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

[Ferruh Yigit <ferruh.yigit@intel.com>]

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.

Regards,
ferruh