From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 3F097A318B for ; Fri, 18 Oct 2019 10:18:56 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 168FC1C033; Fri, 18 Oct 2019 10:18:56 +0200 (CEST) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id 2C8A41C02F for ; Fri, 18 Oct 2019 10:18:54 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Oct 2019 01:18:53 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,311,1566889200"; d="scan'208";a="200644701" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga006.jf.intel.com with ESMTP; 18 Oct 2019 01:18:51 -0700 From: Ferruh Yigit To: Bruce Richardson Cc: Andrew Rybchenko , Ciara Power , mtetsuyah@gmail.com, dev@dpdk.org, Thomas Monjalon References: <20191016154606.39218-1-ciara.power@intel.com> <5b6af628-7101-484b-01db-16272025105f@solarflare.com> <04b0cc0a-633f-212e-22ab-147b7f3e6a1a@intel.com> <20191017134341.GA912@bricha3-MOBL.ger.corp.intel.com> <983d5c2f-e287-ccc2-5d7d-0b56e9b2da3a@intel.com> Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [RFC] net/null: add empty promiscuous mode functions X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 10/17/2019 4:33 PM, Ferruh Yigit wrote: > On 10/17/2019 2:43 PM, Bruce Richardson wrote: >> On Thu, Oct 17, 2019 at 12:05:56PM +0100, Ferruh Yigit wrote: >>> On 10/17/2019 11:51 AM, Andrew Rybchenko wrote: >>>> On 10/17/19 1:47 PM, Ferruh Yigit wrote: >>>>> On 10/17/2019 11:37 AM, Andrew Rybchenko wrote: >>>>>> On 10/16/19 9:07 PM, Ferruh Yigit wrote: >>>>>>> On 10/16/2019 4:46 PM, Ciara Power wrote: >>>>>>>> Adding promiscuous functions prevents sample applications failing when run >>>>>>>> on this virtual PMD. The sample applications call promiscuous functions, >>>>>>>> and fail if this function call returns an error, which occurs when the >>>>>>>> virtual PMD does not support the promiscuous function being called. >>>>>>>> >>>>>>>> This change will be implemented for all virtual PMDs that currently do not >>>>>>>> have existing promiscuous functions. Multicast functions will also be >>>>>>>> added for virtual PMDs to prevent sample application breakages here also. >>>>>>> +Andrew >>>>>>> >>>>>>> With the some ethdev APIs returning error code, some sample applications stop >>>>>>> working with virtual interfaces, >>>>>>> >>>>>>> We can, >>>>>>> 1- update sample applications to ignore the errors >>>>>>> 2- Add dummy dev_ops support to (almost all) virtual PMDs (what this RFC suggests) >>>>>>> >>>>>>> (1) puts us back to before the ethdev APIs updated status, and this may be wrong >>>>>>> for the physical devices case, so I am for this RFC. >>>>>>> >>>>>>> Only perhaps we can have some common empty function and keep assigning that one >>>>>>> to reduce the dummy code, what do you think? >>>>>> I don't like the idea to have common empty/dummy functions. >>>>>> If virtual PMD behaves in accordance with enabled promiscuous mode, >>>>>> it should initialize it properly on init: >>>>>>      eth_dev->data->promiscuous = 1; >>>>>> If so, if application requires promiscuous mode, attempt to enable will >>>>>> do nothing. If application requires non-promiscuous mode, disable will >>>>>> fail and it is good. >>>>> It is technically correct that we can't disable promiscuous mode in virtual PMDs >>>>> but I think mainly we don't really care so it returning error may make the >>>>> applications fail/exit unnecessarily with virtual PMDs. >>>> >>>> If I test virtual PMD promiscuous mode, I would prefer enable/disable >>>> callback to say me truth. >>>> >>>> If application really does not care, it should be in the application code. >>> >>> Application can't change this because they may be caring return result for the >>> physical devices. >>> >>> Up until this release these missing dev_ops in virtual PMDs were silently >>> ignored, now APIs are more strict on this (which is good) but to get close the >>> previous behavior for virtual PMDs we need to relax on these features (like >>> saying success on promiscuous disable although it didn't). >>> >> The other variable here is how often an app is going to request promiscuous >> disabling? Given that most ports generally come up in that state anyway, >> and one needs to request enabling it, surely the disable case is relatively >> rare? In that case I'd tend to agree with having disabling it returning >> error for vpmds. >> > > Yes disabling most probably rare, but still it will generate an error and > application is failing because of ring PMD promiscuous disable doesn't look > right to me. > > Perhaps application should differentiate between -ENOTSUP error and operation > fail error, but that looks to me adding unnecessary complexity to the app. > > With a common function shared by all PMDs for both promisc and allmuticast will > add a little code and an easier solution. > btw, initialize promiscuous as enabled at PMD init won't help with current APIs because in API dev_ops check is earlier and will still cause -ENOTSUP. rte_eth_promiscuous_enable RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV); RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->promiscuous_enable, -ENOTSUP); if (dev->data->promiscuous == 0) diag = (*dev->dev_ops->promiscuous_enable)(dev); dev->data->promiscuous = (diag == 0) ? 1 : 0; return