netdev - Re: [PATCH net-next 1/6] net: dsa: assert uniqueness of dsa,member properties

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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