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Subject[PATCH HID for-next v2 5/9] selftests: hid: prepare tests for HID_BPF API change
Date
We plan on changing the return value of hid_bpf_attach_prog().
Instead of returning an error code, it will return an fd to a bpf_link.
This bpf_link is responsible for the binding between the bpf program and
the hid device.

Add a fallback mechanism to not break bisections by pinning the program
when we run this test against the non changed kernel.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

no changes in v2
---
tools/testing/selftests/hid/hid_bpf.c | 29 +++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 3b204a15e44b..9a262fe99b32 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -444,13 +444,21 @@ FIXTURE(hid_bpf) {
int hid_id;
pthread_t tid;
struct hid *skel;
+ int hid_links[3]; /* max number of programs loaded in a single test */
};
static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
{
+ int i;
+
if (self->hidraw_fd)
close(self->hidraw_fd);
self->hidraw_fd = 0;

+ for (i = 0; i < ARRAY_SIZE(self->hid_links); i++) {
+ if (self->hid_links[i])
+ close(self->hid_links[i]);
+ }
+
hid__destroy(self->skel);
self->skel = NULL;
}
@@ -512,6 +520,9 @@ static void load_programs(const struct test_program programs[],
.ctx_size_in = sizeof(args),
);

+ ASSERT_LE(progs_count, ARRAY_SIZE(self->hid_links))
+ TH_LOG("too many programs are to be loaded");
+
/* open the bpf file */
self->skel = hid__open();
ASSERT_OK_PTR(self->skel) TEARDOWN_LOG("Error while calling hid__open");
@@ -543,7 +554,10 @@ static void load_programs(const struct test_program programs[],
args.hid = self->hid_id;
args.insert_head = programs[i].insert_head;
err = bpf_prog_test_run_opts(attach_fd, &tattr);
- ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+ ASSERT_GE(args.retval, 0)
+ TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+
+ self->hid_links[i] = args.retval;
}

self->hidraw_fd = open_hidraw(self->dev_id);
@@ -619,10 +633,17 @@ TEST_F(hid_bpf, test_attach_detach)
{ .name = "hid_second_event" },
};
__u8 buf[10] = {0};
- int err;
+ int err, link;

LOAD_PROGRAMS(progs);

+ link = self->hid_links[0];
+ /* we might not be using the new code path where hid_bpf_attach_prog()
+ * returns a link.
+ */
+ if (!link)
+ link = bpf_program__fd(self->skel->progs.hid_first_event);
+
/* inject one event */
buf[0] = 1;
buf[1] = 42;
@@ -640,8 +661,8 @@ TEST_F(hid_bpf, test_attach_detach)

/* pin the first program and immediately unpin it */
#define PIN_PATH "/sys/fs/bpf/hid_first_event"
- err = bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
- ASSERT_OK(err) TH_LOG("error while calling bpf_program__pin");
+ err = bpf_obj_pin(link, PIN_PATH);
+ ASSERT_OK(err) TH_LOG("error while calling bpf_obj_pin");
remove(PIN_PATH);
#undef PIN_PATH
usleep(100000);
--
2.38.1
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