[libvirt] <interface type='hostdev'>vf configuration cleanup when VM is delete

[Laine Stump]

On 12/16/2015 01:17 PM, Laine Stump wrote:
> On 12/16/2015 12:35 PM, Vlad Yasevich wrote:
>>
>>> (BTW, Cisco's enic driver, on the other hand, doesn't support 
>>> setting VF MAC addresses via
>>> a netlink message to the PF *at all* (so libvirt has to make special 
>>> accommodations), but
>> Looking at upstream, it looks like it offers support for setting VF 
>> mac via VFINFO data in
>> the netlink message.  May be it got fixed?
>>
>
> Interesting. If I had one of those systems of my own to test on, I'd 
> give it a try. The only one I have access to is running a 2.6.32 RHEL6 
> kernel though :-/

It also occurred to me during my copious "time to think" over the 
holidays that device assignment using <interface type='hostdev'> 
wouldn't work for enic cards if that wasn't supported, and I recently 
saw a bug filed where someone was doing exactly that on a 3.10 kernel 
(RHEL7.x), so yeah it must have been fixed between 2.6 and 3.10).

To pick up this discussion again: Moshe - am I correct to assume that 
you've filed a bug somewhere about the mlx driver not accepting 
00:00:00:00:00:00?

In the meantime, if setting the MAC address to, e.g., 00:00:00:00:00:01 
works for you (as implied when you said you use "ip link set dev p4p2 vf 
0 mac 0") then you could temporarily work around the problem by setting 
all the VFs to something like that at boot time - libvirt would then 
succeed at setting them *back* to those addresses when it was finished 
with each device.

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