I found only vxlan topology has this bug.
Other topology such as use patch port , no bug.
----
Simon Jones
Simon Jones <batmanu...@gmail.com> 于2023年6月9日周五 15:20写道：
> The reason why HOST-2 got DUP ICMP reply is HOST-1 got DUP ICMP request.
> The reason HOST-1 got DUP ICMP request is two tnl_pop(2) in actions in
> megaflow-2.
>
> So I have only 1 question:
> Why megaflow-2 on HOST-1 has two tnl_pop(2) in actions ?
>
> ----
> Simon Jones
>
>
> Simon Jones <batmanu...@gmail.com> 于2023年6月9日周五 11:45写道：
>
>> Hi all,
>>
>> I'm using OVS-DPDK of version 2.17.1 .
>>
>> ** 1. This is my vxlan topology **
>>
>> ```
>> ### HOST-1, use ovs-dpdk
>>
>>
>> HOST-1
>> ------
>>
>> br-int
>> |
>> --------- (br-int)
>> | |
>> vxlan1 pf0hpf
>>
>>
>> br-phy(192.168.10.20)
>> |
>> -------- (br-phy)
>> |
>> p0
>>
>> [root@localhost ~]# ovs-vsctl show
>> 62001a07-219d-48d8-ac1d-fb378a3ad231
>> Bridge br-int
>> datapath_type: netdev
>> Port vxlan1
>> Interface vxlan1
>> type: vxlan
>> options: {key=flow, remote_ip=flow}
>> Port pf0hpf
>> Interface pf0hpf
>> type: dpdk
>> options: {dpdk-devargs="00:0a.0,representor=[65535]"}
>> Port br-int
>> Interface br-int
>> type: internal
>> Bridge br-phy
>> datapath_type: netdev
>> Port p0
>> Interface p0
>> type: dpdk
>> options: {dpdk-devargs="0000:00:0a.0"}
>> Port br-phy
>> Interface br-phy
>> type: internal
>> ovs_version: "2.17.2"
>>
>> [root@localhost ~]# ip a
>> 21: br-phy: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc
>> fq_codel state UP group default qlen 1000
>> link/ether da:99:52:a3:c0:4b brd ff:ff:ff:ff:ff:ff
>> inet 192.168.10.20/24 scope global br-phy
>> valid_lft forever preferred_lft forever
>> inet6 fe80::d899:52ff:fea3:c04b/64 scope link
>> valid_lft forever preferred_lft forever
>> 22: br-int: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc noop state DOWN
>> group default qlen 1000
>> link/ether 2e:98:7d:95:01:44 brd ff:ff:ff:ff:ff:ff
>>
>> [root@localhost ~]# ovs-ofctl dump-flows br-int
>> cookie=0x0, duration=85007.416s, table=0, n_packets=16375,
>> n_bytes=1359974, in_port=pf0hpf
>> actions=set_tunnel:0x64,load:0xc0a80a14->NXM_NX_TUN_IPV4_SRC[],load:0xc0a80a0a->NXM_NX_TUN_IPV4_DST[],output:vxlan1
>> cookie=0x0, duration=68310.837s, table=0, n_packets=12694,
>> n_bytes=1205960, actions=NORMAL
>> [root@localhost ~]# ovs-ofctl dump-flows br-phy
>> cookie=0x0, duration=85111.116s, table=0, n_packets=17693,
>> n_bytes=2374117, in_port=p0 actions=LOCAL
>> cookie=0x0, duration=146898.807s, table=0, n_packets=17110,
>> n_bytes=2216776, priority=0 actions=NORMAL
>>
>>
>> ### HOST-2, use ovs kernel
>>
>> root@gyw:~# ovs-vsctl show
