Date: Wed, 22 Jul 2015 16:05:46 +0300 From: Pavel Timofeev <timp87@gmail.com> To: Wei Hu <weh@microsoft.com> Cc: Slawa Olhovchenkov <slw@zxy.spb.ru>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: MS DNS doesn't answer to CURRENT under Hyper-V Message-ID: <CAAoTqft=VF-PCV9boXi=tneGtEGsHFLOJhbM1zzbY7vJKF-RnA@mail.gmail.com> In-Reply-To: <CAAoTqftfJbcaHFUeAEYnFpNqhVvyqE=BUwJbE6BSEJ_PEQ9Dwg@mail.gmail.com> References: <CAAoTqftvtQunx%2BWCL4%2BBz-mYSgqCTcGx1aAyemfaz%2B=0ogZuWw@mail.gmail.com> <20150707130902.GA41189@zxy.spb.ru> <CAAoTqfsUfdAP1G=U4eDg3hfmuHtoosgGjOd9gMrehX%2BrcxaiJw@mail.gmail.com> <20150707154906.GA44094@zxy.spb.ru> <CAAoTqft_u1YEOGf6pThhHd-JuYoGnxzQxFpo-57SCUJ0OksWGw@mail.gmail.com> <BY1PR03MB1434AB3E1C8F2D66BDE1AB2CBB9C0@BY1PR03MB1434.namprd03.prod.outlook.com> <CAAoTqftfJbcaHFUeAEYnFpNqhVvyqE=BUwJbE6BSEJ_PEQ9Dwg@mail.gmail.com>
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I rebuilt only kernel if it matters. Not the world. 2015-07-22 16:04 GMT+03:00 Pavel Timofeev <timp87@gmail.com>: > Hi! I see you have done the code for disabling UDP checksum offloading > when 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<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 15= 00 > options=3D31b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,TSO4,TSO6> > ether 00:15:5d:02:9c:09 > inet 192.168.25.26 netmask 0xffffffc0 broadcast 192.168.25.63 > nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > Is it possible to hide it automatically if it's disabled by new code? > > > 2015-07-13 11:06 GMT+03:00 Wei Hu <weh@microsoft.com>: >> We have root caused the problem. This issue happens on the Hyper-Vs on W= indows Server 2012 (Win 8.0) and earlier releases. On these releases, the U= PD checksum offloading on host side does not work properly. The workaround = is to disable UPD checksum offloading in the FreeBSD guest through 'ifconfi= g'. We are also working on a patch to turn off UPD checksum offloading in t= he 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 <slw@zxy.spb.ru>: >>> > 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"
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