linux-kernel - Re: [PATCH net 3/3] net: stmmac: check if interface is running before TC block setup

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Message-ID: <e1e9c67e-04c7-4db4-9719-25e5d0609490@intel.com>
Date: Thu, 4 Sep 2025 21:01:49 +0200
From: Sebastian Basierski <sebastian.basierski@...el.com>
To: Jakub Kicinski <kuba@...nel.org>, Konrad Leszczynski
	<konrad.leszczynski@...el.com>
CC: <davem@...emloft.net>, <andrew+netdev@...n.ch>, <edumazet@...gle.com>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <cezary.rojewski@...el.com>, Karol Jurczenia
	<karol.jurczenia@...el.com>
Subject: Re: [PATCH net 3/3] net: stmmac: check if interface is running before
 TC block setup


On 9/1/2025 10:03 PM, Jakub Kicinski wrote:
> More context would be useful. What's the user-visible behavior before
> and after? Can the device handle installing the filters while down?
> Is it just an issue of us restarting the queues when we shouldn't?

Before this patch driver couldn't be unloaded with tc filter applied.

Running those commands is enough to reproduce the issue:
   tc qdisc add dev enp0s29f2 ingress
   tc filter add dev enp0s29f2 ingress protocol all prio 1 u32
   rmmod dwmac_intel

in effect module would not unload.