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[netdevice] Add vlan_tag() to get the VLAN tag of a network device

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The iBFT has a VLAN field that should be filled in.  Add the
vlan_tag() function to extract the VLAN tag of a network device.

Since VLAN support is optional, define a weak function that returns 0
when iPXE is built without VLAN support.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Stefan Hajnoczi
2013-03-01 16:32:15 +01:00
committed by Michael Brown
parent 09c5109b85
commit 7426177d63
3 changed files with 29 additions and 0 deletions
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17
src/net/vlan.c
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@@ -282,6 +282,23 @@ struct net_protocol vlan_protocol __net_protocol = {
.rx = vlan_rx,
};
/**
* Get the VLAN tag
*
* @v netdev Network device
* @ret tag VLAN tag, or 0 if device is not a VLAN device
*/
unsigned int vlan_tag ( struct net_device *netdev ) {
struct vlan_device *vlan;
if ( netdev->op == &vlan_operations ) {
vlan = netdev->priv;
return vlan->tag;
} else {
return 0;
}
}
/**
* Check if network device can be used as a VLAN trunk device
*