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authorDave Barach <dave@barachs.net>2021-01-20 12:20:13 -0500
committerDave Wallace <dwallacelf@gmail.com>2021-01-22 14:02:27 +0000
commitb8f6122b4f4c828dee103d1f3116d27e6e3e6f3a (patch)
tree959988ea721b6539ab4c9e28ccc97d77eb3dce2b /docs/usecases/trafficgen.md
parent9fecbe1841dbdb6d29fbeae4c3d7ebc728e9692a (diff)
docs: vpp stateless traffic generator
Add a use-case writeup. Type: docs Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: Ib6e79e80455edbdeedcc96943dd98f16c57c559e
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+Vpp Stateless Traffic Generation
+================================
+
+It's simple to configure vpp as a high-performance stateless traffic
+generator. A couple of vpp worker threads running on an older system
+can easily generate 20 MPPS' worth of traffic.
+
+In the configurations shown below, we connect a vpp traffic generator
+and a vpp UUT using two 40 gigabit ethernet ports on each system:
+
+```
+ +-------------------+ +-------------------+
+ | traffic generator | | UUT |
+ | port 0 | <=======> | port 0 |
+ | 192.168.40.2/24 | | 192.168.40.1/24 |
+ +-------------------+ +-------------------+
+
+ +-------------------+ +-------------------+
+ | traffic generator | | UUT |
+ | port 1 | <=======> | port 1 |
+ | 192.168.41.2/24 | | 192.168.41.1/24 |
+ +-------------------+ +-------------------+
+```
+
+Traffic Generator Setup Script
+------------------------------
+
+```
+ set int ip address FortyGigabitEthernet2/0/0 192.168.40.2/24
+ set int ip address FortyGigabitEthernet2/0/1 192.168.41.2/24
+ set int state FortyGigabitEthernet2/0/0 up
+ set int state FortyGigabitEthernet2/0/1 up
+
+ comment { send traffic to the VPP UUT }
+
+ packet-generator new {
+ name worker0
+ worker 0
+ limit 0
+ rate 1.2e7
+ size 128-128
+ tx-interface FortyGigabitEthernet2/0/0
+ node FortyGigabitEthernet2/0/0-output
+ data { IP4: 1.2.40 -> 3cfd.fed0.b6c8
+ UDP: 192.168.40.10 -> 192.168.50.10
+ UDP: 1234 -> 2345
+ incrementing 114
+ }
+ }
+
+ packet-generator new {
+ name worker1
+ worker 1
+ limit 0
+ rate 1.2e7
+ size 128-128
+ tx-interface FortyGigabitEthernet2/0/1
+ node FortyGigabitEthernet2/0/1-output
+ data { IP4: 1.2.4 -> 3cfd.fed0.b6c9
+ UDP: 192.168.41.10 -> 192.168.51.10
+ UDP: 1234 -> 2345
+ incrementing 114
+ }
+ }
+
+ comment { delete return traffic on sight }
+
+ ip route add 192.168.50.0/24 via drop
+ ip route add 192.168.51.0/24 via drop
+```
+
+Note 1: the destination MAC addresses shown in the configuration (e.g.
+3cfd.fed0.b6c8 and 3cfd.fed0.b6c9) **must** match the vpp UUT port MAC
+addresses.
+
+Note 2: this script assumes that /etc/vpp/startup.conf and/or the
+command-line in use specifies (at least) two worker threads. Uncomment
+"workers 2" in the cpu configuration section of /etc/vpp/startup.conf:
+
+```
+ ## Specify a number of workers to be created
+ ## Workers are pinned to N consecutive CPU cores while skipping "skip-cores" CPU core(s)
+ ## and main thread's CPU core
+ workers 2
+```
+
+Any plausible packet generator script - including one which replays
+pcap captures - can be used.
+
+
+UUT Setup Script
+----------------
+
+The vpp UUT uses a couple of static routes to forward traffic back to
+the traffic generator:
+
+```
+ set int ip address FortyGigabitEthernet2/0/0 192.168.40.1/24
+ set int ip address FortyGigabitEthernet2/0/1 192.168.41.1/24
+ set int state FortyGigabitEthernet2/0/0 up
+ set int state FortyGigabitEthernet2/0/1 up
+
+ ip route add 192.168.50.10/32 via 192.168.41.2
+ ip route add 192.168.51.10/32 via 192.168.40.2
+```