[ovs-discuss] packet drop

[Tony Liu]

The drop is caused by flow change.

When packet is dropped.
========
recirc_id(0),tunnel(tun_id=0x19aca,src=10.6.30.92,dst=10.6.30.22,geneve({class=0x102,type=0x80,len=4,0x20003/0x7fffffff}),flags(-df+csum+key)),in_port(3),eth(src=fa:16:3e:df:1e:85,dst=00:00:00:00:00:00/01:00:00:00:00:00),eth_type(0x0800),ipv4(proto=1,frag=no),icmp(type=8/0xf8), packets:14, bytes:1372, used:0.846s, actions:drop
recirc_id(0),in_port(12),eth(src=fa:16:3e:7d:bb:85,dst=fa:16:3e:df:1e:85),eth_type(0x0800),ipv4(src=192.168.236.152/255.255.255.252,dst=10.6.40.9,proto=1,tos=0/0x3,ttl=64,frag=no),icmp(type=0), packets:6, bytes:588, used:8.983s, actions:drop
========

When packet goes through.
========
recirc_id(0),tunnel(tun_id=0x19aca,src=10.6.30.92,dst=10.6.30.22,geneve({class=0x102,type=0x80,len=4,0x20003/0x7fffffff}),flags(-df+csum+key)),in_port(3),eth(src=fa:16:3e:df:1e:85,dst=00:00:00:00:00:00/01:00:00:00:00:00),eth_type(0x0800),ipv4(proto=1,frag=no),icmp(type=8/0xf8), packets:3, bytes:294, used:0.104s, actions:12
recirc_id(0),in_port(12),eth(src=fa:16:3e:7d:bb:85,dst=fa:16:3e:df:1e:85),eth_type(0x0800),ipv4(src=192.168.236.152/255.255.255.252,dst=10.6.40.9,proto=1,tos=0/0x3,ttl=64,frag=no),icmp(type=0), packets:3, bytes:294, used:0.103s, actions:ct_clear,set(tunnel(tun_id=0x1a8ee,dst=10.6.30.92,ttl=64,tp_dst=6081,geneve({class=0x102,type=0x80,len=4,0x1000b}),flags(df|csum|key))),set(eth(src=fa:16:3e:75:b7:e5,dst=52:54:00:0c:ef:b9)),set(ipv4(ttl=63)),3
========

Is that flow programmed by ovn-controller via ovs-vswitchd?


Thanks!

Tony

> -----Original Message-----
> From: discuss <ovs-discuss-bounces at openvswitch.org> On Behalf Of Tony
> Liu
> Sent: Wednesday, August 5, 2020 2:48 PM
> To: ovs-discuss at openvswitch.org; ovs-dev at openvswitch.org
> Subject: [ovs-discuss] packet drop
> 
> Hi,
> 
> I am running ping from external to VM via OVN gateway.
> On the compute node, ICMP request packet is consistently coming into
> interface "ovn-gatewa-1". But there is about 10 out of 25 packet loss on
> tap interface. It's like the switch pauses 10s after every 15s.
> 
> Has anyone experiences such issue?
> Any advice how to look into it?
> 
> ========
> 21fed09f-909e-4efc-b117-f5d5fcb636c9
>     Bridge br-int
>         fail_mode: secure
>         datapath_type: system
>         Port "ovn-gatewa-0"
>             Interface "ovn-gatewa-0"
>                 type: geneve
>                 options: {csum="true", key=flow, remote_ip="10.6.30.91"}
>                 bfd_status: {diagnostic="No Diagnostic", flap_count="1",
> forwarding="true", remote_diagnostic="No Diagnostic", remote_state=up,
> state=up}
>         Port "tap2588bb4e-35"
>             Interface "tap2588bb4e-35"
>         Port "ovn-gatewa-1"
>             Interface "ovn-gatewa-1"
>                 type: geneve
>                 options: {csum="true", key=flow, remote_ip="10.6.30.92"}
>                 bfd_status: {diagnostic="No Diagnostic", flap_count="1",
> forwarding="true", remote_diagnostic="No Diagnostic", remote_state=up,
> state=up}
>         Port "tap37f6b2d7-cc"
>             Interface "tap37f6b2d7-cc"
>         Port "tap2c4b3b0f-8b"
>             Interface "tap2c4b3b0f-8b"
>         Port "tap23245491-a4"
>             Interface "tap23245491-a4"
>         Port "tap51660269-2c"
>             Interface "tap51660269-2c"
>         Port "tap276cd1ef-e1"
>             Interface "tap276cd1ef-e1"
>         Port "tap138526d3-b3"
>             Interface "tap138526d3-b3"
>         Port "tapd1ae48a1-2d"
>             Interface "tapd1ae48a1-2d"
>         Port br-int
>             Interface br-int
>                 type: internal
>         Port "tapdd08f476-94"
>             Interface "tapdd08f476-94"
> ========
> 
> 
> Thanks!
> 
> Tony
> 
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