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 4D10FA0487 for ; Tue, 2 Jul 2019 17:58:27 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 54C8E1B9D4; Tue, 2 Jul 2019 17:58:26 +0200 (CEST) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id A35491B9C7 for ; Tue, 2 Jul 2019 17:58:24 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jul 2019 08:58:23 -0700 X-IronPort-AV: E=Sophos;i="5.63,443,1557212400"; d="scan'208";a="315282983" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.30]) ([10.237.221.30]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/AES256-SHA; 02 Jul 2019 08:58:21 -0700 To: Nithin Dabilpuram , Thomas Monjalon Cc: dev@dpdk.org, Wenzhuo Lu , Jingjing Wu , Bernard Iremonger , ndabilpuram@marvell.com, jerinj@marvell.com References: <20190513112112.7069-1-ndabilpuram@marvell.com> <1750613.yctpDDeXOX@xps> <20190517085547.GA26094@gmail.com> <3849744.ELThORf4eq@xps> <20190520125053.GA1399@gmail.com> <20190529081620.GA5044@gmail.com> From: "Yigit, Ferruh" Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@linux.intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190529081620.GA5044@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] app/testpmd: change port detach interface 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 5/29/2019 9:16 AM, Nithin Dabilpuram wrote: > Hi Thomas, > > On Mon, May 20, 2019 at 06:20:53PM +0530, Nithin Dabilpuram wrote: >> On Fri, May 17, 2019 at 10:59:38AM +0200, Thomas Monjalon wrote: >>> 17/05/2019 10:55, Nithin Dabilpuram: >>>> On Wed, May 15, 2019 at 09:27:22AM +0200, Thomas Monjalon wrote: >>>>> 15/05/2019 08:52, Nithin Dabilpuram: >>>>>> Hi Thomas, >>>>>> On Tue, May 14, 2019 at 05:39:30PM +0200, Thomas Monjalon wrote: >>>>>>> Hi, >>>>>>> >>>>>>> 13/05/2019 13:21, Nithin Dabilpuram: >>>>>>>> With the latest published interface of >>>>>>>> rte_eal_hotplug_[add,remove](), and rte_eth_dev_close(), >>>>>>>> rte_eth_dev_close() would cleanup all the data structures of >>>>>>>> port's eth dev leaving the device common resource intact >>>>>>>> if RTE_ETH_DEV_CLOSE_REMOVE is set in dev flags. >>>>>>>> So "port detach" (~hotplug remove) should be able to work, >>>>>>>> with device identifier like "port attach" as eth_dev could have >>>>>>>> been closed already and rte_eth_devices[port_id] reused. >>>>>>> >>>>>>> "port attach" uses devargs as identifier because there >>>>>>> is no port id before creating it. But "detach port" uses >>>>>>> logically the port id to close. >>>>>> >>>>>> But if "port close" was already called on that port, >>>>>> eth_dev->state would be set as RTE_ETH_DEV_UNUSED and >>>>>> that port id could be reused. >>>>>> So after "port close" if we call "port detach", isn't it >>>>>> incorrect to use the same port id ? >>>>> >>>>> Yes it is incorrect to close a port which is already closed :) >>>>> >>>>>>>> This change alters "port detach" cmdline interface to >>>>>>>> work with device identifier like "port attach". >>>>>>> >>>>>>> The word "port" means an ethdev port, so it should be >>>>>>> referenced with a port id. >>>>>>> If you want to close an EAL rte_device, then you should >>>>>>> rename the command. >>>>>>> But testpmd purpose should be to work with ethdev ports only. >>>>>> >>>>>> Renaming the command to "detach " ? >>>>> >>>>> Yes something like that. >>>>> But why do you want to manage rte_device in testpmd? >>>>> Being able to close ports in not enough? >>>>> Please describe a scenario. >>>>> >>>> >>>> We just want to support testing hotplug detach along with >>>> hotplug attach from testpmd. Currently there is no way to detach >>>> if we close the port first. >>> >>> OK >> So can I send next revision with command renamed to "detach " ? > > Any info on this ? I can even add it as another cmd without disturbing existing > command if needed. This sounds better option to me. I see the need to remove device via 'identifier' but also still it is easier to use 'port_id' for removal when applicable, so I am for keeping it. What do you think adding a new command: 'device detach' Also testpmd doesn't dead with 'device' much, it mainly works in port level, because of this does it make sense to add another command something like: "show device info all" > >>> >>>> Another reason is that in our new PMD, for detaching one specific port, >>>> we need more than one try as the PMD might return -EAGAIN. >>>> So with the current "port detach" implementation, after closing the port, >>>> if PMD returns -EAGAIN for rte_dev_remove() call, there is no way to >>>> try it again. >>> >>> This is a bug. >>> Should we catch -EAGAIN somewhere? >> >> It is already caught in local_dev_remove() and >> rte_dev_remove() fails. Only problem as I said below is >> in testpmd if first call to detach_port_device() i.e handler of "port detach", >> rte_dev_remove() returns -EAGAIN and PMD cleaned up the resources partially like eth_dev >> resources, the second time call cannot work port_id will not be valid anymore. >> >>> >>>