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 2DDFAA2F6B for ; Tue, 8 Oct 2019 16:18:37 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 60D7C1BFAA; Tue, 8 Oct 2019 16:18:36 +0200 (CEST) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 4ECBF1BF9D; Tue, 8 Oct 2019 16:18:34 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Oct 2019 07:18:33 -0700 X-IronPort-AV: E=Sophos;i="5.67,270,1566889200"; d="scan'208";a="206646437" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/AES256-SHA; 08 Oct 2019 07:18:32 -0700 To: Matan Azrad , Ferruh Yigit , 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: "Yigit, Ferruh" Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@linux.intel.com; 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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 7/31/2019 7:11 AM, Matan Azrad wrote: > Hi Ferruh > > From: Ferruh Yigit >> 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? > > Scatter is a defined RX offload. > Like other offloads I think it always should be explicitly set by the user if he wants it, and vice versa. > If the user doesn't configure it, the PMD should not scatter packets because the user doesn't expect multi-mbuf packets in datapath and maybe even doesn't handle it. +1 So what about having the log message but not implicitly update the offload config? > > So, I think the above case is a user conflict in Rx configuration and like other conflicts it should cause an error. > In MLX5 PMD, an error will be returned from Rx setup. > >