[Bug 1639273] Re: openvswitch port mirroring only mirrors egress traffic

[Xiang Hui]

After applying this patch, ingress traffic are catched.
####
08:26:09.528646 fa:16:3e:92:5c:7c (oui Unknown) > fa:16:3e:06:48:2d (oui Unknown), ethertype IPv4 (0x0800), length 98: xianghui-bastion.openstacklocal > 192.168.21.5: ICMP echo request, id 32688, seq 1, length 64
08:26:09.529292 fa:16:3e:06:48:2d (oui Unknown) > fa:16:3e:92:5c:7c (oui Unknown), ethertype IPv4 (0x0800), length 98: 192.168.21.5 > xianghui-bastion.openstacklocal: ICMP echo reply, id 32688, seq 1, length 64

# dp flow
port 6: qvof33b94a9-bd
port 7: qvo8a0d7c3b-b2
tunnel(tun_id=0x5,src=10.5.6.210,dst=10.5.6.213,ttl=64,flags(-df-csum+key)),in_port(2),skb_mark(0),eth(src=fa:16:3e:92:5c:7c,dst=fa:16:3e:06:48:2d),eth_type(0x0800),ipv4(frag=no), packets:116, bytes:12356, used:1.776s, actions:6,7



** Patch added: "trusty_liberty_ovs_mirror.debdiff"
   https://bugs.launchpad.net/cloud-archive/+bug/1639273/+attachment/4777515/+files/trusty_liberty_ovs_mirror.debdiff

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https://bugs.launchpad.net/bugs/1639273

Title:
  openvswitch port mirroring only mirrors egress traffic

Status in Ubuntu Cloud Archive:
  New
Status in openvswitch:
  New

Bug description:
  with a liberty openstack installation (openvswitch
  2.4.1-0ubuntu0.15.10.1~cloud0) with two VMs, when vm1's interface is
  mirrored to vm2's interface, only vm1's egress traffic is mirrored;
  ingress traffic does not appear on vm2's interface.


  ubuntu at machine-15:~$ sudo ovs-vsctl list mirror 
  ubuntu at machine-15:~$ sudo ovs-vsctl -- set Bridge br-int mirrors=@m -- --id=@qvo07e7496c-a1 get Port qvo07e7496c-a1 -- --id=@qvo91feef0f-f9 get Port qvo91feef0f-f9 -- --id=@m create Mirror name=mirror3 select-src-port=@qvo07e7496c-a1 select-dst-port=@qvo07e7496c-a1 output-port=@qvo91feef0f-f9 
  7e9e725f-1d23-4b30-8e46-82f7f7e71353 
  ubuntu at machine-15:~$ sudo ovs-vsctl list mirror 
  _uuid : 7e9e725f-1d23-4b30-8e46-82f7f7e71353 
  external_ids : {} 
  name : "mirror3" 
  output_port : a0e92620-37dd-4fd6-b514-45d47526306a 
  output_vlan : [] 
  select_all : false 
  select_dst_port : [cafc190f-e89a-4f2c-ab56-2072351bbe41] 
  select_src_port : [cafc190f-e89a-4f2c-ab56-2072351bbe41] 
  select_vlan : [] 
  statistics : {} 


  ubuntu at machine-15:~$ ping -c 1 10.5.150.3 
  PING 10.5.150.3 (10.5.150.3) 56(84) bytes of data. 
  64 bytes from 10.5.150.3: icmp_seq=1 ttl=63 time=4.26 ms 

  --- 10.5.150.3 ping statistics --- 
  1 packets transmitted, 1 received, 0% packet loss, time 0ms 
  rtt min/avg/max/mdev = 4.268/4.268/4.268/0.000 ms 

  
  on vm 1 both directions appear, as expected: 

  17:16:13.093469 IP 10.5.2.1 > 192.168.21.7: ICMP echo request, id 9031, seq 1, length 64 
  17:16:13.094792 IP 192.168.21.7 > 10.5.2.1: ICMP echo reply, id 9031, seq 1, length 64 

  
  on vm 2 only outgoing traffic is mirrored: 

  17:16:13.095066 IP 192.168.21.7 > 10.5.2.1: ICMP echo reply, id 9031,
  seq 1, length 64

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