Messages in this thread | | | From | "Rose, Gregory V" <> | Subject | RE: VFs go missing with latest kernel | Date | Wed, 1 Feb 2012 17:47:30 +0000 |
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> -----Original Message----- > From: Rose, Gregory V > Sent: Tuesday, January 31, 2012 5:03 PM > To: David Ahern > Cc: LKML > Subject: RE: VFs go missing with latest kernel > > > -----Original Message----- > > From: David Ahern [mailto:daahern@cisco.com] > > Sent: Tuesday, January 31, 2012 4:50 PM > > To: Rose, Gregory V > > Cc: LKML > > Subject: Re: VFs go missing with latest kernel > > > > On 01/31/2012 05:43 PM, Rose, Gregory V wrote: > > >> > > >> Back to the missing VF problem: reverting the patch I mentioned > before > > >> and my VM boots up fine with the even-numbered VFs assigned to it. > > > > > > OK, thanks... I was staring at the dmesg output you sent me and it is > > odd because the even numbered VFs that go missing are there when you set > > their MAC addresses. See output below the dotted line after my reply. > > > > Ah, I think I confused you. The VFs for the first 2 ports (ie., the > > first 14 VFs) are seen fine; I only showed the VFs for the second 2 > > ports -- which are missing the even number. > > > > So, in summary I am missing 7 VFs all associated with the even numbers > > on the last ports of a quad port card. > > OK, thanks for the clarification. But it still shows that all 28 VFs > exist while their MAC addresses are being set but then at some point > subsequent to that 7 of them on the port belonging to PCI device 07:00.0 > disappear for some reason. > > I'll see what I can find.
I found this in the log file you sent me. I had missed it yesterday.
[ 15.835223] igb 0000:07:00.0: 7 pre-allocated VFs found - override max_vfs setting of 7 [ 15.835393] igb 0000:07:00.0: 7 VFs allocated
I think that must be a bug in the code that searches for VFs already allocated and is the source of your problem. I'll keep you updated on what I find but it has to be a bug in the VF device lookups.
- Greg
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