mlxsw: spectrum: Add router interface struct

When enabling the router in the device we will represent L3 netdevs
using router interfaces (RIFs). These will be specified whenever
programming routes or neighbours on the netdev.

Introduce the basic RIF infrastructure which allows one to lookup a RIF
by its netdev. Later patches in the series will extend this, but the
basic routines are needed now in order to direct traffic to CPU.

Pointers to the RIF structs are stored in an array indexed by the RIF's
number. This will allow us to efficiently update the kernel's neighbour
table when regularly dumping the device's table.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -2470,6 +2470,7 @@ err_rx_listener_register:
 static void mlxsw_sp_fini(struct mlxsw_core *mlxsw_core)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+	int i;
 
 	mlxsw_sp_ports_remove(mlxsw_sp);
 	mlxsw_sp_router_fini(mlxsw_sp);
@@ -2478,6 +2479,8 @@ static void mlxsw_sp_fini(struct mlxsw_core *mlxsw_core)
 	mlxsw_sp_traps_fini(mlxsw_sp);
 	mlxsw_sp_event_unregister(mlxsw_sp, MLXSW_TRAP_ID_PUDE);
 	WARN_ON(!list_empty(&mlxsw_sp->fids));
+	for (i = 0; i < MLXSW_SP_RIF_MAX; i++)
+		WARN_ON_ONCE(mlxsw_sp->rifs[i]);
 }
 
 static struct mlxsw_config_profile mlxsw_sp_config_profile = {

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -98,6 +98,11 @@ struct mlxsw_sp_fid {
 	u16 vid;
 };
 
+struct mlxsw_sp_rif {
+	struct net_device *dev;
+	u16 rif;
+};
+
 struct mlxsw_sp_mid {
 	struct list_head list;
 	unsigned char addr[ETH_ALEN];
@@ -169,6 +174,7 @@ struct mlxsw_sp {
 		DECLARE_BITMAP(mapped, MLXSW_SP_MID_MAX);
 	} br_mids;
 	struct list_head fids;	/* VLAN-aware bridge FIDs */
+	struct mlxsw_sp_rif *rifs[MLXSW_SP_RIF_MAX];
 	struct mlxsw_sp_port **ports;
 	struct mlxsw_core *core;
 	const struct mlxsw_bus_info *bus_info;
@@ -327,6 +333,19 @@ mlxsw_sp_port_vport_find_by_fid(const struct mlxsw_sp_port *mlxsw_sp_port,
 	return NULL;
 }
 
+static inline struct mlxsw_sp_rif *
+mlxsw_sp_rif_find_by_dev(const struct mlxsw_sp *mlxsw_sp,
+			 const struct net_device *dev)
+{
+	int i;
+
+	for (i = 0; i < MLXSW_SP_RIF_MAX; i++)
+		if (mlxsw_sp->rifs[i] && mlxsw_sp->rifs[i]->dev == dev)
+			return mlxsw_sp->rifs[i];
+
+	return NULL;
+}
+
 enum mlxsw_sp_flood_table {
 	MLXSW_SP_FLOOD_TABLE_UC,
 	MLXSW_SP_FLOOD_TABLE_BM,