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

Xu, Rongjie (NSB - CN/Hangzhou) rongjie.xu at nokia-sbell.com
Wed Oct 25 07:36:13 UTC 2017


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?

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)

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