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 36C5FA04F3; Wed, 8 Jan 2020 15:01:12 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 6E6891DA0E; Wed, 8 Jan 2020 15:01:11 +0100 (CET) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 7168C1DA0D for ; Wed, 8 Jan 2020 15:01:09 +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 orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jan 2020 06:01:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,410,1571727600"; d="scan'208";a="215958848" 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 06:01:06 -0800 From: Ferruh Yigit 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> <736913fa-3ad9-af6e-c1ad-bc6e72b8059e@intel.com> 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 1:52 PM, Ferruh Yigit wrote: > 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. For this specific problem, What do you think having: rte_eth_led_on_is_supported() rte_eth_led_off_is_supported() like: rte_eth_led_on_is_supported() { RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV); RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_led_on, -ENOTSUP); return 0; } rte_eth_led_on() { ret = rte_eth_led_on_is_supported(); if (ret) return ret; return eth_err(port_id, (*dev->dev_ops->dev_led_on)(dev)); } > >> 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. >