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Message-ID: <5576d307-36f7-4cb5-80e7-290b659ba573@gmail.com>
Date:   Sat, 2 Dec 2023 09:19:48 +0100
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Subject: Re: [PATCH net v2] r8169: fix rtl8125b PAUSE frames blasting when
 suspended
Content-Language: en-US
To:     ChunHao Lin <hau@realtek.com>
Cc:     nic_swsd@realtek.com, davem@davemloft.net, edumazet@google.com,
        kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, grundler@chromium.org,
        stable@vger.kernel.org
References: <20231129155350.5843-1-hau@realtek.com>
From:   Heiner Kallweit <hkallweit1@gmail.com>
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In-Reply-To: <20231129155350.5843-1-hau@realtek.com>
Content-Type: text/plain; charset=UTF-8
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Precedence: bulk

On 29.11.2023 16:53, ChunHao Lin wrote:
> When FIFO reaches near full state, device will issue pause frame.
> If pause slot is enabled(set to 1), in this time, device will issue
> pause frame only once. But if pause slot is disabled(set to 0), device
> will keep sending pause frames until FIFO reaches near empty state.
> 
> When pause slot is disabled, if there is no one to handle receive
> packets, device FIFO will reach near full state and keep sending
> pause frames. That will impact entire local area network.
> 
> This issue can be reproduced in Chromebox (not Chromebook) in
> developer mode running a test image (and v5.10 kernel):
> 1) ping -f $CHROMEBOX (from workstation on same local network)
> 2) run "powerd_dbus_suspend" from command line on the $CHROMEBOX
> 3) ping $ROUTER (wait until ping fails from workstation)
> 
> Takes about ~20-30 seconds after step 2 for the local network to
> stop working.
> 
> Fix this issue by enabling pause slot to only send pause frame once
> when FIFO reaches near full state.
> 
> Fixes: f1bce4ad2f1c ("r8169: add support for RTL8125")
> Reported-by: Grant Grundler <grundler@chromium.org>
> Tested-by: Grant Grundler <grundler@chromium.org>
> Cc: stable@vger.kernel.org
> Signed-off-by: ChunHao Lin <hau@realtek.com>
> ---
> v2:
> - update comment and title.
> ---

Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>