VIRTIO interface with DPDK in Guest VM not receiving packets

VIRTIO interface with DPDK in Guest VM not receiving packets

[Ajeet Gill (ajgill)]

Hello ,
  I have observed that QEMU/Host does not pass the packets to Guest VM on Virtio interfaces unless I turn on promisc  mode on the interface in the Guest.

Host is running RHEL 7.2. Have tried with Ubuntu 14.4 as well . No DPDK-OVS or any vhost-user.

Is this expected behavior?   I would not assume this should be.  Any pointers to look into?

Thanks and Regards,
Ajeet

Re: VIRTIO interface with DPDK in Guest VM not receiving packets

[Abhijeet Karve]

Hi Ajeet,

We already tried setting up dpdk with vhostuser as a network attachment 
option and what we have following observations,

 1st, it's not like we need to turn promisc mode enabled for host to guest 
communication to happen. We can turn them up with specific dpdk 
application arguments if we need.
 2nd, is when we tried cirros 0.3.0, it's found that the cirros 0.3.0 is 
having a bug which clearly ignores DHCP responses. If you try with cirros 
0.3.1 then it will work i guess.
 3rd, is Cirros doesn’t get ip –  root cause – br-dpdk needs to be 
configured with ip and up.


Thanks & Regards
Abhijeet Karve

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Re: VIRTIO interface with DPDK in Guest VM not receiving packets

[Thomas Monjalon]

May I kindly ask you to remove this footer from your emails?
Thanks

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