On 07/03/2023 09:52, Dominic wrote: > Hi, I have multiple eBPF programs compiled into a single skeleton file > and I need a way to delay loading of one of the programs. > > I am aware of `bpf_program__set_autoload()` API but once an object is > loaded using `bpf_object__load()`, there are no APIs to selectively > load a program (bpf_prog_load() has been deprecated). Calling > bpf_object__load() again fails. > > Wondering if there are any options to achieve the above mentioned behavior. > I ran into a similar problem recently; in my case, the problem was that one of the functions that one of my BPF programs attached to could be inlined on some kernel versions. As a result the whole skeleton would fail on auto-attach. If that is the problem you are facing, you can try a full load/attach and if that fails, start again - you'll need to destroy the skeleton and go back to the open if I remember correctly - and mark the problematic program using bpf_program__set_autoload() to false the second time round. Failing that, is separating into two skeletons and using bpf_map__reuse_fd() to share fds across both skeletons feasible? If not, can you provide more details on why the delayed load is required - that might help us figure out a solution. One thing to figure out - is it definitely delayed load you need, or just delayed attach? Thanks! Alan > Thanks & Regards, > Dominic
