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 9F554A0613 for ; Tue, 30 Jul 2019 20:55:55 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 11ACD1BFDC; Tue, 30 Jul 2019 20:55:55 +0200 (CEST) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 101271BFDB; Tue, 30 Jul 2019 20:55:52 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Jul 2019 11:55:52 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,327,1559545200"; d="scan'208";a="162728759" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga007.jf.intel.com with ESMTP; 30 Jul 2019 11:55:50 -0700 To: Matan Azrad , Wenzhuo Lu , Jingjing Wu Cc: "dev@dpdk.org" , "stable@dpdk.org" References: <1564403817-13438-1-git-send-email-matan@mellanox.com> <4d4ec2e2-0fe4-0901-76c6-28d17d80cbc8@intel.com> <93e46254-6d07-83d6-5999-04f9b0309dfd@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH 1/2] app/testpmd: fix scatter offload configuration 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 7/30/2019 7:34 PM, Matan Azrad wrote: > > > From: Ferruh Yigit >> On 7/30/2019 4:56 PM, Matan Azrad wrote: >>> Hi Ferruh >>> >>> From: Ferruh Yigit >>>> Sent: Tuesday, July 30, 2019 6:22 PM >>>> To: Matan Azrad ; Wenzhuo Lu >>>> ; Jingjing Wu >>>> Cc: dev@dpdk.org; stable@dpdk.org >>>> Subject: Re: [dpdk-dev] [PATCH 1/2] app/testpmd: fix scatter offload >>>> configuration >>>> >>>> On 7/30/2019 2:17 PM, Matan Azrad wrote: >>>>> Hi Ferruh >>>>> >>>>> From: Ferruh Yigit >>>>>> Sent: Tuesday, July 30, 2019 4:09 PM >>>>>> To: Matan Azrad ; Wenzhuo Lu >>>>>> ; Jingjing Wu >>>>>> Cc: dev@dpdk.org; stable@dpdk.org >>>>>> Subject: Re: [dpdk-dev] [PATCH 1/2] app/testpmd: fix scatter >>>>>> offload configuration >>>>>> >>>>>> On 7/29/2019 1:36 PM, Matan Azrad wrote: >>>>>>> When the mbuf data size cannot contain the maximum Rx packet >>>>>>> length with the mbuf headroom, a packet should be scattered in >>>>>>> more than one >>>>>> mbuf. >>>>>>> >>>>>>> The application did not configure scatter offload in the above case. >>>>>>> >>>>>>> Enable the Rx scatter offload in the above case. >>>>>>> >>>>>>> Fixes: 33f9630fc23d ("app/testpmd: create mbuf based on max >>>>>>> supported >>>>>>> segments") >>>>>>> Cc: stable@dpdk.org >>>>>>> >>>>>>> Signed-off-by: Matan Azrad >>>>>> >>>>>> Deferring the patchset to next release, they were late anyway and >>>>>> not actually fixing a defect, safer to defer than getting them in rc3. >>>>> >>>>> Yes this patch came late for RC3 but it is a fix. >>>>> >>>>> What are you concerns here? >>>>> Why don't you think defect found? >>>> >>>> First patch changes the behavior, when mbuf size is larger than >>>> configured size and user didn't provided the scatter offload, should >>>> test application automatically enable it? >>> >>> No, only when the mbuf size is smaller than the max_rx_pkt_len with >> headroom. >>> If scatter is not enabled in the above case, how can the PMD provide a >> packet with max_rx_pkt_len size? >>> > > Answer here? Is it because drivers also "automatically" enable scattered Rx based on other values? - which is also open to discussion I think. > >>> I think not enabling scatter in this case it is a user conflict in configuration >> and should raise an error in the PMD. Maybe even in ethdev layer. >>> >>>> It may or not, but this is the change of the behavior, I think not a >>>> fix. >>>> >>>> And second patch adds more detail into the statistics, so I believe >>>> it is clear that it is not a fix. >>> >>> Agree, this can wait. >>> >>>> The concern is getting changes very close to release, to balance >>>> between risk and benefit of the feature. I don't see any reason why >>>> these changes can't wait next release, so I don't see any reason to get the >> risk. >>> >>> When I changed the default max_rx_pkt_len and mbuf size in LRO testing I >> met this issue. >>> >>> By default scatter will not be enabled. >> >> I think it is still arguable if scatter should be enabled by default, > > I meant that with this patch it will not be enabled by default due to the default values of mbuf size and max_rx_pkt_len. I mean the same thing indeed, still I believe arguable. > >> but isn't there a way in testpmd to enable scatter explicitly? If so you have a way to test LRO. > > Yes there is a way. > > This patch is just the right way to do it. > Good to know it is not blocking anyone, patch can be reviewed by its maintainers and discussed more.