[ovs-discuss] OVS-DPDK - TAP0 - vdev (af_packet) device is linkdown

Avi Cohen (A) avi.cohen at huawei.com
Tue Jun 20 09:40:47 UTC 2017

Hello All,

I did upgrade to dpdk-17.05 and ovs-2-7.1 and create a vdev - af_packet device according the config script below 
This tap device connects the ovs-dpdk to a name space
The problem is that this tap00 device is linkdown - (never reach  RUNNING state )  - hence no pkt is received transmitted on this interface  although the tap0 creation in ovs is OK, 
I'm attaching  the config script and output of netstat and ifconfig in the namespace
Can someone please tell me how to activate the tap0 ?

Config script :

cd ../dpdk-17.05/usertools/
modprobe uio
insmod ../x86_64-native-linuxapp-gcc/kmod/igb_uio.ko
ifconfig ens3 down

./dpdk-devbind.py --bind=igb_uio 0000:00:03.0 ./dpdk-devbind.py --status

cd -

pkill -9 ovs
rm -rf /usr/local/var/run/openvswitch
rm -rf /usr/local/etc/openvswitch/
rm -f /usr/local/etc/openvswitch/conf.db
mkdir -p /usr/local/etc/openvswitch
mkdir -p /usr/local/var/run/openvswitch

./ovsdb/ovsdb-tool create /usr/local/etc/openvswitch/conf.db ./vswitchd/vswitch.ovsschema ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach ./utilities/ovs-vsctl --no-wait init

echo 8192 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
echo 8192 > /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages 

mkdir -p /mnt/huge
mkdir -p /mnt/huge_2mb
mount -t hugetlbfs none /mnt/huge_2mb -o pagesize=2MB

modprobe openvswitch
export DB_SOCK=/usr/local/var/run/openvswitch/db.sock

./utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true ./vswitchd/ovs-vswitchd unix:$DB_SOCK --pidfile --detach ./utilities/ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0x80

utilities/ovs-vsctl --may-exist add-br br-int \
  -- set Bridge br-int datapath_type=netdev \
  -- br-set-external-id br-int bridge-id br-int \
  -- set bridge br-int fail-mode=standalone 

ip tuntap add dev tap0 mode tap

ovs-vsctl add-port br-int tap0 -- set Interface tap0 type=dpdk \

ip netns add red
ip link set tap0 netns red
ip netns exec red ip addr add dev tap0 ip netns exec red ip link set tap0 up

utilities/ovs-vsctl --may-exist add-port br-int vxlan0 \
  -- set interface vxlan0 type=vxlan options:remote_ip= options:key=1000 

utilities/ovs-vsctl --may-exist add-br br-phy \
    -- set Bridge br-phy datapath_type=netdev \
    -- br-set-external-id br-phy bridge-id br-phy \
    -- set bridge br-phy fail-mode=standalone \

utilities/ovs-vsctl --timeout 10 --may-exist add-port br-phy dpdk0 -- set Interface dpdk0 type=dpdk options:dpdk-devargs=0000:00:03.0 

ip addr add dev br-phy

ip link set br-phy up
ip link set br-int up
iptables -F

utilities/ovs-appctl ovs/route/show

ip netns exec red bash
ifconfig lo up

netstat -v -s -e
    7 total packets received
    0 forwarded
    0 incoming packets discarded
    7 incoming packets delivered
    14 requests sent out
    7 ICMP messages received
    0 input ICMP message failed.
    ICMP input histogram:
        destination unreachable: 7
    14 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 7
        echo request: 7
        InType3: 7
        OutType3: 7
        OutType8: 7
    0 active connections openings
    0 passive connection openings
    0 failed connection attempts
    0 connection resets received
    0 connections established
    0 segments received
    0 segments send out
    0 segments retransmited
    0 bad segments received.
    0 resets sent
    0 packets received
    0 packets to unknown port received.
    0 packet receive errors
    0 packets sent
    0 packet headers predicted
    InOctets: 784
    OutOctets: 1372
    InNoECTPkts: 7
root at ip-172-31-100-80:/home/ubuntu/openvswitch-2.7.0# ifconfig
lo        Link encap:Local Loopback  
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:784 (784.0 B)  TX bytes:784 (784.0 B)

tap0      Link encap:Ethernet  HWaddr 1a:ef:3c:87:d7:67  
          inet addr:  Bcast:  Mask:
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Best Regards


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