From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id E0F5E2E81 for ; Wed, 16 Mar 2016 11:26:50 +0100 (CET) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 16 Mar 2016 03:26:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,344,1455004800"; d="scan'208";a="935003404" Received: from tzmudzin-mobl2.ger.corp.intel.com (HELO [10.252.25.73]) ([10.252.25.73]) by orsmga002.jf.intel.com with ESMTP; 16 Mar 2016 03:26:46 -0700 To: Panu Matilainen , dev@dpdk.org 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> Cc: David Marchand , Helin Zhang From: Ferruh Yigit Message-ID: <56E934E5.4080905@intel.com> Date: Wed, 16 Mar 2016 10:26:45 +0000 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <56E917AD.2060701@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v3 0/2] slow data path communication between DPDK port and Linux X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Mar 2016 10:26:51 -0000 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 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? > 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