From: Alexei Starovoitov <ast@xxxxxxxxxx>
Check that map-in-map supports bpf timers.
Check that indirect "recursion" of timer callbacks works:
timer_cb1() { bpf_timer_set_callback(timer_cb2); }
timer_cb2() { bpf_timer_set_callback(timer_cb1); }
Check that
bpf_map_release
htab_free_prealloced_timers
bpf_timer_cancel_and_free
hrtimer_cancel
works while timer cb is running.
"while true; do ./test_progs -t timer_mim; done"
is a great stress test. It caught missing timer cancel in htab->extra_elems.
timer_mim_reject.c is a negative test that checks
that timer<->map mismatch is prevented.
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
.../selftests/bpf/prog_tests/timer_mim.c | 69 +++++++++++++++
tools/testing/selftests/bpf/progs/timer_mim.c | 88 +++++++++++++++++++
.../selftests/bpf/progs/timer_mim_reject.c | 74 ++++++++++++++++
3 files changed, 231 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/timer_mim.c
create mode 100644 tools/testing/selftests/bpf/progs/timer_mim.c
create mode 100644 tools/testing/selftests/bpf/progs/timer_mim_reject.c
diff --git a/tools/testing/selftests/bpf/prog_tests/timer_mim.c b/tools/testing/selftests/bpf/prog_tests/timer_mim.c
new file mode 100644
index 000000000000..f5acbcbe33a4
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/timer_mim.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <test_progs.h>
+#include "timer_mim.skel.h"
+#include "timer_mim_reject.skel.h"
+
+static int timer_mim(struct timer_mim *timer_skel)
+{
+ __u32 duration = 0, retval;
+ __u64 cnt1, cnt2;
+ int err, prog_fd, key1 = 1;
+
+ err = timer_mim__attach(timer_skel);
+ if (!ASSERT_OK(err, "timer_attach"))
+ return err;
+
+ prog_fd = bpf_program__fd(timer_skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
+ NULL, NULL, &retval, &duration);
+ ASSERT_OK(err, "test_run");
+ ASSERT_EQ(retval, 0, "test_run");
+ timer_mim__detach(timer_skel);
+
+ /* check that timer_cb[12] are incrementing 'cnt' */
+ cnt1 = READ_ONCE(timer_skel->bss->cnt);
+ usleep(200); /* 100 times more than interval */
+ cnt2 = READ_ONCE(timer_skel->bss->cnt);
+ ASSERT_GT(cnt2, cnt1, "cnt");
+
+ ASSERT_EQ(timer_skel->bss->err, 0, "err");
+ /* check that code paths completed */
+ ASSERT_EQ(timer_skel->bss->ok, 1 | 2, "ok");
+
+ close(bpf_map__fd(timer_skel->maps.inner_htab));
+ err = bpf_map_delete_elem(bpf_map__fd(timer_skel->maps.outer_arr), &key1);
+ ASSERT_EQ(err, 0, "delete inner map");
+
+ /* check that timer_cb[12] are no longer running */
+ cnt1 = READ_ONCE(timer_skel->bss->cnt);
+ usleep(200);
+ cnt2 = READ_ONCE(timer_skel->bss->cnt);
+ ASSERT_EQ(cnt2, cnt1, "cnt");
+
+ return 0;
+}
+
+void test_timer_mim(void)
+{
+ struct timer_mim_reject *timer_reject_skel = NULL;
+ libbpf_print_fn_t old_print_fn = NULL;
+ struct timer_mim *timer_skel = NULL;
+ int err;
+
+ old_print_fn = libbpf_set_print(NULL);
+ timer_reject_skel = timer_mim_reject__open_and_load();
+ libbpf_set_print(old_print_fn);
+ if (!ASSERT_ERR_PTR(timer_reject_skel, "timer_reject_skel_load"))
+ goto cleanup;
+
+ timer_skel = timer_mim__open_and_load();
+ if (!ASSERT_OK_PTR(timer_skel, "timer_skel_load"))
+ goto cleanup;
+
+ err = timer_mim(timer_skel);
+ ASSERT_OK(err, "timer_mim");
+cleanup:
+ timer_mim__destroy(timer_skel);
+ timer_mim_reject__destroy(timer_reject_skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/timer_mim.c b/tools/testing/selftests/bpf/progs/timer_mim.c
new file mode 100644
index 000000000000..2fee7ab105ef
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/timer_mim.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <linux/bpf.h>
+#include <time.h>
+#include <errno.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_tcp_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+struct hmap_elem {
+ int pad; /* unused */
+ struct bpf_timer timer;
+};
+
