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

[Panu Matilainen <pmatilai@redhat.com>]

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.

	- Panu -