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

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Message-ID: <ZF2EK3I2GDB5rZsM@C02FL77VMD6R.googleapis.com>
Date:   Thu, 11 May 2023 17:11:23 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     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>,
        Vlad Buslov <vladbu@...lanox.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 Thu, May 11, 2023 at 04:46:33PM -0700, Peilin Ye wrote:
> On Thu, May 11, 2023 at 04:20:23PM -0700, Jakub Kicinski wrote:
> > > But I see your point, thanks for the suggestion!  I'll try ->init() and
> > > create v2.
> >
> > ->init() may be too early, aren't there any error points which could
> > prevent the Qdisc from binding after ->init() was called?
>
> You're right, it's in qdisc_create(), argh...

->destroy() is called for all error points between ->init() and
dev_graft_qdisc().  I'll try handling it in ->destroy().

Thanks,
Peilin Ye