[dpdk-dev] DPDK and custom memory

Alex Markuze alex at weka.io
Sun Aug 31 10:27:05 CEST 2014

Artur, I don't have the details of what you are trying to achieve, but
it sounds like something that is covered by IOMMU, SW or HW.  The
IOMMU creates an iova (I/O Virtual address) the nic can access the
range is controlled with flags passed to the dma_map functions.

So I understand your question this way, How does the DPDK work with
IOMMU enabled system and can you influence the mapping?

On Sat, Aug 30, 2014 at 4:03 PM, Thomas Monjalon
<thomas.monjalon at 6wind.com> wrote:
> Hello,
> 2014-08-29 18:40, Saygin, Artur:
>> Imagine a PMD for an FPGA-based NIC that is limited to accessing certain
>> memory regions <system, PCI, etc>.
> Does it mean Intel is making an FPGA-based NIC?
>> Is there a way to make DPDK use that exact memory?
> Maybe I don't understand the question well, because it doesn't seem really
> different of what other PMDs do.
> Assuming your NIC is PCI, you can access it via uio (igb_uio) or VFIO.
>> Perhaps this is more of a hugetlbfs question than DPDK but I thought I'd
>> start here.
> It's a pleasure to receive new drivers.
> Welcome here :)
> --
> Thomas

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