Comments (5)
jnfoster
commented on August 28, 2024
Yes, please consult the architecture used in these exercises, which is
v1model.p4. It has features to support all of these things.
…-N
On Sat, Sep 2, 2017 at 7:58 PM, NofelYaseen ***@***.***> wrote:
As I understand, the features like broadcast, obtaining buffer queue size
and registers for storing global data are architecture specific.
Right now I am still learning how to make p4 work with mininet and bmv2
simple switch as given in the tutorials.
Do we have any way to do broadcast, obtain buffer queue size (individual
for each port or combined, whatever way is the implementation) and store
global variables in the simple switch?
It might be out of scope here because it is related to mininet, let me
know if its possible to run separate p4 file in each mininet switch. The
way it is set right now /tutorials/P4D2_2017/utils/mininet/* is to pass
P4switch object to mininet.
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NofelYaseen
commented on August 28, 2024
Thank you for the reply, I was able to figure these out. Another thing I would like to know if its possible to retrieve the counter value inside the program.
https://github.com/p4lang/tutorials/tree/master/examples/counter
This example uses CLI to read the counter value. I would like to put the counter value in a packet header.
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jafingerhut
commented on August 28, 2024
@NofelYaseen By design, P4 counters can only be read from the control plane -- the current value of the counters are not visible from the P4 program.
If you want a counter that you can see the value of from within the P4 program, you may implement it using a Register.
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NofelYaseen
commented on August 28, 2024
@jafingerhut Thanks for the suggestion. Is there any function to reset the entire register to 0?
I am using v1model for now:
https://github.com/p4lang/p4c/blob/master/p4include/v1model.p4
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jafingerhut
commented on August 28, 2024
I am not aware of such a function. Using the control plane API for writing each element of the register to 0, and iterating over all indices, should achieve that goal.
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Related Issues (20)
- MRI example，how does the P4 get theinformationof the switch when it is running? HOT 1
- Output format problem of flow table item in mycontroller.py in P4 runtime HOT 2
- IPv6 issue HOT 1
- Connection refused HOT 1
- How to obtain higher-precision processing delay HOT 4
- Get queues length HOT 1
- Test the programs in the exercises folder with PTF HOT 2
- make run mkdir -p build pcaps logs sudo python3 ../../utils/run_exercise.py -t topology.json -j build/ python3: can't open file '/home/chinni12/tutorials/utils/../../utils/run_exercise.py': [Errno 2] No such file or directory make: *** [Makefile:35: run] Error 2 HOT 2
- Building mininet topology. Traceback (most recent call last): File "/home/snsrl3/Documents/tutorials-master/exercises/basic_tunnel/../../utils/run_exercise.py", line 387, in <module> exercise.run_exercise() File "/home/snsrl3/Documents/tutorials-master/exercises/basic_tunnel/../../utils/run_exercise.py", line 195, in run_exercise self.create_network() File "/home/snsrl3/Documents/tutorials-master/exercises/basic_tunnel/../../utils/run_exercise.py", line 256, in create_network self.net = Mininet(topo = self.topo, File "/usr/local/lib/python3.10/dist-packages/mininet/net.py", line 178, in __init__ self.build() HOT 1
- ping issue HOT 1
- n error occurred during make run Traceback (most recent call last): File "../../utils/run_exercise.py", line 28, in <module> import p4runtime_lib.simple_controller File "/home/inspur/p4/tutorials/utils/p4runtime_lib/simple_controller.py", line 22, in <module> from p4.config.v1 import p4info_pb2 ModuleNotFoundError: No module named 'p4.config' HOT 6
- Way to disable the functionality to write the switch logging into a file? HOT 1
- The "behavioral-model" folder can not be found in the P4 tutorial VM HOT 4
- Permission to submit p4_16-mode.el to MELPA HOT 3
- The thrift server did not start in the basic.p4 exercise even when configuring simple_switch_grpc with the "--with-thrift" option. HOT 8
- VM login and password HOT 8
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