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

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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