netdev - Re: [PATCH 3/3] net: dsa: ksz: Add Microchip KSZ8795 DSA driver

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Date:   Thu, 25 Jul 2019 16:59:24 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org, Tristram Ha <Tristram.Ha@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>
Subject: Re: [PATCH 3/3] net: dsa: ksz: Add Microchip KSZ8795 DSA driver

On Thu, Jul 25, 2019 at 04:56:37PM +0200, Marek Vasut wrote:
> On 7/25/19 4:03 PM, Andrew Lunn wrote:
> > On Wed, Jul 24, 2019 at 03:40:48PM +0200, Marek Vasut wrote:
> >> From: Tristram Ha <Tristram.Ha@...rochip.com>
> >> +static void ksz8795_phy_setup(struct ksz_device *dev, int port,
> >> +			      struct phy_device *phy)
> >> +{
> >> +	if (port < dev->phy_port_cnt) {
> >> +		/*
> >> +		 * SUPPORTED_Asym_Pause and SUPPORTED_Pause can be removed to
> >> +		 * disable flow control when rate limiting is used.
> >> +		 */
> >> +		linkmode_copy(phy->advertising, phy->supported);
> >> +	}
> >> +}
> > 
> > Hi Marek
> > 
> > Do you know why this is needed?
> 
> Unfortunately, no.
> 
> It seems it copies supported features of the PHY to advertised features
> of the PHY for ports which are downstream (i.e. not the CPU port).

Hi Marek

Could you test it without this copy? Do you get sensible values from
ethtool? Does the pause configuration look sensible?

Thanks
	Andrew