From owner-freebsd-bugs@FreeBSD.ORG Wed Apr 4 16:10:01 2012 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id DE7E8106568A for ; Wed, 4 Apr 2012 16:10:01 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 95AA98FC28 for ; Wed, 4 Apr 2012 16:10:01 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q34GA1Vi063678 for ; Wed, 4 Apr 2012 16:10:01 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.5/8.14.5/Submit) id q34GA1J3063677; Wed, 4 Apr 2012 16:10:01 GMT (envelope-from gnats) Resent-Date: Wed, 4 Apr 2012 16:10:01 GMT Resent-Message-Id: <201204041610.q34GA1J3063677@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Arne Schwabe Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 713A91065697 for ; Wed, 4 Apr 2012 16:00:17 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from red.freebsd.org (red.freebsd.org [IPv6:2001:4f8:fff6::22]) by mx1.freebsd.org (Postfix) with ESMTP id 46CEB8FC1D for ; Wed, 4 Apr 2012 16:00:17 +0000 (UTC) Received: from red.freebsd.org (localhost [127.0.0.1]) by red.freebsd.org (8.14.4/8.14.4) with ESMTP id q34G0GOO050726 for ; Wed, 4 Apr 2012 16:00:16 GMT (envelope-from nobody@red.freebsd.org) Received: (from nobody@localhost) by red.freebsd.org (8.14.4/8.14.4/Submit) id q34G0GKX050725; Wed, 4 Apr 2012 16:00:16 GMT (envelope-from nobody) Message-Id: <201204041600.q34G0GKX050725@red.freebsd.org> Date: Wed, 4 Apr 2012 16:00:16 GMT From: Arne Schwabe To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/166645: virtio rxcsum breaks checksum for local linux hosts IPv6 TCP X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Apr 2012 16:10:02 -0000 >Number: 166645 >Category: kern >Synopsis: virtio rxcsum breaks checksum for local linux hosts IPv6 TCP >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Apr 04 16:10:01 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Arne Schwabe >Release: FreeBSD 9.0-RELEASE amd64 >Organization: University of Paderborn >Environment: FreeBSD mail.blinkt.de 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src /sys/GENERIC amd64 >Description: When using rxsum, tcp checksum from offladed ipv6 packets of local kvm guest are incorrect and are thrown away. TCP4 connections work fine. >How-To-Repeat: Setup a ubuntu precise 64 bit machine with kvm and a FreeBSD 9 machine both with virtio drivers. Connect them both to a bridge device (br0) which is connected to an external device (a bond0 device in this case). Do a telnet -6 fbsd ssh from the linux box. >Fix: Using ifconfig vtnet0 -rxcsum solves the problem. >Release-Note: >Audit-Trail: >Unformatted: