[PATCH net-next v4 06/12] ax88179_178a: Add VLAN offload support for AX88179A

[Birger Koblitz]

The AX88179A-based chips support VLAN offload. Add configuration
support in netdev_ops. Features supported are:
NETIF_F_HW_VLAN_CTAG_TX, NETIF_F_HW_VLAN_CTAG_RX
and NETIF_F_HW_VLAN_CTAG_FILTER.

Signed-off-by: Birger Koblitz <mail@xxxxxxxxxxxxxxxxx>
---
 drivers/net/usb/ax88179_lib.c      |   2 +
 drivers/net/usb/ax88179a_devices.c | 100 +++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+)

diff --git a/drivers/net/usb/ax88179_lib.c b/drivers/net/usb/ax88179_lib.c
index 7b5c17a01df2deac2cc0210bc88193be1abfbe23..26c874b31beafac796264e46ecc942b4bd460ac0 100644
--- a/drivers/net/usb/ax88179_lib.c
+++ b/drivers/net/usb/ax88179_lib.c
@@ -348,6 +348,7 @@ int ax88179_set_features(struct net_device *net, netdev_features_t features)
 {
 	u8 tmp;
 	struct usbnet *dev = netdev_priv(net);
+	struct ax88179_data *data = dev->driver_priv;
 	netdev_features_t changed = net->features ^ features;
 
 	if (changed & NETIF_F_IP_CSUM) {
@@ -367,6 +368,7 @@ int ax88179_set_features(struct net_device *net, netdev_features_t features)
 		tmp ^= AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
 		       AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
 		ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, &tmp);
+		data->rx_checksum = !!(features & NETIF_F_RXCSUM);
 	}
 
 	return 0;
diff --git a/drivers/net/usb/ax88179a_devices.c b/drivers/net/usb/ax88179a_devices.c
index 2bd6e181dfbe319e569fa3d6325fd45ea0b9c732..b6c24a11660fcc17957452a86e66dbda3b71f2ec 100644
--- a/drivers/net/usb/ax88179a_devices.c
+++ b/drivers/net/usb/ax88179a_devices.c
@@ -261,6 +261,62 @@ static const struct ethtool_ops ax88179a_ethtool_ops = {
 	.get_ts_info		= ethtool_op_get_ts_info,
 };
 
+static int ax88179a_vlan_rx_kill_vid(struct net_device *net, __be16 proto, u16 vid)
+{
+	struct usbnet *dev = netdev_priv(net);
+	u8 vlan_ctrl;
+	u16 reg16;
+	u8 reg8;
+
+	ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+	vlan_ctrl = reg8;
+
+	/* Address */
+	reg8 = (vid / 16);
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_ADDRESS, 1, 1, &reg8);
+
+	/* Data */
+	reg8 = vlan_ctrl | AX_VLAN_CONTROL_RD;
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+
+	ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_DATA0, 2, 2, &reg16);
+	reg16 &= ~(1 << (vid % 16));
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_DATA0, 2, 2, &reg16);
+
+	reg8 = vlan_ctrl | AX_VLAN_CONTROL_WE;
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+
+	return 0;
+}
+
+static int ax88179a_vlan_rx_add_vid(struct net_device *net, __be16 proto, u16 vid)
+{
+	struct usbnet *dev = netdev_priv(net);
+	u8 vlan_ctrl;
+	u16 reg16;
+	u8 reg8;
+
+	ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+	vlan_ctrl = reg8;
+
+	/* Address */
+	reg8 = (vid / 16);
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_ADDRESS, 1, 1, &reg8);
+
+	/* Data */
+	reg8 = vlan_ctrl | AX_VLAN_CONTROL_RD;
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+
+	ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_DATA0, 2, 2, &reg16);
+	reg16 |= (1 << (vid % 16));
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_DATA0, 2, 2, &reg16);
+
+	reg8 = vlan_ctrl | AX_VLAN_CONTROL_WE;
+	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &reg8);
+
+	return 0;
+}
+
 static void ax88179a_mdio_unregister(struct ax88179_data *data)
 {
 	mdiobus_unregister(data->mdio);
@@ -516,6 +572,47 @@ static int ax88179a_init_mdio(struct usbnet *dev)
 	return ret;
 }
 
+static int ax88179a_set_features(struct net_device *net, netdev_features_t features)
+{
+	u8 tmp;
+	int ret;
+	struct usbnet *dev = netdev_priv(net);
+	netdev_features_t changed = net->features ^ features;
+
+	ret = ax88179_set_features(net, features);
+	if (ret)
+		return ret;
+
+	if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) {
+		ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &tmp);
+		tmp ^= AX_VLAN_CONTROL_VFE;
+		ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &tmp);
+		if (features & NETIF_F_HW_VLAN_CTAG_FILTER) {
+			for (int i = 0; i < 256; i++) {
+				u16 tmp16 = 0;
+				/* Address */
+				tmp = i;
+				ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_ADDRESS,
+						  1, 1, &tmp);
+				/* Data */
+				ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_DATA0,
+						  2, 2, &tmp16);
+				tmp = AX_VLAN_CONTROL_WE;
+				ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL,
+						  1, 1, &tmp);
+			}
+		}
+	}
+
+	if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
+		ax88179_read_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &tmp);
+		tmp ^= AX_VLAN_CONTROL_VSO;
+		ax88179_write_cmd(dev, AX_ACCESS_MAC, AX88179A_VLAN_ID_CONTROL, 1, 1, &tmp);
+	}
+
+	return 0;
+}
+
 static const struct net_device_ops ax88179a_netdev_ops = {
 	.ndo_open		= usbnet_open,
 	.ndo_stop		= usbnet_stop,
@@ -526,6 +623,9 @@ static const struct net_device_ops ax88179a_netdev_ops = {
 	.ndo_set_mac_address	= ax88179_set_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_eth_ioctl		= usbnet_mii_ioctl,
+	.ndo_set_features	= ax88179a_set_features,
+	.ndo_vlan_rx_add_vid	= ax88179a_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid	= ax88179a_vlan_rx_kill_vid,
 };
 
 static int ax88179a_bind(struct usbnet *dev, struct usb_interface *intf)

-- 
2.47.3