Some kselftests rely on teamd to create LAG devices. If the kernel is
built without CONFIG_NET_TEAM, the teamd command fails with:
Failed: Operation not supported

Currently, the exit code of teamd is not properly checked, causing
the test to proceed and eventually fail instead of being skipped.

Add a check for the teamd exit code, mark the test as skipped
to avoid self-positive failures.

Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index a9034f0bb58b..0a474b02371d 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -771,9 +771,21 @@ team_create()
 {
 	local if_name=$1; shift
 	local mode=$1; shift
+	local output
+	local status
 
 	require_command $TEAMD
-	$TEAMD -t $if_name -d -c '{"runner": {"name": "'$mode'"}}'
+	output=$($TEAMD -t $if_name -d -c '{"runner": {"name": "'$mode'"}}' 2>&1)
+	status=$?
+
+	if [ $status -ne 0 ]; then
+		if echo "$output" | grep -q "Operation not supported"; then
+			exit $ksft_skip
+		else
+			exit 1
+		fi
+	fi
+
 	for slave in "$@"; do
 		ip link set dev $slave down
 		ip link set dev $slave master $if_name
-- 
2.43.0