From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 64D14A0096 for <public@inbox.dpdk.org>; Tue, 7 May 2019 12:09:34 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 657E3A49; Tue, 7 May 2019 12:09:33 +0200 (CEST) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id AEB7A239 for <dev@dpdk.org>; Tue, 7 May 2019 12:09:31 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 May 2019 03:09:31 -0700 X-ExtLoop1: 1 Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.36]) ([10.237.221.36]) by fmsmga006.fm.intel.com with ESMTP; 07 May 2019 03:09:29 -0700 To: Andrew Rybchenko <arybchenko@solarflare.com>, Thomas Monjalon <thomas@monjalon.net> Cc: dev@dpdk.org, Wenzhuo Lu <wenzhuo.lu@intel.com>, Jingjing Wu <jingjing.wu@intel.com>, Bernard Iremonger <bernard.iremonger@intel.com>, WenjieX A Li <wenjiex.a.li@intel.com> References: <20190424220309.84270-1-ferruh.yigit@intel.com> <ca3bc407-b025-a2b9-93de-a1e3e86b1f7f@intel.com> <2207858.tCSXyMIbcb@xps> <1873539.KBY3f8jFuF@xps> <34775dd7-e426-7464-02e9-8fa8730c0cfe@solarflare.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/60.6.1 MIME-Version: 1.0 In-Reply-To: <34775dd7-e426-7464-02e9-8fa8730c0cfe@solarflare.com> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] Revert "app/testpmd: set fixed flag for exact link speed" 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> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> Message-ID: <20190507100928.pOyue5JiSaPL-NSHiueAU3HlgisgF9bYynJGpTjyvMw@z> On 5/6/2019 9:09 AM, Andrew Rybchenko wrote: > On 5/4/19 11:45 PM, Thomas Monjalon wrote: >> 02/05/2019 22:27, Thomas Monjalon: >>> 02/05/2019 20:31, Ferruh Yigit: >>>> On 4/29/2019 10:52 AM, Thomas Monjalon wrote: >>>>> 25/04/2019 17:27, Ferruh Yigit: >>>>>> On 4/25/2019 2:29 PM, Thomas Monjalon wrote: >>>>>>> 25/04/2019 13:47, Ferruh Yigit: >>>>>>>> On 4/25/2019 9:19 AM, Thomas Monjalon wrote: >>>>>>>>> 25/04/2019 00:03, Ferruh Yigit: >>>>>>>>>> This reverts commit bdca79053b6aea504d02691d9319fa976062457f. >>>>>>>>>> >>>>>>>>>> Not all PMDs support the fixed link speed set, and link speed can be set >>>>>>>>>> even with auto negotiation enabled. Reverting the patch to not break >>>>>>>>>> existing usage. >>>>>>>>> Which PMDs do not support this flag? >>>>>>>>> Why not fixing the PMDs? >>>>>>>>> >>>>>>>> At least ixgbe and i40e is not supporting setting a fixed speed. >>>>>>>> But I am not sure if this is something to fix, the command in testpmd is to set >>>>>>>> the link speed, what is the problem with setting the link speed without >>>>>>>> disabling the auto-negotiation? >>>>>>> It means it will negotiate with only one speed proposed. >>>>>> Yes. >>>>>> >>>>>>> The real issue is to not support the fixed flag. >>>>>> I don't know if this is a real issue but >>>>>> even it is, is it an issue in the scope of this testpmd command? >>>>>> >>>>>> right now we are first updating the command to set fixed speed flag, and >>>>>> requesting PMDs to fix for it, I am suggesting not to update the command at all. >>>>> I understand. But this change shows a broken behaviour. >>>>> This is the intent of testpmd to show what works or not in PMDs. >>>>> How hard is it to fix the PMDs in your opinion? >>>>> >>>> As far as I can see the the fixed link speed set is not supported in the PMD. >>>> >>>> It may be easy to add perhaps, I don't know, but is it really a "broken >>>> behavior" to not have this support? >>>> What defines that setting speed has to be "fixed speed", if this demand is not >>>> there, should testpmd enforce it? >>> I think a PMD should support both: fixed or not. >>> >>>> In mail thread we have talked that this testpmd command can get an extra >>>> argument to define the speed fixed or not, this can be used to test fixed speed >>>> by who wants to test/use fixed speed. >>>> >>>> I am for reverting this for the release, and adding a new version next release >>>> with fixed speed argument, otherwise testpmd won't be used to set the speed for >>>> some PMDs. >>> OK >> We could have an option in testpmd to test ETH_LINK_SPEED_FIXED. >> >> Revert applied. > > I agree that revert is the best option for the release, but not long term. > > Typical options are (in order): > 1. Auto-negotiation of whatever port supports > 2. Fixed exactly one speed with autoneg disabled > 3. Auto-negotiation with limitations (and it is really the third option which > makes sense if and only if interface allows to specify more than one speed to be > negotiated) > > Right now testpmd supports (1) and (3) with limitation to only one speed to be > negotiated. I think it is wrong. +1 to not leave this revert as it is for long term, what do you think for: 1) Implement 'fixed' link speed support in the missing drivers. 2) Send a new version of the testpmd patch with a "fixed" argument, so that we can support all three above