PTF agent on remote host is unable to receive messages larger than 4096 bytes

[senthil-nexthop]

The PTF agent on the remote host opens a raw socket to received packets from the PTF tester and the max size of packets it can receive on the socket is limited to 4096 bytes.

The recv() call in the agent has an upper bound of 4096, as seen here:

ptf/ptf_nn/ptf_nn_agent.py

Line 338 in 6af7508

msg = afpacket.recv(self.socket, 4096)

                while True:
                    msg = afpacket.recv(self.socket, 4096)
                    self.received(msg)

This limits the ability to test jumbo packets which can be as big as 9216 bytes. Can the default be set to 9216 bytes?

[vgurevich]

Dear @senthil-nexthop ,

I do not see why not. Try it and if this works for you you can submit a pull request, which can come in a couple of different forms:

1. You can change one magic number (4096) to another (9216)
2. You can make it a predefined test parameter (accessible via test_params infrastructure, provide a default value and document the change.

Happy hacking,
Vladimir

[senthil-nexthop]

Hi Vladimir,

I'll add a test_param and set the default to 9216, as that would help others who want a even bigger receive buffer. Will raise a PR.

Thanks!