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

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Message-ID: <9b95b6f8-723b-f078-c9c6-f8333c93fdff@gmail.com>
Date:   Fri, 18 Jun 2021 18:59:12 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        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 6/18/2021 11:30 AM, 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: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian