For 802.1X or MAB security authed hosts we want to have these hosts authed
by adding dynamic FDB entries, so that if an authed host goes silent for
a time period it's FDB entry will be removed and it must reauth when
wanting to communicate again.
In the mv88e6xxx offloaded case, we can use the HoldAt1 feature, that
gives an age out interrupt when the FDB entry is about to age out, so
that userspace can be notified of the entry being deleted with the help
of an SWITCHDEV_FDB_DEL_TO_BRIDGE event.
When adding a dynamic entry the bridge must be informed that the driver
takes care of the ageing be sending an SWITCHDEV_FDB_OFFLOADED event,
telling the bridge that this added FDB entry will be handled by the
driver.
With this implementation, trace events for age out interrupts are also
added.

note: A special case arises with the age out interrupt, as the entry
state/spid (source port id) value read from the registers will be zero.
Thus we need to extract the source port from the port vector instead.

Signed-off-by: Hans J. Schultz <redacted>
---
 drivers/net/dsa/mv88e6xxx/chip.c        | 18 ++++++--
 drivers/net/dsa/mv88e6xxx/global1_atu.c | 21 +++++++++
 drivers/net/dsa/mv88e6xxx/port.c        |  6 ++-
 drivers/net/dsa/mv88e6xxx/switchdev.c   | 61 +++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/switchdev.h   |  5 ++
 drivers/net/dsa/mv88e6xxx/trace.h       |  5 ++
 6 files changed, 110 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 61d5dc4680e3..a0007d96b2a3 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c

@@ -42,6 +42,7 @@
 #include "ptp.h"
 #include "serdes.h"
 #include "smi.h"
+#include "switchdev.h"
 
 static void assert_reg_lock(struct mv88e6xxx_chip *chip)
 {

@@ -2726,18 +2727,25 @@ static int mv88e6xxx_port_fdb_add(struct dsa_switch *ds, int port,
 				  const unsigned char *addr, u16 vid,
 				  u16 fdb_flags, struct dsa_db db)
 {
+	bool is_dynamic = !!(fdb_flags & DSA_FDB_FLAG_DYNAMIC);
 	struct mv88e6xxx_chip *chip = ds->priv;
+	u8 state;
 	int err;
 
-	/* Ignore entries with flags set */
-	if (fdb_flags)
-		return 0;
+	state = MV88E6XXX_G1_ATU_DATA_STATE_UC_STATIC;
+	if (is_dynamic)
+		state = MV88E6XXX_G1_ATU_DATA_STATE_UC_AGE_7_NEWEST;