On Thu, 16 Jan 2020, Maciej Fijalkowski wrote: > > I see that optlen is a global variable. This line might be valid but > you're using iproute2's loader for your XDP program, right? AFAIK it > doesn't have support for BPF global variables, only libbpf does (Daniel, > Andrii? is that true?). > move optlen to local variable resolves the iproute2 loading problem. I tried libbpf way (xdp-loader load enp3s0 tcp_option.o) from https://github.com/xdp-project/xdp-tools to load the program, but it failed with "Couldn't load BPF program: Relocation failed". I will have more detail in email respond to Toke.
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