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Created attachment 1027699[details]
lspci --vvv (output for enp2s0f0)
Description of problem:
The host has two SR-IOV nics- enp2s0f0 and enp2s0f1.
enp2s0f0 works fine.
However, when trying to configure VFs on enp2s0f1 the following error is thrown- kernel: igb 0000:02:00.1: not enough MMIO resources for SR-IOV.
Version-Release number of selected component (if applicable):
How reproducible:
100%
Steps to Reproduce:
1. ssh root.16.144
2. echo 1 > /sys/class/net/enp2s0f1/device/sriov_numvfs
Actual results:
-bash: echo: write error: Cannot allocate memory
journalctl output-
May 20 12:41:02 nari04.eng.lab.tlv.redhat.com kernel: igb 0000:02:00.1: not enough MMIO resources for SR-IOV
Expected results:
Succeed creating VFs on enp2s0f1.
Additional info:
The host's ip- nari04.eng.lab.tlv.redhat.com (10.35.16.144).
Kernel version- 3.10.0-229.4.2.el7.x86_64
sriov driver- igb (version- 5.2.13-k)
Ethernet controller- Intel Corporation 82576 Gigabit Network Connection (rev 01)
The non operational (second) card has:
---
Capabilities: [160 v1] Single Root I/O Virtualization (SR-IOV)
IOVCap: Migration-, Interrupt Message Number: 000
IOVCtl: Enable- Migration- Interrupt- MSE- ARIHierarchy-
IOVSta: Migration-
Initial VFs: 8, Total VFs: 8, Number of VFs: 0, Function Dependency Link: 01
VF offset: 128, stride: 2, Device ID: 10ca
Supported Page Size: 00000553, System Page Size: 00000001
Region 0: Memory at 0000000000000000 (64-bit, non-prefetchable)
Region 3: Memory at 0000000000000000 (64-bit, non-prefetchable)
VF Migration: offset: 00000000, BIR: 0
---
Notice the 0 at regions.
This happens at two different machines, it is not specific to a single configuration.
Kernel command-line includes intel_iommu=on.
Alon tried to reproduce the issue using vanilla kernel (3.18.12). It seems to be even worse, it was impossible to create VFs on both of the nics (both of them had 0 at regions).
Not enough MMIO resources is a BIOS issue, so you might check if there's a newer BIOS available. If none of the suggested workarounds help you're pretty much out of luck.
There's been a similar case, discussed in bug #723583.
Going to close this as CANTFIX, as it is a BIOS issue and possible workarounds have been listed.
Created attachment 1027699 [details] lspci --vvv (output for enp2s0f0) Description of problem: The host has two SR-IOV nics- enp2s0f0 and enp2s0f1. enp2s0f0 works fine. However, when trying to configure VFs on enp2s0f1 the following error is thrown- kernel: igb 0000:02:00.1: not enough MMIO resources for SR-IOV. Version-Release number of selected component (if applicable): How reproducible: 100% Steps to Reproduce: 1. ssh root.16.144 2. echo 1 > /sys/class/net/enp2s0f1/device/sriov_numvfs Actual results: -bash: echo: write error: Cannot allocate memory journalctl output- May 20 12:41:02 nari04.eng.lab.tlv.redhat.com kernel: igb 0000:02:00.1: not enough MMIO resources for SR-IOV Expected results: Succeed creating VFs on enp2s0f1. Additional info: The host's ip- nari04.eng.lab.tlv.redhat.com (10.35.16.144). Kernel version- 3.10.0-229.4.2.el7.x86_64 sriov driver- igb (version- 5.2.13-k) Ethernet controller- Intel Corporation 82576 Gigabit Network Connection (rev 01)