[ovs-discuss] OVS-DPDK vhostuser guest ping issue

Tue Jan 19 09:21:11 UTC 2016

> 
> Hi All,
>  I'm facing a following issue with OVS-DPDK dpdkvhostuser port. I was able to
> create ovs bridge with dpdkvhostuser port types and able to ping the
> gateway from ovs bridges on the host. But when I'm creating guest VM using
> dpdkvhostuser port type, not able to ping gateway on guest VM. Not seeing
> any error logs in vswitchd log.
>  Following are the list of commands that I used:
>  [root at kujo ~]# ovs-vsctl --no-wait add-br pkt1 -- set Bridge pkt1
> datapath_type=netdev
> [root at kujo ~]# ovs-vsctl add-port pkt1 dpdk0 -- set Interface dpdk0
> type=dpdk
> [root at kujo ~]# ovs-vsctl add-port pkt1 vhostuser0 -- set Interface
> vhostuser0 type=dpdkvhostuser
> [root at kujo ~]#  qemu-system-x86_64 -smp 4 -boot d -cdrom TinyCore-
> current.iso -m 512 TinyCore-current.iso -boot d -name varun  -object
> memory-backend-file,id=mem,size=8192M,mem-
> path=/dev/hugepages,share=on -mem-prealloc -chardev
> socket,id=char1,path=/usr/local/var/run/openvswitch/vhostuser0 -netdev
> type=vhost-user,id=mynet1,chardev=char1,vhostforce -device virtio-net-
> pci,mac=52:55:00:00:20:11,netdev=mynet1 -daemonize
> qemu-system-x86_64: -netdev type=vhost-
> user,id=mynet1,chardev=char1,vhostforce: chardev "char1" went up
> WARNING: Image format was not specified for 'TinyCore-current.iso' and
> probing guessed raw.
>          Automatically detecting the format is dangerous for raw images, write
> operations on block 0 will be restricted.
>          Specify the 'raw' format explicitly to remove the restrictions.
> VNC server running on `::1:5900'
> [root at kujo ~]# ifconfig pkt1 10.54.218.88 netmask 255.255.255.0 up
> [root at kujo ~]# ping -I pkt1 10.54.218.1 [on host]
> PING 10.54.218.1 (10.54.218.1) from 10.54.218.88 pkt1: 56(84) bytes of data.
> 64 bytes from 10.54.218.1: icmp_seq=1 ttl=255 time=11.7 ms
> 64 bytes from 10.54.218.1: icmp_seq=2 ttl=255 time=0.930 ms
> ^C
> --- 10.54.218.1 ping statistics ---
> 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
> rtt min/avg/max/mdev = 0.930/6.351/11.773/5.422 ms
> [root at kujo ~]# ovs-vsctl show
> 2a8a86f3-b813-43a4-826e-dd778aafbcec
>     Bridge "pkt1"
>         Port "pkt1"
>             Interface "pkt1"
>                 type: internal
>         Port "dpdk0"
>             Interface "dpdk0"
>                 type: dpdk
>         Port "vhostuser0"
>             Interface "vhostuser0"
>                 type: dpdkvhostuser
> 
> [root at kujo ~]# ovs-ofctl dump-flows pkt1
> NXST_FLOW reply (xid=0x4):
> cookie=0x0, duration=86.627s, table=0, n_packets=89, n_bytes=8446,
> idle_age=0, priority=0 actions=NORMAL
> 
> [root at kujo ~]# ovs-ofctl dump-ports pkt1
> OFPST_PORT reply (xid=0x2): 3 ports
>   port LOCAL: rx pkts=11, bytes=830, drop=0, errs=0, frame=0, over=0, crc=0
>            tx pkts=5, bytes=434, drop=0, errs=0, coll=0
>   port  1: rx pkts=86, bytes=8638, drop=0, errs=0, frame=0, over=0, crc=0
>            tx pkts=11, bytes=928, drop=0, errs=0, coll=0
>   port  2: rx pkts=0, bytes=?, drop=?, errs=?, frame=?, over=?, crc=?
>            tx pkts=0, bytes=?, drop=11, errs=?, coll=?
> 
> When i'm pinging the guest VM IP [10.54.218.244], I could see the packets
> coming on ovs bridge interface.
>  [root at kujo ~]# ifconfig pkt1
> pkt1: flags=323<UP,BROADCAST,RUNNING,PROMISC>  mtu 1500
>         inet 10.54.218.88  netmask 255.255.255.0  broadcast 10.54.218.255
>         inet6 fe80::e611:5bff:fe98:962  prefixlen 64  scopeid 0x20<link>
>         ether e4:11:5b:98:09:62  txqueuelen 500  (Ethernet)
>         RX packets 10  bytes 850 (850.0 B)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 11  bytes 830 (830.0 B)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> [root at kujo ~]# tcpdump -i pkt1
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on pkt1, link-type EN10MB (Ethernet), capture size 65535 bytes
> 11:01:36.852756 ARP, Request who-has 10.54.218.244 tell 10.54.218.1, length
> 46
> 11:01:41.581666 ARP, Request who-has 10.54.218.244 tell 10.54.218.1, length
> 46
> ^C
> 2 packets captured
> 2 packets received by filter
> 0 packets dropped by kernel
> 
> [root at kujo ~]# route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 0.0.0.0         10.54.28.1      0.0.0.0         UG    100    0        0 eno1
> 10.54.28.0      0.0.0.0         255.255.254.0   U     100    0        0 eno1
> 10.54.218.0     0.0.0.0         255.255.255.0   U     0      0        0 pkt1
> 192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
> 
> Please give me some points to debug this issue. Few months back I used the
> same steps on the same host, it worked fine. I didn't face this kind of issue.

What has changed in your setup since then? OVS/DPDK commit ID etc?

Thanks,
Ciara

> Thanks in advance.
> 
> Regards,
> Varun
> 
> 
> 
> Regards,
> Varun