linux-kernel - Re: [PATCH net v2] r8169: fix rtl8125b PAUSE frames blasting when suspended

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Date:   Sat, 2 Dec 2023 09:19:48 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     ChunHao Lin <hau@...ltek.com>
Cc:     nic_swsd@...ltek.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, grundler@...omium.org,
        stable@...r.kernel.org
Subject: Re: [PATCH net v2] r8169: fix rtl8125b PAUSE frames blasting when
 suspended

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@...omium.org>
> Tested-by: Grant Grundler <grundler@...omium.org>
> Cc: stable@...r.kernel.org
> Signed-off-by: ChunHao Lin <hau@...ltek.com>
> ---
> v2:
> - update comment and title.
> ---

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