Re: [PATCH v8 net-next 05/12] net: dsa: propagate the locked flag down through the DSA layer

Vladimir Oltean
2022-10-20T15:37:45Z

On Thu, Oct 20, 2022 at 06:23:37PM +0300, Ido Schimmel wrote:
> 3. Miss. FDB entry not found. Here I was thinking to always tell the
> packet to go to the software data path so that it will trigger the
> creation of the "locked" entry if MAB is enabled. If MAB is not enabled,
> it will simply be dropped by the bridge. We can't control it per port in
> hardware, which is why the BR_PORT_MAB flag is not consulted.

Ah, ok, this is the part I was missing, so you can't control an FDB miss
to generate a learn frame only on some ports. But in principle, it still
is the BR_PORT_MAB flag the one which requires these frames to be generated,
not BR_PORT_LOCKED. You can have all ports LOCKED but not MAB, and no
learn frames will be necessary to be sent to the CPU. Only EAPOL, which
is link-local multicast, will reach software for further processing and
unlock the port for a certain MAC DA.