Path of UDP packet in linux kernel

Question

I want to find the path of a UDP packet in the Linux kernel. For this, I want to read up on some documentation ( I have this so far, which is for TCP) and then have some pri

Answer 1

If you prefer a more visual way, try flame-grahps. Here is an example of UDP transmit flow (using netperf to transmit UDP packets):

And here is the same graph zoomed-in on udp_send_skb:

You can do the same for any relevant flow in the kernel. You can also search for specific functions or key-words and zoom in/out. This also gives you an idea of the heavier functions in the flow.

Hope this helps.