On 5/22/19 4:20 PM, Roman Gushchin wrote:
> Add a kselftest to cover bpf auto-detachment functionality.
> The test creates a cgroup, associates some resources with it,
> attaches a couple of bpf programs and deletes the cgroup.
>
> Then it checks that bpf programs are going away in 5 seconds.
>
> Expected output:
> $ ./test_cgroup_attach
> #override:PASS
> #multi:PASS
> #autodetach:PASS
> test_cgroup_attach:PASS
>
> On a kernel without auto-detaching:
> $ ./test_cgroup_attach
> #override:PASS
> #multi:PASS
> #autodetach:FAIL
> test_cgroup_attach:FAIL
>
> Signed-off-by: Roman Gushchin <guro@xxxxxx>
> ---
> .../selftests/bpf/test_cgroup_attach.c | 99 ++++++++++++++++++-
> 1 file changed, 98 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/test_cgroup_attach.c b/tools/testing/selftests/bpf/test_cgroup_attach.c
> index 93d4fe295e7d..bc5bd0f1728e 100644
> --- a/tools/testing/selftests/bpf/test_cgroup_attach.c
> +++ b/tools/testing/selftests/bpf/test_cgroup_attach.c
> @@ -456,9 +456,106 @@ static int test_multiprog(void)
> return rc;
> }
>
> +static int test_autodetach(void)
> +{
> + __u32 prog_cnt = 4, attach_flags;
> + int allow_prog[2] = {0};
> + __u32 prog_ids[2] = {0};
> + int cg = 0, i, rc = -1;
> + void *ptr = NULL;
> + int attempts;
> +
> +
Also extra line here.
> + for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
> + allow_prog[i] = prog_load_cnt(1, 1 << i);
> + if (!allow_prog[i])
> + goto err;
> + }
> +
> + if (setup_cgroup_environment())
> + goto err;
> +
> + /* create a cgroup, attach two programs and remember their ids */
> + cg = create_and_get_cgroup("/cg_autodetach");
[...]
> +
> int main(int argc, char **argv)
> {
> - int (*tests[])(void) = {test_foo_bar, test_multiprog};
> + int (*tests[])(void) = {
> + test_foo_bar,
> + test_multiprog,
> + test_autodetach,
> + };
> int errors = 0;
> int i;
>
>
