selftests: net: Add on/off checks for non-fixed features of interface

Implement on/off testing for all non-fixed features via while loop.
Signed-off-by: Abhinav Jain <jain.abhinav177@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240821171903.118324-3-jain.abhinav177@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/netdevice.sh

@@ -124,7 +124,40 @@ 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"
+		[ "$FIXED" != "[fixed]" ] || continue # Skip fixed features
+		feature="${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
+
+		#restore the feature to its initial state
+		ethtool --offload "$netdev" "$feature" "$VALUE"
+		if [ $? -eq 0 ]; then
+			echo "PASS: $netdev: Restore feature $feature" \
+				"to initial state $VALUE"
+		else
+			echo "FAIL: $netdev: Failed to restore feature" \
+				"$feature to initial state $VALUE"
+		fi
+
+	done < "$TMP_ETHTOOL_FEATURES"
+
 	rm "$TMP_ETHTOOL_FEATURES"
 
 	kci_netdev_ethtool_test 74 'dump' "ethtool -d $netdev"