program tcp_close: map events: map create without BTF: invalid argument

[zhuanshenlikai]

I try the tcprtt from the examples, but return these errors. I use linux version of ubuntu(5.4.0-121-generic).

Is there anything wrong?

[brycekahle]

5.4 is not new enough for that example. The helper bpf_skc_to_tcp_sock is not available until 5.9 and the fentry program type was added in 5.5.

[brycekahle]

Oh, and ring buffer was added in 5.8.

[zhuanshenlikai]

thanks