linux-kernel - Re: [RFC PATCH V2 net] net: phy: Fix "link partner" information disappear issue

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Date:   Wed, 16 Oct 2019 10:27:55 +0800
From:   Yonglong Liu <liuyonglong@...wei.com>
To:     Heiner Kallweit <hkallweit1@...il.com>, <davem@...emloft.net>,
        <andrew@...n.ch>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <salil.mehta@...wei.com>,
        <yisen.zhuang@...wei.com>, <shiju.jose@...wei.com>
Subject: Re: [RFC PATCH V2 net] net: phy: Fix "link partner" information
 disappear issue



On 2019/10/16 4:02, Heiner Kallweit wrote:
> On 14.10.2019 14:56, Yonglong Liu wrote:
>> Some drivers just call phy_ethtool_ksettings_set() to set the
>> links, for those phy drivers that use genphy_read_status(), if
>> autoneg is on, and the link is up, than execute "ethtool -s
>> ethx autoneg on" will cause "link partner" information disappear.
>>
>> The call trace is phy_ethtool_ksettings_set()->phy_start_aneg()
>> ->linkmode_zero(phydev->lp_advertising)->genphy_read_status(),
>> the link didn't change, so genphy_read_status() just return, and
>> phydev->lp_advertising is zero now.
>>
>> This patch moves the clear operation of lp_advertising from
>> phy_start_aneg() to genphy_read_lpa()/genphy_c45_read_lpa(), and
>> if autoneg on and autoneg not complete, just clear what the
>> generic functions care about.
>>
>> Fixes: 88d6272acaaa ("net: phy: avoid unneeded MDIO reads in genphy_read_status")
>> Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
>>
> Looks good to me, two small nits below.
> 
> 

Thanks! Will fix the two small nits and send it to "net" branch.

>> ---
>> change log:
>> V2: moves the clear operation of lp_advertising from
>> phy_start_aneg() to genphy_read_lpa()/genphy_c45_read_lpa(), and
>> if autoneg on and autoneg not complete, just clear what the
>> generic functions care about. Suggested by Heiner Kallweit.
>> ---
>> ---
> This line seems to be duplicated.
> 
>>  drivers/net/phy/phy-c45.c    |  2 ++
>>  drivers/net/phy/phy.c        |  3 ---
>>  drivers/net/phy/phy_device.c | 12 +++++++++++-
>>  3 files changed, 13 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
>> index 7935593..a1caeee 100644
>> --- a/drivers/net/phy/phy-c45.c
>> +++ b/drivers/net/phy/phy-c45.c
>> @@ -323,6 +323,8 @@ int genphy_c45_read_pma(struct phy_device *phydev)
>>  {
>>  	int val;
>>  
>> +	linkmode_zero(phydev->lp_advertising);
>> +
>>  	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
>>  	if (val < 0)
>>  		return val;
>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>> index 119e6f4..105d389b 100644
>> --- a/drivers/net/phy/phy.c
>> +++ b/drivers/net/phy/phy.c
>> @@ -572,9 +572,6 @@ int phy_start_aneg(struct phy_device *phydev)
>>  	if (AUTONEG_DISABLE == phydev->autoneg)
>>  		phy_sanitize_settings(phydev);
>>  
>> -	/* Invalidate LP advertising flags */
>> -	linkmode_zero(phydev->lp_advertising);
>> -
>>  	err = phy_config_aneg(phydev);
>>  	if (err < 0)
>>  		goto out_unlock;
>> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
>> index 9d2bbb1..4b43466 100644
>> --- a/drivers/net/phy/phy_device.c
>> +++ b/drivers/net/phy/phy_device.c
>> @@ -1787,7 +1787,14 @@ int genphy_read_lpa(struct phy_device *phydev)
>>  {
>>  	int lpa, lpagb;
>>  
>> -	if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
>> +	if (phydev->autoneg == AUTONEG_ENABLE) {
>> +		if (!phydev->autoneg_complete) {
>> +			mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
>> +							0);
>> +			mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
>> +			return 0;
>> +		}
>> +
>>  		if (phydev->is_gigabit_capable) {
>>  			lpagb = phy_read(phydev, MII_STAT1000);
>>  			if (lpagb < 0)
>> @@ -1816,6 +1823,9 @@ int genphy_read_lpa(struct phy_device *phydev)
>>  
>>  		mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa);
>>  	}
>> +	else {
> 
> "} else {" should be on one line.
> 
>> +		linkmode_zero(phydev->lp_advertising);
>> +	}
>>  
>>  	return 0;
>>  }
>>
> 
> 
> .
>