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hwid hp
! cpu_port
int eth0 eth - 127.0.0.1 20001 127.0.0.1 20002
! freerouter control port for message
tcp2vrf 9080 v1 9080
! freerouter cli
tcp2vrf 2323 v1 23
! launch a process called "veth0" that actually link to veth0b
! cmd: ip link add veth0a type veth peer name veth0b
proc veth0 /root/freertr/bin/pcapInt.bin veth0a 20002 127.0.0.1 20001 127.0.0.1
proc p4emu /root/freertr/bin/p4dpdk.bin --vdev=net_af_packet0,iface=veth0b 127.0.0.1 9080 1

Let's spend some times on this hardware configuration file, as you might have notice there are additional interesting lines worth to mention:

• proc <process-name>

It is possible within freeRouter startup to launch processes. We use here this feature to start control plane / dataplane communication via veth pair: veth0a and veth0b and also P4Emu/dpdk, p4dpdk.bin packet processing backend.

• proc p4emu /root/freertr/bin/p4dpdk.bin --vdev=net_af_packet0,iface=veth0b 127.0.0.1 9080 1

In dpdk, by default dpdk interfaces have port_ids that are sequentially allocated and in the order of appearance in dpdk-devbind --status output usually sorted by pci_id. In the previous output interface enp0s3 has port_id #0 and in dpdk veth0b (CPU_PORT has alwasy the last port_id beside dpdk data port_id, so here it is 1. If for exaplem we dedicate enp0s3, enp0s8, enp0s9, enp0s10 in virtualbox the command would have been:

proc p4emu /root/freertr/bin/p4dpdk.bin --vdev=net_af_packet0,iface=veth0b 127.0.0.1 9080 4

enp0s3 would be: #0 with pci_id: 00:03.0

enp0s8 would be: #1 with pci_id: 00:08.0

enp0s9 would be: #2 with pci_id: 00:09.0

enp0s10 would be: #3 with pci_id: 00:0a.0

hostname dpdk-freerouter
buggy
!
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet0
 description freerouter@P4_CPU_PORT[veth0a]
 no shutdown
 no log-link-change
 exit
!
interface sdn1
 description freerouter@P4_CPU_PORT[enp0s3]
 mtu 1500
 vrf forwarding v1
 ipv4 address 192.168.0.131 255.255.255.0
 ipv6 address 2a01:e0a:159:2850::666 ffff:ffff:ffff:ffff::
 ipv6 enable
 no shutdown
 no log-link-change
 exit
!
!
!
!
!
!
!
!
!
!
!
!
!
!
server telnet telnet
 security protocol telnet
 no exec authorization
 no login authentication
 vrf v1
 exit
!
server p4lang p4
 export-vrf v1 1
 export-port sdn1 0 0
 interconnect ethernet0
 vrf v1
 exit
!
!
end

java -jar lib/rtr.jar routersc dpdk-focal-1-hw.txt dpdk-focal-1-sw.txt
info cfg.cfgInit.doInit:cfgInit.java:556 booting
info cfg.cfgInit.doInit:cfgInit.java:680 initializing hardware
info cfg.cfgInit.executeHWcommands:cfgInit.java:469 2:! cpu_port
info cfg.cfgInit.executeHWcommands:cfgInit.java:469 4:! freerouter control port for message
info cfg.cfgInit.executeHWcommands:cfgInit.java:469 6:! freerouter cli
info cfg.cfgInit.executeHWcommands:cfgInit.java:469 8:! launch a process called "veth0" that actually link to veth0b
info cfg.cfgInit.executeHWcommands:cfgInit.java:469 9:! cmd: ip link add veth0a type veth peer name veth0b
info cfg.cfgInit.doInit:cfgInit.java:687 applying defaults
info cfg.cfgInit.doInit:cfgInit.java:695 applying configuration
info cfg.cfgInit.doInit:cfgInit.java:721 done
welcome
line ready
dpdk-freertr-1#