3.11-rc4 ixgbevf: endless "Last Request of type 00 to PF Nacked" messages

[Bjorn Helgaas]

When I enable VFs via sysfs on an Intel X540-AT, I see an endless stream of

    ixgbevf 0000:08:10.2: Last Request of type 03 to PF Nacked

messages.  This on an HP z420 with the Intel X540-AT in external Magma
PCIe expansion chassis.  No cable is attached to the X540-AT.

ixgbe is built as a module and is auto-loaded during boot, with no VFs
enabled.  The "Last request Nacked" messages start when I enable VFs
with:

    # echo -n 8 > /sys/bus/pci/devices/0000:08:00.0/sriov_numvfs
    ixgbe 0000:08:00.0 eth1: SR-IOV enabled with 8 VFs
    pci 0000:08:10.0: [8086:1515] type 00 class 0x020000
    pci 0000:08:10.2: [8086:1515] type 00 class 0x020000
    ...
    ixgbevf: Intel(R) 10 Gigabit PCI Express Virtual Function Network
Driver - version 2.7.12-k
    ...
    ixgbevf 0000:08:10.2: Last Request of type 03 to PF Nacked
    ...

This happens with v3.11-rc4, v3.10, and v3.9, which is as far back as
I checked.  Complete console log and lspci output are here:

    http://helgaas.com/linux/ixgbe/z420.log
    http://helgaas.com/linux/ixgbe/lspci
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