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 92FCCA00E6 for ; Mon, 2 Sep 2019 11:33:11 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 50F281C21D; Mon, 2 Sep 2019 11:33:11 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 2F1391BE8E for ; Mon, 2 Sep 2019 11:33:09 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Sep 2019 02:33:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,457,1559545200"; d="scan'208";a="176276719" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.4]) ([10.237.221.4]) by orsmga008.jf.intel.com with ESMTP; 02 Sep 2019 02:33:05 -0700 To: Thomas Monjalon , Andrew Rybchenko , Jan Viktorin Cc: Neil Horman , John McNamara , Marko Kovacevic , dev@dpdk.org, Ivan Ilchenko References: <1566915962-5472-2-git-send-email-arybchenko@solarflare.com> <20190828132638.24193266@coaster.localdomain> <1886728.S05C2o22q7@xps> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1886728.S05C2o22q7@xps> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH 01/51] ethdev: change rte_eth_dev_info_get() return value to int 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 8/29/2019 5:56 PM, Thomas Monjalon wrote: > 28/08/2019 16:39, Andrew Rybchenko: >> On 8/28/19 2:26 PM, Jan Viktorin wrote: >>> Andrew Rybchenko wrote: >>>> On 8/28/19 12:51 PM, Jan Viktorin wrote: >>>>> Andrew Rybchenko wrote: >>>>>> From: Ivan Ilchenko >>>>>> + * @return >>>>>> + * - (0) if successful. >>>>>> + * - (-ENOTSUP) if support for dev_infos_get() does not exist >>>>>> for the device. >>>>> I believe that allowing PMDs to return -ENOTSUP is not a good idea. >>>>> At the moment, all PMDs provides this kind of information. It is not >>>>> always very reliable piece of information but for me, it is a piece >>>>> of gold I would not like to loose when configuring devices. >>>>> >>>>> I think it should be mandatory for all PMDs to provide this >>>>> function. Another possible way, give a sane default contents of >>>>> this structure. But, please, do not return -ENOTSUP. >>>> I agree that dev_infos_get() callback should be mandatory, but >>>> what the function should do if the callback is not provided? >>> One way would be to fail to register a PMD without that callback. >>> Such PMD driver would be simply wrong. This is what I mean by saying >>> "mandatory" - the callback MUST be provided. >> >> Typically callbacks are set on probe and >> rte_eth_dev_pci_generic_probe() and similar functions could >> be updated to reject devices with missing dev_infos_get callback. >> However, there is a secondary process cases where dev_infos_get >> is not essential since control path may be unsupported in secondary >> process. >> >> Anyway, I think it is a separate story. >> >>> DPDK could be so nice to provide a default callback named like >>> default_dev_infos_get_when_you_are_incompetent_pmd_author() returning >>> mostly zeros and some always "known metadata" like device pointer, >>> driver_name, ... >> >> Thomas, Ferruh, what do you think? > > I like the idea of making some functions mandatory. > If we need to provide a default callback, why not. > > I'm also thinking we need to better enforce a standardization > of basic features to be implemented. It would make DPDK more mature. > > +1 to make some dev_ops mandatory. At first I can think of: dev_infos_get dev_configure rx_queue_setup tx_queue_setup dev_start dev_stop specific to 'dev_infos_get', it is to get device info, not sure a default callback is good idea for it. And overall agree that 'rte_eth_dev_info_get()' can be documented more/better ...