Setting cpu affinity for MSI-X on i.mx6 possible?

[Bjorn Helgaas]

On Mon, Oct 27, 2014 at 1:16 PM, Heiner Kallweit <heiner.kallweit at web.de> wrote:
> Thanks, Lucas.
>
> It's interesting however that the igb driver claims it's using MSI-X.
> Maybe the DW PCIE drivers offers MSI-X on the bus and just internally falls back to MSI?
>
> Rgds, Heiner
>
> [    4.165850] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.2.15-k
> [    4.172930] igb: Copyright (c) 2007-2014 Intel Corporation.
> [    4.178638] igb 0000:01:00.0: enabling device (0140 -> 0142)
> [    4.235789] igb 0000:01:00.0: added PHC on eth0
> [    4.235793] igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection
> [    4.235799] igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 00:01:c0:14:b1:58
> [    4.235804] igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF
> [    4.235810] igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)

What does "lspci -vvs01:00.0" say?  It *looks* like igb pays attention
to whether enabling MSI-X worked, but that path in the driver is not
completely trivial, and I got tired of tracing the code to verify it.

Bjorn