linux-kernel - Re: [PATCH net-next] net: dsa: Support bridge 802.1Q while untagging

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Date:   Wed, 30 Sep 2020 20:43:59 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Florian Fainelli <f.fainelli@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: Support bridge 802.1Q while untagging

On Wed, Sep 30, 2020 at 01:31:03PM -0700, Florian Fainelli wrote:
> While we are it, call __vlan_find_dev_deep_rcu() which makes use the
> VLAN group array which is faster.

Not just "while at it", but I do wonder whether it isn't, in fact,
called "deep" for a reason:

		/*
		 * Lower devices of master uppers (bonding, team) do not have
		 * grp assigned to themselves. Grp is assigned to upper device
		 * instead.
		 */

I haven't tested this, but I wonder if you could actually call
__vlan_find_dev_deep_rcu() on the switch port interface and it would
cover both this and the bridge having an 8021q upper automatically?