ixp4xx: add support for jumbo frames to the ethernet driver

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17083 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 84 insertions, 0 deletions

diff --git a/target/linux/ixp4xx/patches-2.6.28/304-ixp4xx_eth_jumboframe.patch b/target/linux/ixp4xx/patches-2.6.28/304-ixp4xx_eth_jumboframe.patch
new file mode 100644
index 000000000..ba2ac840a
--- /dev/null
+++ b/target/linux/ixp4xx/patches-2.6.28/304-ixp4xx_eth_jumboframe.patch
@@ -0,0 +1,84 @@
+--- a/drivers/net/arm/ixp4xx_eth.c
++++ b/drivers/net/arm/ixp4xx_eth.c
+@@ -54,7 +54,7 @@
+ 
+ #define POOL_ALLOC_SIZE		(sizeof(struct desc) * (RX_DESCS + TX_DESCS))
+ #define REGS_SIZE		0x1000
+-#define MAX_MRU			1536 /* 0x600 */
++#define MAX_MRU			16384
+ #define RX_BUFF_SIZE		ALIGN((NET_IP_ALIGN) + MAX_MRU, 4)
+ 
+ #define NAPI_WEIGHT		16
+@@ -1011,6 +1011,30 @@ static void destroy_queues(struct port *
+ 	}
+ }
+ 
++static int eth_do_change_mtu(struct net_device *dev, int mtu)
++{
++	struct port *port;
++	struct msg msg;
++
++	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 = ((mtu + 63) / 64) << 8;
++	msg.byte3 = ((mtu + 63) / 64) << 8;
++
++	msg.byte4 = msg.byte6 = mtu >> 8;
++	msg.byte5 = msg.byte7 = mtu & 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);
+@@ -1061,6 +1085,8 @@ 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;
+ 
+@@ -1238,6 +1264,24 @@ static void eth_init_mii(struct net_devi
+ 
+ }
+ 
++static int 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 int __devinit eth_init_one(struct platform_device *pdev)
+ {
+ 	struct port *port;
+@@ -1272,6 +1316,7 @@ static int __devinit eth_init_one(struct
+ 		goto err_free;
+ 	}
+ 
++	dev->change_mtu = eth_change_mtu;
+ 	dev->open = eth_open;
+ 	dev->hard_start_xmit = eth_xmit;
+ 	dev->stop = eth_close;