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[VLAN]: Propagate selected feature bits to VLAN devices

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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>
This commit is contained in:
Patrick McHardy
2008-05-20 14:54:50 -07:00
committed by David S. Miller
parent 7ff6e6f779
commit 5fb1357054
4 changed files with 41 additions and 2 deletions
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30
net/8021q/vlan.c
View File

@ -382,6 +382,24 @@ static void vlan_sync_address(struct net_device *dev,
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 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
}
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++) {