Commit fe0cd8ca authored by Nisar Sayed's avatar Nisar Sayed Committed by David S. Miller
Browse files

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: default avatarNisar Sayed <Nisar.Sayed@microchip.com>

Reported-by: default avatarpopcorn mix <popcornmix@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 776ee323

drivers/net/usb/smsc95xx.c

+10 −3
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE