smsc75xx: fix jumbo frame support

[ Upstream commit 4c51e53689569398d656e631c17308d9b8e84650 ]

This patch enables RX of jumbo frames for LAN7500.

Previously the driver would transmit jumbo frames succesfully but
would drop received jumbo frames (incrementing the interface errors
count).

With this patch applied the device can succesfully receive jumbo
frames up to MTU 9000 (9014 bytes on the wire including ethernet
header).

Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 251a3354a4b049b2299233aa90606f400e5ccf2b..937c09dd8e162a16ea4a36526b18a1250c6fe6b2 100644 (file)
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -914,8 +914,12 @@ static int smsc75xx_set_rx_max_frame_length(struct usbnet *dev, int size)
 static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
 {
        struct usbnet *dev = netdev_priv(netdev);
+       int ret;
+
+       if (new_mtu > MAX_SINGLE_PACKET_SIZE)
+               return -EINVAL;
 
-       int ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu);
+       ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to set mac rx frame length\n");
                return ret;
@@ -1324,7 +1328,7 @@ static int smsc75xx_reset(struct usbnet *dev)
 
        netif_dbg(dev, ifup, dev->net, "FCT_TX_CTL set to 0x%08x\n", buf);
 
-       ret = smsc75xx_set_rx_max_frame_length(dev, 1514);
+       ret = smsc75xx_set_rx_max_frame_length(dev, dev->net->mtu + ETH_HLEN);
        if (ret < 0) {
                netdev_warn(dev->net, "Failed to set max rx frame length\n");
                return ret;
@@ -2136,8 +2140,8 @@ static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
                        else if (rx_cmd_a & (RX_CMD_A_LONG | RX_CMD_A_RUNT))
                                dev->net->stats.rx_frame_errors++;
                } else {
-                       /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
-                       if (unlikely(size > (ETH_FRAME_LEN + 12))) {
+                       /* MAX_SINGLE_PACKET_SIZE + 4(CRC) + 2(COE) + 4(Vlan) */
+                       if (unlikely(size > (MAX_SINGLE_PACKET_SIZE + ETH_HLEN + 12))) {
                                netif_dbg(dev, rx_err, dev->net,
                                          "size err rx_cmd_a=0x%08x\n",
                                          rx_cmd_a);