[dpdk-dev] Issues of MSIx interrupt enable with user space driver

[Zhou, Danny]

DPDK is aimed to drive PCIe NIC device for high performance packet processing only. While we do have a Waikiki Beach project that
integrates user space DPDK PMD and NVMe poll mode iSCSI target and NVMe backend together to improve performance of storage.

> -----Original Message-----
> From: James (Fei) Liu-SSI [mailto:james.liu at ssi.samsung.com]
> Sent: Thursday, April 30, 2015 2:26 AM
> To: Zhou, Danny; dev at dpdk.org
> Cc: Liang, Cunming
> Subject: RE: [dpdk-dev] Issues of MSIx interrupt enable with user space driver
> 
> Hi Danny,
> 
>   Thanks  a lot for your promptly answer. I am going to check your patch soon. In the mean time, Have you guys ever try DPDK
> with PCIe storage device?
> 
>  Regards,
>  James
> 
> -----Original Message-----
> From: Zhou, Danny [mailto:danny.zhou at intel.com]
> Sent: Tuesday, April 28, 2015 4:19 PM
> To: James (Fei) Liu-SSI; dev at dpdk.org
> Cc: Liang, Cunming
> Subject: RE: [dpdk-dev] Issues of MSIx interrupt enable with user space driver
> 
> The V6 "Interrupt PMD" patch has been sent out to DPDK.org 2 months ago, and V7 is under development with changes to
> include more generic APIs that could support all kinds of interrupts (e.g. HW Rx interrupt and SW ring interrupt).
> 
> Stay tuned.
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of James (Fei)
> > Liu-SSI
> > Sent: Wednesday, April 29, 2015 5:58 AM
> > To: dev at dpdk.org
> > Subject: [dpdk-dev] Issues of MSIx interrupt enable with user space
> > driver
> >
> > Hi All,
> >     We are porting driver from kernel into user space driver with DPDK
> > for one of our devices. Polling thread works fine without any issue.
> > However, we want to switch from polling to interrupt based handler. While we enable interrupt with VFIO MSIx, we always get
> below errors after issuing one command:
> >
> > [  465.464186] dmar: DRHD: handling fault status reg 2 [  465.464194]
> > dmar: INTR-REMAP: Request device [[02:00.0] fault index 27 [
> > 465.464194] INTR-REMAP:[fault reason 34] Present field in the IRTE
> > entry is clear
> >
> > Here are steps we follow to enable interrupt:
> > 1. --vfio-intr msix   was passed in as parameter for rte_eal_init
> > 2. rte_intr_enable was called during the drive probe stage.
> > 3. rte_intr_callback_register was called after interrupt was enabled
> >
> >
> >
> > Is there anyone in the forum who worked on the interrupt handler to
> > share with us about your comments? thanks for your help in advance.
> >
> > Regards,
> > James
> >