[dpdk-users] How DPDK initialize PCIe DMA engine?

[dpdk-users] How DPDK initialize PCIe DMA engine?

[Yuan Kevin]

Dear DPDK Community members,

I am new to DPDK. After reading through the documentation and doing web search a couple of days, I am still not clear how DPDK initialize PCIe DMA engine.

As far as I know, the PCIe scan / probe / intialization is pretty standardized, but the DMA engines along with the PCIe are very different from vendor to vendor.

My question is, what's the best place to implement the DMA initilization code within the DPDK framework and how?

Could you give me an example ?

Best regards.



Thanks,


Kevin Yuan

Re: [dpdk-users] How DPDK initialize PCIe DMA engine?

[Van Haaren, Harry]

> -----Original Message-----
> From: users [mailto:users-bounces@dpdk.org] On Behalf Of Yuan Kevin
> Sent: Sunday, September 1, 2019 2:29 PM
> To: users@dpdk.org
> Subject: [dpdk-users] How DPDK initialize PCIe DMA engine?
> 
> Dear DPDK Community members,

Hi Kevin!


> I am new to DPDK. After reading through the documentation and doing web search
> a couple of days, I am still not clear how DPDK initialize PCIe DMA engine.
> 
> As far as I know, the PCIe scan / probe / intialization is pretty
> standardized, but the DMA engines along with the PCIe are very different from
> vendor to vendor.
> 
> My question is, what's the best place to implement the DMA initilization code
> within the DPDK framework and how?
> 
> Could you give me an example ?

There is a DMA engine driver which has been upstreamed in the 19.08 release,
please see the patchset cover-letter here; http://patches.dpdk.org/cover/55872/

The cover letter gives lots of details, and the 9 patches following it enable
the device itself. Patch 2/9 is the patch that enables a new PCI device to register
as a rawdev, which is probably the best way to enable your device:
http://patches.dpdk.org/patch/55874/


> Best regards.
> 
> Thanks,
> Kevin Yuan

Hope that helps, -Harry