[dpdk-users] Traffic doesn't forward on virtual devices

Wiles, Keith keith.wiles at intel.com
Thu Jul 5 17:41:46 CEST 2018



> On Jul 5, 2018, at 9:53 AM, Bala Sankaran <bsankara at redhat.com> wrote:
> 
> Greetings,
> 
> I am currently using dpdk version 17.11.2. I see that there are a few other 
> revisions in 17.11.3, followed by the latest stable version of 18.02.2. 
> 
> Based on the issues I have faced so far (see Original 
> Message below), would you suggest that  I go for 
> another version? If yes, which one? In essence, my question is, would 
> resorting to a different version of dpdk solve my current issue of 
> virtqueue id being invalid? 
> 
> Any help is much appreciated.

>From a support perspective using the latest version 18.05 or the long term supported version 17.11.3 is easier for most to help. I would pick the latest release 18.05 myself. As for fixing this problem I do not know. You can look into the MAINTAINERS file and find the maintainers of area(s) and include them in the CC line on your questions as sometimes they miss the emails as the volume can be high at times.

> 
> Thanks
> 
> ----- Original Message -----
>> From: "Bala Sankaran" <bsankara at redhat.com>
>> To: users at dpdk.org
>> Cc: "Aaron Conole" <aconole at redhat.com>
>> Sent: Thursday, June 28, 2018 3:18:13 PM
>> Subject: Traffic doesn't forward on virtual devices
>> 
>> 
>> Hello team,
>> 
>> I am working on a project to do PVP tests on dpdk. As a first step, I would
>> like to get traffic flow between tap devices. I'm in process of setting up
>> the architecture, in which I've used testpmd to forward traffic between two
>> virtual devices(tap and vhost users) over a bridge.
>> 
>> While I'm at it, I've identified that the internal dev_attached flag never
>> gets set to 1 from the rte_eth_vhost.c file. I've tried to manually set it
>> to 1 in the start routine, but I just see that the queue index being
>> referenced is out of range.
>> 
>> I'm not sure how to proceed.  Has anyone had luck using testpmd to
>> communicate with vhost-user devices?  If yes, any hints on a workaround?
>> 
>> Here's how I configured my setup after installing dpdk and openvswitch:
>> 
>> 1. To start ovs-ctl:
>> /usr/local/share/openvswitch/scripts/ovs-ctl start
>> 
>> 2. Setup hugepages:
>> echo '2048' > /proc/sys/vm/nr_hugepages
>> 
>> 3. Add a new network namespace:
>> ip netns add ns1
>> 
>> 4. Add and set a bridge:
>> ovs-vsctl add-br dpdkbr0 -- set Bridge dpdkbr0 datapath_type=netdev
>> options:vhost-server-path=/usr/local/var/run/openvswitch/vhu0
>> ovs-vsctl show
>> 
>> 5. Add a vhost user to the bridge created:
>> ovs-vsctl add-port dpdkbr0 vhu0 -- set Interface vhu0
>> type=dpdkvhostuserclient
>> 
>> 6. Execute bash on the network namespace:
>> ip netns exec ns1 bash
>> 
>> 7. Use testpmd and connect the namespaces:
>> testpmd --socket-mem=512
>> --vdev='eth_vhost0,iface=/usr/local/var/run/openvswitch/vhu0,queues=1'
>> --vdev='net_tap0,iface=tap0' --file-prefix page0 -- -i
>> 
>> 
>> I repeated steps 3 - 7 for another network namespace on the same bridge.
>> Following this, in fresh terminals, I assigned IP addresses to the tap
>> devices created and tried pinging them. From port statistics,
>> I identified the above mentioned issue with the dev_attached and queue
>> statistics.
>> 
>> I would greatly appreciate any help from your end.
>> 
>> Thanks.
>> 
>> -------------------------------------------------
>> Bala Sankaran
>> Networking Services Intern
>> Red Hat Inc .,
>> 
> -------------------------------------------------
> Bala Sankaran
> Networking Services Intern

Regards,
Keith



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