From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D050BC3F68F for ; Fri, 17 Jan 2020 12:17:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B115E2073A for ; Fri, 17 Jan 2020 12:17:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728249AbgAQMR1 (ORCPT ); Fri, 17 Jan 2020 07:17:27 -0500 Received: from a.mx.secunet.com ([62.96.220.36]:53966 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726917AbgAQMR1 (ORCPT ); Fri, 17 Jan 2020 07:17:27 -0500 Received: from localhost (localhost [127.0.0.1]) by a.mx.secunet.com (Postfix) with ESMTP id 5DCA32009B; Fri, 17 Jan 2020 13:17:26 +0100 (CET) X-Virus-Scanned: by secunet Received: from a.mx.secunet.com ([127.0.0.1]) by localhost (a.mx.secunet.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Lj_GRaoIdKkT; Fri, 17 Jan 2020 13:17:25 +0100 (CET) Received: from mail-essen-01.secunet.de (mail-essen-01.secunet.de [10.53.40.204]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by a.mx.secunet.com (Postfix) with ESMTPS id 286F820299; Fri, 17 Jan 2020 13:17:23 +0100 (CET) Received: from gauss2.secunet.de (10.182.7.193) by mail-essen-01.secunet.de (10.53.40.204) with Microsoft SMTP Server id 14.3.439.0; Fri, 17 Jan 2020 13:17:22 +0100 Received: by gauss2.secunet.de (Postfix, from userid 1000) id B43C931801F7; Fri, 17 Jan 2020 13:17:22 +0100 (CET) Date: Fri, 17 Jan 2020 13:17:22 +0100 From: Steffen Klassert To: Ayush Sawal CC: Herbert Xu , , , Ayush Sawal , Subject: Re: Advertise maximum number of sg supported by driver in single request Message-ID: <20200117121722.GG26283@gauss3.secunet.de> References: <20200115060234.4mm6fsmsrryzpymi@gondor.apana.org.au> <9fd07805-8e2e-8c3f-6e5e-026ad2102c5a@chelsio.com> <20200117062300.qfngm2degxvjskkt@gondor.apana.org.au> <20d97886-e442-ed47-5685-ff5cd9fcbf1c@asicdesigners.com> <20200117070431.GE23018@gauss3.secunet.de> <318fd818-0135-8387-6695-6f9ba2a6f28e@asicdesigners.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <318fd818-0135-8387-6695-6f9ba2a6f28e@asicdesigners.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-EXCLAIMER-MD-CONFIG: 2c86f778-e09b-4440-8b15-867914633a10 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Jan 17, 2020 at 04:28:54PM +0530, Ayush Sawal wrote: > Hi steffen, > > On 1/17/2020 12:34 PM, Steffen Klassert wrote: > > On Fri, Jan 17, 2020 at 12:13:07PM +0530, Ayush Sawal wrote: > > > Hi Herbert, > > > > > > On 1/17/2020 11:53 AM, Herbert Xu wrote: > > > > On Thu, Jan 16, 2020 at 01:27:24PM +0530, Ayush Sawal wrote: > > > > > The max data limit is 15 sgs where each sg contains data of mtu size . > > > > > we are running a netperf udp stream test over ipsec tunnel .The ipsec tunnel > > > > > is established between two hosts which are directly connected > > > > Are you actually getting 15-element SG lists from IPsec? What is > > > > generating an skb with 15-element SG lists? > > > we have established the ipsec tunnel in transport mode using ip xfrm. > > > and running traffic using netserver and netperf. > > > > > > In server side we are running > > > netserver -4 > > > In client side we are running > > > "netperf -H -p -t UDP_STREAM  -Cc -- -m 21k" > > > where the packet size is 21k ,which is then fragmented into 15 ip fragments > > > each of mtu size. > > I'm lacking a bit of context here, but this should generate 15 IP > > packets that are encrypted one by one. > This is what i observed ,please correct me if i am wrong. > The packet when reaches esp_output(),is in socket buffer and based on the > number of frags ,sg is initialized  using > sg_init_table(sg,frags),where frags are 15 in our case. The packet should be IP fragmented before it enters esp_output() unless this is a UDP GSO packet. What kind of device do you use here? Is it a crypto accelerator or a NIC that can do ESP offloads?