netdev - RE: [PATCH] net: stmmac: fix MAC not working when system resume back with WoL enabled

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Date:   Mon, 6 Sep 2021 10:41:48 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Russell King <linux@...linux.org.uk>
CC:     Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] net: stmmac: fix MAC not working when system resume back
 with WoL enabled


Hi Russell,

> -----Original Message-----
> From: Russell King <linux@...linux.org.uk>
> Sent: 2021年9月6日 17:35
> To: Joakim Zhang <qiangqing.zhang@....com>
> Cc: Andrew Lunn <andrew@...n.ch>; Vladimir Oltean <olteanv@...il.com>;
> peppe.cavallaro@...com; alexandre.torgue@...s.st.com;
> joabreu@...opsys.com; davem@...emloft.net; kuba@...nel.org;
> mcoquelin.stm32@...il.com; netdev@...r.kernel.org; f.fainelli@...il.com;
> hkallweit1@...il.com; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH] net: stmmac: fix MAC not working when system resume
> back with WoL enabled
> 
> Hi,
> 
> On Mon, Sep 06, 2021 at 02:29:30AM +0000, Joakim Zhang wrote:
> > Hi Russell,
> >
> > > -----Original Message-----
> > > +		/* Re-apply the link parameters so that all the settings get
> > > +		 * restored to the MAC.
> > > +		 */
> > > +		phylink_mac_initial_config(pl, true);
> > > +		phylink_enable_and_run_resolve(pl,
> PHYLINK_DISABLE_MAC_WOL);
> >
> > There is no "phylink_enable_and_run_resolve " sysbol, I guess you want do
> below operations in this function:
> > 	clear_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state);
> > 	phylink_run_resolve(pl);
> 
> Yes, that is correct.
> 
> Please let me know whether that works for you.

Thanks Russell, it works as we are expected, I test both MAC-based WoL active and inactive cases.

And I get the point you mentioned before, if link parameters changed during system suspended, what would happen?
I tried both FEC and STMMAC, the system can't be waked up via remote magic packets!!!
I have not think about this scenario before....

Since net-next is closed, so I would cook a patch set (keep you as the phylink patch author) after it re-open, could you
accept it? Or you plan to prepare this patch set for stmmac?

There is also a problem, we need a fix for LTS (5.10, 5.15), above patch set should go to 5.16, do you have any suggestion?

Best Regards,
Joakim Zhang