>> 65c74aa0-a9f4-4009-bc2d-cb06613dfd43
>> Bridge br-phy
>> Port br-phy
>> Interface br-phy
>> type: internal
>> Port enp7s0
>> Interface enp7s0
>> Bridge br-int
>> Port vxlan1
>> Interface vxlan1
>> type: vxlan
>> options: {key="100", local_ip="192.168.10.10",
>> remote_ip="192.168.10.20"}
>> Port veth0
>> Interface veth0
>> Port br-int
>> Interface br-int
>> type: internal
>> ovs_version: "2.17.5"
>>
>> root@gyw:~# ovs-ofctl dump-flows br-phy
>> cookie=0x0, duration=2.250s, table=0, n_packets=0, n_bytes=0,
>> in_port=enp7s0 actions=LOCAL
>> cookie=0x0, duration=69739.938s, table=0, n_packets=13632,
>> n_bytes=1904248, priority=0 actions=NORMAL
>> root@gyw:~# ovs-ofctl dump-flows br-int
>> cookie=0x0, duration=69709.632s, table=0, n_packets=25874,
>> n_bytes=2427556, actions=NORMAL
>> cookie=0x0, duration=36.920s, table=0, n_packets=0, n_bytes=0,
>> in_port=veth0
>> actions=set_tunnel:0x64,load:0xc0a80a0a->NXM_NX_TUN_IPV4_SRC[],load:0xc0a80a14->NXM_NX_TUN_IPV4_DST[],output:vxlan1
>> cookie=0x0, duration=16.354s, table=0, n_packets=0, n_bytes=0,
>> in_port=vxlan1 actions=output:veth0
>>
>>
>> ### start ping
>>
>> ping from namespace of HOST-2, and this namespace is connect to veth0 by
>> veth-pair NIC, to provide a simple description, you could think I send ARP
>> and ICMP request into veth0.
>>
>> Then these packets is vxlan encap and send to HOST-1.
>>
>> Then packets is decap by HOST-1 and send to pf0hpf at last.
>>
>> The pf0hpf is connect to a namespace, and its kernel stack response ARP
>> and ICMP request.
>>
>>
>> ### megaflow of HOST-1
>>
>> [root@localhost ~]# ovs-appctl dpctl/dump-flows
>> flow-dump from the main thread:
>> recirc_id(0),in_port(5),packet_type(ns=0,id=0),eth(src=da:99:52:a3:c0:4b,dst=58:cf:eb:8e:0d:01),eth_type(0x0806),
>> packets:0, bytes:0, offload_packets:0, offload_bytes:0, used:never,
>> actions:4
>> flow-dump from pmd on cpu core: 11
>> tunnel(tun_id=0x64,src=192.168.10.10,dst=192.168.10.20,flags(-df-csum+key)),recirc_id(0),in_port(2),packet_type(ns=0,id=0),eth(src=ba:dc:f5:5c:dc:77,dst=82:4f:d9:d2:8a:65),eth_type(0x0800),ipv4(src=1.1.1.2,dst=1.1.1.1,proto=1,frag=no),
>> packets:157, bytes:15386, offload_packets:0, offload_bytes:0, used:0.052s,
>> actions:3,1
>> recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=58:cf:eb:8e:0d:01,dst=da:99:52:a3:c0:4b),eth_type(0x0800),ipv4(src=192.168.10.10,dst=192.168.10.20,proto=17,frag=no),udp(src=49091,dst=4789),
>> packets:157, bytes:23236, offload_packets:0, offload_bytes:0, used:0.052s,
>> actions:tnl_pop(2)
>> recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=82:4f:d9:d2:8a:65,dst=ba:dc:f5:5c:dc:77),eth_type(0x0800),ipv4(src=1.1.1.1,dst=1.1.1.2,proto=1,tos=0/0x3,frag=no),
