Re: issue using SRIOV "Unable to start - perhaps the PF driver is not up yet", while PF driver is actually up

[Andrew Cooper <andrew.cooper3@citrix.com>]

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On 10/09/12 11:34, Ashok Anand wrote:
>
>
>     Are you sure?  0f:10.0 is probably the physical function which you
>     must keep in dom0.
>
>     ~Andrew
>
>
> I find from xm pci-list-assignable-devices  that 0f:10.0 is available
> - it is also hidden from dom0 (using pciback.hide in kernel arguments)
>
> if that is not the case, which physical function i can assign to domU?
> i tried with 0f:11.6, and others too, but i got similar messages.

What does lspci -vv for the physical function say?

As for the physical function: it is unsafe to pass physical functions to
a non-trusted guest, as the physical function has complete control over
the all the virtual functions, even if they are passed through to other
guests.  For that reason, the physical function should remain in dom0
(or a device driver domain if you are going for disaggregation).

>
>
>
>>
>>     i attach 0f:10.0 to a domU ubuntu machine, xm pci-attach ubuntu
>>     0f:10.0
>>
>>     on my dom0 machine, i can ping other machine using eth2,
>>     (implying PF on eth2 is active)
>>
>>     on my domU machine, when i attach the virtual function, i get the
>>     following messages
>>
>>     [ 2282.688356 <tel:%5B%202282.688356>] ixgbevf 0000:00:00.0: Xen
>>     PCI mapped GSI0 to IRQ28
>>     [ 2282.688470 <tel:%5B%202282.688470>] ixgbevf 0000:00:00.0:
>>     setting latency timer to 64
>>     [ 2282.690187 <tel:%5B%202282.690187>] ixgbevf 0000:00:00.0: PF
>>     still in reset state, assigning new address
>>
>>     while PF on eth2 is  there and active, since i can ping other
>>     machine.
>>
>>     Now, when I try to bring up the VF interface on domU, 
>>      i get the following error
>>
>>      2476.295582] Unable to start - perhaps the PF Driver isn't up yet
>>     SIOCSIFFLAGS: Network is down
>>     [ 2476.296917] Unable to start - perhaps the PF Driver isn't up yet
>>     SIOCSIFFLAGS: Network is down
>>
>>     and on dmesg on domU, 
>>     [ 2476.295582] Unable to start - perhaps the PF Driver isn't up yet
>>     [ 2476.296917] Unable to start - perhaps the PF Driver isn't up yet
>>
>>
>>     Any thoughts on what could be wrong? I have been struggling with
>>     this for quite some time
>>     and would really appreciate your thoughts on it.
>>
>>     Thanks, 
>>     Ashok
>>
>>
>>
>>
>>
>>
>
>     -- 
>     Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
>     T: +44 (0)1223 225 900 <tel:%2B44%20%280%291223%20225%20900>, http://www.citrix.com
>
>
>     _______________________________________________
>     Xen-devel mailing list
>     Xen-devel@lists.xen.org <mailto:Xen-devel@lists.xen.org>
>     http://lists.xen.org/xen-devel
>
>

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com


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