net: dsa: felix: support FDB entries on offloaded LAG interfaces

This adds the logic in the Felix DSA driver and Ocelot switch library.
For Ocelot switches, the DEST_IDX that is the output of the MAC table
lookup is a logical port (equal to physical port, if no LAG is used, or
a dynamically allocated number otherwise). The allocation we have in
place for LAG IDs is different from DSA's, so we can't use that:
- DSA allocates a continuous range of LAG IDs starting from 1
- Ocelot appears to require that physical ports and LAG IDs are in the
  same space of [0, num_phys_ports), and additionally, ports that aren't
  in a LAG must have physical port id == logical port id

The implication is that an FDB entry towards a LAG might need to be
deleted and reinstalled when the LAG ID changes.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 78f56502bc09..dd4fc34d2992 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -635,6 +635,13 @@ enum macaccess_entry_type {
 #define OCELOT_QUIRK_PCS_PERFORMS_RATE_ADAPTATION	BIT(0)
 #define OCELOT_QUIRK_QSGMII_PORTS_MUST_BE_UP		BIT(1)
 
+struct ocelot_lag_fdb {
+	unsigned char addr[ETH_ALEN];
+	u16 vid;
+	struct net_device *bond;
+	struct list_head list;
+};
+
 struct ocelot_port {
 	struct ocelot			*ocelot;
 
@@ -690,6 +697,7 @@ struct ocelot {
 
 	struct list_head		vlans;
 	struct list_head		traps;
+	struct list_head		lag_fdbs;
 
 	/* Switches like VSC9959 have flooding per traffic class */
 	int				num_flooding_pgids;
@@ -866,6 +874,10 @@ int ocelot_fdb_add(struct ocelot *ocelot, int port,
 		   const unsigned char *addr, u16 vid);
 int ocelot_fdb_del(struct ocelot *ocelot, int port,
 		   const unsigned char *addr, u16 vid);
+int ocelot_lag_fdb_add(struct ocelot *ocelot, struct net_device *bond,
+		       const unsigned char *addr, u16 vid);
+int ocelot_lag_fdb_del(struct ocelot *ocelot, struct net_device *bond,
+		       const unsigned char *addr, u16 vid);
 int ocelot_vlan_prepare(struct ocelot *ocelot, int port, u16 vid, bool pvid,
 			bool untagged, struct netlink_ext_ack *extack);
 int ocelot_vlan_add(struct ocelot *ocelot, int port, u16 vid, bool pvid,