>> packets:157, bytes:15386, offload_packets:0, offload_bytes:0, used:0.052s,
>> actions:clone(tnl_push(tnl_port(2),header(size=50,type=4,eth(dst=58:cf:eb:8e:0d:01,src=da:99:52:a3:c0:4b,dl_type=0x0800),ipv4(src=192.168.10.20,dst=192.168.10.10,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=44687,dst=4789,csum=0x0),vxlan(flags=0x8000000,vni=0x64)),out_port(5)),4)
>> recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=58:cf:eb:8e:0d:01,dst=da:99:52:a3:c0:4b),eth_type(0x0806),arp(sip=192.168.10.10,tip=192.168.10.20,op=1),
>> packets:0, bytes:0, offload_packets:0, offload_bytes:0, used:never,
>> actions:5
>>
>> [root@localhost ~]# ovs-appctl dpctl/show
>> netdev@ovs-netdev:
>> lookups: hit:7976 missed:535 lost:1
>> flows: 4
>> port 0: ovs-netdev (tap)
>> port 1: br-int (tap)
>> port 2: vxlan_sys_4789 (vxlan: packet_type=ptap)
>> port 3: pf0hpf (dpdk: configured_rx_queues=1,
>> configured_rxq_descriptors=2048, configured_tx_queues=2,
>> configured_txq_descriptors=2048, dpdk-vf-mac=00:00:00:00:00:00,
>> lsc_interrupt_mode=false, mtu=1500, requested_rx_queues=1,
>> requested_rxq_descriptors=2048, requested_tx_queues=2,
>> requested_txq_descriptors=2048, rx_csum_offload=false, tx_tso_offload=false)
>> port 4: p0 (dpdk: configured_rx_queues=1,
>> configured_rxq_descriptors=2048, configured_tx_queues=2,
>> configured_txq_descriptors=2048, lsc_interrupt_mode=false, mtu=1500,
>> requested_rx_queues=1, requested_rxq_descriptors=2048,
>> requested_tx_queues=2, requested_txq_descriptors=2048,
>> rx_csum_offload=false, tx_tso_offload=false)
>> port 5: br-phy (tap)
>> ```
>>
>>
>> ** 2. Then I start ovs-tcpdump on p0 port on HOST-1 **
>>
>> ```
>> [root@localhost ~]# ovs-tcpdump -i p0
>> dropped privs to tcpdump
>> tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
>> listening on mip0, link-type EN10MB (Ethernet), snapshot length 262144
>> bytes
>> 16:09:39.437730 IP localhost.localdomain.44687 > 192.168.10.10.vxlan:
>> VXLAN, flags [I] (0x08), vni 100
>> IP one.one.one.one > 1.1.1.2: ICMP echo reply, id 37262, seq 1231,
>> length 64
>> 16:09:39.438262 IP localhost.localdomain.44687 > 192.168.10.10.vxlan:
>> VXLAN, flags [I] (0x08), vni 100
>> IP one.one.one.one > 1.1.1.2: ICMP echo reply, id 37262, seq 1231,
>> length 64
>> 16:09:40.438761 IP localhost.localdomain.44687 > 192.168.10.10.vxlan:
>> VXLAN, flags [I] (0x08), vni 100
>> IP one.one.one.one > 1.1.1.2: ICMP echo reply, id 37262, seq 1232,
>> length 64
>>
>> ### topology changes, add mip0 on br-phy, this is reasonable as
>> ovs-tcpdump script do this.
