smsc95xx: Support only IPv4 TCP/UDP csum offload

When TX checksum offload is used, if the computed checksum is 0 the
LAN95xx device do not alter the checksum to 0xffff.  In the case of ipv4
UDP checksum, it indicates to receiver that no checksum is calculated.
Under ipv6, UDP checksum yields a result of zero must be changed to
0xffff. Hence disabling checksum offload for ipv6 packets.

Signed-off-by: Nisar Sayed <Nisar.Sayed@microchip.com>
Reported-by: popcorn mix <popcornmix@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 765400b62168436b278d8a09fa0dd1fd8566bcb7..2dfca96a63b60283b89efab676932a711024a499 100644 (file)
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -681,7 +681,7 @@ static int smsc95xx_set_features(struct net_device *netdev,
        if (ret < 0)
                return ret;
 
-       if (features & NETIF_F_HW_CSUM)
+       if (features & NETIF_F_IP_CSUM)
                read_buf |= Tx_COE_EN_;
        else
                read_buf &= ~Tx_COE_EN_;
@@ -1279,12 +1279,19 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
 
        spin_lock_init(&pdata->mac_cr_lock);
 
+       /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
+        * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
+        * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
+        * it is transmitted as all ones. The zero transmitted checksum means
+        * transmitter generated no checksum. Hence, enable csum offload only
+        * for ipv4 packets.
+        */
        if (DEFAULT_TX_CSUM_ENABLE)
-               dev->net->features |= NETIF_F_HW_CSUM;
+               dev->net->features |= NETIF_F_IP_CSUM;
        if (DEFAULT_RX_CSUM_ENABLE)
                dev->net->features |= NETIF_F_RXCSUM;
 
-       dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+       dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
 
        smsc95xx_init_mac_address(dev);