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Date: Thu, 3 Nov 2022 16:57:53 +0100
From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
To: Greg KH <gregkh@...uxfoundation.org>,
Jiri Kosina <jikos@...nel.org>,
Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc: Tero Kristo <tero.kristo@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-doc@...r.kernel.org,
Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH hid v12 12/15] selftests/hid: Add a test for BPF_F_INSERT_HEAD
Insert 3 programs to check that we are doing the correct thing:
'2', '1', '3' are inserted, but '1' is supposed to be executed first.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
changes in v12:
- use __u8 instead of u8 in hid_bpf.c
- do not rely on uapi for HIF_BPF_FLAGS_*
changes in v11:
- use the new facility from selftests/hid
no changes in v10
no changes in v9
no changes in v8
no changes in v7
changes in v6:
- fixed copy/paste in ASSERT_OK and test execution order
changes in v5:
- use the new API
not in v4
changes in v3:
- use the new hid_get_data API
new in v2
fix test attach_flags
---
tools/testing/selftests/hid/hid_bpf.c | 43 +++++++++++++++++++
tools/testing/selftests/hid/progs/hid.c | 55 ++++++++++++++++++++++++-
2 files changed, 97 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index eb329b5d299f..6615c26fb5dd 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -88,6 +88,7 @@ struct attach_prog_args {
int prog_fd;
unsigned int hid;
int retval;
+ int insert_head;
};
struct hid_hw_request_syscall_args {
@@ -490,6 +491,7 @@ FIXTURE_SETUP(hid_bpf)
struct test_program {
const char *name;
+ int insert_head;
};
#define LOAD_PROGRAMS(progs) \
load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
@@ -539,6 +541,7 @@ static void load_programs(const struct test_program programs[],
args.prog_fd = bpf_program__fd(prog);
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);
}
@@ -740,6 +743,46 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call)
ASSERT_EQ(args.data[1], 2);
}
+/*
+ * Attach hid_insert{0,1,2} to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * inject one event in the uhid device,
+ * check that the programs have been inserted in the correct order.
+ */
+TEST_F(hid_bpf, test_hid_attach_flags)
+{
+ const struct test_program progs[] = {
+ {
+ .name = "hid_test_insert2",
+ .insert_head = 0,
+ },
+ {
+ .name = "hid_test_insert1",
+ .insert_head = 1,
+ },
+ {
+ .name = "hid_test_insert3",
+ .insert_head = 0,
+ },
+ };
+ __u8 buf[10] = {0};
+ int err;
+
+ LOAD_PROGRAMS(progs);
+
+ /* inject one event */
+ buf[0] = 1;
+ uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+ /* read the data from hidraw */
+ memset(buf, 0, sizeof(buf));
+ err = read(self->hidraw_fd, buf, sizeof(buf));
+ ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+ ASSERT_EQ(buf[1], 1);
+ ASSERT_EQ(buf[2], 2);
+ ASSERT_EQ(buf[3], 3);
+}
+
/*
* Attach hid_rdesc_fixup to the given uhid device,
* retrieve and open the matching hidraw node,
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index 5758366a90e6..6a86af0aa545 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -11,6 +11,7 @@ struct attach_prog_args {
int prog_fd;
unsigned int hid;
int retval;
+ int insert_head;
};
__u64 callback_check = 52;
@@ -49,7 +50,8 @@ int attach_prog(struct attach_prog_args *ctx)
{
ctx->retval = hid_bpf_attach_prog(ctx->hid,
ctx->prog_fd,
- 0);
+ ctx->insert_head ? HID_BPF_FLAG_INSERT_HEAD :
+ HID_BPF_FLAG_NONE);
return 0;
}
@@ -141,3 +143,54 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
return sizeof(rdesc) + 73;
}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx)
+{
+ __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+ if (!data)
+ return 0; /* EPERM check */
+
+ /* we need to be run first */
+ if (data[2] || data[3])
+ return -1;
+
+ data[1] = 1;
+
+ return 0;
+}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx)
+{
+ __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+ if (!data)
+ return 0; /* EPERM check */
+
+ /* after insert0 and before insert2 */
+ if (!data[1] || data[3])
+ return -1;
+
+ data[2] = 2;
+
+ return 0;
+}
+
+SEC("?fmod_ret/hid_bpf_device_event")
+int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx)
+{
+ __u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
+
+ if (!data)
+ return 0; /* EPERM check */
+
+ /* at the end */
+ if (!data[1] || !data[2])
+ return -1;
+
+ data[3] = 3;
+
+ return 0;
+}
--
2.36.1
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