On Sun, Mar 28, 2021 at 8:03 AM Andrii Nakryiko
<andrii.nakryiko@xxxxxxxxx> wrote:
[...]
> >
> > struct {
> > __uint(type, BPF_MAP_TYPE_ARRAY);
> > - __uint(max_entries, 4096);
> > + __uint(max_entries, PAGE_SIZE);
>
>
> so you can set map size at runtime before bpf_object__load (or
> skeleton's load) with bpf_map__set_max_entries. That way you don't
> have to do any assumptions. Just omit max_entries in BPF source code,
> and always set it in userspace.
Will it work for ringbuf_multi? If I just set max_entries for ringbuf1
and ringbuf2 that way, it gives me
libbpf: map 'ringbuf_arr': failed to create inner map: -22
libbpf: map 'ringbuf_arr': failed to create: Invalid argument(-22)
libbpf: failed to load object 'test_ringbuf_multi'
libbpf: failed to load BPF skeleton 'test_ringbuf_multi': -22
test_ringbuf_multi:FAIL:skel_load skeleton load failed
