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

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Message-ID: <5fda8703-9220-4abd-7859-0af973d0d1d7@mojatatu.com>
Date:   Wed, 24 May 2023 12:38:07 -0300
From:   Pedro Tammela <pctammela@...atatu.com>
To:     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>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     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 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>

> ---
> 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);
>