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P4 on Raspberry Pi for Networking Education
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p4lang/p4pi
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P4Pi (pronounced papi or puppy) allows to design and deploy network data planeswritten in P4 using the Raspberry Pi platform.
Please refer to theP4Pi Wiki Pages.
The following instructions are for experts looking to build their own image. We recommend starting from the generated P4Pi images, as detailed in the wiki.
To setup your Raspberry Pi for the first time, follow the instructions onthe Raspberry Pi Website, using the operating system noted below.
Start from the latest(at the time of writing)64 bit Raspberry Pi OS lite
Update packages
sudo apt-get update&& sudo apt-get full-upgrade -ysudo apt-get install -y gitTo use pcap poll mode driver installlibpcap-dev before compiling dpdk
sudo apt-get install -y libpcap-dev
Add kernel parameters for cpu isolation in/boot/cmdline.txt eg:
isolcpus=2Installbridge-utils
sudo apt-get install -y bridge-utils
Use--vdev net_tap0 inopts_dpdk.cfgStart basic_mirror to create dtap0 then bridge it to eth0/wlan0:
sudo brctl addbr br0sudo brctl addif br0<eth0/wlan0> dtap0sudo ifconfig br0 up
sudo apt-get install -y hostapd dnsmasqsudo systemctl unmask hostapd
Append to/etc/dhcpcd.conf
interface wlan0 static ip_address=192.168.4.1/24 nohook wpa_supplicant
Replace/etc/dnsmasq.conf with
interface=wlan0dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h
Edit/etc/hostapd/hostapd.conf: (fiddle with channel if needed, unfortunately the auto channel scan is not supported by the hardware)
country_code=HUinterface=wlan0ssid=<NameOfNetwork>hw_mode=achannel=48ieee80211d=1ieee80211n=1ieee80211ac=1wmm_enabled=1macaddr_acl=0auth_algs=1ignore_broadcast_ssid=0wpa=2wpa_passphrase=<Password>wpa_key_mgmt=WPA-PSKwpa_pairwise=TKIPrsn_pairwise=CCMP
sudo systemctl start hostapd# or enable and restartOn the pc add a manual arp entry for a non-existant destination in the same subnet and run iperf with that as a destination eg
sudo arp -s 192.168.4.10 00:50:ba:85:85:ca
export P4PI=/root/t4p4s/piexport GRPC=/root/t4p4s/grpcexport GRPCPP=/root/t4p4s/P4Runtime_GRPCPPBy default the following command is executed on start-up byp4pi-setup.service.
sudo p4pi-setup
It creates two virtual Ethernet devices pairs and two bridge interfacesare used in T4P4S examples to process packets.
In order to add the wireless access point interface to a bridge used T4P4S,uncomment the following line in/etc/hostapd/hostapd.conf:
#bridge=br0With pcap PMD
baseline:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 13.1 GBytes 941 Mbits/sec 1 sender[ 5] 0.00-120.00 sec 13.1 GBytes 941 Mbits/sec receiverbmv2:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 639 MBytes 44.7 Mbits/sec 19456 sender[ 5] 0.00-120.00 sec 639 MBytes 44.7 Mbits/sec receiverdpdk (with hugepages and isolated cpu core)
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 1.18 GBytes 84.6 Mbits/sec 2478 sender[ 5] 0.00-120.01 sec 1.18 GBytes 84.5 Mbits/sec receiverT4P4S:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 973 MBytes 68.0 Mbits/sec 2965 sender[ 5] 0.00-120.02 sec 970 MBytes 67.8 Mbits/sec receiverT4P4S with Tap PMD:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 2.57 GBytes 184 Mbits/sec 522 sender[ 5] 0.00-120.04 sec 2.57 GBytes 184 Mbits/sec receiverBaseline:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 827 MBytes 57.8 Mbits/sec 0 sender[ 5] 0.00-120.02 sec 824 MBytes 57.6 Mbits/sec receiverT4P4s:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 396 MBytes 27.7 Mbits/sec 401 sender[ 5] 0.00-120.06 sec 393 MBytes 27.5 Mbits/sec receiverT4P4S with Tap PMD:
[ ID] Interval Transfer Bitrate Retr[ 5] 0.00-120.00 sec 415 MBytes 29.0 Mbits/sec 1 sender[ 5] 0.00-120.09 sec 413 MBytes 28.8 Mbits/sec receiverAbout
P4 on Raspberry Pi for Networking Education