From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <ferruh.yigit@intel.com> Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id D96231B57C for <dev@dpdk.org>; Tue, 18 Dec 2018 19:10:30 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Dec 2018 10:10:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,368,1539673200"; d="scan'208";a="111591740" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga003.jf.intel.com with ESMTP; 18 Dec 2018 10:10:28 -0800 To: Igor Ryzhov <iryzhov@nfware.com>, Stephen Hemminger <stephen@networkplumber.org> Cc: dev@dpdk.org References: <20181130192946.13732-1-iryzhov@nfware.com> <20181130194750.13870-1-iryzhov@nfware.com> <20181130153815.3be2f30b@xeon-e3> <CAF+s_FxmjbisjuESsn-7+_cMm+19PUrBhNz-4nFUoGJR-iPaRg@mail.gmail.com> From: Ferruh Yigit <ferruh.yigit@intel.com> Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: <CAF+s_FxmjbisjuESsn-7+_cMm+19PUrBhNz-4nFUoGJR-iPaRg@mail.gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2] kni: use kni_ethtool_ops only with unknown drivers X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Tue, 18 Dec 2018 18:10:31 -0000 On 12/1/2018 11:12 AM, Igor Ryzhov wrote: > Hi Stephen, > > I also do not see the point of the current implementation of ethtool > support. > That's why I sent this patch – it enables ethtool_ops for all devices, > independent of the underlying driver. I tried to clarify this in the patch, but it doesn't enable ethtool_ops for underlying driver. > Right now only .get_link is supported, but I am thinking about > implementation of a larger set of functions, using req/resp queue, like > netdev_ops functions are working. You should go to userspace to get device information, right. Since now userspace has the driver. So a channel between kernel and userspace is required. Please share your plans/design on this support. > > Regarding the KNI itself, we use it as Linux mirror of physical port for: > 1. Port configuration from Linux – such functions as set_mac, change_mtu, > etc. And ethtool_ops will be used the same way. > 2. Passing control-plane packets to Linux. > > Can virtio user be used the same way, as a mirror of physical port? > > Best regards, > Igor > > On Sat, Dec 1, 2018 at 2:38 AM Stephen Hemminger <stephen@networkplumber.org> > wrote: > >> On Fri, 30 Nov 2018 22:47:50 +0300 >> Igor Ryzhov <iryzhov@nfware.com> wrote: >> >>> Current implementation of kni_ethtool_ops just uses corresponding >>> ethtool_ops function of underlying driver for all functions except for >>> .get_link. This commit sets kni->net_dev->ethtool_ops directly to the >>> ethtool_ops of the corresponding driver. >>> >>> For unknown drivers (all but ixgbe and i40e) we still use >>> kni_ethtool_ops with implemented .get_link function. >>> >>> Signed-off-by: Igor Ryzhov <iryzhov@nfware.com> >> >> Why does KNI still support ethtool which: >> 1. Only works on a subset of devices >> 2. Requires a 3rd implmentation of the HW device (Linux, DPDK, and KNI) >> >> Then again why does KNI exist at all? What is missing from virtio user >> which >> is faster anyway. >>