netdev - Re: [PATCH bpf-next 3/8] bpf: add comments to interpret bpf

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Message-ID: <CAEf4BzbX77FFcSRR70GVKEViM3eD6zznFP5_tg_cVp5oN=JwAQ@mail.gmail.com>
Date:   Tue, 12 May 2020 15:21:41 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 3/8] bpf: add comments to interpret bpf_prog
 return values

On Tue, May 12, 2020 at 8:53 AM Yonghong Song <yhs@...com> 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 <yhs@...com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

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