Hi, why the tail call always can't run successfully, thanks

[bradley-code-again]

Hi, thanks for your wonderful project and sharing. I am trying to run your code but without TRex. I send some dummy GTP packets of N3 and UDP packets of N6 to the running program. The packets can be caught at the entry_point of SEC("xdp_entry_point"), but these packets never can come to SEC("xdp_uplink_entry_point") or SEC("xdp_downlink_entry_point"), and the tail call is always failed.
I am wondering why, and when will you call getUplinkFileDescriptor(). It looks like you don't need to call that to trigger tail call? many thanks for your ideas.

[bradley-code-again]

And I am wondering where is SessionProgram::setup() called? I haven't found it been called anywhere, thanks.

[hrkgarg]

Hi Bradley,

I seem that you have been able to run this project and really gone far in running this. However, I was proceeding as per documentation, and is stuck currently. When using command "make install" inside the docker, I am getting issue in compilation of Configuration.cpp file.
On digging further, I understand that this could be the issue with values provided in env.sh wherein SOCKET_BUFFER_ENABLED=0 is provided. Additionally, few other parameters are also there for GTP and UDP interface names.
Can you help me with providing this information, So, that I can compile and run it in my setup.

Thanks

[navarrothiago]

@bradley-code-again, @hrkgarg, Sorry for the late reply. I appreciate that you have been trying to run. I am without band right now to help you guys. This definitely could have some issue.

@bradley-code-again, did you create the PFCP Session? Check here: https://github.com/navarrothiago/upf-bpf/tree/master/tests/api/requests_body. You can import inside Postman. Usually, three steps are done:

• Setup configuration
• Create the pfcp session

[restart-again]

@hrkgarg, hi, I didn't change anything in env.sh. There is a problem of a cpp file, I changed somewhere manually. I don't remember exactly what I have changes, but it is somewhere auto generated. Read the error carefully, then you may find it.
@navarrothiago, thanks, it works now.