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From: "Gray, Mark D" <mark.d.gray@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>,
	Franck BAUDIN <Franck.BAUDIN@qosmos.com>,
	"Xie, Huawei" <huawei.xie@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"dpdk-ovs@lists.01.org" <dpdk-ovs@lists.01.org>
Subject: Re: [dpdk-dev] Wrong TCP checksum of packets sent by Linux guest	(virtIO/vhost)
Date: Wed, 3 Sep 2014 10:00:54 +0000
Message-ID: <738D45BC1F695740A983F43CFE1B7EA92D72308F@IRSMSX102.ger.corp.intel.com> (raw)
In-Reply-To: <1686757.iSdNo6aMGt@xps13>

> 
> Hi Franck,
> 
> 2014-09-02 13:20, Franck BAUDIN:
> > I am using dpdk-ovs 1.1.0 (latest release) as follow :
> >
> > linux-guest (no DPKD) <---  virtIO ---> OVDK 1.1.0 (with latest DPDK [*]) < --
> - Niantic --- > linux-native
> >
> [...]
> > UDP/ICMP connectivity is fine, but TCP checksum of packet sent by the
> guest are incorrect, as showed with tcpdump on linux-native.
> 
> Thanks for reporting.
> Could you try virtio without vhost?
> 
> 

Looping in the dpdk-ovs list. 

* Does the new vhost API allow a user to know if all the relevant offloads have been
turned on/off for that interface? It seems that this is possible through the virtio_net
structure but it would be good to get some feedback from the relevant person
working on DPDK (Huawei?).

* If this is the case, then it is probably in the realm of the vswitch do the actual 
checksum (for VM-VM) or correctly configure the NIC when sending out through
the physical interface.

Comments?

Mark

  parent reply	other threads:[~2014-09-03  9:57 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-02 13:20 Franck BAUDIN
2014-09-02 13:29 ` Thomas Monjalon
2014-09-02 14:37   ` Franck Baudin
2014-09-03 10:00   ` Gray, Mark D [this message]
2014-09-03 11:13     ` Xie, Huawei
2014-09-03 14:12       ` Franck Baudin
2014-09-03 16:07         ` Gray, Mark D
2014-09-04  2:54         ` Xie, Huawei
2014-09-04  9:24           ` Franck Baudin
2014-09-04 10:35             ` Xie, Huawei
2014-09-03 16:15       ` Gray, Mark D

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