* MSI-X vector allocation failure in upstream kernel
@ 2010-10-05 17:18 Anirban Chakraborty
2010-10-08 1:26 ` Benjamin Herrenschmidt
2010-10-13 1:51 ` Michael Ellerman
0 siblings, 2 replies; 3+ messages in thread
From: Anirban Chakraborty @ 2010-10-05 17:18 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Ameen Rahman
Hi All,
I am trying to test qlcnic driver (for 10Gb QLogic network adapter) on a Po=
wer 6 system=20
(IBM P 520, System type 8203) with upstream kernel and I do see that the ke=
rnel is=20
not able to allocate any MSI-X vectors. The driver requests for 4 vectors i=
n pci_enable_msix,
which returns 2. The driver again attempts, this time for 2 vectors but the=
kernel can't allocate=20
and it returns a value of 0xfffffffd. I upgraded the system FW to 01EL350 (=
from 01EL340)
just to make sure if MSI-X is enabled in the system. Is there anything tha=
t I am missing?=20
Any pointers will be highly appreciated.
thanks,
Anirban Chakraborty=
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: MSI-X vector allocation failure in upstream kernel
2010-10-05 17:18 MSI-X vector allocation failure in upstream kernel Anirban Chakraborty
@ 2010-10-08 1:26 ` Benjamin Herrenschmidt
2010-10-13 1:51 ` Michael Ellerman
1 sibling, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2010-10-08 1:26 UTC (permalink / raw)
To: Anirban Chakraborty; +Cc: linuxppc-dev, Michael Ellerman, Ameen Rahman
On Tue, 2010-10-05 at 10:18 -0700, Anirban Chakraborty wrote:
> Hi All,
>
> I am trying to test qlcnic driver (for 10Gb QLogic network adapter) on a Power 6 system
> (IBM P 520, System type 8203) with upstream kernel and I do see that the kernel is
> not able to allocate any MSI-X vectors. The driver requests for 4 vectors in pci_enable_msix,
> which returns 2. The driver again attempts, this time for 2 vectors but the kernel can't allocate
> and it returns a value of 0xfffffffd. I upgraded the system FW to 01EL350 (from 01EL340)
> just to make sure if MSI-X is enabled in the system. Is there anything that I am missing?
>
> Any pointers will be highly appreciated.
I think the people who can help you at the moment are on vacation :-)
Can you make sure kernel debug is enabled and you have "debug" on the
kernel command line, and send the full dmesg log of what's going on ?
Hopefully, Michael will be back next week and will be able to have a
look at it.
Cheers,
Ben.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: MSI-X vector allocation failure in upstream kernel
2010-10-05 17:18 MSI-X vector allocation failure in upstream kernel Anirban Chakraborty
2010-10-08 1:26 ` Benjamin Herrenschmidt
@ 2010-10-13 1:51 ` Michael Ellerman
1 sibling, 0 replies; 3+ messages in thread
From: Michael Ellerman @ 2010-10-13 1:51 UTC (permalink / raw)
To: Anirban Chakraborty; +Cc: linuxppc-dev, Ameen Rahman
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On Tue, 2010-10-05 at 10:18 -0700, Anirban Chakraborty wrote:
> Hi All,
>
> I am trying to test qlcnic driver (for 10Gb QLogic network adapter) on a Power 6 system
> (IBM P 520, System type 8203) with upstream kernel and I do see that the kernel is
> not able to allocate any MSI-X vectors. The driver requests for 4 vectors in pci_enable_msix,
> which returns 2.
OK, that's the platform code saying it can only support 2, that seems
low, but it's possible.
> The driver again attempts, this time for 2 vectors but the kernel can't allocate
> and it returns a value of 0xfffffffd.
OK, that's odd. That is -3, which AFAICS we don't return from the linux
code. So it must be coming from firmware? In which case it would be
"parameter error".
> I upgraded the system FW to 01EL350 (from 01EL340) just to make sure
> if MSI-X is enabled in the system.
Is that the latest FW version?
Adding #define DEBUG at the top of arch/powerpc/platforms/pseries/msi.c
will give us lots of useful info.
Or you can enable CONFIG_DYNAMIC_DEBUG, and enable it that way.
cheers
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^ permalink raw reply [flat|nested] 3+ messages in thread
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