Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> writes: >> > Currently fentry/fexit/freplace progs have single prog->aux->linked_prog pointer. >> > It just needs to become a linked list. >> > The api extension could be like this: >> > bpf_raw_tp_open(prog_fd, attach_prog_fd, attach_btf_id); >> > (currently it's just bpf_raw_tp_open(prog_fd)) >> > The same pair of (attach_prog_fd, attach_btf_id) is already passed into prog_load >> > to hold the linked_prog and its corresponding btf_id. >> > I'm proposing to extend raw_tp_open with this pair as well to >> > attach existing fentry/fexit/freplace prog to another target. >> > Internally the kernel verify that btf of current linked_prog >> > exactly matches to btf of another requested linked_prog and >> > if they match it will attach the same prog to two target programs (in case of freplace) >> > or two kernel functions (in case of fentry/fexit). >> >> API-wise this was exactly what I had in mind as well. > > perfect! Hi Alexei I don't suppose you've had a chance to whip up a patch for this, have you? :) -Toke
