netdev - Re: [PATCH net 2/2] net/sched: flower: fix error handler on replace

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Message-ID: <87mt2kqkke.fsf@nvidia.com>
Date: Thu, 4 May 2023 16:40:21 +0300
From: Vlad Buslov <vladbu@...dia.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: Ivan Vecera <ivecera@...hat.com>, Simon Horman
	<simon.horman@...igine.com>, Pedro Tammela <pctammela@...atatu.com>,
	<davem@...emloft.net>, <netdev@...r.kernel.org>, <jhs@...atatu.com>,
	<xiyou.wangcong@...il.com>, <jiri@...nulli.us>, <marcelo.leitner@...il.com>,
	<paulb@...dia.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net 2/2] net/sched: flower: fix error handler on replace

On Tue 02 May 2023 at 19:44, Jakub Kicinski <kuba@...nel.org> wrote:
> On Fri, 28 Apr 2023 14:03:19 +0300 Vlad Buslov wrote:
>> Note that with these changes (both accepted patch and preceding diff)
>> you are exposing filter to dapapath access (datapath looks up filter via
>> hash table, not idr) with its handle set to 0 initially and then resent
>> while already accessible. After taking a quick look at Paul's
>> miss-to-action code it seems that handle value used by datapath is taken
>> from struct tcf_exts_miss_cookie_node not from filter directly, so such
>> approach likely doesn't break anything existing, but I might have missed
>> something.
>
> Did we deadlock in this discussion, or the issue was otherwise fixed?

>From my side I explained why in my opinion Ivan's fix doesn't cover all
cases and my approach is better overall. Don't know what else to discuss
since it seems that everyone agreed.