From: Jakub Kicinski <kuba@kernel.org>
To: Tomas Melin <tomas.melin@vaisala.com>
Cc: netdev@vger.kernel.org, nicolas.ferre@microchip.com,
claudiu.beznea@microchip.com, davem@davemloft.net,
pabeni@redhat.com
Subject: Re: [PATCH v2] net: macb: Restart tx only if queue pointer is lagging
Date: Mon, 11 Apr 2022 18:19:21 -0700 [thread overview]
Message-ID: <20220411181921.245ba3e6@kernel.org> (raw)
In-Reply-To: <20220407161659.14532-1-tomas.melin@vaisala.com>
On Thu, 7 Apr 2022 19:16:59 +0300 Tomas Melin wrote:
> commit 4298388574da ("net: macb: restart tx after tx used bit read")
> added support for restarting transmission. Restarting tx does not work
> in case controller asserts TXUBR interrupt and TQBP is already at the end
> of the tx queue. In that situation, restarting tx will immediately cause
> assertion of another TXUBR interrupt. The driver will end up in an infinite
> interrupt loop which it cannot break out of.
>
> For cases where TQBP is at the end of the tx queue, instead
> only clear TX_USED interrupt. As more data gets pushed to the queue,
> transmission will resume.
>
> This issue was observed on a Xilinx Zynq-7000 based board.
> During stress test of the network interface,
> driver would get stuck on interrupt loop within seconds or minutes
> causing CPU to stall.
>
> Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
Applied, thanks. Commit 5ad7f18cd82c ("net: macb: Restart tx only if
queue pointer is lagging") in net.
prev parent reply other threads:[~2022-04-12 1:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 16:16 [PATCH v2] net: macb: Restart tx only if queue pointer is lagging Tomas Melin
2022-04-08 7:42 ` Claudiu.Beznea
2022-04-08 8:47 ` Harini Katakam
2022-04-08 9:57 ` Tomas Melin
2022-04-08 12:02 ` Harini Katakam
2022-04-12 1:19 ` Jakub Kicinski [this message]
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