Public bug reported:
Cavium engineers are testing SR-IOV feature with Cavium's new liquidIO
card (based on OCTEON processor running as an intelligent NIC) on x86
Dell servers and ran into the issue described below.
They are *not* seeing this issue on Intel 82599 NIC.
So far, they have seen this on multiple Dell servers - T5810 & Dell
T630 (x86 - Ubuntu certified).
We are testing a Cavium OCTEON device in EP mode with SRIOV. With a CentOS7 VM
running on the Ubuntu 14.04.2 host (using VFIO) we see that a single PCI read
or write transaction targeting the device’s BAR0 issued from the VM appears
twice on the PCIe bus. The same accesses work fine when the VF is accessed
directly from the Ubuntu 14.04.2 host. These BAR0 PCI accesses do not require a
driver on the VM side. We can reproduce the problem using a simple user-space
application to access the VF’s BAR0 registers.
We do not see this problem when the VM runs within a CentOS 7 host or under a
Ubuntu 12.04 host. This appears specific to Ubuntu 14.04 release. Appreciate
your help in any clues or pointers to this behavior.
This issue is also not happening with 16.04 beta.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Joseph Salisbury (jsalisbury)
Status: In Progress
** Tags: kernel-da-key trusty wily
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1563375
Title:
A a single PCI read or write appears twice on the PCIe bus. This
happens when using the SR-IOV feature with Cavium's liquidIO card
Status in linux package in Ubuntu:
In Progress
Bug description:
Cavium engineers are testing SR-IOV feature with Cavium's new
liquidIO card (based on OCTEON processor running as an intelligent
NIC) on x86 Dell servers and ran into the issue described below.
They are *not* seeing this issue on Intel 82599 NIC.
So far, they have seen this on multiple Dell servers - T5810 & Dell
T630 (x86 - Ubuntu certified).
We are testing a Cavium OCTEON device in EP mode with SRIOV. With a CentOS7
VM running on the Ubuntu 14.04.2 host (using VFIO) we see that a single PCI
read or write transaction targeting the device’s BAR0 issued from the VM
appears twice on the PCIe bus. The same accesses work fine when the VF is
accessed directly from the Ubuntu 14.04.2 host. These BAR0 PCI accesses do not
require a driver on the VM side. We can reproduce the problem using a simple
user-space application to access the VF’s BAR0 registers.
We do not see this problem when the VM runs within a CentOS 7 host or under a
Ubuntu 12.04 host. This appears specific to Ubuntu 14.04 release. Appreciate
your help in any clues or pointers to this behavior.
This issue is also not happening with 16.04 beta.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563375/+subscriptions
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