[PATCH] forcedeth: decouple vlan and rx checksum dependency

This patch decouples the dependency between the rx checksum feature and
vlan feature. This is done by ignoring the checksum information if the
user has disabled rx checksum when vlan is enabled.
Signed-Off-By: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/forcedeth.c

@@ -718,6 +718,7 @@ struct fe_priv {
 	u32 vlanctl_bits;
 	u32 driver_data;
 	u32 register_size;
+	int rx_csum;
 
 	void __iomem *base;
 
@@ -1897,7 +1898,7 @@ static int nv_rx_process(struct net_device *dev, int limit)
 					}
 				}
 			}
-			if (np->txrxctl_bits & NVREG_TXRXCTL_RXCHECK) {
+			if (np->rx_csum) {
 				flags &= NV_RX2_CHECKSUMMASK;
 				if (flags == NV_RX2_CHECKSUMOK1 ||
 				    flags == NV_RX2_CHECKSUMOK2 ||
@@ -3557,7 +3558,7 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
 static u32 nv_get_rx_csum(struct net_device *dev)
 {
 	struct fe_priv *np = netdev_priv(dev);
-	return (np->txrxctl_bits & NVREG_TXRXCTL_RXCHECK) != 0;
+	return (np->rx_csum) != 0;
 }
 
 static int nv_set_rx_csum(struct net_device *dev, u32 data)
@@ -3567,22 +3568,15 @@ static int nv_set_rx_csum(struct net_device *dev, u32 data)
 	int retcode = 0;
 
 	if (np->driver_data & DEV_HAS_CHECKSUM) {
-
-		if (((np->txrxctl_bits & NVREG_TXRXCTL_RXCHECK) && data) ||
-		    (!(np->txrxctl_bits & NVREG_TXRXCTL_RXCHECK) && !data)) {
-			/* already set or unset */
-			return 0;
-		}
-
 		if (data) {
+			np->rx_csum = 1;
 			np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
-		} else if (!(np->vlanctl_bits & NVREG_VLANCONTROL_ENABLE)) {
-			np->txrxctl_bits &= ~NVREG_TXRXCTL_RXCHECK;
 		} else {
-			printk(KERN_INFO "Can not disable rx checksum if vlan is enabled\n");
-			return -EINVAL;
+			np->rx_csum = 0;
+			/* vlan is dependent on rx checksum offload */
+			if (!(np->vlanctl_bits & NVREG_VLANCONTROL_ENABLE))
+				np->txrxctl_bits &= ~NVREG_TXRXCTL_RXCHECK;
 		}
-
 		if (netif_running(dev)) {
 			spin_lock_irq(&np->lock);
 			writel(np->txrxctl_bits, base + NvRegTxRxControl);
@@ -4322,6 +4316,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 		np->pkt_limit = NV_PKTLIMIT_2;
 
 	if (id->driver_data & DEV_HAS_CHECKSUM) {
+		np->rx_csum = 1;
 		np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
 		dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
 #ifdef NETIF_F_TSO