linux-kernel - Re: [PATCH v5 net 2/6] net/sched: sch_clsact: Only create under TC_H

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Message-ID: <CAM0EoMnwEUdjpA55xtK67iWAH=fh-QUvdMW9Ma0nmG_B8N=s+Q@mail.gmail.com>
Date:   Wed, 24 May 2023 11:58:38 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Pedro Tammela <pctammela@...atatu.com>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Peilin Ye <peilin.ye@...edance.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Vlad Buslov <vladbu@...lanox.com>,
        Hillf Danton <hdanton@...a.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH v5 net 2/6] net/sched: sch_clsact: Only create under TC_H_CLSACT

On Wed, May 24, 2023 at 11:38 AM Pedro Tammela <pctammela@...atatu.com> wrote:
>
> On 23/05/2023 22:18, Peilin Ye wrote:
> > From: Peilin Ye <peilin.ye@...edance.com>
> >
> > clsact Qdiscs are only supposed to be created under TC_H_CLSACT (which
> > equals TC_H_INGRESS).  Return -EOPNOTSUPP if 'parent' is not
> > TC_H_CLSACT.
> >
> > Fixes: 1f211a1b929c ("net, sched: add clsact qdisc")
> > Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
>
> Tested-by: Pedro Tammela <pctammela@...atatu.com>
>

Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>

cheers,
jamal
> > ---
> > change in v5:
> >    - avoid underflowing @egress_needed_key in ->destroy(), reported by
> >      Pedro
> >
> > change in v3, v4:
> >    - add in-body From: tag
> >
> >   net/sched/sch_ingress.c | 6 ++++++
> >   1 file changed, 6 insertions(+)
> >
> > diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
> > index f9ef6deb2770..35963929e117 100644
> > --- a/net/sched/sch_ingress.c
> > +++ b/net/sched/sch_ingress.c
> > @@ -225,6 +225,9 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
> >       struct net_device *dev = qdisc_dev(sch);
> >       int err;
> >
> > +     if (sch->parent != TC_H_CLSACT)
> > +             return -EOPNOTSUPP;
> > +
> >       net_inc_ingress_queue();
> >       net_inc_egress_queue();
> >
> > @@ -254,6 +257,9 @@ static void clsact_destroy(struct Qdisc *sch)
> >   {
> >       struct clsact_sched_data *q = qdisc_priv(sch);
> >
> > +     if (sch->parent != TC_H_CLSACT)
> > +             return;
> > +
> >       tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
> >       tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
> >
>