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 824D5A04F3; Wed, 8 Jan 2020 14:52:19 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id B89161D9FA; Wed, 8 Jan 2020 14:52:18 +0100 (CET) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 3B5CF1D9F7 for ; Wed, 8 Jan 2020 14:52:16 +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 fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jan 2020 05:52:15 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,410,1571727600"; d="scan'208";a="215956296" 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 05:52:14 -0800 To: Thomas Monjalon , Laurent Hardy , David Marchand Cc: dev , Olivier Matz , Andrew Rybchenko References: <20200107145637.8922-1-laurent.hardy@6wind.com> <1825898.usQuhbGJ8B@xps> <9ae94152-5be3-5356-94e6-a432fc3c02cb@intel.com> <3997232.ejJDZkT8p0@xps> 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 1:25 PM, Thomas Monjalon wrote: > 08/01/2020 14:20, Ferruh Yigit: >> On 1/8/2020 1:06 PM, Thomas Monjalon wrote: >>> 08/01/2020 13:59, Ferruh Yigit: >>>> But for dev_ops, instead of having another capabilities indicator, which >>>> requires PMDs to keep this synchronized, I think it is better if we can self >>>> contain this information within dev_ops, like not implementing dev_ops would >>>> mean it is not supported, this way it is easier to maintain and less error prone. >>> >>> It means the dev_ops is resetted at init if a device does not support the feature. >>> It is against having const dev_ops. >> >> I didn't get your comment. >> For example getting FW version, I am saying instead of keeping another piece of >> information to say if it is supported by device/driver, better to grasp this >> from if the driver implemented 'fw_version_get' dev_ops or not. > > I like this approach. > Capabilities should be expressed by setting the function pointer or not (NULL). > But a driver may support a feature for a subset of devices. In that case dev_ops itself can return the '-ENOTSUP', since application interaction will be through the ethdev API, either API send '-ENOTSUP' because the dev_ops is NULL or dev_ops itself send the '-ENOTSUP' because of the underlying version of the device, for application it will be clear that that feature is not supported. > If a device does not support a feature, the function pointer must be set to NULL. > The only issue is having dev_ops as a const struct. Not sure about changing the dev_ops on runtime, it can be very hard to debug.