netdev - Re: [[PATCH,net]] net: dsa: mt7530: Change the LINK bit to reflect the link status

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Message-ID: <20200319124123.GB3412372@t480s.localdomain>
Date:   Thu, 19 Mar 2020 12:41:23 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     René van Dorst <opensource@...rst.com>
Cc:     netdev@...r.kernel.org, Frank Wunderlich <frank-w@...lic-files.de>,
        DENG Qingfang <dqfext@...il.com>,
        Landen Chao <landen.chao@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-mediatek@...ts.infradead.org,
        René van Dorst <opensource@...rst.com>,
        Andrew Smith <andrew.smith@...i.com>
Subject: Re: [[PATCH,net]] net: dsa: mt7530: Change the LINK bit to reflect
 the link status

Hi René,

On Thu, 19 Mar 2020 14:47:56 +0100, René van Dorst <opensource@...rst.com> wrote:
> Andrew reported:
> 
> After a number of network port link up/down changes, sometimes the switch
> port gets stuck in a state where it thinks it is still transmitting packets
> but the cpu port is not actually transmitting anymore. In this state you
> will see a message on the console
> "mtk_soc_eth 1e100000.ethernet eth0: transmit timed out" and the Tx counter
> in ifconfig will be incrementing on virtual port, but not incrementing on
> cpu port.
> 
> The issue is that MAC TX/RX status has no impact on the link status or
> queue manager of the switch. So the queue manager just queues up packets
> of a disabled port and sends out pause frames when the queue is full.
> 
> Change the LINK bit to reflect the link status.
> 
> Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
> Reported-by: Andrew Smith <andrew.smith@...i.com>
> Signed-off-by: René van Dorst <opensource@...rst.com>

Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>

For the subject prefix, it is preferable to use "[PATCH net]" over
"[[PATCH,net]]". You can easily add this bracketed prefix with git
format-patch's option --subject-prefix="PATCH net".


Thank you,

	Vivien