linux-kernel - RE: [EXT] Re: [PATCH RFC net-next 03/19] net: mvpp2: add CM3 SRAM memory map

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Date:   Sun, 10 Jan 2021 18:09:39 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "atenart@...nel.org" <atenart@...nel.org>
Subject: RE: [EXT] Re: [PATCH RFC net-next  03/19] net: mvpp2: add CM3 SRAM
 memory map

> > > > +	} else {
> > > > +		priv->sram_pool = of_gen_pool_get(dn, "cm3-mem", 0);
> > > > +		if (!priv->sram_pool) {
> > > > +			dev_warn(&pdev->dev, "DT is too old, TX FC
> > > disabled\n");
> > >
> > > I don't see anything in this patch that disables TX flow control,
> > > which means this warning message is misleading.
> >
> > OK, I would change to TX FC not supported.
> 
> And you should tell phlylink, so it knows to disable it in autoneg.
> 
> Which make me wonder, do we need a fix for stable? Has flow control never
> been support in this device up until these patches get merged?
> It should not be negotiated if it is not supported, which means telling phylink.
> 
>    Andrew

TX FC never were really supported. MAC or PHY can negotiated flow control.
But MAC would never trigger FC frame.

Should I prepare separate patch that disable TX FC till we merge this patches?

Regards,
Stefan.