Re: [PATCH V3 net-next 1/4] net: bridge: add fdb flag to extent locked port feature

[Ido Schimmel]

On Tue, May 31, 2022 at 11:34:21AM +0200, Hans Schultz wrote:
> > Just to give you another data point about how this works in other
> > devices, I can say that at least in Spectrum this works a bit
> > differently. Packets that ingress via a locked port and incur an FDB
> > miss are trapped to the CPU where they should be injected into the Rx
> > path so that the bridge will create the 'locked' FDB entry and notify it
> > to user space. The packets are obviously rated limited as the CPU cannot
> > handle billions of packets per second, unlike the ASIC. The limit is not
> > per bridge port (or even per bridge), but instead global to the entire
> > device.
> 
> Btw, will the bridge not create a SWITCHDEV_FDB_ADD_TO_DEVICE event
> towards the switchcore in the scheme you mention and thus add an entry
> that opens up for the specified mac address?

It will, but the driver needs to ignore FDB entries that are notified
with locked flag. I see that you extended 'struct
switchdev_notifier_fdb_info' with the locked flag, but it's not
initialized in br_switchdev_fdb_populate(). Can you add it in the next
version?