selftests/bpf: fail test_tunnel.sh if subtests fail

Right now test_tunnel.sh always exits with success even if some
of the subtests fail. Since the output is very verbose, it's
hard to spot the issues with subtests. Let's fail the script
if any subtest fails.
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/testing/selftests/bpf/test_tunnel.sh

@@ -696,30 +696,57 @@ check_err()
 
 bpf_tunnel_test()
 {
+	local errors=0
+
 	echo "Testing GRE tunnel..."
 	test_gre
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6GRE tunnel..."
 	test_ip6gre
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6GRETAP tunnel..."
 	test_ip6gretap
+	errors=$(( $errors + $? ))
+
 	echo "Testing ERSPAN tunnel..."
 	test_erspan v2
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6ERSPAN tunnel..."
 	test_ip6erspan v2
+	errors=$(( $errors + $? ))
+
 	echo "Testing VXLAN tunnel..."
 	test_vxlan
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6VXLAN tunnel..."
 	test_ip6vxlan
+	errors=$(( $errors + $? ))
+
 	echo "Testing GENEVE tunnel..."
 	test_geneve
+	errors=$(( $errors + $? ))
+
 	echo "Testing IP6GENEVE tunnel..."
 	test_ip6geneve
+	errors=$(( $errors + $? ))
+
 	echo "Testing IPIP tunnel..."
 	test_ipip
+	errors=$(( $errors + $? ))
+
 	echo "Testing IPIP6 tunnel..."
 	test_ipip6
+	errors=$(( $errors + $? ))
+
 	echo "Testing IPSec tunnel..."
 	test_xfrm_tunnel
+	errors=$(( $errors + $? ))
+
+	return $errors
 }
 
 trap cleanup 0 3 6
@@ -728,4 +755,9 @@ trap cleanup_exit 2 9
 cleanup
 bpf_tunnel_test
 
+if [ $? -ne 0 ]; then
+	echo -e "$(basename $0): ${RED}FAIL${NC}"
+	exit 1
+fi
+echo -e "$(basename $0): ${GREEN}PASS${NC}"
 exit 0