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 29FA9C4743C for ; Mon, 21 Jun 2021 14:50:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14DC060C41 for ; Mon, 21 Jun 2021 14:50:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229904AbhFUOxE (ORCPT ); Mon, 21 Jun 2021 10:53:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229807AbhFUOxD (ORCPT ); Mon, 21 Jun 2021 10:53:03 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A907C061574 for ; Mon, 21 Jun 2021 07:50:49 -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=Y0+9SZXkL6wTA6Vumrb8feSJXVfoF0NGP6IQu4eH4mQ=; b=fQn7P3mF0XncP6ZfPhFmrWj2FN NYgpSO9F1j4XzzMBOVl09cEI8Ha1Zlg3t/2EVi0q1Mb9RImD8zUtSt4H5w1WN+v8VZBsUa3Tn6U5a skcdgJZCllfnaUyj46qiHDReLRu2CwNPYsaxWUFlxX6ZizJxcUEQiYtY01AUWx38dWtTOvotYOP3H rBstDDzJethx7FoRwlzxC2ATOQaExh9dIFAlnMEfYSTCCw64kMdMTioT/Ac1D1WHGcT8LFMbdUB1/ +62u9ny0pwokDIfryS/6DIElKcHPKnWg2MKlJi/6tkLg8/risrLcQDYh+tH/HL4bLKFaDbLR9oJHZ GlCpdxUg==; 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 1lvLGC-003qGJ-Dh; Mon, 21 Jun 2021 14:50:48 +0000 Message-ID: <2433592d2b26deec33336dd3e83acfd273b0cf30.camel@infradead.org> Subject: Re: [PATCH] net: tun: fix tun_xdp_one() for IFF_TUN mode From: David Woodhouse To: Jason Wang , netdev Cc: Eugenio =?ISO-8859-1?Q?P=E9rez?= Date: Mon, 21 Jun 2021 15:50:45 +0100 In-Reply-To: <2cbe878845eb2a1e3803b3340263ea14436fe053.camel@infradead.org> References: <03ee62602dd7b7101f78e0802249a6e2e4c10b7f.camel@infradead.org> <2cbe878845eb2a1e3803b3340263ea14436fe053.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-fUduzYh6jozG5RdMJl7V" 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 --=-fUduzYh6jozG5RdMJl7V Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2021-06-21 at 11:52 +0100, David Woodhouse wrote: >=20 > Firstly, I don't think I can set IFF_VNET_HDR on the tun device after > opening it. So my model of "open the tun device, then *see* if we can > use vhost to accelerate it" doesn't work. >=20 > I tried setting VHOST_NET_F_VIRTIO_NET_HDR in the vhost features > instead, but that gives me a weird failure mode where it drops around > half the incoming packets, and I haven't yet worked out why. FWIW that problem also goes away if I set TUNSNDBUF and avoid the XDP data path. --=-fUduzYh6jozG5RdMJl7V 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 cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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