linux-kernel - Re: [PATCH net-next v2 4/5] net: pcs: qcom-ipq9574: Add USXGMII interface mode support

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Message-ID: <dc40d847-9a98-4f46-94cb-208257334aed@quicinc.com>
Date: Sat, 7 Dec 2024 00:20:57 +0800
From: Lei Wei <quic_leiwei@...cinc.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
CC: "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni
	<pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Andrew Lunn
	<andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_kkumarcs@...cinc.com>, <quic_suruchia@...cinc.com>,
        <quic_pavir@...cinc.com>, <quic_linchen@...cinc.com>,
        <quic_luoj@...cinc.com>, <srinivas.kandagatla@...aro.org>,
        <bartosz.golaszewski@...aro.org>, <vsmuthu@....qualcomm.com>,
        <john@...ozen.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH net-next v2 4/5] net: pcs: qcom-ipq9574: Add USXGMII
 interface mode support



On 12/4/2024 11:38 PM, Russell King (Oracle) wrote:
> On Wed, Dec 04, 2024 at 10:43:56PM +0800, Lei Wei wrote:
>> +static int ipq_pcs_link_up_config_usxgmii(struct ipq_pcs *qpcs, int speed)
>> +{
> ...
>> +	/* USXGMII only support full duplex mode */
>> +	val |= XPCS_DUPLEX_FULL;
> 
> Again... this restriction needs to be implemented in .pcs_validate() by
> knocking out the half-duplex link modes when using USXGMII mode.
> 
> .pcs_validate() needs to be implemented whenever the PCS has
> restrictions beyond what is standard for the PHY interface mode.
> 

Currently, it seems there is no phylink_validate() call in 
phylink_resolve(), to validate the resolved duplex/speed which is 
notified by phydev when the PHY is linked up. So I am thinking to add 
this duplex check in this link_up op, and return an appropriate error in 
case of half-duplex. (Kindly correct me if I am wrong).

> Thanks.
>