On Tue, May 12, 2020 at 8:53 AM Yonghong Song <[email protected]> wrote: > > Add a short comment in bpf_iter_run_prog() function to > explain how bpf_prog return value is converted to > seq_ops->show() return value: > bpf_prog return seq_ops()->show() return > 0 0 > 1 -EAGAIN > > When show() return value is -EAGAIN, the current > bpf_seq_read() will end. If the current seq_file buffer > is empty, -EAGAIN will return to user space. Otherwise, > the buffer will be copied to user space. > In both cases, the next bpf_seq_read() call will > try to show the same object which returned -EAGAIN > previously. > > Signed-off-by: Yonghong Song <[email protected]> > ---
Acked-by: Andrii Nakryiko <[email protected]> [...]
