Re: [PATCH v4 net-next 3/6] drivers: net: dsa: add locked fdb entry flag to drivers

netdev
2022-08-01T15:33:58Z

On 2022-07-13 14:39, Ido Schimmel wrote:

>
> What are "Storm Prevention" and "zero-DPV" FDB entries?
>

For the zero-DPV entries, I can summarize:

Since a CPU can become saturated from constant SA Miss Violations from a
denied source, source MAC address are masked by loading a zero-DPV
(Destination Port Vector) entry in the ATU. As the address now appears
in the database it will not cause more Miss Violations. ANY port trying
to send a frame to this unauthorized address is discarded. Any locked
port trying to use this unauthorized address has its frames discarded
too (as the ports SA bit is not set in the ATU entry).