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Message-ID: <YNCZ8xv+b2sDrlNM@lunn.ch>
Date: Mon, 21 Jun 2021 15:53:55 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Florian Fainelli <f.fainelli@...il.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next 1/6] net: dsa: assert uniqueness of dsa,member
properties
On Fri, Jun 18, 2021 at 09:30:12PM +0300, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> The cross-chip notifiers work by comparing each ds->index against the
> info->sw_index value from the notifier. The ds->index is retrieved from
> the device tree dsa,member property.
>
> If a single tree cross-chip topology does not declare unique switch IDs,
> this will result in hard-to-debug issues/voodoo effects such as the
> cross-chip notifier for one switch port also matching the port with the
> same number from another switch.
>
> Check in dsa_switch_parse_member_of() whether the DSA switch tree
> contains a DSA switch with the index we're preparing to add, before
> actually adding it.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Andrew
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