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[efi] Provide VLAN configuration protocol

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UEFI implements VLAN support within the Managed Network Protocol (MNP)
driver, which may create child VLAN devices automatically based on
stored UEFI variables.  These child devices do not themselves provide
a raw-packet interface via EFI_SIMPLE_NETWORK_PROTOCOL, and may be
consumed only via the EFI_MANAGED_NETWORK_PROTOCOL interface.

The device paths constructed for these child devices may conflict with
those for the EFI_SIMPLE_NETWORK_PROTOCOL instances that iPXE attempts
to install for its own VLAN devices.  The upshot is that creating an
iPXE VLAN device (e.g. via the "vcreate" command) will fail if the
UEFI Managed Network Protocol has already created a device for the
same VLAN tag.

Fix by providing our own EFI_VLAN_CONFIG_PROTOCOL instance on the same
device handle as EFI_SIMPLE_NETWORK_PROTOCOL.  This causes the MNP
driver to treat iPXE's device as supporting hardware VLAN offload, and
it will therefore not attempt to install its own instance of the
protocol.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-12-13 14:45:44 +00:00
parent 5e62b4bc6c
commit d879c8e4d9
6 changed files with 227 additions and 4 deletions
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3
src/net/vlan.c
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@@ -199,8 +199,7 @@ static void vlan_sync ( struct net_device *netdev ) {
* @v tag VLAN tag
* @ret netdev VLAN device, if any
*/
static struct net_device * vlan_find ( struct net_device *trunk,
unsigned int tag ) {
struct net_device * vlan_find ( struct net_device *trunk, unsigned int tag ) {
struct net_device *netdev;
struct vlan_device *vlan;