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[vlan] Provide vlan_can_be_trunk()

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-11-26 00:58:36 +00:00
parent f1e1545372
commit b4706c88c9
2 changed files with 24 additions and 8 deletions
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1
src/include/ipxe/vlan.h
View File

@ -59,6 +59,7 @@ struct vlan_header {
*/
#define VLAN_PRIORITY_IS_VALID( priority ) ( (priority) <= 7 )
extern int vlan_can_be_trunk ( struct net_device *trunk );
extern int vlan_create ( struct net_device *trunk, unsigned int tag,
unsigned int priority );
extern int vlan_destroy ( struct net_device *netdev );

31
src/net/vlan.c
View File

@ -280,20 +280,35 @@ struct net_protocol vlan_protocol __net_protocol = {
};
/**
* Create VLAN device
* Check if network device can be used as a VLAN trunk device
*
* @v trunk Trunk network device
* @v tag VLAN tag
* @v priority Default VLAN priority
* @ret rc Return status code
* @ret is_ok Trunk network device is usable
*
* The VLAN device will be created as an Ethernet device. (We cannot
* VLAN devices will be created as Ethernet devices. (We cannot
* simply clone the link layer of the trunk network device, because
* this link layer may expect the network device structure to contain
* some link-layer-private data.) The trunk network device must
* therefore have a link layer that is in some sense 'compatible' with
* Ethernet; specifically, it must have link-layer addresses that are
* the same length as Ethernet link-layer addresses.
*
* As an additional check, and primarily to assist with the sanity of
* the FCoE code, we refuse to allow nested VLANs.
*/
int vlan_can_be_trunk ( struct net_device *trunk ) {
return ( ( trunk->ll_protocol->ll_addr_len == ETH_ALEN ) &&
( trunk->op != &vlan_operations ) );
}
/**
* Create VLAN device
*
* @v trunk Trunk network device
* @v tag VLAN tag
* @v priority Default VLAN priority
* @ret rc Return status code
*/
int vlan_create ( struct net_device *trunk, unsigned int tag,
unsigned int priority ) {
@ -313,9 +328,9 @@ int vlan_create ( struct net_device *trunk, unsigned int tag,
}
/* Sanity checks */
if ( trunk->ll_protocol->ll_addr_len != ETH_ALEN ) {
DBGC ( trunk, "VLAN %s cannot create VLAN for %s device\n",
trunk->name, trunk->ll_protocol->name );
if ( ! vlan_can_be_trunk ( trunk ) ) {
DBGC ( trunk, "VLAN %s cannot create VLAN on non-trunk "
"device\n", trunk->name );
rc = -ENOTTY;
goto err_sanity;
}