illumos gate

TL;DR: When using a VNIC within a Zone that uses an exclusive netstack, nearly all link properties are missing (shown as "?").

Here's my setup:

In the Global zone, I have a physical ethernet data link, on top of which I have created a VNIC (named "vnic_propolis0"):

(GZ) $ dladm
LINK        CLASS     MTU    STATE    BRIDGE     OVER
igb0        phys      1500   up       --         --
vnic_propolis0 vnic   1500   up       --         igb0

Meanwhile, I have a running zone:

(GZ)  $ zoneadm list -cv
  ID NAME             STATUS     PATH                           BRAND    IP    
   0 global           running    /                              ipkg     shared
  47 instance_zone    running    /zone/instance_zone            sparse   excl  

And, again from the global zone, I can see link properties on the VNIC - such as the "zone" property, indicating it is being used by a non-global zone:

(GZ) $ dladm show-linkprop vnic_propolis0
LINK         PROPERTY        PERM VALUE          DEFAULT        POSSIBLE
vnic_propolis0 autopush      rw   --             --             -- 
vnic_propolis0 zone          rw   instance_zone  --             -- 
vnic_propolis0 state         r-   up             up             up,down 
vnic_propolis0 mtu           rw   1500           1500           60-1500 
...

This is all, as far as I can tell, expected behavior. However, when I zlogin to the zone, and try to show the link properties:

(Non-Global Zone) # dladm show-linkprop
LINK         PROPERTY        PERM VALUE          DEFAULT        POSSIBLE
vnic_propolis0 state         r-   ?              up             up,down 
vnic_propolis0 secondary-macs ?   ?              --             -- 
vnic_propolis0 maxbw         ?    ?              --             -- 
vnic_propolis0 cpus          ?    ?              --             -- 
vnic_propolis0 cpus-effective r-  ?              --             -- 
vnic_propolis0 pool          ?    ?              --             -- 
vnic_propolis0 pool-effective r-  ?              --             -- 
vnic_propolis0 priority      ?    ?              high           low,medium,high 
vnic_propolis0 tagmode       ?    ?              vlanonly       normal,vlanonly 

The properties are not visible.

Using truss, I see many invocations of:

ioctl(3, DLDIOC_GETMACPROP, 0x08111A48)         Err#2 ENOENT

Implying some visibility mismatch here.

Is this a bug? Is there a configuration I need to tweak to make data link properties accessible in the non-global zone?