>>
>> [root@localhost ~]# ip a
>> 33: mip0: <BROADCAST,NOARP,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue
>> state UNKNOWN group default qlen 1000
>> link/ether 9e:5f:ca:f4:18:52 brd ff:ff:ff:ff:ff:ff
>> inet6 fe80::9c5f:caff:fef4:1852/64 scope link
>> valid_lft forever preferred_lft forever
>> [root@localhost ~]# ovs-vsctl show
>> 62001a07-219d-48d8-ac1d-fb378a3ad231
>> Bridge br-int
>> datapath_type: netdev
>> Port vxlan1
>> Interface vxlan1
>> type: vxlan
>> options: {key=flow, remote_ip=flow}
>> Port pf0hpf
>> Interface pf0hpf
>> type: dpdk
>> options: {dpdk-devargs="00:0a.0,representor=[65535]"}
>> Port br-int
>> Interface br-int
>> type: internal
>> Bridge br-phy
>> datapath_type: netdev
>> Port p0
>> Interface p0
>> type: dpdk
>> options: {dpdk-devargs="0000:00:0a.0"}
>> Port mip0
>> Interface mip0
>> Port br-phy
>> Interface br-phy
>> type: internal
>> ovs_version: "2.17.2"
>>
>> ### megaflow changes
>>
>> [root@localhost ~]# ovs-appctl dpctl/dump-flows
>> flow-dump from pmd on cpu core: 11
>> tunnel(tun_id=0x64,src=192.168.10.10,dst=192.168.10.20,flags(-df-csum+key)),recirc_id(0),in_port(2),packet_type(ns=0,id=0),eth(src=ba:dc:f5:5c:dc:77,dst=82:4f:d9:d2:8a:65),eth_type(0x0800),ipv4(src=1.1.1.2,dst=1.1.1.1,proto=1,frag=no),
>> packets:418, bytes:40964, offload_packets:0, offload_bytes:0, used:0.918s,
>> actions:3,1
>> recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=02:42:ac:11:00:02,dst=02:42:1a:42:a5:68),eth_type(0x0800),ipv4(src=172.17.0.2,dst=114.114.114.114,proto=17,frag=no),udp(src=34673,dst=53),
>> packets:0, bytes:0, offload_packets:0, offload_bytes:0, used:never,
>> actions:6,5
>> recirc_id(0),in_port(4),packet_type(ns=0,id=0),eth(src=58:cf:eb:8e:0d:01,dst=da:99:52:a3:c0:4b),eth_type(0x0800),ipv4(src=192.168.10.10,dst=192.168.10.20,proto=17,frag=no),udp(src=49091,dst=4789),
>> packets:416, bytes:61568, offload_packets:0, offload_bytes:0, used:0.918s,
>> actions:tnl_pop(2),tnl_pop(2)
>> recirc_id(0),in_port(3),packet_type(ns=0,id=0),eth(src=82:4f:d9:d2:8a:65,dst=ba:dc:f5:5c:dc:77),eth_type(0x0800),ipv4(src=1.1.1.1,dst=1.1.1.2,proto=1,tos=0/0x3,frag=no),
>> packets:418, bytes:40964, offload_packets:0, offload_bytes:0, used:0.917s,
>> actions:clone(tnl_push(tnl_port(2),header(size=50,type=4,eth(dst=58:cf:eb:8e:0d:01,src=da:99:52:a3:c0:4b,dl_type=0x0800),ipv4(src=192.168.10.20,dst=192.168.10.10,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=44687,dst=4789,csum=0x0),vxlan(flags=0x8000000,vni=0x64)),out_port(5)),4,6)
>>
>> ### Got dup ICMP reply on HOST-2's veth0, like this
>>
>> 64 bytes from 1.1.1.1: icmp_seq=13 ttl=64 time=1.169 ms (DUP!)
>> 64 bytes from 1.1.1.1: icmp_seq=14 ttl=64 time=0.939 ms
>> 64 bytes from 1.1.1.1: icmp_seq=14 ttl=64 time=1.037 ms (DUP!)
>> 64 bytes from 1.1.1.1: icmp_seq=15 ttl=64 time=0.965 ms
>> ```
>>
>> Additional, after I stop ovs-tcpdump or link down mip0(ip link set mip0
>> down), there is no DUP IMCP reply.
>>
>>
>> ** 3. Here I have 2 questions **
>>
>> 1. Why megaflow-2 on HOST-1 has two tnl_pop(2) in actions ?
>> 2. Why there are DUP ICMP reply ?
>>
>> So, Why? Thank you.
>>
>>
>>
>>
>>
>> ----
>> Simon Jones
>>
>
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