From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id F37CA27D for ; Tue, 24 Apr 2018 12:39:34 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Apr 2018 03:39:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,322,1520924400"; d="scan'208";a="53207884" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.42]) ([10.237.221.42]) by orsmga002.jf.intel.com with ESMTP; 24 Apr 2018 03:39:26 -0700 To: Thomas Monjalon , dev@dpdk.org Cc: Ajit Khaparde , Jerin Jacob , Shijith Thotton , Santosh Shukla , Rahul Lakkireddy , John Daley , Wenzhuo Lu , Konstantin Ananyev , Beilei Xing , Qi Zhang , Jingjing Wu , Adrien Mazarguil , Nelio Laranjeiro , Yongseok Koh , Shahaf Shuler , Tomasz Duszynski , Jianbo Liu , Alejandro Lucero , Hemant Agrawal , Shreyansh Jain , Harish Patil , Rasesh Mody , Andrew Rybchenko , Shrikrishna Khare , Maxime Coquelin , Allain Legacy , Bruce Richardson , Gaetan Rivet , Olivier Matz References: <2759953.P7QpFFSjiU@xps> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <2759953.P7QpFFSjiU@xps> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] Survey for final decision about per-port offload API 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: , X-List-Received-Date: Tue, 24 Apr 2018 10:39:35 -0000 On 3/30/2018 2:47 PM, Thomas Monjalon wrote: > There are some discussions about a specific part of the offload API: > "To enable per-port offload, the offload should be set on both > device configuration and queue setup." > > It means the application must repeat the port offload flags > in rte_eth_conf.[rt]xmode.offloads and rte_eth_[rt]xconf.offloads, > when calling respectively rte_eth_dev_configure() and > rte_eth_[rt]x_queue_setup for each queue. > > The PMD must check if there is mismatch, i.e. a port offload not > repeated in queue setup. > There is a proposal to do this check at ethdev level: > http://dpdk.org/ml/archives/dev/2018-March/094023.html > > It was also proposed to relax the API and allow "forgetting" port > offloads in queue offloads: > http://dpdk.org/ml/archives/dev/2018-March/092978.html > > It would mean the offloads applied to a queue result of OR operation: > rte_eth_conf.[rt]xmode.offloads | rte_eth_[rt]xconf.offloads > > 1/ Do you agree with above API change? There is a detail of ability to disabling queue level offloads in queue_setup() function, I want to discuss here. Prolog: port level offload: An offload only can be applied port level, to all queues. queue level offload: An offload can be applied into individual queues of the port PMD reports port offload capability: port level offload + queue level offload PMD reports queue offload capability: queue level offload Above suggested change to API: - Application will be limited in configure() to set only an offload within "port offload capability" - Application will be limited in queue_setup() to set only an offload within "queue offload capability" This doesn't say much about disabling an offload in queue_setup(), as a rule: - An "port level offload" can't be disabled in queue_setup() There are two cases of disable: 1- Disabling a "queue level offload" enabled queue_setup() previously 2- Disabling a "queue level offload" enabled in configure() If second is not supported, to disable the offload, applications should stop->re-configure()->re-queue_setup()->start the port. But having this capability makes the offloading parameters more confusing for applications. I suggest adding disable support to fist one but not second one. According this, application: - In configure() set offload within "port offload capability" - In queue_setup() set offload within "queue offload capability". Offloads are incremental to ones in configure() PMDs: - In configure() verify the offload against "port offload capability" - In queue_setup() verify the offload against "queue offload capability" - In queue_setup() if requested offload is not enabled already, enable it for queue - In queue_setup() if an offload value cleared in requested offload that is set in port_offload, return error. - In queue_setup() if an offload value cleared in requested offload that is not set in port_offload but set in queue_offload, disable it for that queue. Samples according initial suggestion + disable support: Sample 1: port level offload: A, B queue level offload: C, D port offload capability: A, B, C, D queue offload capability: C, D configure(A,C): Q1:A,C Q2:A,C [queue_setup() can't disable A,C after this] queue_setup(Q1, B): --> Error [Can't enable port level offload in queue_setup()] queue_setup(Q1, D): Q1:A,C,D queue_setup(Q1, ""): Q1:A,C [Disabled D] queue_setup(Q2, "C,D"): Q2:A,C,D queue_setup(Q2, ""): Q2:A,C queue_setup(Q2, A): --> Error [A is port_level offload] Sample 2: port level offload: A, B, C queue level offload: "" port offload capability: A, B, C queue offload capability: "" [no way to change offloads in queue level] configure(A,C): Q1:A,C Q2:A,C queue_setup(Q1, B): --> Error queue_setup(Q1, A): --> Error queue_setup(Q2, ""): Q2:A,C queue_setup(Q1, ""): Q1:A,C Sample 3: port level offload: "" queue level offload: A, B, C, D port offload capability: A, B, C, D queue offload capability: A, B, C, D configure(A): Q1:A Q2:A queue_setup(Q1, A): Q1:A queue_setup(Q1, ""): Q1:A queue_setup(Q1, A,B,C,D): Q1:A,B,C,D queue_setup(Q1, B): Q1:A,B [Disable C,D] queue_setup(Q2, C): Q2:A,C queue_setup(Q1, ""): Q1:A [Disable B] queue_setup(Q2, ""): Q2:A [Disable C]