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 8F752A04AB; Mon, 31 Aug 2020 08:35:35 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 64AC11C05C; Mon, 31 Aug 2020 08:35:35 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id 5772FA3 for ; Mon, 31 Aug 2020 08:35:33 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.150]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id EF53B2004D; Mon, 31 Aug 2020 06:35:32 +0000 (UTC) Received: from us4-mdac16-28.at1.mdlocal (unknown [10.110.49.210]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id ED6E6800A3; Mon, 31 Aug 2020 06:35:32 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.49.106]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 8508310004F; Mon, 31 Aug 2020 06:35:32 +0000 (UTC) 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-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id DE131B40068; Mon, 31 Aug 2020 06:35:31 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 31 Aug 2020 07:35:22 +0100 To: Stephen Hemminger CC: Slava Ovsiienko , "dev@dpdk.org" , Matan Azrad , Raslan Darawsheh , Thomas Monjalon , "ferruh.yigit@intel.com" , "jerinjacobk@gmail.com" , "ajit.khaparde@broadcom.com" , "maxime.coquelin@redhat.com" , "olivier.matz@6wind.com" , "david.marchand@redhat.com" References: <79886244-1390-6c99-287d-1d868bb4090a@solarflare.com> <20200830112658.0d5f532e@hermes.lan> From: Andrew Rybchenko Autocrypt: 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SMEX-12.5.0.1300-8.6.1012-25636.003 X-MDID: 1598855733-PEh4umr8bcNh Subject: Re: [dpdk-dev] [PATCH] doc: announce changes to ethdev rxconf structure 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" Hi Stephen, On 8/30/20 9:26 PM, Stephen Hemminger wrote: > On Sun, 30 Aug 2020 15:58:57 +0300 > Andrew Rybchenko wrote: > >>>>>>> >>>>>>> The non-zero value of rx_split_num field configures the receiving >>>>>>> queue to split ingress packets into multiple segments to the mbufs >>>>>>> allocated from various memory pools according to the specified >>>>>>> lengths. The zero value of rx_split_num field provides the backward >>>>>>> compatibility and queue should be configured in a regular way (with >>>>>>> single/multiple mbufs of the same data buffer length allocated from >>>>>>> the single memory pool). >>>>>> >>>>>> From the above description it is not 100% clear how it will coexist with: >>>>>>  - existing mb_pool argument of the rte_eth_rx_queue_setup() >>>>>>  - DEV_RX_OFFLOAD_SCATTER >>>>> >>>>> DEV_RX_OFFLOAD_SCATTER flag is required to be reported and configured >>>>> for the new feature to indicate the application is prepared for the >>>>> multisegment packets. >>>> >>>> I hope it will be mentioned in the feature documentation in the future, but >>>> I'm not 100% sure that it is required. See below. >>> I suppose there is the hierarchy: >>> - applications configures DEV_RX_OFFLOAD_SCATTER on the port and tells in this way: >>> "Hey, driver, I'm ready to handle multi-segment packets". Readiness in general. >>> - application configures BUFFER_SPLIT and tells PMD _HOW_ it wants to split, in particular way: >>> "Hey, driver, please, drop ten bytes here, here and here, and the rest - over there" >> >> My idea is to keep SCATTER and BUFFER_SPLIT independent. >> SCATTER is a possibility to make multi-segment packets getting >> mbufs from main rxq mempool as many as required. >> BUFFER_SPLIT is support of many mempools and splitting >> received packets as specified. > > No. > Once again, drivers should take anything from application and rely on using > logic to choose best path. Modern CPU's have good branch predictors, and making > the developer do that work is counter productive. Please, add a bit more details. I simply can see relationship. So, right now for me it looks like just misunderstanding. Thanks, Andrew.