linux-kernel - Re: [PATCH v3 net-next 06/10] net: dsa: microchip: add support for phylink management

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Message-ID: <20210731152729.r4lzc3md2bql2too@skbuf>
Date:   Sat, 31 Jul 2021 18:27:29 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc:     andrew@...n.ch, netdev@...r.kernel.org, robh+dt@...nel.org,
        UNGLinuxDriver@...rochip.com, Woojung.Huh@...rochip.com,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 net-next 06/10] net: dsa: microchip: add support for
 phylink management

On Fri, Jul 23, 2021 at 11:01:04PM +0530, Prasanna Vengateshan wrote:
> +static void lan937x_phylink_validate(struct dsa_switch *ds, int port,
> +				     unsigned long *supported,
> +				     struct phylink_link_state *state)
> +{
> +	struct ksz_device *dev = ds->priv;
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
> +
> +	/* Check for unsupported interfaces */
> +	if (!phy_interface_mode_is_rgmii(state->interface) &&
> +	    state->interface != PHY_INTERFACE_MODE_RMII &&
> +	    state->interface != PHY_INTERFACE_MODE_MII &&
> +	    state->interface != PHY_INTERFACE_MODE_INTERNAL) {

According to include/linux/phylink.h, when phylink passes
state->interface == PHY_INTERFACE_MODE_NA, you are expected to return
all supported link modes.