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=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 38688C48BDF for ; Thu, 24 Jun 2021 07:07:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D06E613E7 for ; Thu, 24 Jun 2021 07:07:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231436AbhFXHJq (ORCPT ); Thu, 24 Jun 2021 03:09:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231477AbhFXHIg (ORCPT ); Thu, 24 Jun 2021 03:08:36 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 94865C061574 for ; Thu, 24 Jun 2021 00:05:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=7gAZxIl1OsmmTIITBNCtItCx+SUG3LgAgfurg61s9zQ=; b=XyFG6zAr9zYNdYb/VkyveZ/bHQ KOIXH3Fh+JVTH0E6gVTz2uYJiB/nPZV2dSzWYFANZjKT/pjF76/LVtwHXrokXPmuF3SGJW+RiyqGO TbqRejQA5ahBPXjN30WEjD5Ra9RIqsN+3IVj3DxHAybYsvrZD7/6hcL5NttP5qk2k4wLfii5l0HCu UWRM+fzl8DLFmKQ+Uguqz5nZhHLuw7KqSdem8I8p+QkDDOXoYAryBPd/9KTyaTuSg/PsFfXK+dDP5 d+pP/W4zwaxkAllTEQWrE527+9eI12mqjAmRqauVUxGn8X8oBQsTor+/QCXpHEXjAm3QP/w4QSDGy 8m7RS8wQ==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lwJQp-00D5ro-L0; Thu, 24 Jun 2021 07:05:48 +0000 Message-ID: <8ff25025b4c5e167c3176b4607191019e4f3729a.camel@infradead.org> Subject: Re: [PATCH v2 1/4] net: tun: fix tun_xdp_one() for IFF_TUN mode From: David Woodhouse To: Jason Wang , netdev@vger.kernel.org Cc: Eugenio =?ISO-8859-1?Q?P=E9rez?= Date: Thu, 24 Jun 2021 08:05:45 +0100 In-Reply-To: References: <03ee62602dd7b7101f78e0802249a6e2e4c10b7f.camel@infradead.org> <20210622161533.1214662-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-jW0kPcffSHK7hF+IKkMQ" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --=-jW0kPcffSHK7hF+IKkMQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-06-24 at 14:18 +0800, Jason Wang wrote: > =E5=9C=A8 2021/6/23 =E4=B8=8B=E5=8D=889:52, David Woodhouse =E5=86=99=E9= =81=93: > > On Wed, 2021-06-23 at 11:45 +0800, Jason Wang wrote: > > > As replied in previous version, it would be better if we can unify > > > similar logic in tun_get_user(). > >=20 > > So that ends up looking something like this (incremental). > >=20 > > Note the '/* XXX: frags && */' part in tun_skb_set_protocol(), because > > the 'frags &&' was there in tun_get_user() and it wasn't obvious to me > > whether I should be lifting that out as a separate argument to > > tun_skb_set_protocol() or if there's a better way. > >=20 > > Either way, in my judgement this is less suitable for a stable fix and > > more appropriate for a follow-on cleanup. But I don't feel that > > strongly; I'm more than happy for you to overrule me on that. > > Especially if you fix the above XXX part while you're at it :) >=20 >=20 > By simply adding a boolean "pull" in tun_skb_set_protocol()? Sure; thanks. It's been a few years since I really played with skb handling; I was half hoping for a simpler "you don't need to because..." answer, but that works :) --=-jW0kPcffSHK7hF+IKkMQ Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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