linux-kernel - Re: [PATCH bpf-next] bpf: add 'BPF_RB_MAY

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Date:   Mon, 29 Mar 2021 16:05:14 +0000
From:   Song Liu <songliubraving@...com>
To:     Pedro Tammela <pctammela@...il.com>
CC:     Pedro Tammela <pctammela@...atatu.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Joe Stringer <joe@...ium.io>,
        Quentin Monnet <quentin@...valent.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next] bpf: add 'BPF_RB_MAY_WAKEUP' flag



> On Mar 28, 2021, at 9:10 AM, Pedro Tammela <pctammela@...il.com> wrote:
> 
> The current way to provide a no-op flag to 'bpf_ringbuf_submit()',
> 'bpf_ringbuf_discard()' and 'bpf_ringbuf_output()' is to provide a '0'
> value.
> 
> A '0' value might notify the consumer if it already caught up in processing,
> so let's provide a more descriptive notation for this value.
> 
> Signed-off-by: Pedro Tammela <pctammela@...atatu.com>

Acked-by: Song Liu <songliubraving@...com>