Re: [PATCH v3 net 1/1] net: dsa: mv88e6xxx: Verify after ATU Load ops

[Andrew Lunn]

On Thu, Mar 06, 2025 at 12:23:05PM -0500, Joseph Huang wrote:
> ATU Load operations could fail silently if there's not enough space
> on the device to hold the new entry. When this happens, the symptom
> depends on the unknown flood settings. If unknown multicast flood is
> disabled, the multicast packets are dropped when the ATU table is
> full. If unknown multicast flood is enabled, the multicast packets
> will be flooded to all ports. Either way, IGMP snooping is broken
> when the ATU Load operation fails silently.
> 
> Do a Read-After-Write verification after each fdb/mdb add operation
> to make sure that the operation was really successful, and return
> -ENOSPC otherwise.
> 
> Fixes: defb05b9b9b4 ("net: dsa: mv88e6xxx: Add support for fdb_add, fdb_del, and fdb_getnext")
> Signed-off-by: Joseph Huang <Joseph.Huang@xxxxxxxxxx>

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew