From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Song Liu <songliubraving@fb.com>
Cc: Pedro Tammela <pctammela@gmail.com>,
Pedro Tammela <pctammela@mojatatu.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>, Martin Lau <kafai@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Shuah Khan <shuah@kernel.org>,
Joe Stringer <joe@cilium.io>,
Quentin Monnet <quentin@isovalent.com>,
Yang Li <yang.lee@linux.alibaba.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH bpf-next] libbpf: Add '_wait()' and '_nowait()' macros for 'bpf_ring_buffer__poll()'
Date: Wed, 31 Mar 2021 11:59:27 -0700 [thread overview]
Message-ID: <CAEf4BzYWoczwZwG1qKhZc8jEfr4EQAwY76AaD_LuJsM1ohVJkQ@mail.gmail.com> (raw)
In-Reply-To: <BCF68ADA-5114-4E61-87DE-D5E5C946BC6F@fb.com>
On Mon, Mar 29, 2021 at 9:28 AM Song Liu <songliubraving@fb.com> wrote:
>
>
>
> > On Mar 28, 2021, at 9:10 AM, Pedro Tammela <pctammela@gmail.com> wrote:
> >
> > 'bpf_ring_buffer__poll()' abstracts the polling method, so abstract the
> > constants that make the implementation don't wait or wait indefinetly
> > for data.
> >
> > Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
> > ---
> > tools/lib/bpf/libbpf.h | 3 +++
> > tools/testing/selftests/bpf/benchs/bench_ringbufs.c | 2 +-
> > tools/testing/selftests/bpf/prog_tests/ringbuf.c | 6 +++---
> > tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c | 4 ++--
> > 4 files changed, 9 insertions(+), 6 deletions(-)
> >
> > diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> > index f500621d28e5..3817d84f91c6 100644
> > --- a/tools/lib/bpf/libbpf.h
> > +++ b/tools/lib/bpf/libbpf.h
> > @@ -540,6 +540,9 @@ LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
> > LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
> > LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb);
> >
> > +#define ring_buffer__poll_wait(rb) ring_buffer__poll(rb, -1)
> > +#define ring_buffer__poll_nowait(rb) ring_buffer__poll(rb, 0)
>
> I think we don't need ring_buffer__poll_wait() as ring_buffer__poll() already
> means "wait for timeout_ms".
>
> Actually, I think ring_buffer__poll() is enough. ring_buffer__poll_nowait()
> is not that useful either.
>
I agree. I think adding a comment to the API itself might be useful
specifying 0 and -1 as somewhat special cases.
> Thanks,
> Song
>
next prev parent reply other threads:[~2021-03-31 19:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-28 16:10 [PATCH bpf-next] bpf: add 'BPF_RB_MAY_WAKEUP' flag Pedro Tammela
2021-03-28 16:10 ` [PATCH bpf-next] bpf: check flags in 'bpf_ringbuf_discard()' and 'bpf_ringbuf_submit()' Pedro Tammela
2021-03-29 16:10 ` Song Liu
2021-03-30 14:22 ` Pedro Tammela
2021-03-30 18:12 ` Song Liu
2021-03-31 6:58 ` Andrii Nakryiko
2021-03-28 16:10 ` [PATCH bpf-next] libbpf: Add '_wait()' and '_nowait()' macros for 'bpf_ring_buffer__poll()' Pedro Tammela
2021-03-29 16:28 ` Song Liu
2021-03-31 18:59 ` Andrii Nakryiko [this message]
2021-03-29 16:05 ` [PATCH bpf-next] bpf: add 'BPF_RB_MAY_WAKEUP' flag Song Liu
2021-03-31 6:53 ` Andrii Nakryiko
2021-04-03 13:34 ` Pedro Tammela
2021-04-03 15:51 ` Andrii Nakryiko
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