[PATCH net] selftests: loopback.sh: skip this test if the driver does not support

[Hangbin Liu <liuhangbin@gmail.com>]

The loopback feature is only supported on a few drivers like broadcom,
mellanox, etc. The default veth driver has not supported it yet. To avoid
returning failed and making the runner feel confused, let's just skip
the test on drivers that not support loopback.

Fixes: ad11340994d5 ("selftests: Add loopback test")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 tools/testing/selftests/net/forwarding/loopback.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/loopback.sh b/tools/testing/selftests/net/forwarding/loopback.sh
index 6e4626ae71b0..8f4057310b5b 100755
--- a/tools/testing/selftests/net/forwarding/loopback.sh
+++ b/tools/testing/selftests/net/forwarding/loopback.sh
@@ -1,6 +1,9 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 ALL_TESTS="loopback_test"
 NUM_NETIFS=2
 source tc_common.sh
@@ -72,6 +75,11 @@ setup_prepare()
 
 	h1_create
 	h2_create
+
+	if ethtool -k $h1 | grep loopback | grep -q fixed; then
+		log_test "SKIP: dev $h1 does not support loopback feature"
+		exit $ksft_skip
+	fi
 }
 
 cleanup()
-- 
2.19.2