[PATCH v2] sefltests: net: Add on/off checks for network interface non fixed features

[Abhinav Jain <jain.abhinav177@gmail.com>]

This patch addresses the TODO (add non fixed feature on/off check).
I have tested it manually on my system and made changes as suggested in v1

Signed-off-by: Abhinav Jain <jain.abhinav177@gmail.com>
---

PATCH v1:
https://lore.kernel.org/all/20240606212714.27472-1-jain.abhinav177@gmail.com/

Changes since v1:
 - Removed the addition of tail command as it was not required after
   below change
 - Used read to parse the temp features file rather than using for loop
   and took out awk/grep/sed from v1
---
 tools/testing/selftests/net/netdevice.sh | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/netdevice.sh b/tools/testing/selftests/net/netdevice.sh
index e3afcb424710..196b7f985db4 100755
--- a/tools/testing/selftests/net/netdevice.sh
+++ b/tools/testing/selftests/net/netdevice.sh
@@ -124,7 +124,27 @@ kci_netdev_ethtool()
 		return 1
 	fi
 	echo "PASS: $netdev: ethtool list features"
-	#TODO for each non fixed features, try to turn them on/off
+
+	while read -r FEATURE VALUE FIXED; do
+		[ "$FEATURE" != "Features" ] || continue # Skip "Features" line
+		[ "$FIXED" != "[fixed]" ] || continue # Skip fixed features
+		feature = "${FEATURE%:*}"
+
+		ethtool --offload "$netdev" "$feature" off
+		if [ $? -eq 0 ]; then
+			echo "PASS: $netdev: Turned off feature: $feature"
+		else
+			echo "FAIL: $netdev: Failed to turn off feature: $feature"
+		fi
+
+		ethtool --offload "$netdev" "$feature" on
+		if [ $? -eq 0 ]; then
+			echo "PASS: $netdev: Turned on feature: $feature"
+		else
+			echo "FAIL: $netdev: Failed to turn on feature: $feature"
+		fi
+	done < "$TMP_ETHTOOL_FEATURES"
+
 	rm "$TMP_ETHTOOL_FEATURES"
 
 	kci_netdev_ethtool_test 74 'dump' "ethtool -d $netdev"
-- 
2.34.1