openwrt-xburst/target/linux/ixp4xx/patches-2.6.30/304-ixp4xx_eth_jumboframe.patch

--- a/drivers/net/arm/ixp4xx_eth.c
+++ b/drivers/net/arm/ixp4xx_eth.c
@@ -52,7 +52,7 @@
 
 #define POOL_ALLOC_SIZE		(sizeof(struct desc) * (RX_DESCS + TX_DESCS))
 #define REGS_SIZE		0x1000
-#define MAX_MRU			1536 /* 0x600 */
+#define MAX_MRU			(16320 - ETH_HLEN - ETH_FCS_LEN)
 #define RX_BUFF_SIZE		ALIGN((NET_IP_ALIGN) + MAX_MRU, 4)
 
 #define NAPI_WEIGHT		16
@@ -1066,6 +1066,32 @@ static void destroy_queues(struct port *
 	}
 }
 
+static int eth_do_change_mtu(struct net_device *dev, int mtu)
+{
+	struct port *port;
+	struct msg msg;
+	/* adjust for ethernet headers */
+	int framesize = mtu + ETH_HLEN + ETH_FCS_LEN;
+
+	port = netdev_priv(dev);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = NPE_SETMAXFRAMELENGTHS;
+	msg.eth_id = port->id;
+
+	/* max rx/tx 64 byte blocks */
+	msg.byte2 = ((framesize + 63) / 64) << 8;
+	msg.byte3 = ((framesize + 63) / 64) << 8;
+
+	msg.byte4 = msg.byte6 = framesize >> 8;
+	msg.byte5 = msg.byte7 = framesize & 0xff;
+
+	if (npe_send_recv_message(port->npe, &msg, "ETH_SET_MAX_FRAME_LENGTH"))
+		return -EIO;
+
+	return 0;
+}
+
 static int eth_open(struct net_device *dev)
 {
 	struct port *port = netdev_priv(dev);
@@ -1117,6 +1143,8 @@ static int eth_open(struct net_device *d
 	if (npe_send_recv_message(port->npe, &msg, "ETH_SET_FIREWALL_MODE"))
 		return -EIO;
 
+	eth_do_change_mtu(dev, dev->mtu);
+
 	if ((err = request_queues(port)) != 0)
 		return err;
 
@@ -1256,7 +1284,26 @@ static int eth_close(struct net_device *
 	return 0;
 }
 
+static int ixp_eth_change_mtu(struct net_device *dev, int mtu)
+{
+	int ret;
+
+	if (mtu > MAX_MRU)
+		return -EINVAL;
+
+	if (dev->flags & IFF_UP) {
+		ret = eth_do_change_mtu(dev, mtu);
+		if (ret < 0)
+			return ret;
+	}
+
+	dev->mtu = mtu;
+
+	return 0;
+}
+
 static const struct net_device_ops ixp4xx_netdev_ops = {
+	.ndo_change_mtu = ixp_eth_change_mtu,
 	.ndo_open = eth_open,
 	.ndo_stop = eth_close,
 	.ndo_start_xmit = eth_xmit,