net: usb: asix: ax88772: add generic selftest support

With working phylib support we are able now to use generic selftests.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/Kconfig

@@ -165,6 +165,7 @@ config USB_NET_AX8817X
 	select CRC32
 	select PHYLIB
 	select AX88796B_PHY
+	imply NET_SELFTESTS
 	default y
 	help
 	  This option adds support for ASIX AX88xxx based USB 2.0

drivers/net/usb/asix.h

@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/if_vlan.h>
 #include <linux/phy.h>
+#include <net/selftests.h>
 
 #define DRIVER_VERSION "22-Dec-2011"
 #define DRIVER_NAME "asix"

drivers/net/usb/asix_devices.c

@@ -283,6 +283,26 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
 	return ret;
 }
 
+static void ax88772_ethtool_get_strings(struct net_device *netdev, u32 sset,
+					u8 *data)
+{
+	switch (sset) {
+	case ETH_SS_TEST:
+		net_selftest_get_strings(data);
+		break;
+	}
+}
+
+static int ax88772_ethtool_get_sset_count(struct net_device *ndev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_TEST:
+		return net_selftest_get_count();
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static const struct ethtool_ops ax88772_ethtool_ops = {
 	.get_drvinfo		= asix_get_drvinfo,
 	.get_link		= usbnet_get_link,
@@ -296,6 +316,9 @@ static const struct ethtool_ops ax88772_ethtool_ops = {
 	.nway_reset		= phy_ethtool_nway_reset,
 	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
 	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+	.self_test		= net_selftest,
+	.get_strings		= ax88772_ethtool_get_strings,
+	.get_sset_count		= ax88772_ethtool_get_sset_count,
 };
 
 static int ax88772_reset(struct usbnet *dev)