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 08:19:44 +0000
Message-ID: <56E91720.5070607@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>
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 mga03.intel.com (mga03.intel.com [134.134.136.65])
 by dpdk.org (Postfix) with ESMTP id 0A3E52934
 for <dev@dpdk.org>; Wed, 16 Mar 2016 09:19:47 +0100 (CET)
In-Reply-To: <56E90A9F.4020608@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 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 simplific=
ation done.
>>>
>>> Motivation is to simplify slow path data communication.
>>> Now any application can use this new PMD to send/get data to Linux ke=
rnel.
>>>
>>> PMD supports two communication methods:
>>>
>>> 1) KDP kernel module
>>> PMD initialization functions handles creating virtual interfaces (wit=
h help of
>>> kdp kernel module) and created FIFO. FIFO is used to share data betwe=
en
>>> userspace and kernelspace. This is default method.
>>>
>>> 2) tun/tap module
>>> When KDP module is not inserted, PMD creates tap interface and transf=
ers
>>> 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.
>>
>=20
> Hmm, care to elaborate a bit? The second mode of this PMD already was=20
> free of external kernel modules. Do you mean you'll be just removing=20
> mode 1) from the PMD or looking at something completely different?
>=20
> Just thinking that tun/tap PMD sounds like a useful thing to have, I=20
> hope you're not abandoning that.
>=20

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