net: wangxun: Implement the ndo change mtu interface

Add ngbe and txgbe ndo_change_mtu support.
Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wangxun/libwx/wx_hw.c

@@ -4,6 +4,7 @@
 #include <linux/etherdevice.h>
 #include <linux/netdevice.h>
 #include <linux/if_ether.h>
+#include <linux/if_vlan.h>
 #include <linux/iopoll.h>
 #include <linux/pci.h>
 
@@ -1261,7 +1262,7 @@ static void wx_set_rx_buffer_len(struct wx *wx)
 	struct net_device *netdev = wx->netdev;
 	u32 mhadd, max_frame;
 
-	max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
+	max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 	/* adjust max frame to be at least the size of a standard frame */
 	if (max_frame < (ETH_FRAME_LEN + ETH_FCS_LEN))
 		max_frame = (ETH_FRAME_LEN + ETH_FCS_LEN);
@@ -1271,6 +1272,24 @@ static void wx_set_rx_buffer_len(struct wx *wx)
 		wr32(wx, WX_PSR_MAX_SZ, max_frame);
 }
 
+/**
+ * wx_change_mtu - Change the Maximum Transfer Unit
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum frame size
+ *
+ * Returns 0 on success, negative on failure
+ **/
+int wx_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	struct wx *wx = netdev_priv(netdev);
+
+	netdev->mtu = new_mtu;
+	wx_set_rx_buffer_len(wx);
+
+	return 0;
+}
+EXPORT_SYMBOL(wx_change_mtu);
+
 /* Disable the specified rx queue */
 void wx_disable_rx_queue(struct wx *wx, struct wx_ring *ring)
 {

drivers/net/ethernet/wangxun/libwx/wx_hw.h

@@ -23,6 +23,7 @@ void wx_flush_sw_mac_table(struct wx *wx);
 int wx_set_mac(struct net_device *netdev, void *p);
 void wx_disable_rx(struct wx *wx);
 void wx_set_rx_mode(struct net_device *netdev);
+int wx_change_mtu(struct net_device *netdev, int new_mtu);
 void wx_disable_rx_queue(struct wx *wx, struct wx_ring *ring);
 void wx_configure(struct wx *wx);
 int wx_disable_pcie_master(struct wx *wx);

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -300,6 +300,8 @@
 #define WX_MAX_RXD                   8192
 #define WX_MAX_TXD                   8192
 
+#define WX_MAX_JUMBO_FRAME_SIZE      9432 /* max payload 9414 */
+
 /* Supported Rx Buffer Sizes */
 #define WX_RXBUFFER_256      256    /* Used for skb receive header */
 #define WX_RXBUFFER_2K       2048

drivers/net/ethernet/wangxun/ngbe/ngbe_main.c

@@ -9,6 +9,7 @@
 #include <linux/etherdevice.h>
 #include <net/ip.h>
 #include <linux/phy.h>
+#include <linux/if_vlan.h>
 
 #include "../libwx/wx_type.h"
 #include "../libwx/wx_hw.h"
@@ -469,6 +470,7 @@ static void ngbe_shutdown(struct pci_dev *pdev)
 static const struct net_device_ops ngbe_netdev_ops = {
 	.ndo_open               = ngbe_open,
 	.ndo_stop               = ngbe_close,
+	.ndo_change_mtu         = wx_change_mtu,
 	.ndo_start_xmit         = wx_xmit_frame,
 	.ndo_set_rx_mode        = wx_set_rx_mode,
 	.ndo_validate_addr      = eth_validate_addr,
@@ -560,7 +562,8 @@ static int ngbe_probe(struct pci_dev *pdev,
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
 
 	netdev->min_mtu = ETH_MIN_MTU;
-	netdev->max_mtu = NGBE_MAX_JUMBO_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
+	netdev->max_mtu = WX_MAX_JUMBO_FRAME_SIZE -
+			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 
 	wx->bd_number = func_nums;
 	/* setup the private structure */

drivers/net/ethernet/wangxun/ngbe/ngbe_type.h

@@ -137,7 +137,6 @@ enum NGBE_MSCA_CMD_value {
 #define NGBE_RX_PB_SIZE				42
 #define NGBE_MC_TBL_SIZE			128
 #define NGBE_TDB_PB_SZ				(20 * 1024) /* 160KB Packet Buffer */
-#define NGBE_MAX_JUMBO_FRAME_SIZE		9432 /* max payload 9414 */
 
 /* TX/RX descriptor defines */
 #define NGBE_DEFAULT_TXD			512 /* default ring size */

drivers/net/ethernet/wangxun/txgbe/txgbe_main.c

@@ -8,6 +8,7 @@
 #include <linux/string.h>
 #include <linux/etherdevice.h>
 #include <net/ip.h>
+#include <linux/if_vlan.h>
 
 #include "../libwx/wx_type.h"
 #include "../libwx/wx_lib.h"
@@ -486,6 +487,7 @@ static void txgbe_shutdown(struct pci_dev *pdev)
 static const struct net_device_ops txgbe_netdev_ops = {
 	.ndo_open               = txgbe_open,
 	.ndo_stop               = txgbe_close,
+	.ndo_change_mtu         = wx_change_mtu,
 	.ndo_start_xmit         = wx_xmit_frame,
 	.ndo_set_rx_mode        = wx_set_rx_mode,
 	.ndo_validate_addr      = eth_validate_addr,
@@ -603,7 +605,8 @@ static int txgbe_probe(struct pci_dev *pdev,
 	netdev->priv_flags |= IFF_SUPP_NOFCS;
 
 	netdev->min_mtu = ETH_MIN_MTU;
-	netdev->max_mtu = TXGBE_MAX_JUMBO_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
+	netdev->max_mtu = WX_MAX_JUMBO_FRAME_SIZE -
+			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 
 	/* make sure the EEPROM is good */
 	err = txgbe_validate_eeprom_checksum(wx, NULL);

drivers/net/ethernet/wangxun/txgbe/txgbe_type.h

@@ -79,7 +79,6 @@
 #define TXGBE_SP_MC_TBL_SIZE    128
 #define TXGBE_SP_RX_PB_SIZE     512
 #define TXGBE_SP_TDB_PB_SZ      (160 * 1024) /* 160KB Packet Buffer */
-#define TXGBE_MAX_JUMBO_FRAME_SIZE      9432 /* max payload 9414 */
 
 /* TX/RX descriptor defines */
 #define TXGBE_DEFAULT_TXD               512