netdev - Re: [PATCH v2 3/5] bpf: Expose bpf_sk_storage

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Message-ID: <CACYkzJ6rPmuOQbHYJyDGS77WFqZ1igHnuXyR=Go8Vpw=_h-TDg@mail.gmail.com>
Date:   Thu, 19 Nov 2020 23:05:10 +0100
From:   KP Singh <kpsingh@...omium.org>
To:     Florent Revest <revest@...omium.org>
Cc:     bpf <bpf@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Florent Revest <revest@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] bpf: Expose bpf_sk_storage_* to iterator programs

On Thu, Nov 19, 2020 at 5:27 PM Florent Revest <revest@...omium.org> wrote:
>
> From: Florent Revest <revest@...gle.com>
>
> Iterators are currently used to expose kernel information to userspace
> over fast procfs-like files but iterators could also be used to
> manipulate local storage. For example, the task_file iterator could be
> used to initialize a socket local storage with associations between
> processes and sockets or to selectively delete local storage values.
>
> This exposes both socket local storage helpers to all iterators.
> Alternatively we could expose it to only certain iterators with strcmps
> on prog->aux->attach_func_name.

Since you mentioned the alternative here, maybe you can also
explain why you chose the current approach.