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 E1303A00BE; Fri, 1 Nov 2019 12:12:00 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 3F73C1C0AF; Fri, 1 Nov 2019 12:12:00 +0100 (CET) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id B84A41BFCF for ; Fri, 1 Nov 2019 12:11:58 +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-us3.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 6B628B8005D; Fri, 1 Nov 2019 11:11:55 +0000 (UTC) Received: from [192.168.38.17] (91.220.146.112) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 1 Nov 2019 11:11:36 +0000 To: Pavan Nikhilesh Bhagavatula , Thomas Monjalon CC: "dev@dpdk.org" , "ferruh.yigit@intel.com" , Jerin Jacob Kollanukkaran , Ajit Khaparde , Somnath Kotur , Rahul Lakkireddy , Hemant Agrawal , Sachin Saxena , Wenzhuo Lu , John Daley , Hyong Youb Kim , Qi Zhang , Xiao Wang , Ziyang Xuan , Xiaoyun Wang , Guoyang Zhou , Beilei Xing , Jingjing Wu , Qiming Yang , Konstantin Ananyev , Shijith Thotton , Srisivasubramanian Srinivasan , Matan Azrad , Shahaf Shuler , Viacheslav Ovsiienko , Stephen Hemminger , "K. Y. Srinivasan" , Haiyang Zhang , Alejandro Lucero , Nithin Kumar Dabilpuram , Kiran Kumar Kokkilagadda , Rasesh Mody , Shahed Shaikh , Maciej Czekaj , Yong Wang References: <20191029050312.2715-1-pbhagavatula@marvell.com> <20191029153722.4547-1-pbhagavatula@marvell.com> <20191029153722.4547-5-pbhagavatula@marvell.com> <3550547.JxZvSsHgut@xps> From: Andrew Rybchenko Openpgp: preference=signencrypt 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 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4VPLn5aAcfbCXJnE3IGCp/hPl50iQqu7BPOYBbWXeb9ptDjGCAThNxSz0WAXkmcjAFE8gdE6 Znk9 Message-ID: Date: Fri, 1 Nov 2019 14:11:31 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Originating-IP: [91.220.146.112] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1010-25014.003 X-TM-AS-Result: No-4.687100-8.000000-10 X-TMASE-MatchedRID: QfHZjzml1E8eimh1YYHcKKfOxh7hvX7169aS+7/zbj+qvcIF1TcLYNWb zJ0Wt0DyxvpvaJ8eZVH7HT4rXdTTadfVs8nbuCNXLbjXqdzdtCUEa8g1x8eqF5msEmhWfxY0NJ3 /6jNv2j8RHYGcw9JlZrSM+U9L0JTKzm6eS8/rkR5/OBWacv+iVUyEf8qljHK7h/Zinvfjw34wfX HHXt4W1G9Lm9B23jlV+Ka9BY0npTzqt0pXmGxEIMXfQl57nu/GayR1WHmJYoqbKItl61J/ycnjL TA/UDoAoTCA5Efyn8DyABN92SNtPN0H8LFZNFG76sBnwpOylLP9RMRYHfwhCluK1hPlOc5snUL+ prpBp8njmDPUKBIZeT9ufrwE/IBOqU56te7g59bQcmB5AcIXwINac/KTszxKW4OP07Z2dP2igEH y7J4S6ylkreA5r24aYnCi5itk3iprD5+Qup1qU37cGd19dSFd X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--4.687100-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25014.003 X-MDID: 1572606716-nyWKelpEU5Kj Subject: Re: [dpdk-dev] [PATCH v15 4/7] drivers/net: update Rx RSS hash offload capabilities 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 10/31/19 7:51 PM, Pavan Nikhilesh Bhagavatula wrote: > >> 29/10/2019 16:37, pbhagavatula@marvell.com: >>> From: Pavan Nikhilesh >>> >>> Add DEV_RX_OFFLOAD_RSS_HASH flag for all PMDs that support RSS hash delivery. >>> >>> Signed-off-by: Pavan Nikhilesh >>> Reviewed-by: Andrew Rybchenko >>> Reviewed-by: Hemant Agrawal >>> Acked-by: Jerin Jacob >>> Acked-by: Ajit Khaparde >>> --- >>> + if (!(dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_RSS_HASH)) >>> + dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_RSS_HASH; >> >> Excuse me, I miss why you need a check before setting the bit. > > Currently, none of the PMDs support disabling RSS_HASH (except octeontx2) since it involves > adding an if check in Rx routine that might lead to perf impact. > So, we are implicitly enabling the offload for all the PMDs if an application decides to disable > RSS_HASH. In future if PMD maintainer decides to add this feature she/he can remove the check. As I understand Thomas says that it is just sufficient to do: dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_RSS_HASH; without any if before. Yes, it is true since right now it looks a bit strange. I guess it is the result of code evolution. Initially it was logging inside if, but logging is moved to ethdev. (Of course, it is true for such trivial checks only)