From: Maxime Chevallier <maxime.chevallier@bootlin.com>
To: Nicolai Buchwitz <nb@tipi-net.de>,
Magnus Leatti <magnusleatti@kernelriot.com>
Cc: Yao Zi <me@ziyao.cc>, Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Nazim Amirul <muhammad.nazim.amirul.nazle.asmade@altera.com>,
netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] net: stmmac: dwmac-motorcomm: mask the MISC interrupt
Date: Mon, 2 Nov 2026 09:36:54 +0100 [thread overview]
Message-ID: <f5a88825-2d0b-4f5f-863b-e2369d009d24@bootlin.com> (raw)
In-Reply-To: <805aeb73d9e32b237bcb30c8fd44ffed@tipi-net.de>
Hi,
On 11/2/26 09:29, Nicolai Buchwitz wrote:
> Hi Magnus
>
> On 2.11.2026 09:09, Magnus Leatti wrote:
>
>> [...]
>
>> Russell, d3265c19b35d ("net: stmmac: xgmac2: disable RBUE in default RX
>> interrupt mask") describes a similar storm on xgmac2. Should dwmac4 do
>> the same? I have only tested the glue change.
>
> AFAIU RBU is the cause. Dropping it in dwmac4, as Russel did in d3265c19b35d,
> would cover all multi-MSI users.
As I commented, the other solution is to properly ack it. I'm not convinced about
the RBU interrupt's usefulness TBH, even when ack'd it makes a bad situation even
worse, but it does have the nice effect of making this visible by incrementing the
associated counter.
Anyway, this issue should be covered by this :
https://lore.kernel.org/all/20261030102251.208929-1-maxime.chevallier@bootlin.com/
Maxime
next prev parent reply other threads:[~2026-11-02 8:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-02 8:09 Magnus Leatti
2026-11-02 8:22 ` Maxime Chevallier
2026-11-02 8:53 ` Magnus Leatti
2026-11-02 8:29 ` Nicolai Buchwitz
2026-11-02 8:36 ` Maxime Chevallier [this message]
2026-11-02 9:02 ` Magnus Leatti
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