netdev - Re: [PATCH net v1] net/sched: taprio: Fix crash when adding child qdisc

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Date:   Thu, 6 Oct 2022 09:38:32 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "yannick.vignon@....com" <yannick.vignon@....com>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
Subject: Re: [PATCH net v1] net/sched: taprio: Fix crash when adding child
 qdisc

On Tue, Oct 04, 2022 at 03:41:30PM -0700, Vinicius Costa Gomes wrote:
> I was afraid that this this would happen. I need to stop, grab some tea
> and think very carefully how to simplify the lifetime handling of the
> children qdiscs. It has become complicated now that the
> offloaded/not-offloaded modes are very different internally.

Truth be told, it's not like the problem Yannick described in commit
13511704f8d7 ("net: taprio offload: enforce qdisc to netdev queue
mapping") is unique only to the offloaded taprio, but I just don't know
enough about qdiscs to see a different design than what is currently
implemented.