From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ferruh Yigit <ferruh.yigit@intel.com>
Subject: Re: [PATCH v3 0/2] slow data path communication between
 DPDK port and Linux
Date: Wed, 16 Mar 2016 10:26:45 +0000
Message-ID: <56E934E5.4080905@intel.com>
References: <1455858349-14639-1-git-send-email-ferruh.yigit@intel.com>
 <1457522269-2198-1-git-send-email-ferruh.yigit@intel.com>
 <56E6D9A4.4090705@intel.com> <56E90A9F.4020608@redhat.com>
 <56E91720.5070607@intel.com> <56E917AD.2060701@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: David Marchand <david.marchand@6wind.com>,
 Helin Zhang <helin.zhang@intel.com>
To: Panu Matilainen <pmatilai@redhat.com>, dev@dpdk.org
Return-path: <dev-bounces@dpdk.org>
Received: from mga02.intel.com (mga02.intel.com [134.134.136.20])
 by dpdk.org (Postfix) with ESMTP id E0F5E2E81
 for <dev@dpdk.org>; Wed, 16 Mar 2016 11:26:50 +0100 (CET)
In-Reply-To: <56E917AD.2060701@redhat.com>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

On 3/16/2016 8:22 AM, Panu Matilainen wrote:
> 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 existi=
ng KNI.
>>>>>
>>>>> Difference is: librte_kni converted into a PMD, kdp kernel module i=
s almost
>>>>> same except all control path functionality removed and some simplif=
ication 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 (w=
ith help of
>>>>> kdp kernel module) and created FIFO. FIFO is used to share data bet=
ween
>>>>> userspace and kernelspace. This is default method.
>>>>>
>>>>> 2) tun/tap module
>>>>> When KDP module is not inserted, PMD creates tap interface and tran=
sfers
>>>>> 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 modul=
e.
>> There will be tun/tap support as fallback.
>=20
> Hum, now I'm confused. I was under the impression everybody hated KNI=20
> and wanted to get rid of it, and certainly not build future solutions o=
n=20
> top of it?
>=20

We can't remove it.
We can't replace/improve it -you were one of the major opposition to this=
.
This doesn't leave more option other than using it.

There won't be any update in KNI kernel module, library + sample app
will be converted into PMD.

Regards,
ferruh