linux-kernel - Re: [PATCH] net: thunderx: Fix BGX transmit stall due to underflow

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Message-Id: <20170729.141813.2129692875257358096.davem@davemloft.net>
Date:   Sat, 29 Jul 2017 14:18:13 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     sunil.kovvuri@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, sgoutham@...ium.com
Subject: Re: [PATCH] net: thunderx: Fix BGX transmit stall due to underflow

From: sunil.kovvuri@...il.com
Date: Thu, 27 Jul 2017 12:53:04 +0530

> From: Sunil Goutham <sgoutham@...ium.com>
> 
> For SGMII/RGMII/QSGMII interfaces when physical link goes down
> while traffic is high is resulting in underflow condition being set
> on that specific BGX's LMAC. Which assets a backpresure and VNIC stops
> transmitting packets.
> 
> This is due to BGX being disabled in link status change callback while
> packet is in transit. This patch fixes this issue by not disabling BGX
> but instead just disables packet Rx and Tx.
> 
> Signed-off-by: Sunil Goutham <sgoutham@...ium.com>

Applied.