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[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>
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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6
include/linux/netdevice.h
View File

@ -514,10 +514,12 @@ struct net_device
#define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces */
#define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */
#define NETIF_F_LRO 32768 /* large receive offload */
#define NETIF_F_VLAN_TSO 65536 /* Supports TSO for VLANs */
#define NETIF_F_VLAN_CSUM 131072 /* Supports TX checksumming for VLANs */
/* Segmentation offload features */
#define NETIF_F_GSO_SHIFT 16
#define NETIF_F_GSO_MASK 0xffff0000
#define NETIF_F_GSO_SHIFT 20
#define NETIF_F_GSO_MASK 0xfff00000
#define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
#define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
#define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)

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++) {

2
net/8021q/vlan.h
View File

@ -7,6 +7,8 @@
#define VLAN_GRP_HASH_SIZE (1 << VLAN_GRP_HASH_SHIFT)
#define VLAN_GRP_HASH_MASK (VLAN_GRP_HASH_SIZE - 1)
#define VLAN_TSO_FEATURES (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_SG)
/* Find a VLAN device by the MAC address of its Ethernet device, and
* it's VLAN ID. The default configuration is to have VLAN's scope
* to be box-wide, so the MAC will be ignored. The mac will only be

5
net/8021q/vlan_dev.c
View File

@ -663,6 +663,11 @@ static int vlan_dev_init(struct net_device *dev)
(1<<__LINK_STATE_DORMANT))) |
(1<<__LINK_STATE_PRESENT);
if (real_dev->features & NETIF_F_VLAN_TSO)
dev->features |= real_dev->features & VLAN_TSO_FEATURES;
if (real_dev->features & NETIF_F_VLAN_CSUM)
dev->features |= real_dev->features & NETIF_F_ALL_CSUM;
/* ipv6 shared card related stuff */
dev->dev_id = real_dev->dev_id;