netdev - Re: [patch net-next] net: sched: move block device tracking into tcf_block_get/put

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Date: Thu, 4 Jan 2024 16:32:15 +0200
From: Ido Schimmel <idosch@...sch.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, jhs@...atatu.com,
	xiyou.wangcong@...il.com, victor@...atatu.com,
	pctammela@...atatu.com, mleitner@...hat.com, vladbu@...dia.com,
	paulb@...dia.com
Subject: Re: [patch net-next] net: sched: move block device tracking into
 tcf_block_get/put_ext()

On Thu, Jan 04, 2024 at 01:58:44PM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
> 
> Inserting the device to block xarray in qdisc_create() is not suitable
> place to do this. As it requires use of tcf_block() callback, it causes
> multiple issues. It is called for all qdisc types, which is incorrect.
> 
> So, instead, move it to more suitable place, which is tcf_block_get_ext()
> and make sure it is only done for qdiscs that use block infrastructure
> and also only for blocks which are shared.
> 
> Symmetrically, alter the cleanup path, move the xarray entry removal
> into tcf_block_put_ext().
> 
> Fixes: 913b47d3424e ("net/sched: Introduce tc block netdev tracking infra")
> Reported-by: Ido Schimmel <idosch@...dia.com>
> Closes: https://lore.kernel.org/all/ZY1hBb8GFwycfgvd@shredder/
> Reported-by: Kui-Feng Lee <sinquersw@...il.com>
> Closes: https://lore.kernel.org/all/ce8d3e55-b8bc-409c-ace9-5cf1c4f7c88e@gmail.com/
> Reported-and-tested-by: syzbot+84339b9e7330daae4d66@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/all/0000000000007c85f5060dcc3a28@google.com/
> Reported-and-tested-by: syzbot+806b0572c8d06b66b234@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/all/00000000000082f2f2060dcc3a92@google.com/
> Reported-and-tested-by: syzbot+0039110f932d438130f9@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/all/0000000000007fbc8c060dcc3a5c@google.com/
> Signed-off-by: Jiri Pirko <jiri@...dia.com>

Tested-by: Ido Schimmel <idosch@...dia.com>