On Wed, May 6, 2020 at 10:40 PM Yonghong Song <yhs@xxxxxx> wrote: > > A bpf_iter program is a tracing program with attach type > BPF_TRACE_ITER. The load attribute > attach_btf_id > is used by the verifier against a particular kernel function, > which represents a target, e.g., __bpf_iter__bpf_map > for target bpf_map which is implemented later. > > The program return value must be 0 or 1 for now. > 0 : successful, except potential seq_file buffer overflow > which is handled by seq_file reader. > 1 : request to restart the same object > > In the future, other return values may be used for filtering or > teminating the iterator. > > Signed-off-by: Yonghong Song <yhs@xxxxxx> > --- Looks good. Acked-by: Andrii Nakryiko <andriin@xxxxxx> > include/linux/bpf.h | 3 +++ > include/uapi/linux/bpf.h | 1 + > kernel/bpf/bpf_iter.c | 36 ++++++++++++++++++++++++++++++++++ > kernel/bpf/verifier.c | 21 ++++++++++++++++++++ > tools/include/uapi/linux/bpf.h | 1 + > 5 files changed, 62 insertions(+) > [...]
