Re: [dpdk-dev] [PATCH v3 0/2] slow data path communication between DPDK port and Linux

[Panu Matilainen <pmatilai@redhat.com>]

On 03/16/2016 10:19 AM, Ferruh Yigit wrote:
> On 3/16/2016 7:26 AM, Panu Matilainen wrote:
>> On 03/14/2016 05:32 PM, Ferruh Yigit wrote:
>>> On 3/9/2016 11:17 AM, Ferruh Yigit wrote:
>>>> This patch sent to keep record of latest status of the work.
>>>>
>>>>
>>>> This is slow data path communication implementation based on existing KNI.
>>>>
>>>> Difference is: librte_kni converted into a PMD, kdp kernel module is almost
>>>> same except all control path functionality removed and some simplification done.
>>>>
>>>> Motivation is to simplify slow path data communication.
>>>> Now any application can use this new PMD to send/get data to Linux kernel.
>>>>
>>>> PMD supports two communication methods:
>>>>
>>>> 1) KDP kernel module
>>>> PMD initialization functions handles creating virtual interfaces (with help of
>>>> kdp kernel module) and created FIFO. FIFO is used to share data between
>>>> userspace and kernelspace. This is default method.
>>>>
>>>> 2) tun/tap module
>>>> When KDP module is not inserted, PMD creates tap interface and transfers
>>>> packets using tap interface.
>>>>
>>>> In long term this patch intends to replace the KNI and KNI will be
>>>> depreciated.
>>>>
>>>
>>> Self-NACK: Will work on another option that does not introduce new
>>> kernel module.
>>>
>>
>> Hmm, care to elaborate a bit? The second mode of this PMD already was
>> free of external kernel modules. Do you mean you'll be just removing
>> mode 1) from the PMD or looking at something completely different?
>>
>> Just thinking that tun/tap PMD sounds like a useful thing to have, I
>> hope you're not abandoning that.
>>
>
> It will be KNI PMD.
> Plan is to have something like KDP, but with existing KNI kernel module.
> There will be tun/tap support as fallback.

Hum, now I'm confused. I was under the impression everybody hated KNI 
and wanted to get rid of it, and certainly not build future solutions on 
top of it?

	- Panu -

>
> Regards,
> ferruh
>