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>

5 files changed, 15 insertions, 5 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 8d9269d12a67..a1daceadca84 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/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;
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index e2c7e0d767b1..4630bad52e74 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/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;
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 61892b80d7ad..f915e9cb302e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/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;
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index c2f6e71e1181..80e62578ffa0 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/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 */
 
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index d03eef96c0ba..0ec4ef2d819e 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/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;