netdev - Re: [PATCH net-next 05/13] net: dsa: lantiq_gswip: do also enable or disable cpu port

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Date: Fri, 07 Jun 2024 14:14:42 +0200
From: Martin Schiller <ms@....tdt.de>
To: Vladimir Oltean <olteanv@...il.com>
Cc: martin.blumenstingl@...glemail.com, hauke@...ke-m.de, andrew@...n.ch,
 f.fainelli@...il.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 05/13] net: dsa: lantiq_gswip: do also enable or
 disable cpu port

On 2024-06-07 13:18, Vladimir Oltean wrote:
> On Thu, Jun 06, 2024 at 10:52:26AM +0200, Martin Schiller wrote:
>> Before commit 74be4babe72f ("net: dsa: do not enable or disable non 
>> user
>> ports"), gswip_port_enable/disable() were also executed for the cpu 
>> port
>> in gswip_setup() which disabled the cpu port during initialization.
> 
> Ah, you also noticed this.
> 
>> 
>> Let's restore this by removing the dsa_is_user_port checks. Also, 
>> let's
>> clean up the gswip_port_enable() function so that we only have to 
>> check
>> for the cpu port once.
>> 
>> Fixes: 74be4babe72f ("net: dsa: do not enable or disable non user 
>> ports")
> 
> Fixes tags shouldn't be taken lightly. If you think there's a 
> functional
> user-visible problem caused by that change, you need to explain what
> that problem is and what it affects. Additionally, bug fix patches are
> sent out to the 'net' tree, not bundled up with 'net-next' material
> (unless they fix a change that's also exclusive to net-next).
> Otherwise, just drop the 'Fixes' tag.

OK, I will drop the 'Fixes' tag.

> 
>> Signed-off-by: Martin Schiller <ms@....tdt.de>
>> ---
>>  drivers/net/dsa/lantiq_gswip.c | 24 ++++++++----------------
>>  1 file changed, 8 insertions(+), 16 deletions(-)
>> 
>> diff --git a/drivers/net/dsa/lantiq_gswip.c 
>> b/drivers/net/dsa/lantiq_gswip.c
>> index 3fd5599fca52..38b5f743e5ee 100644
>> --- a/drivers/net/dsa/lantiq_gswip.c
>> +++ b/drivers/net/dsa/lantiq_gswip.c
>> @@ -695,13 +695,18 @@ static int gswip_port_enable(struct dsa_switch 
>> *ds, int port,
>>  	struct gswip_priv *priv = ds->priv;
>>  	int err;
>> 
>> -	if (!dsa_is_user_port(ds, port))
>> -		return 0;
>> -
>>  	if (!dsa_is_cpu_port(ds, port)) {
>> +		u32 mdio_phy = 0;
>> +
>>  		err = gswip_add_single_port_br(priv, port, true);
>>  		if (err)
>>  			return err;
>> +
>> +		if (phydev)
>> +			mdio_phy = phydev->mdio.addr & GSWIP_MDIO_PHY_ADDR_MASK;
>> +
>> +		gswip_mdio_mask(priv, GSWIP_MDIO_PHY_ADDR_MASK, mdio_phy,
>> +				GSWIP_MDIO_PHYp(port));
>>  	}
>> 
>>  	/* RMON Counter Enable for port */
>> @@ -714,16 +719,6 @@ static int gswip_port_enable(struct dsa_switch 
>> *ds, int port,
>>  	gswip_switch_mask(priv, 0, GSWIP_SDMA_PCTRL_EN,
>>  			  GSWIP_SDMA_PCTRLp(port));
>> 
>> -	if (!dsa_is_cpu_port(ds, port)) {
>> -		u32 mdio_phy = 0;
>> -
>> -		if (phydev)
>> -			mdio_phy = phydev->mdio.addr & GSWIP_MDIO_PHY_ADDR_MASK;
>> -
>> -		gswip_mdio_mask(priv, GSWIP_MDIO_PHY_ADDR_MASK, mdio_phy,
>> -				GSWIP_MDIO_PHYp(port));
>> -	}
>> -
>>  	return 0;
>>  }
> 
> It would be good to state in the commit message that the operation
> reordering is safe. The commit seems to be concerned mainly with code
> cleanliness, which does not always take side effects into account.

Thanks for the hint. I will take it into account in the commit message.