netdev - 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 08:09:17 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Sergey Shtylyov <s.shtylyov@....ru>, Claudiu.Beznea
	<claudiu.beznea@...on.dev>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...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

Hi Sergey,

> -----Original Message-----
> From: Sergey Shtylyov <s.shtylyov@....ru>
> Sent: Wednesday, February 7, 2024 8:50 PM
> Subject: Re: [PATCH net-next 4/5] net: ravb: Do not apply RX checksum
> settings to hardware if the interface is down
> 
> 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)...

You mean this check to be moved to ravb_set_features_rcar() instead of ravb_set_rx_csum()
as ravb_set_rx_csum() is called in receive path as well which is interface up case.
ON reset mode, anyway we don't get any interrupts so there is no rx.
Then possibility is through set_features??

Cheers,
Biju