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 D596DA04F3; Wed, 8 Jan 2020 15:15:39 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id AD8511D423; Wed, 8 Jan 2020 15:15:39 +0100 (CET) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [148.163.129.52]) by dpdk.org (Postfix) with ESMTP id 958DF1D41E for ; Wed, 8 Jan 2020 15:15:38 +0100 (CET) X-Virus-Scanned: Proofpoint Essentials engine Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mx1-us5.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id CC5BD800073; Wed, 8 Jan 2020 14:15:36 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 8 Jan 2020 14:15:30 +0000 To: Ferruh Yigit , Thomas Monjalon , Laurent Hardy , "David Marchand" CC: dev , Olivier Matz 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> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 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<817d82f8-18b4-1f2a-e531-3052fd8c48f3@solarflare.com> Date: Wed, 8 Jan 2020 17:15:27 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <736913fa-3ad9-af6e-c1ad-bc6e72b8059e@intel.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.17.10.39] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1010-25154.003 X-TM-AS-Result: No-9.174900-8.000000-10 X-TMASE-MatchedRID: eVEkOcJu0F7mLzc6AOD8DfHkpkyUphL9wwD0mzFpRrf8kFwgcyoo4UtT Bwyzl/nvDSaZs4ir3xaaCFTKhYGpW/UZjbWnwyrh40jcxy3aXNqpR2kMGcsw7Zm3TxN83Lo4mcA bB2Azfi2n0prrFtI+fW15B2jYXUCGmnXnnL4AEhr9xyC38S1f/fL75LLJV7i34PdcWsl+C/Oahu gKowZiNanctLHiR9ZHk3iaD+Nl6mQWWi1VZOjIHrqImyaR0axZJdbR7brDiw2ZfDRE1uqSgh7tx gU9EMOT9Z0v6YQ2xpSVu+crRThMk2rpKLbabxVmOp/QO0+Wfic4eGohd7gjNsK0HkBcZFjby/TW /EOHPvVlcZgLNBuTrpGTpe1iiCJq71zr0FZRMbBWdFebWIc3VsRB0bsfrpPInxMyeYT53RkUUat F2b2lrly8is41TqtiBIdoxYT98mVC10xlZQkzlAFIATPeqxS40GmDDGUhTV89uwW/OQ9v3px+Ag 58ToOdRjigmQDICPbUNewp4E2/TgSpmVYGQlZ3sxk1kV1Ja8cbbCVMcs1jUlZca9RSYo/b X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--9.174900-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25154.003 X-MDID: 1578492938-v_WvEAoaPijq 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 1/8/20 4:52 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. I think it is a good illustration why deriving the capability from dev_ops pointer is not that good idea. >> 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. I hope it was just an idea to copy dev_ops and adjust in accordance with the device capabilities on register. I.e. not fully dynamic changes in runtime.