e1000/e1000e/igb/ixgb/ixgbe: set NETIF_F_HIGHDMA for VLAN feature flags

If the netdev->features is set with NETIF_F_HIGHDMA, we should set the
corresponding netdev->vlan_features as well to allow VLAN netdev created
on top of the real netdev to be able to also benefit from HIGHDMA on 32bit
system, reducing the performance hit that is caused by __skb_linearize(),
particularly for large send. This is fixed in this patch for all Intel e1000,
e1000e, igb, ixgbe, and ixgbe drivers since this should be beneficial
to all devices supported by these drivers.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Tested-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000/e1000_main.c

@@ -988,8 +988,10 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 	   (hw->mac_type != e1000_82547))
 		netdev->features |= NETIF_F_TSO;
 
-	if (pci_using_dac)
+	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
 
 	netdev->vlan_features |= NETIF_F_TSO;
 	netdev->vlan_features |= NETIF_F_HW_CSUM;

drivers/net/e1000e/netdev.c

@@ -5683,8 +5683,10 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 	netdev->vlan_features |= NETIF_F_HW_CSUM;
 	netdev->vlan_features |= NETIF_F_SG;
 
-	if (pci_using_dac)
+	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
 
 	if (e1000e_enable_mng_pass_thru(&adapter->hw))
 		adapter->flags |= FLAG_MNG_PT_ENABLED;

drivers/net/igb/igb_main.c

@@ -1858,8 +1858,10 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 	netdev->vlan_features |= NETIF_F_IPV6_CSUM;
 	netdev->vlan_features |= NETIF_F_SG;
 
-	if (pci_using_dac)
+	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
 
 	if (hw->mac.type >= e1000_82576)
 		netdev->features |= NETIF_F_SCTP_CSUM;

drivers/net/ixgb/ixgb_main.c

@@ -446,8 +446,10 @@ ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			   NETIF_F_HW_VLAN_FILTER;
 	netdev->features |= NETIF_F_TSO;
 
-	if (pci_using_dac)
+	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
 
 	/* make sure the EEPROM is good */
 

drivers/net/ixgbe/ixgbe_main.c

@@ -6842,8 +6842,10 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 		netdev->vlan_features |= NETIF_F_FCOE_MTU;
 	}
 #endif /* IXGBE_FCOE */
-	if (pci_using_dac)
+	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
 
 	if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
 		netdev->features |= NETIF_F_LRO;