[VLAN]: Propagate selected feature bits to VLAN devices
Propagate feature bits from the NETDEV_FEAT_CHANGE notifier. For now
only TSO is propagated for devices that announce their ability to
support TSO in combination with VLAN accel by setting the NETIF_F_VLAN_TSO
flag.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index b934159..5196130 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -382,6 +382,24 @@
memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
}
+static void vlan_transfer_features(struct net_device *dev,
+ struct net_device *vlandev)
+{
+ unsigned long old_features = vlandev->features;
+
+ if (dev->features & NETIF_F_VLAN_TSO) {
+ vlandev->features &= ~VLAN_TSO_FEATURES;
+ vlandev->features |= dev->features & VLAN_TSO_FEATURES;
+ }
+ if (dev->features & NETIF_F_VLAN_CSUM) {
+ vlandev->features &= ~NETIF_F_ALL_CSUM;
+ vlandev->features |= dev->features & NETIF_F_ALL_CSUM;
+ }
+
+ if (old_features != vlandev->features)
+ netdev_features_change(vlandev);
+}
+
static void __vlan_device_event(struct net_device *dev, unsigned long event)
{
switch (event) {
@@ -448,6 +466,18 @@
}
break;
+ case NETDEV_FEAT_CHANGE:
+ /* Propagate device features to underlying device */
+ for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+ vlandev = vlan_group_get_device(grp, i);
+ if (!vlandev)
+ continue;
+
+ vlan_transfer_features(dev, vlandev);
+ }
+
+ break;
+
case NETDEV_DOWN:
/* Put all VLANs for this dev in the down state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {