linux-kernel - Re: [PATCH net 6/6] net/sched: qdisc_destroy() old ingress and clsact Qdiscs before grafting

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Date:   Tue, 16 May 2023 17:39:02 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     Vlad Buslov <vladbu@...dia.com>, Jiri Pirko <jiri@...nulli.us>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Peilin Ye <peilin.ye@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        Hillf Danton <hdanton@...a.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH net 6/6] net/sched: qdisc_destroy() old ingress and
 clsact Qdiscs before grafting

On Tue, 16 May 2023 15:58:46 -0700 Peilin Ye wrote:
> > Given Peilin's investigation I think fix without changing core may
> > indeed be hard. I'm not sure if returning -EBUSY when qdisc refcnt
> > is elevated will be appreciated by the users, do we already have
> > similar behavior in other parts of TC?  
> 
> Seems like trying to delete an "in-use" cls_u32 filter returns -EBUSY

I meant -EBUSY due to a race (another operation being in flight).
I think that's different.