counter

Counter

+--+      +--+     ++-+
|h1+------+  +-----+h2+
+--+      +  +     +--+
          +s1+
+--+      +  +     ++-+
|h3+------+  +-----+h4+
+--+      +-++     +--+

Simple example of direct and indirect counters that count the packets and bytes arriving at each ingress port.

How to run

Run the topology, by starting either the direct or indirect examples:

sudo p4run --config p4app_direct.json

sudo p4run --config p4app_indirect.json

Testing the counters

Use e.g. ping to send packets. The switch will count all packets and then drop them (because forwarding is not implemented).

Access counter values (for direct and indirect counters):

$ simple_switch_CLI --thrift-port 9090
$ RuntimeCmd: counter_read MyIngress.port_counter 0

(where the 1 is the entry handle for a given table entry. For example the first entry added in a table will have a handle of 0)

Using a simple control plane to read the counters

The following controller program will establish a connection with the switch and through a thrift API it will read all the counter values.

$ python read_counters.py [direct/indirect]