net: vlan: enable soft features regardless of underlying device
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>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 7ea5cf9..86bff9b 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -586,9 +586,14 @@
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;