* [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time
@ 2020-03-14 0:27 Andrii Nakryiko
2020-03-14 0:34 ` Martin KaFai Lau
2020-03-17 18:56 ` Daniel Borkmann
0 siblings, 2 replies; 3+ messages in thread
From: Andrii Nakryiko @ 2020-03-14 0:27 UTC (permalink / raw)
To: bpf, netdev, ast, daniel; +Cc: andrii.nakryiko, kernel-team, Andrii Nakryiko
Amazingly, some libc implementations don't call __NR_nanosleep syscall from
their nanosleep() APIs. Hammer it down with explicit syscall() call and never
get back to it again. Also simplify code for timespec initialization.
I verified that nanosleep is called w/ printk and in exactly same Linux image
that is used in Travis CI. So it should both sleep and call correct syscall.
v1->v2:
- math is too hard, fix usec -> nsec convertion (Martin);
- test_vmlinux has explicit nanosleep() call, convert that one as well.
Fixes: 4e1fd25d19e8 ("selftests/bpf: Fix usleep() implementation")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/testing/selftests/bpf/prog_tests/vmlinux.c | 2 +-
tools/testing/selftests/bpf/test_progs.c | 16 ++++++----------
2 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/vmlinux.c b/tools/testing/selftests/bpf/prog_tests/vmlinux.c
index 04939eda1325..72310cfc6474 100644
--- a/tools/testing/selftests/bpf/prog_tests/vmlinux.c
+++ b/tools/testing/selftests/bpf/prog_tests/vmlinux.c
@@ -11,7 +11,7 @@ static void nsleep()
{
struct timespec ts = { .tv_nsec = MY_TV_NSEC };
- (void)nanosleep(&ts, NULL);
+ (void)syscall(__NR_nanosleep, &ts, NULL);
}
void test_vmlinux(void)
diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index f85a06512541..dc12fd0de1c2 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -35,16 +35,12 @@ struct prog_test_def {
*/
int usleep(useconds_t usec)
{
- struct timespec ts;
-
- if (usec > 999999) {
- ts.tv_sec = usec / 1000000;
- ts.tv_nsec = usec % 1000000;
- } else {
- ts.tv_sec = 0;
- ts.tv_nsec = usec;
- }
- return nanosleep(&ts, NULL);
+ struct timespec ts = {
+ .tv_sec = usec / 1000000,
+ .tv_nsec = (usec % 1000000) * 1000,
+ };
+
+ return syscall(__NR_nanosleep, &ts, NULL);
}
static bool should_run(struct test_selector *sel, int num, const char *name)
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time
2020-03-14 0:27 [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time Andrii Nakryiko
@ 2020-03-14 0:34 ` Martin KaFai Lau
2020-03-17 18:56 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Martin KaFai Lau @ 2020-03-14 0:34 UTC (permalink / raw)
To: Andrii Nakryiko; +Cc: bpf, netdev, ast, daniel, andrii.nakryiko, kernel-team
On Fri, Mar 13, 2020 at 05:27:43PM -0700, Andrii Nakryiko wrote:
> Amazingly, some libc implementations don't call __NR_nanosleep syscall from
> their nanosleep() APIs. Hammer it down with explicit syscall() call and never
> get back to it again. Also simplify code for timespec initialization.
>
> I verified that nanosleep is called w/ printk and in exactly same Linux image
> that is used in Travis CI. So it should both sleep and call correct syscall.
>
> v1->v2:
> - math is too hard, fix usec -> nsec convertion (Martin);
> - test_vmlinux has explicit nanosleep() call, convert that one as well.
Acked-by: Martin KaFai Lau <kafai@fb.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time
2020-03-14 0:27 [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time Andrii Nakryiko
2020-03-14 0:34 ` Martin KaFai Lau
@ 2020-03-17 18:56 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Daniel Borkmann @ 2020-03-17 18:56 UTC (permalink / raw)
To: Andrii Nakryiko, bpf, netdev, ast; +Cc: andrii.nakryiko, kernel-team
On 3/14/20 1:27 AM, Andrii Nakryiko wrote:
> Amazingly, some libc implementations don't call __NR_nanosleep syscall from
> their nanosleep() APIs. Hammer it down with explicit syscall() call and never
> get back to it again. Also simplify code for timespec initialization.
>
> I verified that nanosleep is called w/ printk and in exactly same Linux image
> that is used in Travis CI. So it should both sleep and call correct syscall.
>
> v1->v2:
> - math is too hard, fix usec -> nsec convertion (Martin);
> - test_vmlinux has explicit nanosleep() call, convert that one as well.
>
> Fixes: 4e1fd25d19e8 ("selftests/bpf: Fix usleep() implementation")
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Applied, thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-03-14 0:27 [PATCH v2 bpf-next] selftests/bpf: fix nanosleep for real this time Andrii Nakryiko
2020-03-14 0:34 ` Martin KaFai Lau
2020-03-17 18:56 ` Daniel Borkmann
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