qlcnic: turn off lro when rxcsum is disabled.

o Also dont allow lro to be turn on, if rx csum is disabled

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlcnic/qlcnic.h

@@ -894,6 +894,7 @@ struct qlcnic_mac_req {
 #define QLCNIC_MSI_ENABLED		0x02
 #define QLCNIC_MSIX_ENABLED		0x04
 #define QLCNIC_LRO_ENABLED		0x08
+#define QLCNIC_LRO_DISABLED		0x00
 #define QLCNIC_BRIDGE_ENABLED       	0X10
 #define QLCNIC_DIAG_ENABLED		0x20
 #define QLCNIC_ESWITCH_ENABLED		0x40

drivers/net/qlcnic/qlcnic_ethtool.c

@@ -818,7 +818,21 @@ static u32 qlcnic_get_rx_csum(struct net_device *dev)
 static int qlcnic_set_rx_csum(struct net_device *dev, u32 data)
 {
 	struct qlcnic_adapter *adapter = netdev_priv(dev);
+
+	if (!!data) {
+		adapter->rx_csum = !!data;
+		return 0;
+	}
+
+	if (adapter->flags & QLCNIC_LRO_ENABLED) {
+		if (qlcnic_config_hw_lro(adapter, QLCNIC_LRO_DISABLED))
+			return -EIO;
+
+		dev->features &= ~NETIF_F_LRO;
+		qlcnic_send_lro_cleanup(adapter);
+	}
 	adapter->rx_csum = !!data;
+	dev_info(&adapter->pdev->dev, "disabling LRO as rx_csum is off\n");
 	return 0;
 }
 
@@ -1001,6 +1015,15 @@ static int qlcnic_set_flags(struct net_device *netdev, u32 data)
 	if (!(adapter->capabilities & QLCNIC_FW_CAPABILITY_HW_LRO))
 		return -EINVAL;
 
+	if (!adapter->rx_csum) {
+		dev_info(&adapter->pdev->dev, "rx csum is off, "
+			"cannot toggle lro\n");
+		return -EINVAL;
+	}
+
+	if ((data & ETH_FLAG_LRO) && (adapter->flags & QLCNIC_LRO_ENABLED))
+		return 0;
+
 	if (data & ETH_FLAG_LRO) {
 		hw_lro = QLCNIC_LRO_ENABLED;
 		netdev->features |= NETIF_F_LRO;

drivers/net/qlcnic/qlcnic_main.c

@@ -995,7 +995,7 @@ __qlcnic_up(struct qlcnic_adapter *adapter, struct net_device *netdev)
 
 	qlcnic_config_intr_coalesce(adapter);
 
-	if (adapter->capabilities & QLCNIC_FW_CAPABILITY_HW_LRO)
+	if (netdev->features & NETIF_F_LRO)
 		qlcnic_config_hw_lro(adapter, QLCNIC_LRO_ENABLED);
 
 	qlcnic_napi_enable(adapter);