netdev - [RFC hid v1 09/10] selftests: hid: ensure the program is correctly pinned

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Date:   Thu, 24 Nov 2022 16:16:02 +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>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
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,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [RFC hid v1 09/10] selftests: hid: ensure the program is correctly pinned

Turns out that if bpffs was not mounted, the test was silently passing.

So ensure it passes, but also force the mount of the bpffs in vmtest.sh
so we get passing results.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
 tools/testing/selftests/hid/hid_bpf.c | 3 ++-
 tools/testing/selftests/hid/vmtest.sh | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 4bdd1cfa7d13..3ae544bf24fe 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -712,7 +712,8 @@ TEST_F(hid_bpf, test_attach_detach)
 
 	/* pin the 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);
+	err = bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
+	ASSERT_OK(err) TH_LOG("error while calling bpf_program__pin");
 	remove(PIN_PATH);
 #undef PIN_PATH
 	usleep(100000);
diff --git a/tools/testing/selftests/hid/vmtest.sh b/tools/testing/selftests/hid/vmtest.sh
index f124cf6b0d0f..bd60f65acb72 100755
--- a/tools/testing/selftests/hid/vmtest.sh
+++ b/tools/testing/selftests/hid/vmtest.sh
@@ -108,8 +108,10 @@ EOF
 	if [[ "${debug_shell}" != "yes" ]]
 	then
 		touch ${OUTPUT_DIR}/${LOG_FILE}
-		command="set -o pipefail ; ${command} 2>&1 | tee ${OUTPUT_DIR}/${LOG_FILE}"
+		command="mount bpffs -t bpf /sys/fs/bpf/; set -o pipefail ; ${command} 2>&1 | tee ${OUTPUT_DIR}/${LOG_FILE}"
 		post_command="cat ${OUTPUT_DIR}/${LOG_FILE}"
+	else
+		command="mount bpffs -t bpf /sys/fs/bpf/; ${command}"
 	fi
 
 	set +e
-- 
2.38.1