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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