linux-kernel - Re: [PATCH net-next 4/5] net: ravb: Do not apply RX checksum settings to hardware if the interface is down

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Date: Thu, 8 Feb 2024 18:11:35 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Sergey Shtylyov <s.shtylyov@....ru>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next 4/5] net: ravb: Do not apply RX checksum settings
 to hardware if the interface is down



On 07.02.2024 22:50, Sergey Shtylyov wrote:
> On 2/7/24 3:07 PM, Claudiu wrote:
> 
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Do not apply the RX checksum 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
> 
>    The register contents? I thought I'd pointed out all of these...
> 
>> applying settings in reset mode is not an option. Instead, cache the RX
>> checksum settings and apply them in ravb_open() through ravb_emac_init().
>> This has been solved by introducing pm_runtime_active() check. The device
>> runtime PM usage counter has been incremented to avoid disabling the device
>> clocks while the check is in progress (if any).
>>
>> Commit prepares for the addition of runtime PM.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> 
>    I'm afraid such check now needs to be added to ravb_set_features_gbeth()
> that's populated by Biju Das' checksum patches (which I've already ACKed)...

Yes, it's on my radar. I'll check it and update it (if any) in the next
version.

Thank you,
Claudiu Beznea

> 
> [...]
> 
> MBR, Sergey