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

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Date:   Wed, 22 Nov 2023 10:55:29 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Michal Koutný <mkoutny@...e.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 Wed, Nov 22, 2023 at 10:33 AM Jamal Hadi Salim <jhs@...atatu.com> wrote:
>
> On Wed, Nov 22, 2023 at 5:41 AM Michal Koutný <mkoutny@...e.com> wrote:
> >
> > 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.
> >
>
> Thanks for the explanation.
>

Out of curiosity - how did you end up looking at this? Was there
someone who complained or is it just standard procedure to add aliases
to all modules and it was on a todo list somewhere?

cheers,
jamal

> > > 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?
>
> Yes, look at act_ and sch_
>
> cheers,
> jamal
> > Thanks,
> > Michal