linux-kernel - Re: net: stmmac: dwmac-imx: half duplex crash

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Date:   Mon, 25 Apr 2022 00:01:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marcel Ziswiler <marcel.ziswiler@...adex.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-imx@....com" <linux-imx@....com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "kuba@...nel.org" <kuba@...nel.org>
Subject: Re: net: stmmac: dwmac-imx: half duplex crash

On Sat, Apr 23, 2022 at 10:58:07PM +0000, Marcel Ziswiler wrote:
> Hi there
> 
> We lately tried operating the IMX8MPEVK ENET_QOS imx-dwmac driver in half-duplex modes which crashes as
> follows:

How many transmit queues do you have in operation:

       /* Half-Duplex can only work with single queue */
        if (priv->plat->tx_queues_to_use > 1)
                priv->phylink_config.mac_capabilities &=
                        ~(MAC_10HD | MAC_100HD | MAC_1000HD);

What does ethtool show before you force it? Does it actually list the
HALF modes?

     Andrew