On 11/22/23 10:05 AM, Stanislav Fomichev wrote:
Commit ef01f4e25c17 ("bpf: restore the ebpf program ID for BPF_AUDIT_UNLOAD
and PERF_BPF_EVENT_PROG_UNLOAD") stopped removing program's id from
idr when the offloaded/bound netdev goes away. I was supposed to
take a look and check in [0], but apparently I did not.
The purpose of idr removal is to avoid BPF_PROG_GET_NEXT_ID returning
stale ids for the programs that have a dead netdev. This functionality
What may be wrong if BPF_PROG_GET_NEXT_ID returns the id?
e.g. If the prog is pinned somewhere, it may be useful to know a prog is still loaded in the system.
bpftool is a bit spooked by those prog ids currently: calling GET_INFO_BY_ID
on those programs returns ENODEV. So we can keep those ids around, but
need some tweaks on the bpftool in this case. LMK if any of you prefer
this option.
I think it is in general useful to improve 'bpftool prog show' to keep going for
the next prog id if possible. May be print an error message after the prog id
and then keep going for the next prog id?