+struct inner_map {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(max_entries, 1024);
+ __type(key, int);
+ __type(value, struct hmap_elem);
+} inner_htab SEC(".maps");
+
+#define ARRAY_KEY 1
+#define HASH_KEY 1234
+
+struct outer_arr {
+ __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
+ __uint(max_entries, 2);
+ __uint(key_size, sizeof(int));
+ __uint(value_size, sizeof(int));
+ __array(values, struct inner_map);
+} outer_arr SEC(".maps") = {
+ .values = { [ARRAY_KEY] = &inner_htab },
+};
+
+__u64 err;
+__u64 ok;
+__u64 cnt;
+
+static int timer_cb1(void *map, int *key, struct hmap_elem *val);
+
+static int timer_cb2(void *map, int *key, struct hmap_elem *val)
+{
+ cnt++;
+ bpf_timer_set_callback(&val->timer, timer_cb1);
+ if (bpf_timer_start(&val->timer, 1000, 0))
+ err |= 1;
+ ok |= 1;
+ return 0;
+}
+
+/* callback for inner hash map */
+static int timer_cb1(void *map, int *key, struct hmap_elem *val)
+{
+ cnt++;
+ bpf_timer_set_callback(&val->timer, timer_cb2);
+ if (bpf_timer_start(&val->timer, 1000, 0))
+ err |= 2;
+ /* Do a lookup to make sure 'map' and 'key' pointers are correct */
+ bpf_map_lookup_elem(map, key);
+ ok |= 2;
+ return 0;
+}
+
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(test1, int a)
+{
+ struct hmap_elem init = {};
+ struct bpf_map *inner_map;
+ struct hmap_elem *val;
+ int array_key = ARRAY_KEY;
+ int hash_key = HASH_KEY;
+
+ inner_map = bpf_map_lookup_elem(&outer_arr, &array_key);
+ if (!inner_map)
+ return 0;
+
+ bpf_map_update_elem(inner_map, &hash_key, &init, 0);
+ val = bpf_map_lookup_elem(inner_map, &hash_key);
+ if (!val)
+ return 0;
+
+ bpf_timer_init(&val->timer, inner_map, CLOCK_MONOTONIC);
+ if (bpf_timer_set_callback(&val->timer, timer_cb1))
+ err |= 4;
+ if (bpf_timer_start(&val->timer, 0, 0))
+ err |= 8;
+ return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/timer_mim_reject.c b/tools/testing/selftests/bpf/progs/timer_mim_reject.c
new file mode 100644
index 000000000000..5d648e3d8a41
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/timer_mim_reject.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <linux/bpf.h>
+#include <time.h>
+#include <errno.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_tcp_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+struct hmap_elem {
+ int pad; /* unused */
+ struct bpf_timer timer;
+};
+
+struct inner_map {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(max_entries, 1024);
+ __type(key, int);
+ __type(value, struct hmap_elem);
+} inner_htab SEC(".maps");
+
+#define ARRAY_KEY 1
+#define ARRAY_KEY2 2
+#define HASH_KEY 1234
+
+struct outer_arr {
+ __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
+ __uint(max_entries, 2);
+ __uint(key_size, sizeof(int));
+ __uint(value_size, sizeof(int));
+ __array(values, struct inner_map);
+} outer_arr SEC(".maps") = {
+ .values = { [ARRAY_KEY] = &inner_htab },
+};
+
+__u64 err;
+__u64 ok;
+__u64 cnt;
+
+/* callback for inner hash map */
+static int timer_cb(void *map, int *key, struct hmap_elem *val)
+{
+ return 0;
+}
+
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(test1, int a)
+{
+ struct hmap_elem init = {};
+ struct bpf_map *inner_map, *inner_map2;
+ struct hmap_elem *val;
+ int array_key = ARRAY_KEY;
+ int array_key2 = ARRAY_KEY2;
+ int hash_key = HASH_KEY;
+
+ inner_map = bpf_map_lookup_elem(&outer_arr, &array_key);
+ if (!inner_map)
+ return 0;
+
+ inner_map2 = bpf_map_lookup_elem(&outer_arr, &array_key2);
+ if (!inner_map2)
+ return 0;
+ bpf_map_update_elem(inner_map, &hash_key, &init, 0);
+ val = bpf_map_lookup_elem(inner_map, &hash_key);
+ if (!val)
+ return 0;
+
+ bpf_timer_init(&val->timer, inner_map2, CLOCK_MONOTONIC);
+ if (bpf_timer_set_callback(&val->timer, timer_cb))
+ err |= 4;
+ if (bpf_timer_start(&val->timer, 0, 0))
+ err |= 8;
+ return 0;
+}
--
2.30.2
