--- ./drivers/net/8139too.c.orig	Thu Apr 29 13:45:19 2004
+++ ./drivers/net/8139too.c	Thu Apr 29 13:58:32 2004
@@ -188,7 +188,10 @@
 #define NUM_TX_DESC	4
 
 /* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/
-#define MAX_ETH_FRAME_SIZE	1536
+#define MAX_ETH_FRAME_SIZE	2048
+
+#define	MIN_MTU			60
+#define	MAX_MTU			(MAX_ETH_FRAME_SIZE - 14)
 
 /* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */
 #define TX_BUF_SIZE	MAX_ETH_FRAME_SIZE
@@ -629,6 +632,7 @@
 static void rtl8139_hw_start (struct net_device *dev);
 static struct ethtool_ops rtl8139_ethtool_ops;
 static void rtl8139_poll_nc (struct net_device *dev);
+static int rtl8139_change_mtu (struct net_device *dev, int new_mtu);
 
 #ifdef USE_IO_OPS
 
@@ -990,6 +994,7 @@
 	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;
 
 	dev->irq = pdev->irq;
+	dev->change_mtu = rtl8139_change_mtu;
 
 	/* dev->priv/tp zeroed and aligned in alloc_etherdev */
 	tp = dev->priv;
@@ -2542,6 +2547,14 @@
 }
 
 #endif /* CONFIG_PM */
+
+static int rtl8139_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
 
 
 static struct pci_driver rtl8139_pci_driver = {