netdev - Re: [PATCH v3 net-next 2/4] net: dsa: Link aggregation support

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Message-ID: <20201202105820.4de653a2@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date:   Wed, 2 Dec 2020 10:58:20 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, olteanv@...il.com, j.vosburgh@...il.com,
        vfalico@...il.com, andy@...yhouse.net, netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 2/4] net: dsa: Link aggregation support

On Wed,  2 Dec 2020 10:13:54 +0100 Tobias Waldekranz wrote:
> Monitor the following events and notify the driver when:
> 
> - A DSA port joins/leaves a LAG.
> - A LAG, made up of DSA ports, joins/leaves a bridge.
> - A DSA port in a LAG is enabled/disabled (enabled meaning
>   "distributing" in 802.3ad LACP terms).
> 
> Each LAG interface to which a DSA port is attached is represented by a
> `struct dsa_lag` which is globally reachable from the switch tree and
> from each associated port.
> 
> When a LAG joins a bridge, the DSA subsystem will treat that as each
> individual port joining the bridge. The driver may look at the port's
> LAG pointer to see if it is associated with any LAG, if that is
> required. This is analogue to how switchdev events are replicated out
> to all lower devices when reaching e.g. a LAG.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>

Any idea where this is coming from?

net/dsa/slave.c: note: in included file:
net/dsa/dsa_priv.h:194:31: error: incompatible types in comparison expression (different address spaces):
net/dsa/dsa_priv.h:194:31:    struct net_device [noderef] __rcu *
net/dsa/dsa_priv.h:194:31:    struct net_device *