* RE: mlx4 fails ("go bit not cleared") without MSI
[not found] ` <CAErSpo5PsAvix815Z1Ge5-UTx5z-0m5W2p4F9J=s8AB03=C+Dw@mail.gmail.com>
@ 2016-01-20 9:42 ` Yishai Hadas
2016-01-20 17:00 ` Bjorn Helgaas
0 siblings, 1 reply; 3+ messages in thread
From: Yishai Hadas @ 2016-01-20 9:42 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: helgaas, Majd Dibbiny, Tal Alon,
Or Gerlitz (gerlitz.or@gmail.com),
netdev
> From: Bjorn Helgaas [mailto:bhelgaas@google.com]
> I assume you're tried booting with "pci=nomsi" or "mlx_core.msi_x=0"
> and it works for you? Note that my board might be an internal design,
> not a Mellanox board, so if it works for you, we can probably just
> ignore this as being an artifact of the internal design.
Yes, it works for me (module parameter msi_x=0), as you pointed out above
you are not using Mellanox board but some internal design and
it might be some artifact of.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mlx4 fails ("go bit not cleared") without MSI
2016-01-20 9:42 ` mlx4 fails ("go bit not cleared") without MSI Yishai Hadas
@ 2016-01-20 17:00 ` Bjorn Helgaas
0 siblings, 0 replies; 3+ messages in thread
From: Bjorn Helgaas @ 2016-01-20 17:00 UTC (permalink / raw)
To: Yishai Hadas
Cc: helgaas, Majd Dibbiny, Tal Alon,
Or Gerlitz (gerlitz.or@gmail.com),
netdev
On Wed, Jan 20, 2016 at 3:42 AM, Yishai Hadas <yishaih@mellanox.com> wrote:
>> From: Bjorn Helgaas [mailto:bhelgaas@google.com]
>> I assume you're tried booting with "pci=nomsi" or "mlx_core.msi_x=0"
>> and it works for you? Note that my board might be an internal design,
>> not a Mellanox board, so if it works for you, we can probably just
>> ignore this as being an artifact of the internal design.
>
> Yes, it works for me (module parameter msi_x=0), as you pointed out above
> you are not using Mellanox board but some internal design and
> it might be some artifact of.
OK, let's assume that's the case. I haven't seen the actual board, so
I can't be certain what I'm using. Thanks for checking into it.
Bjorn
^ permalink raw reply [flat|nested] 3+ messages in thread
* mlx4 fails ("go bit not cleared") without MSI
@ 2016-01-13 22:08 Bjorn Helgaas
0 siblings, 0 replies; 3+ messages in thread
From: Bjorn Helgaas @ 2016-01-13 22:08 UTC (permalink / raw)
To: Eugenia Emantayev; +Cc: netdev, linux-kernel
Hi Eugenia,
Due to my own stupidity, I tried to use mlx4 without turning on
CONFIG_PCI_MSI=y. The driver failed miserably:
pci 0000:01:00.0: [15b3:1007] type 00 class 0x020000
mlx4_core: Mellanox ConnectX core driver v2.2-1 (Feb, 2014)
mlx4_core: Initializing 0000:01:00.0
mlx4_core 0000:01:00.0: PCIe link speed is 8.0GT/s, device supports 8.0GT/s
mlx4_core 0000:01:00.0: PCIe link width is x8, device supports x8
mlx4_core 0000:01:00.0: command 0x23 timed out (go bit not cleared)
mlx4_core 0000:01:00.0: device is going to be reset
mlx4_core 0000:01:00.0: device was reset successfully
mlx4_core 0000:01:00.0: Failed to initialize queue pair table, aborting
mlx4_core: probe of 0000:01:00.0 failed with error -5
The lack of MSI was my own fault, but it took me a long time to figure it
out.
The fact that mlx4 has a "msi_x" module parameter makes me think that
mlx4 is *supposed* to work without MSI. Would you consider either
fixing the non-MSI fallback path, or printing a warning when the
driver can't set up MSIs?
This is easy to reproduce; just turn off CONFIG_PCI_MSI or boot with
"pci=nomsi".
Bjorn
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-01-20 9:42 ` mlx4 fails ("go bit not cleared") without MSI Yishai Hadas
2016-01-20 17:00 ` Bjorn Helgaas
2016-01-13 22:08 Bjorn Helgaas
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