[ovs-discuss] [ovs-dpdk] how to link between guest vNIC and dpdkvhost socket

[Flavio Leitner]

On Wed, 25 Oct 2017 07:36:13 +0000
"Xu, Rongjie (NSB - CN/Hangzhou)" <rongjie.xu at nokia-sbell.com> wrote:

> Hi,
> 
> I have one OpenStack environment with OVS-DPDK (manually installed). I success to launch two VMs on two separate compute node with vhostuser interface type. But I cannot ping from one to another. I found there are even no packets in the local 'br-int' bridge (where dpdkvhostuser interface is attached). My guess is the link between guest vNIC and dpdkvhost socket at host side is somehow broken, but I do not know how to proceed. Anyone any suggestions?


Most probably you forgot to share the memory between host and guest.
in the VM xml:

E.g.:
  <memoryBacking>
    <hugepages>
      <page size='2' unit='M' nodeset='0'/>
    </hugepages>
  </memoryBacking>
...
    <numa>
      <cell id='0' cpus='0-1' memory='4194304' unit='KiB' memAccess='shared'/>
    </numa>
...

fbl

> Compute0:
>     Bridge br-int
>         Controller "tcp:127.0.0.1:6633"
>             is_connected: true
>         fail_mode: secure
>         Port "vhu2aae3928-3c"
>             tag: 1
>             Interface "vhu2aae3928-3c"
>                 type: dpdkvhostuser
> root at compute0:~# file /var/run/openvswitch/vhu2aae3928-3c
> /var/run/openvswitch/vhu2aae3928-3c: socket
> 
> Compute1:
>     Bridge br-int
>         Controller "tcp:127.0.0.1:6633"
>             is_connected: true
>         fail_mode: secure
>         Port "vhuca25b420-6d"
>             tag: 1
>             Interface "vhuca25b420-6d"
>                type: dpdkvhostuser
> root at compute1:~# file /var/run/openvswitch/vhuca25b420-6d
> /var/run/openvswitch/vhuca25b420-6d: socket
> 
> 
> When I ping, I even does not find ARP packets in the br-int flow tables.
> root at compute0:~# ovs-ofctl dump-flows br-int | grep "in_port=3"
> cookie=0xb177d87a58ae18fe, duration=1927.889s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=10,icmp6,in_port=3,icmp_type=136 actions=resubmit(,24)
> cookie=0xb177d87a58ae18fe, duration=1927.886s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=10,arp,in_port=3 actions=resubmit(,24)
> cookie=0xb177d87a58ae18fe, duration=1927.893s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=9,in_port=3 actions=resubmit(,25)
> cookie=0xb177d87a58ae18fe, duration=1927.891s, table=24, n_packets=0, n_bytes=0, idle_age=1927, priority=2,icmp6,in_port=3,icmp_type=136,nd_target=fe80::f816:3eff:fed3:2116 actions=NORMAL
> cookie=0xb177d87a58ae18fe, duration=1927.888s, table=24, n_packets=0, n_bytes=0, idle_age=1927, priority=2,arp,in_port=3,arp_spa=192.168.100.13 actions=resubmit(,25)
> cookie=0xb177d87a58ae18fe, duration=1927.896s, table=25, n_packets=0, n_bytes=0, idle_age=1927, priority=2,in_port=3,dl_src=fa:16:3e:d3:21:16 actions=NORMAL
> 
> root at compute0:~# ovs-ofctl show br-int
> OFPT_FEATURES_REPLY (xid=0x2): dpid:0000caf6709a034a
> n_tables:254, n_buffers:256
> capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
> actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
> 1(int-br0): addr:7e:de:e2:7b:2a:83
>      config:     0
>      state:      0
>      speed: 0 Mbps now, 0 Mbps max
> 2(patch-tun): addr:5a:2a:d3:f0:14:72
>      config:     0
>      state:      0
>      speed: 0 Mbps now, 0 Mbps max
> 3(vhu2aae3928-3c): addr:00:00:00:00:00:00
>      config:     0
>      state:      0
>      speed: 0 Mbps now, 0 Mbps max
> 
> Best Regards
> Xu Rongjie (Max)
> 



-- 
Flavio