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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable 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 0944EC07542 for ; Sat, 25 May 2019 20:46:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0DCB2081C for ; Sat, 25 May 2019 20:46:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=appneta.com header.i=@appneta.com header.b="thWHGLVr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727496AbfEYUqK (ORCPT ); Sat, 25 May 2019 16:46:10 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:45486 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725951AbfEYUqJ (ORCPT ); Sat, 25 May 2019 16:46:09 -0400 Received: by mail-pg1-f194.google.com with SMTP id w34so2243923pga.12 for ; Sat, 25 May 2019 13:46:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=appneta.com; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=qo8JrOOZqi12jkLNvRxgMvVScnv0tXvVQTmMYH0OKSE=; b=thWHGLVr4cU7dJKLdMWPO72IcwgIUO6hCDtvYPNJxvRmFABU5gDC/mRGcgxLAmjdFO Oh0yt+kdymYu11rdgIzECutsKWeYt5hzZggVnh7yjPN3iKgtTUaDX71jipxAXNjnZwdU 9zm0rBy9oCa+p5uezRtBcDS0eb+z8ywJ1Cy3c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=qo8JrOOZqi12jkLNvRxgMvVScnv0tXvVQTmMYH0OKSE=; b=qLl9Nf9+xBGqMJONxkY4PwSnbzfVNWFu143X+2IGkUu0ymzstj166pfiOSeBGZRqck jk8UoloD5xmgH2GDbeH1uZxDU6bbUU1NDEdn9QTue9MgGgvVZNLHhCixu2hfoBnqckTP eckiAoGYjA72SXghSSdieDRhoztQg9jf+cFG+cTsNoemRLt8n7tZ/jUtFw4fIB+W6aL1 oF3Y8dTYo/XhgsGaRf6mt2qY8D//LM8DNBSnIsIDahBQxYPnxGccGMQj5Jd3jEGOrWZh 4iF+J5Yi1y3dgVQrArS3aZzVKzlbdTmuH2S15FpbzJt9t1+oz++k/1Nj8rsclrlcOWRI lPaA== X-Gm-Message-State: APjAAAVQGKBtcMHKGMRBdxud4pxPddotYten9f337zAQpPQnHfusYsN0 20lK/UTCAgv21FkghLQRO3vWtQ== X-Google-Smtp-Source: APXvYqzPaHFWQxMwohp9Yc0Omohint92w9s29CVWXD2wQWQNWaD5UzsOvqltGy2QkyvJLRqj3EN7KA== X-Received: by 2002:a62:5653:: with SMTP id k80mr121841807pfb.144.1558817168926; Sat, 25 May 2019 13:46:08 -0700 (PDT) Received: from [10.0.1.19] (S010620c9d00fc332.vf.shawcable.net. [70.71.167.160]) by smtp.gmail.com with ESMTPSA id p16sm6510085pff.35.2019.05.25.13.46.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 May 2019 13:46:08 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: [PATCH net 1/4] net/udp_gso: Allow TX timestamp with UDP GSO From: Fred Klassen In-Reply-To: Date: Sat, 25 May 2019 13:46:07 -0700 Cc: "David S. Miller" , Alexey Kuznetsov , Hideaki YOSHIFUJI , Shuah Khan , Network Development , LKML , linux-kselftest@vger.kernel.org, Willem de Bruijn Content-Transfer-Encoding: quoted-printable Message-Id: <7FB4B2F6-A7F3-4565-8D53-CF0E5A3EEFA4@appneta.com> References: <20190523210651.80902-1-fklassen@appneta.com> <20190523210651.80902-2-fklassen@appneta.com> To: Willem de Bruijn X-Mailer: Apple Mail (2.3445.104.11) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On May 23, 2019, at 2:39 PM, Willem de Bruijn = wrote: > Zerocopy notification reference count is managed in skb_segment. That > should work. >=20 I=E2=80=99m trying to understand the context of reference counting in = skb_segment. I assume that there is an opportunity to optimize the count of outstanding zerocopy = buffers, but I=20 can=E2=80=99t see it. Please clarify.