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--- 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 (14320 - ETH_HLEN - ETH_FCS_LEN)
#define RX_BUFF_SIZE ALIGN((NET_IP_ALIGN) + MAX_MRU, 4)
#define NAPI_WEIGHT 16
@@ -1061,6 +1061,32 @@ 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);
@@ -1112,6 +1138,8 @@ 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;
@@ -1251,7 +1279,26 @@ 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,
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