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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