Add a second BPF program to attach to the device, as the development of this feature showed that we also need to ensure we can detach multiple programs to a device (hid_bpf_link->index was actually not set initially, and this lead to any BPF program not being released except for the first one).
Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com --- tools/testing/selftests/hid/hid_bpf.c | 8 +++++++- tools/testing/selftests/hid/progs/hid.c | 13 +++++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c index 6615c26fb5dd..d215bb492eb4 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -616,6 +616,7 @@ TEST_F(hid_bpf, test_attach_detach) { const struct test_program progs[] = { { .name = "hid_first_event" }, + { .name = "hid_second_event" }, }; __u8 buf[10] = {0}; int err; @@ -634,7 +635,10 @@ TEST_F(hid_bpf, test_attach_detach) ASSERT_EQ(buf[0], 1); ASSERT_EQ(buf[2], 47);
- /* pin the program and immediately unpin it */ + /* make sure both programs are run */ + ASSERT_EQ(buf[3], 52); + + /* pin the first program and immediately unpin it */ #define PIN_PATH "/sys/fs/bpf/hid_first_event" bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH); remove(PIN_PATH); @@ -660,6 +664,7 @@ TEST_F(hid_bpf, test_attach_detach) ASSERT_EQ(buf[0], 1); ASSERT_EQ(buf[1], 47); ASSERT_EQ(buf[2], 0); + ASSERT_EQ(buf[3], 0);
/* re-attach our program */
@@ -677,6 +682,7 @@ TEST_F(hid_bpf, test_attach_detach) ASSERT_EQ(err, 6) TH_LOG("read_hidraw"); ASSERT_EQ(buf[0], 1); ASSERT_EQ(buf[2], 47); + ASSERT_EQ(buf[3], 52); }
/* diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c index 6a86af0aa545..88c593f753b5 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -32,6 +32,19 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx) return hid_ctx->size; }
+SEC("?fmod_ret/hid_bpf_device_event") +int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx) +{ + __u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */); + + if (!rw_data) + return 0; /* EPERM check */ + + rw_data[3] = rw_data[2] + 5; + + return hid_ctx->size; +} + SEC("?fmod_ret/hid_bpf_device_event") int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx) {