netdev - Re: [RFC PATCH net-next 4/5] net: dsa: realtek-smi: add rtl8365mb subdriver for RTL8365MB-VC

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Date:   Mon, 23 Aug 2021 01:48:05 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Alvin Šipraga <alvin@...s.dk>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, mir@...g-olufsen.dk,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 4/5] net: dsa: realtek-smi: add rtl8365mb
 subdriver for RTL8365MB-VC

On Sun, Aug 22, 2021 at 09:31:42PM +0200, Alvin Šipraga wrote:
> +static bool rtl8365mb_is_vlan_valid(struct realtek_smi *smi, unsigned int vlan)

Maybe it would be more efficient to make smi->ops->is_vlan_valid optional?

> +{
> +	if (vlan > RTL8365MB_VIDMAX)
> +		return false;
> +
> +	return true;
> +}
> +
> +static int rtl8365mb_enable_vlan(struct realtek_smi *smi, bool enable)
> +{
> +	dev_dbg(smi->dev, "%s VLAN\n", enable ? "enable" : "disable");
> +	return regmap_update_bits(
> +		smi->map, RTL8365MB_VLAN_CTRL_REG, RTL8365MB_VLAN_CTRL_EN_MASK,
> +		FIELD_PREP(RTL8365MB_VLAN_CTRL_EN_MASK, enable ? 1 : 0));
> +}
> +
> +static int rtl8365mb_enable_vlan4k(struct realtek_smi *smi, bool enable)
> +{
> +	return rtl8365mb_enable_vlan(smi, enable);
> +}

I'm not going to lie, the realtek_smi_ops VLAN methods seem highly
cryptic to me. Why do you do the same thing from .enable_vlan4k as from
.enable_vlan? What are these supposed to do in the first place?
Or to quote from rtl8366_vlan_add: "what's with this 4k business?"

Also, stupid question: what do you need the VLAN ops for if you haven't
implemented .port_bridge_join and .port_bridge_leave? How have you
tested them?