Comment 6 for bug 1541544

------- Comment From <email address hidden> 2016-02-08 05:39 EDT-------
Virt.NIC QDIO - depends on the z/VM layer configured, more details below
Virt.NIC Hiper - always layer3
Virt.NIC OSM - that's dead code, does not occur, I will add the removal on my to do list, any default is ok
Virt.NIC OSX - that's dead code, does not occur, I will add the removal on my to do list, any default is ok
unknown - should hopefully not occur, thus any default is ok
OSD_100 - both layers possible, use layer2 as default
HSTR - token ring no longer supported, does not occur, has been layer3 only
OSD_1000 - both layers possible, use layer2 as default
OSD_10GIG - both layers possible, use layer2 as default
OSD_FE_LANE - outdated type, does no longer occur, has been layer3 only
OSD_TR_LANE - token ring no longer supported, does not occur, has been layer3 only
OSD_GbE_LANE - outdated type, does no longer occur, has been layer3 only
OSD_ATM_LANE - outdated type, does no longer occur, has been layer3 only
OSD_Express - both layers possible, use layer2 as default
HiperSockets - both layers possible, use layer3 as default
OSN - special case, needed for an IBM product already approaching end of life time (end of service effective 2016-03-31), does not have a layer2 attribute at all, ignore?
OSM_1000 - always layer2
OSX_10GIG - both layers possible, use layer2 as default

As you see, there are still some outdated OSA-types listed, which we have not yet removed to still enable running on old hardware. They are not critical, and you can configure them as you like.

A problematic type is "Virt.NIC QDIO". Here qeth does not yet determine the layer of the z/VM VSWITCH automatically. zVM commands allow to determine the layer. You could first determine the name of the VSWITCH, a virtual NIC is connected to - with "vmcp q virtual nic <vdev>" .
Sample:
> vmcp QUERY VIRTUAL NIC f5f0
Adapter F5F0.P00 Type: QDIO Name: HYD1G1 Devices: 3
MAC: 02-12-34-56-78-90 VSWITCH: SYSTEM VSW444
Here "VSW444" is the name of the VSWITCH. Then you can determine the layer of the VSWITCH with "vmcp q vswitch <vswitch name>".
Sample:
> vmcp QUERY VSWITCH VSW444
VSWITCH SYSTEM VSW444 Type: QDIO Connected: 9 Maxconn: INFINITE
PERSISTENT RESTRICTED ETHERNET Accounting: OFF
...
The keyword here is "ETHERNET". In this case layer2 must be configured for the virtual NIC, otherwise layer3.