[ovs-dev] Issue about "action=normal" in OVS-DPDK

[Michael Qiu]

Hi, all


When I self-compiled the OVS-2.6 from commit:

commit 7a0f907b2393626dac1387617355990eab69aef7
Author: Justin Pettit <jpettit at ovn.org>
Date:   Tue Sep 27 10:13:42 2016 -0700

     Set release date for 2.6.0.

     Signed-off-by: Justin Pettit <jpettit at ovn.org>
     Acked-by: Ben Pfaff <blp at ovn.org>

I found that when I using "action=normal", the fdb table will never 
learn the mac addr in the packets from the patch port, is it a bug?


This issue lead other problems, all packets to patch port will flooding 
to all ports with the same vlan in the bridge, and I see lots of packet 
copy.


See below:


# ovs-ofctl show br-int
OFPT_FEATURES_REPLY (xid=0x2): dpid:000072fe77bb5849
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(vhuffc5b772-c6): addr:00:00:00:00:00:00
      config:     0
      state:      LINK_DOWN
      speed: 0 Mbps now, 0 Mbps max
  2(patch-tun): addr:7a:85:c5:7d:2f:da
      config:     0
      state:      0
      speed: 0 Mbps now, 0 Mbps max
  3(vhu88dab7aa-ae): addr:00:00:00:00:00:00
      config:     0
      state:      LINK_DOWN
      speed: 0 Mbps now, 0 Mbps max
  8(vhu29e6e817-63): addr:00:00:00:00:00:00
      config:     0
      state:      0
      speed: 0 Mbps now, 0 Mbps max
  LOCAL(br-int): addr:72:fe:77:bb:58:49
      config:     PORT_DOWN
      state:      LINK_DOWN
      current:    10MB-FD COPPER
      speed: 10 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0


# ovs-ofctl show br-tun
OFPT_FEATURES_REPLY (xid=0x2): dpid:00007e58c1f5b141
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(patch-int): addr:56:36:bb:1e:ec:c7
      config:     0
      state:      0
      speed: 0 Mbps now, 0 Mbps max
  5(vxlan-c0a8c80b): addr:26:e9:2b:31:62:8b
      config:     0
      state:      0
      speed: 0 Mbps now, 0 Mbps max
  6(vxlan-c0a8c80c): addr:2a:07:0e:84:fd:8e
      config:     0
      state:      0
      speed: 0 Mbps now, 0 Mbps max
  LOCAL(br-tun): addr:7e:58:c1:f5:b1:41
      config:     PORT_DOWN
      state:      LINK_DOWN
      current:    10MB-FD COPPER
      speed: 10 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0



# ovs-vsctl show
57863254-3c79-4dc7-a6a0-277eb8c741f4
     Bridge br-dpdk
         Port br-dpdk
             Interface br-dpdk
                 type: internal
         Port "dpdk0"
             Interface "dpdk0"
                 type: dpdk
     Bridge br-int
         fail_mode: secure
         Port patch-tun
             Interface patch-tun
                 type: patch
                 options: {peer=patch-int}
         Port "vhu29e6e817-63"
             tag: 1
             Interface "vhu29e6e817-63"
                 type: dpdkvhostuser
         Port "vhuffc5b772-c6"
             tag: 2
             Interface "vhuffc5b772-c6"
                 type: dpdkvhostuser
         Port "vhu88dab7aa-ae"
             tag: 1
             Interface "vhu88dab7aa-ae"
                 type: dpdkvhostuser
         Port br-int
             Interface br-int
                 type: internal

     Bridge br-tun
         fail_mode: secure
         Port br-tun
             Interface br-tun
                 type: internal
         Port "vxlan-c0a8c80b"
             Interface "vxlan-c0a8c80b"
                 type: vxlan
                 options: {df_default="true", in_key=flow, 
local_ip="192.168.200.14", out_key=flow, remote_ip="192.168.200.11"}
         Port "vxlan-c0a8c80c"
             Interface "vxlan-c0a8c80c"
                 type: vxlan
                 options: {df_default="true", in_key=flow, 
local_ip="192.168.200.14", out_key=flow, remote_ip="192.168.200.12"}
         Port patch-int
             Interface patch-int
                 type: patch
                 options: {peer=patch-tun}
     ovs_version: "2.6.0"


Flow Table：

br-int:

ovs-ofctl add-flow br-int "in_port=2,action=output:8"

ovs-ofctl add-flow br-int "in_port=8,action=output:normal"


br-tun

ovs-ofctl add-flow br-tun 
"in_port=1,action=set_tunnel:0x46,strip_vlan,output:6"

ovs-ofctl add-flow br-tun "in_port=6,action=output:1"


VM using port 8(vhu29e6e817-63)  as vhost-user port:

(creat hugepage first)

/usr/libexec/qemu-kvm -machine pc,accel=kvm,usb=off  -cpu host -m 2048 
-smp 2,sockets=2,cores=1,threads=1 -drive 
file=/var/lib/nova/instances/_base/0fc2479281ab0a4ca901b7981122a180f843b2bf 
-chardev socket,id=charnet0,path=/var/run/openvswitch/vhu29e6e817-63 
-netdev type=vhost-user,id=hostnet0,chardev=charnet0 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:61:23:ed,bus=pci.0,addr=0x3 
-object 
memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=yes,size=2147483648,host-nodes=0,policy=bind 
-numa node,nodeid=0,cpus=0-1,memdev=ram-node0  -vnc 0.0.0.0:0 -k en-us 
-device cirrus-vga,id=video0,bus=pci.0,addr=0x2


In VM ping another VM in other hosts, which  using native OVS.

Then find in OVS-DPDK:

# ovs-appctl fdb/show br-int
  port  VLAN  MAC                Age
     8     1       fa:16:3e:61:23:ed    1


In OVS(another host, port 4 is patch port.):

  ovs-appctl fdb/show br-int
  port  VLAN  MAC                Age
     6     2       fa:16:3e:09:9d:bc    0
     4     2       fa:16:3e:61:23:ed    0


This issue will cause packets flooding in br-int.

Any sulotions?


-- 
Thanks,
Michael