[dpdk-dev] iommu Error on DL380 G8 with RHEL 7.1

[Rapelly, Varun]

Hi All,

I'm not able to send packets through OVS bridge [with dpdk] when iommu is enabled on HP DL380 G8 [RHEL 7.1]. Getting following errors in dmesg.

[    0.657681] IOMMU: Setting identity map for device 0000:01:00.2 [0xbdff6000 - 0xbdffcfff]
[    0.657686] IOMMU: Prepare 0-16MiB unity mapping for LPC
[ 4458.091522] dmar: DMAR:[DMA Read] Request device [0a:00.0] fault addr 1a633d000
DMAR:[fault reason 06] PTE Read access is not set
[ 4458.164541] dmar: DMAR:[DMA Read] Request device [0a:00.0] fault addr 1a633d000
DMAR:[fault reason 06] PTE Read access is not set
[ 4458.337565] dmar: DMAR:[DMA Read] Request device [0a:00.1] fault addr 1a63cd000
DMAR:[fault reason 06] PTE Read access is not set
[ 4458.637356] dmar: DMAR:[DMA Read] Request device [0a:00.0] fault addr 1a637d000
DMAR:[fault reason 06] PTE Read access is not set

Where as in another machine ProLiant DL380 G7 [RHEL 7.1] everything works fine. Is it something do with the hardware on Gen8 machine?

The following link shows the similar problem.

http://comments.gmane.org/gmane.comp.networking.dpdk.devel/2281

In the below HP link, they quoted the same problem. I upgraded ROM to the latest version, but no luck. :(

http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03323800



We need this flag to be enabled [SR-IOV] on that machine.



Please let me know, is there any way to resolve this issue?

Regards,
Varun