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 BA31DA04F3; Wed, 8 Jan 2020 15:09:14 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 8AC9D1C1E1; Wed, 8 Jan 2020 15:09:14 +0100 (CET) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 3719D1C0DA for ; Wed, 8 Jan 2020 15:09:12 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jan 2020 06:08:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,410,1571727600"; d="scan'208";a="215961697" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.35]) ([10.237.221.35]) by orsmga008.jf.intel.com with ESMTP; 08 Jan 2020 06:08:53 -0800 To: Olivier Matz Cc: David Marchand , Laurent Hardy , dev , Thomas Monjalon , Andrew Rybchenko References: <20200107145637.8922-1-laurent.hardy@6wind.com> <2b1389a4-98ec-49cc-b2d0-2e38690fcf4b@intel.com> <20200108094234.GB22738@platinum> <80003197-42da-23ee-d96d-f0e5d9cecb27@intel.com> <20200108122730.GC22738@platinum> From: Ferruh Yigit 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] [PATCH] librte_ethdev: extend dpdk api led control to query capability 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 1/8/2020 12:27 PM, Olivier Matz wrote: > On Wed, Jan 08, 2020 at 12:12:11PM +0000, Ferruh Yigit wrote: >> On 1/8/2020 9:42 AM, Olivier Matz wrote: >>> On Wed, Jan 08, 2020 at 09:09:29AM +0000, Ferruh Yigit wrote: >>>> On 1/8/2020 8:56 AM, David Marchand wrote: >>>>> Hello Laurent, >>>>> >>>>> Bonne année. >>>>> >>>>> Cc: maintainers. >>>>> >>>>> On Tue, Jan 7, 2020 at 3:57 PM Laurent Hardy wrote: >>>>>> >>>>>> In current led control API we have no way to know if a device is able >>>>>> to handle on/off requests coming from the application. >>>>>> Knowing if the device is led control capable could be useful to avoid >>>>>> exchanges between application and kernel. >>>>>> Using the on/off requests to flag if the device is led control capable >>>>>> (based on the ENOSUP returned error) is not convenient as such request >>>>>> can change the led state on device. >>>>>> >>>>>> This patch adds a new function rte_eth_led_ctrl_capable() that will look >>>>>> for led_off/on dev ops availability on the related pmd, to know if the >>>>>> device is able to handle such led control requests (on/off). >>>>> >>>>> This patch breaks the ABI, which is BAD :-). >>>> >>>> Why it is an ABI break, dev_ops should be between library and drivers, so it >>>> should be out of the ABI concern, isn't it. >>>> >>>>> This new api only needs to look at the existing ops, so you can remove >>>>> the (unused in your patch) dev_led_ctrl_capable ops. >>>>> >>>>> OTOH, would it make sense to expose this capability in dev_flags? >>>>> >>>> >>>> 'rte_eth_led_on()' & 'rte_eth_led_off()' APIs returns '-ENOTSUP' when the not >>>> supported, can that help application to understand? >>> >>> In our case, it is not possible to use rte_eth_led_on/off() to check if >>> the feature is supported: on success, it would change the value of the >>> led, and it seems it is not recoverable on some drivers. >> >> What does it mean it is not recoverable, like can you turn on the led but can't >> turn off it back? Can't this be fixed in the PMD? > > In the case there is only one LED, which is by default used to display > the link status, it can never display the status again without resetting > the device. Is there a specific PMD are we talking about? > > Maybe an alternative solution would be to add a function, in addition to > on() and off(): > > led_ctrl_status_link() to display the status link on the led. > > >> >>> >>> Today it is not possible to know if the feature is available without >>> side effect. >>> >>