From owner-freebsd-current@freebsd.org Wed Jul 29 07:47:58 2015 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3BB659AB7B0; Wed, 29 Jul 2015 07:47:58 +0000 (UTC) (envelope-from timp87@gmail.com) Received: from mail-wi0-x22d.google.com (mail-wi0-x22d.google.com [IPv6:2a00:1450:400c:c05::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C61213B9; Wed, 29 Jul 2015 07:47:57 +0000 (UTC) (envelope-from timp87@gmail.com) Received: by wicmv11 with SMTP id mv11so207617485wic.0; Wed, 29 Jul 2015 00:47:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=gUGALStgKfl3ZAfVvP2bXBQ9GTU5g9Ck6+zFFXXkZKE=; b=b6qNqSy36Y4yPqAsepar4hnVl1kxWpKvXFG9sBu1o+LPhAygm5Fe7YSxSgzTAV4b+q D4un6C1RQDWqEDNWtorXgOvEcSKgpUeVIEgmPHPT7TN4vvJtPf9Poqqqp0ENodSuxgx3 OeNSWLSrsP0ftwrMOEYEumvR/uPZAmOQsDb5zYpONmchkWj6Lm0xdMi4e9GE2Scettog P1uUwz72CA1iIzbTv75Uw5adW8pmQHWlfA68P2hhPbKpwy4U3mzbXCRi3NTPRkw1Ry69 ACS9rHfawHCP2fNHMyick9FLYa89Z3grbDc///DExY7KRSBBA8Zck40e11GP5nhuivRd Zz5w== MIME-Version: 1.0 X-Received: by 10.194.2.9 with SMTP id 9mr60753413wjq.95.1438156076020; Wed, 29 Jul 2015 00:47:56 -0700 (PDT) Received: by 10.28.48.207 with HTTP; Wed, 29 Jul 2015 00:47:55 -0700 (PDT) In-Reply-To: References: <20150707130902.GA41189@zxy.spb.ru> <20150707154906.GA44094@zxy.spb.ru> Date: Wed, 29 Jul 2015 10:47:55 +0300 Message-ID: Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V From: Pavel Timofeev To: Wei Hu Cc: Slawa Olhovchenkov , "freebsd-current@freebsd.org" , "freebsd-virtualization@freebsd.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jul 2015 07:47:58 -0000 Hi! r285785 still isn't MFCed. RC2 is coming soon. 2015-07-23 10:54 GMT+03:00 Pavel Timofeev : > Ok, sorry! > > 2015-07-23 7:51 GMT+03:00 Wei Hu : >> The TCP offloading is still working on these platforms. There is no flag= to distinguish UDP and TCP offloading, so the RXCSUM and TXCSUM are still = set. Let me know if there is any other way to show it properly. >> >> Thanks, >> Wei >> >> >> -----Original Message----- >> From: Pavel Timofeev [mailto:timp87@gmail.com] >> Sent: Wednesday, July 22, 2015 9:04 PM >> To: Wei Hu >> Cc: Slawa Olhovchenkov ; freebsd-current@freebsd.org; fr= eebsd-virtualization@freebsd.org >> Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V >> >> Hi! I see you have done the code for disabling UDP checksum offloading w= hen running on the Hyper-V on Windows Server 2012 and earlier hosts >> >> https://svnweb.freebsd.org/base?view=3Drevision&revision=3D285785 >> >> I tried new CURRENT and it works. Thank you! >> >> A small note here: while it disables and works it still shows RXCSUM and= TSCSUM in iface's options: >> >> root@proxy:/usr/src # ifconfig hn0 >> hn0: flags=3D8843 metric 0 mtu 1= 500 >> options=3D31b >> ether 00:15:5d:02:9c:09 >> inet 192.168.25.26 netmask 0xffffffc0 broadcast 192.168.25.63 >> nd6 options=3D29 >> >> Is it possible to hide it automatically if it's disabled by new code? >> >> >> 2015-07-13 11:06 GMT+03:00 Wei Hu : >>> We have root caused the problem. This issue happens on the Hyper-Vs on = Windows Server 2012 (Win 8.0) and earlier releases. On these releases, the = UPD checksum offloading on host side does not work properly. The workaround= is to disable UPD checksum offloading in the FreeBSD guest through 'ifconf= ig'. We are also working on a patch to turn off UPD checksum offloading in = the netvsc driver when detecting the Hyper-V releases. >>> >>> The UDP checksum offloading works fine on Windows Server 2012R2 and Win= 8.1 hosts. >>> >>> Thanks Pavel and Slawa for the support. >>> >>> Wei >>> >>> >>>> -----Original Message----- >>>> From: owner-freebsd-virtualization@freebsd.org [mailto:owner-freebsd- >>>> virtualization@freebsd.org] On Behalf Of Pavel Timofeev >>>> Sent: Wednesday, July 8, 2015 4:06 PM >>>> To: Slawa Olhovchenkov >>>> Cc: freebsd-current@freebsd.org; freebsd-virtualization@freebsd.org >>>> Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V >>>> >>>> Ok, r284746 is the root of the problem. MS DNS works under r284745 >>>> and doesn't work under r284746. >>>> Slawa, what should I look at in wireshark output? >>>> >>>> >>>> 2015-07-07 18:49 GMT+03:00 Slawa Olhovchenkov : >>>> > On Tue, Jul 07, 2015 at 06:04:46PM +0300, Pavel Timofeev wrote: >>>> > >>>> >> Well, turning off checksum offloading by `ifconfig hn0 -txcsum >>>> >> -rxcsum` definitely helps. >>>> >> >>>> >> As for tcpdump I'm not completely sure if I did it right, but I >>>> >> see "bad udp cksum" phrase: >>>> >> >>>> >> # tcpdump -i hn0 -vvv -nn udp dst port 53 >>>> >> tcpdump: listening on hn0, link-type EN10MB (Ethernet), capture >>>> >> size >>>> >> 262144 bytes >>>> >> 18:01:19.139994 IP (tos 0x0, ttl 64, id 61218, offset 0, flags >>>> >> [none], proto UDP (17), length 51) >>>> >> 192.168.25.26.45683 > 192.168.25.3.53: [bad udp cksum 0xb39e >>>> >> -> 0xf210!] 52886+ A? ya.ru. (23) >>>> >> 18:01:24.140544 IP (tos 0x0, ttl 64, id 17293, offset 0, flags >>>> >> [none], proto UDP (17), length 51) >>>> >> 192.168.25.26.12575 > 192.168.25.3.53: [bad udp cksum 0xb39e >>>> >> -> 0x7365!] 52886+ A? ya.ru. (23) >>>> > >>>> > tcpdump "bad udp cksum" is normal on FreeBSD host in case checksum >>>> > offload (and may be need only for help finding issuse in code). >>>> > Need wireshark capturing from MS DNS host (or from mirroring port). >>>> _______________________________________________ >>>> freebsd-virtualization@freebsd.org mailing list >>>> http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization >>>> To unsubscribe, send any mail to "freebsd-virtualization- >>>> unsubscribe@freebsd.org"