linux-kernel - Re: [PATCH net-next v3 18/19] net: ravb: Do not apply RX CSUM settings to hardware if the interface is down

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Date: Mon, 8 Jan 2024 23:36:37 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<richardcochran@...il.com>, <p.zabel@...gutronix.de>,
	<yoshihiro.shimoda.uh@...esas.com>, <wsa+renesas@...g-engineering.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <geert+renesas@...der.be>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v3 18/19] net: ravb: Do not apply RX CSUM
 settings to hardware if the interface is down

On 1/8/24 11:34 PM, Sergey Shtylyov wrote:
[...]

>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Do not apply the RX CSUM settings to hardware if the interface is down. In
>> case runtime PM is enabled, and while the interface is down, the IP will be
>> in reset mode (as for some platforms disabling the clocks will switch the
>> IP to reset mode, which will lead to losing registers content) and applying
>> settings in reset mode is not an option. Instead, cache the RX CSUM
>> settings and apply them in ravb_open() though ravb_emac_init().
>>
>> Commit prepares for the addition of runtime PM.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> [...]
> 
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
>> index 168b6208db37..e909960fbc30 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -2342,6 +2342,9 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
>>  	struct ravb_private *priv = netdev_priv(ndev);
>>  	unsigned long flags;
>>  
>> +	if (!(ndev->flags & IFF_UP))
> 
>    Well, I guess it's even OK to even write EDCMR in the reset mode... BUT

   Well, I guess it's even OK to write ECMR in the reset mode... :-)

> again, won't this race with pm_runtime_put_autosuspend() when its call gets
> added to ravb_close()?

[...]

MBR, Sergey