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

Bala Sankaran bsankara at redhat.com
Thu Jul 5 16:53:20 CEST 2018


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.


----- 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

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