net: vlan: enable soft features regardless of underlying device
Shan Wei [Wed, 6 Jul 2011 03:43:12 +0000 (20:43 -0700)]
If gso/gro feature of underlying device is turned off,
then new created vlan device never can turn gso/gro on.

Although underlying device don't support TSO, we still
should use software segments for vlan device.

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/8021q/vlan_dev.c

index 7ea5cf9..86bff9b 100644 (file)
@@ -586,9 +586,14 @@ static void vlan_dev_uninit(struct net_device *dev)
 static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
 {
        struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
+       u32 old_features = features;
 
        features &= real_dev->features;
        features &= real_dev->vlan_features;
+
+       if (old_features & NETIF_F_SOFT_FEATURES)
+               features |= old_features & NETIF_F_SOFT_FEATURES;
+
        if (dev_ethtool_get_rx_csum(real_dev))
                features |= NETIF_F_RXCSUM;
        features |= NETIF_F_LLTX;