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 A0C1CA0613 for ; Tue, 30 Jul 2019 19:28:24 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 66EBB1BFDD; Tue, 30 Jul 2019 19:28:24 +0200 (CEST) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id 63EDA1BF03; Tue, 30 Jul 2019 19:28:22 +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 orsmga101.jf.intel.com with ESMTP; 30 Jul 2019 10:28:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,327,1559545200"; d="scan'208";a="162651060" 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 10:28:19 -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] [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 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? > > 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, but isn't there a way in testpmd to enable scatter explicitly? If so you have a way to test LRO. > > >>> What's about RC4? >> >> No, it is even worse, there will be only a little testing after rc4 and a little time >> before release. > > So, I hope it will be integrated in RC3. >