netdev - Re: [PATCH v2 net-next 1/8] net: bridge: vlan: notify switchdev only when something changed

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Message-ID: <20220215000534.y6lhn2uvdtepx2v3@skbuf>
Date:   Tue, 15 Feb 2022 00:05:35 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Rafael Richter <rafael.richter@....de>,
        Daniel Klauer <daniel.klauer@....de>,
        Tobias Waldekranz <tobias@...dekranz.com>
Subject: Re: [PATCH v2 net-next 1/8] net: bridge: vlan: notify switchdev only
 when something changed

On Tue, Feb 15, 2022 at 01:31:04AM +0200, Vladimir Oltean wrote:
> +/* return true if anything will change as a result of __vlan_add_flags,
> + * false otherwise
> + */
> +static bool __vlan_flags_would_change(struct net_bridge_vlan *v, u16 flags)
> +{
> +	struct net_bridge_vlan_group *vg;
> +	u16 old_flags = v->flags;
> +	bool pvid_changed;
>  
> -	return ret || !!(old_flags ^ v->flags);
> +	if (br_vlan_is_master(v))
> +		vg = br_vlan_group(v->br);
> +	else
> +		vg = nbp_vlan_group(v->port);
> +
> +	if (flags & BRIDGE_VLAN_INFO_PVID)
> +		pvid_changed = (vg->pvid == v->vid);
> +	else
> +		pvid_changed = (vg->pvid != v->vid);

Yikes, I was planning to fix this but I forgot. The conditions are in
reverse, it should be:

	if (flags & BRIDGE_VLAN_INFO_PVID)
		pvid_changed = (vg->pvid != v->vid);
	else
		pvid_changed = (vg->pvid == v->vid);

> +
> +	return pvid_changed || !!(old_flags ^ v->flags);
>  }