linux-kernel - Re: [PATCH] net/sched: cls: Load net classifier modules via alias

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Message-ID: <yerqczxbz6qlrslkfbu6u2emb5esqe7tkrexdbneite2ah2a6i@l6arp7nzyj75>
Date:   Wed, 22 Nov 2023 11:41:05 +0100
From:   Michal Koutný <mkoutny@...e.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Petr Pavlu <ppavlu@...e.cz>, Michal Kubecek <mkubecek@...e.cz>,
        Martin Wilck <mwilck@...e.com>
Subject: Re: [PATCH] net/sched: cls: Load net classifier modules via alias

On Tue, Nov 21, 2023 at 05:37:37PM -0500, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> What's speacial about the "tcf- '' that makes it work
> better for filtering than existing "cls_" prefix?

tcf-foo is an alias.
cls_foo is the canonical name of the kernel module.

request_module() + blacklist (as described in modprobe.d(5)) works only
when calling with the alias. The actual string is not important, being
an alias is the crux.

> What about actions (prefix "act_") etc?

I focused only on "cls_" for the first iteration. Do you want me to look
at other analogous loads?

Thanks,
Michal

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