On 2022-10-20 15:35, Vladimir Oltean wrote:
On Thu, Oct 20, 2022 at 04:24:16PM +0300, Ido Schimmel wrote:
On Thu, Oct 20, 2022 at 04:02:24PM +0300, Vladimir Oltean wrote:
On Tue, Oct 18, 2022 at 06:56:12PM +0200, Hans J. Schultz wrote:
@@ -3315,6 +3316,7 @@ static int dsa_slave_fdb_event(struct net_device *dev, struct dsa_port *dp = dsa_slave_to_port(dev); bool host_addr = fdb_info->is_local; struct dsa_switch *ds = dp->ds;
u16 fdb_flags = 0;
if (ctx && ctx != dp) return 0;
@@ -3361,6 +3363,9 @@ static int dsa_slave_fdb_event(struct net_device *dev, orig_dev->name, fdb_info->addr, fdb_info->vid, host_addr ? " as host address" : "");
- if (fdb_info->locked)
fdb_flags |= DSA_FDB_FLAG_LOCKED;This is the bridge->driver direction. In which of the changes up until now/through which mechanism will the bridge emit a SWITCHDEV_FDB_ADD_TO_DEVICE with fdb_info->locked = true?
I believe it can happen in the following call chain:
br_handle_frame_finish br_fdb_update // p->flags & BR_PORT_MAB fdb_notify br_switchdev_fdb_notify
This can happen with Spectrum when a packet ingresses via a locked port and incurs an FDB miss in hardware. The packet will be trapped and injected to the Rx path where it should invoke the above call chain.
Ah, so this is the case which in mv88e6xxx would generate an ATU violation interrupt; in the Spectrum case it generates a special packet. Right now this packet isn't generated, right?
I think we have the same thing in ocelot, a port can be configured to send "learn frames" to the CPU.
Should these packets be injected into the bridge RX path in the first place? They reach the CPU because of an FDB miss, not because the CPU was the intended destination.
Just to add to it, now that there is a u16 for flags in the bridge->driver direction, making it easier to add such flags, I expect that for the mv88e6xxx driver there shall be a 'IS_DYNAMIC' flag also, as authorized hosts will have their authorized FDB entries added with dynamic entries...
Now as the bridge will not be able to refresh such authorized FDB entries based on unicast incoming traffic on the locked port in the offloaded case, besides we don't want the CPU to do such in this case anyway, to keep the authorized line alive without having to reauthorize in like every 5 minutes, the driver needs to do the ageing (and refreshing) of the dynamic entry added from userspace. When the entry "ages" out, there is the HoldAt1 feature and Age Out Violations that should be used to tell userspace (plus bridge) that this authorization has been removed by the driver as the host has gone quiet.
So all in all, there is the need of another flag from userspace->bridge->driver, telling that we want a dynamic ATU entry (with mv88e6xxx it will start at age 7).