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selftests/bpf: Add absolute timer test

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Add test for the absolute BPF timer under the existing timer tests. This
will run the timer two times with 1us expiration time, and then re-arm
the timer at ~35s in the future. At the end, it is verified that the
absolute timer expired exactly two times.

Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Link: https://lore.kernel.org/r/20230302114614.2985072-3-tero.kristo@linux.intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tero Kristo 2023-03-02 13:46:14 +02:00 committed by Alexei Starovoitov
parent f71f853049
commit 944459e88b
2 changed files with 48 additions and 0 deletions
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3
tools/testing/selftests/bpf/prog_tests/timer.c
View file

@ -29,6 +29,9 @@ static int timer(struct timer *timer_skel)
/* check that timer_cb2() was executed twice */
ASSERT_EQ(timer_skel->bss->bss_data, 10, "bss_data");
/* check that timer_cb3() was executed twice */
ASSERT_EQ(timer_skel->bss->abs_data, 12, "abs_data");
/* check that there were no errors in timer execution */
ASSERT_EQ(timer_skel->bss->err, 0, "err");

45
tools/testing/selftests/bpf/progs/timer.c
View file

@ -46,7 +46,15 @@ struct {
__type(value, struct elem);
} lru SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct elem);
} abs_timer SEC(".maps");
__u64 bss_data;
__u64 abs_data;
__u64 err;
__u64 ok;
__u64 callback_check = 52;
@ -284,3 +292,40 @@ int BPF_PROG2(test2, int, a, int, b)
return bpf_timer_test();
}
/* callback for absolute timer */
static int timer_cb3(void *map, int *key, struct bpf_timer *timer)
{
abs_data += 6;
if (abs_data < 12) {
bpf_timer_start(timer, bpf_ktime_get_boot_ns() + 1000,
BPF_F_TIMER_ABS);
} else {
/* Re-arm timer ~35 seconds in future */
bpf_timer_start(timer, bpf_ktime_get_boot_ns() + (1ull << 35),
BPF_F_TIMER_ABS);
}
return 0;
}
SEC("fentry/bpf_fentry_test3")
int BPF_PROG2(test3, int, a)
{
int key = 0;
struct bpf_timer *timer;
bpf_printk("test3");
timer = bpf_map_lookup_elem(&abs_timer, &key);
if (timer) {
if (bpf_timer_init(timer, &abs_timer, CLOCK_BOOTTIME) != 0)
err |= 2048;
bpf_timer_set_callback(timer, timer_cb3);
bpf_timer_start(timer, bpf_ktime_get_boot_ns() + 1000,
BPF_F_TIMER_ABS);
}
return 0;
}