() region */
+#endif
+} arena SEC(".maps");
+
+int cs_count;
+
+#if defined(ENABLE_ATOMICS_TESTS) && defined(__BPF_FEATURE_ADDR_SPACE_CAST)
+arena_spinlock_t __arena lock;
+void *ptr;
+int test_skip = 1;
+#else
+int test_skip = 2;
+#endif
+
+int counter;
+
+SEC("tc")
+int prog(void *ctx)
+{
+ int ret = -2;
+
+#if defined(ENABLE_ATOMICS_TESTS) && defined(__BPF_FEATURE_ADDR_SPACE_CAST)
+ unsigned long flags;
+
+ ptr = &arena;
+ if ((ret = arena_spin_lock_irqsave(&lock, flags)))
+ return ret;
+ WRITE_ONCE(counter, READ_ONCE(counter) + 1);
+ bpf_repeat(cs_count);
+ ret = 0;
+ arena_spin_unlock_irqrestore(&lock, flags);
+#endif
+ return ret;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.47.1
