Hi Pedro,
On Tue, Apr 6, 2021 at 11:58 AM Pedro Tammela <pctammela@xxxxxxxxx> wrote:
>
> In 'bpf_ringbuf_reserve()' we require the flag to '0' at the moment.
>
> For 'bpf_ringbuf_{discard,submit,output}' a flag of '0' might send a
> notification to the process if needed.
>
> Signed-off-by: Pedro Tammela <pctammela@xxxxxxxxxxxx>
> ---
> include/uapi/linux/bpf.h | 7 +++++++
> tools/include/uapi/linux/bpf.h | 7 +++++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 49371eba98ba..8c5c7a893b87 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -4061,12 +4061,15 @@ union bpf_attr {
> * of new data availability is sent.
> * If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
> * of new data availability is sent unconditionally.
> + * If **0** is specified in *flags*, notification
> + * of new data availability is sent if needed.
Maybe a trivial question, but what does "if needed" mean? Does that
mean "when the buffer is full"?
