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Date: Fri, 18 Mar 2022 17:15:20 +0100
From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
To: Greg KH <gregkh@...uxfoundation.org>,
Jiri Kosina <jikos@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
Dave Marchevsky <davemarchevsky@...com>,
Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>
Cc: Tero Kristo <tero.kristo@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
netdev@...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 bpf-next v3 09/17] selftests/bpf: 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 v3:
- use the new hid_get_data API
new in v2
---
tools/testing/selftests/bpf/prog_tests/hid.c | 80 ++++++++++++++++++++
tools/testing/selftests/bpf/progs/hid.c | 51 +++++++++++++
2 files changed, 131 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/hid.c b/tools/testing/selftests/bpf/prog_tests/hid.c
index 8c8e17e7385f..b8d4dcf20b05 100644
--- a/tools/testing/selftests/bpf/prog_tests/hid.c
+++ b/tools/testing/selftests/bpf/prog_tests/hid.c
@@ -401,6 +401,83 @@ static int test_hid_raw_event(struct hid *hid_skel, int uhid_fd, int sysfs_fd)
return ret;
}
+/*
+ * 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.
+ */
+static int test_hid_attach_flags(struct hid *hid_skel, int uhid_fd, int sysfs_fd)
+{
+ int err, hidraw_ino, hidraw_fd = -1;
+ char hidraw_path[64] = {0};
+ u8 buf[10] = {0};
+ int ret = -1;
+
+ /* attach hid_test_insert2 program */
+ hid_skel->links.hid_test_insert2 =
+ bpf_program__attach_hid(hid_skel->progs.hid_test_insert2, sysfs_fd, 0);
+ if (!ASSERT_OK_PTR(hid_skel->links.hid_test_insert2,
+ "attach_hid(hid_test_insert2)"))
+ return PTR_ERR(hid_skel->links.hid_test_insert2);
+
+ /* then attach hid_test_insert1 program before the previous*/
+ hid_skel->links.hid_test_insert1 =
+ bpf_program__attach_hid(hid_skel->progs.hid_test_insert1,
+ sysfs_fd,
+ BPF_F_INSERT_HEAD);
+ if (!ASSERT_OK_PTR(hid_skel->links.hid_test_insert1,
+ "attach_hid(hid_test_insert1)"))
+ return PTR_ERR(hid_skel->links.hid_test_insert1);
+
+ /* finally attach hid_test_insert3 at the end */
+ hid_skel->links.hid_test_insert3 =
+ bpf_program__attach_hid(hid_skel->progs.hid_test_insert3, sysfs_fd, 0);
+ if (!ASSERT_OK_PTR(hid_skel->links.hid_test_insert3,
+ "attach_hid(hid_test_insert3)"))
+ return PTR_ERR(hid_skel->links.hid_test_insert3);
+
+ hidraw_ino = get_hidraw(hid_skel->links.hid_test_insert1);
+ if (!ASSERT_GE(hidraw_ino, 0, "get_hidraw"))
+ goto cleanup;
+
+ /* open hidraw node to check the other side of the pipe */
+ sprintf(hidraw_path, "/dev/hidraw%d", hidraw_ino);
+ hidraw_fd = open(hidraw_path, O_RDWR | O_NONBLOCK);
+
+ if (!ASSERT_GE(hidraw_fd, 0, "open_hidraw"))
+ goto cleanup;
+
+ /* inject one event */
+ buf[0] = 1;
+ send_event(uhid_fd, buf, 6);
+
+ /* read the data from hidraw */
+ memset(buf, 0, sizeof(buf));
+ err = read(hidraw_fd, buf, sizeof(buf));
+ if (!ASSERT_EQ(err, 6, "read_hidraw"))
+ goto cleanup;
+
+ if (!ASSERT_EQ(buf[1], 1, "hid_test_insert1"))
+ goto cleanup;
+
+ if (!ASSERT_EQ(buf[2], 2, "hid_test_insert2"))
+ goto cleanup;
+
+ if (!ASSERT_EQ(buf[3], 3, "hid_test_insert3"))
+ goto cleanup;
+
+ ret = 0;
+
+cleanup:
+ if (hidraw_fd >= 0)
+ close(hidraw_fd);
+
+ hid__detach(hid_skel);
+
+ return ret;
+}
+
/*
* Attach hid_rdesc_fixup to the given uhid device,
* retrieve and open the matching hidraw node,
@@ -505,6 +582,9 @@ void serial_test_hid_bpf(void)
err = test_hid_raw_event(hid_skel, uhid_fd, sysfs_fd);
ASSERT_OK(err, "hid");
+ err = test_hid_attach_flags(hid_skel, uhid_fd, sysfs_fd);
+ ASSERT_OK(err, "hid_user_raw_request");
+
/*
* this test should be run last because we disconnect/reconnect
* the device, meaning that it changes the overall uhid device
diff --git a/tools/testing/selftests/bpf/progs/hid.c b/tools/testing/selftests/bpf/progs/hid.c
index c9ce0e36e7b9..390c1bb8d850 100644
--- a/tools/testing/selftests/bpf/progs/hid.c
+++ b/tools/testing/selftests/bpf/progs/hid.c
@@ -77,3 +77,54 @@ int hid_rdesc_fixup(struct hid_bpf_ctx *ctx)
return 0;
}
+
+SEC("hid/device_event")
+int hid_test_insert1(struct hid_bpf_ctx *ctx)
+{
+ __u8 *data = bpf_hid_get_data(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("hid/device_event")
+int hid_test_insert2(struct hid_bpf_ctx *ctx)
+{
+ __u8 *data = bpf_hid_get_data(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("hid/device_event")
+int hid_test_insert3(struct hid_bpf_ctx *ctx)
+{
+ __u8 *data = bpf_hid_get_data(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;
+}
--
2.35.1
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