DPDK with i225/226 on elkhartlake

[SamChen 陳嘉良]

Hi Qiming,
Thanks for your information. 
From the log of i226V, you can see that the string "Requested device 0000:03:00.0 cannot be used" appeared at init 03:00.0. 
Then its execution stopped at "EAL: Probe PCI driver: net_igc (8086:125c) device: 0000:06:00.0 (socket 0)" with no subsequent action.

If the device can be executed normally, the complete message should be like the i211_log attached, right?

Sam Chen

-----Original Message-----
From: Yang, Qiming <qiming.yang at intel.com> 
Sent: Friday, September 23, 2022 3:51 PM
To: SamChen 陳嘉良 <SamChen at aaeon.com.tw>; Richardson, Bruce <bruce.richardson at intel.com>
Cc: dev at dpdk.org
Subject: RE: DPDK with i225/226 on elkhartlake

Hi, Sam
We don't support I225-IT in 22.07 release, you can update you code to the latest next-net-intel branch, it contain the fix.
But for i226v's log, I don't see any issue, seems 06:00.0 init success. Could you clarify it?

Qiming 
> -----Original Message-----
> From: SamChen 陳嘉良 <SamChen at aaeon.com.tw>
> Sent: Thursday, September 22, 2022 10:57 AM
> To: Richardson, Bruce <bruce.richardson at intel.com>
> Cc: dev at dpdk.org
> Subject: RE: DPDK with i225/226 on elkhartlake
> 
> Hi all,
> I have switched to using vfio-pci, but still can't use DPDK. Attached 
> are the logs I can't use in I225-IT and I226V for your reference.
> If I have obtained other platforms with intel 225/226 systems, I will 
> check again, thanks!
> 
> Sam Chen
> 
> -----Original Message-----
> From: Bruce Richardson <bruce.richardson at intel.com>
> Sent: Wednesday, September 21, 2022 4:57 PM
> To: SamChen 陳嘉良 <SamChen at aaeon.com.tw>
> Cc: dev at dpdk.org
> Subject: Re: DPDK with i225/226 on elkhartlake
> 
> On Wed, Sep 21, 2022 at 03:23:09AM +0000, SamChen 陳嘉良 wrote:
> >    Hi,
> >    We bind the uio_pci_generic driver and use the command of the attached
> >    image to execute DPDK. However, we encountered the problem of device
> >    cannot be used on i225V/i226V in elkhartlake platform. Currently, the
> >    same method works fine for i211 and intel® Killer™ Ethernet E3100 2.5
> >    Gbps. Do you have any suggestions? Thanks!
> >
> Hi,
> 
> while I can't comment on the NIC-specific issues, I would just comment 
> that it's really not recommended to use uio_pci_generic - or any other 
> uio driver - for DPDK any more. You should consider switching to using 
> vfio-pci. Even if there is no iommu enabled, vfio-pci still tends to 
> give a better user experience. If iommu is enabled, you also get a lot 
> more security from the memory protection it provides.
> 
> Regards,
> /Bruce
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