net: marvell: prestera: handle fib notifications

For now we support only TRAP or DROP, so we can offload only "local" or
"blackhole" routes.
Nexthop routes is TRAP for now. Will be implemented soon.

Co-developed-by: Taras Chornyi <tchornyi@marvell.com>
Signed-off-by: Taras Chornyi <tchornyi@marvell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/prestera.h

@@ -282,8 +282,10 @@ struct prestera_router {
 	struct list_head vr_list;
 	struct list_head rif_entry_list;
 	struct rhashtable fib_ht;
+	struct rhashtable kern_fib_cache_ht;
 	struct notifier_block inetaddr_nb;
 	struct notifier_block inetaddr_valid_nb;
+	struct notifier_block fib_nb;
 };
 
 struct prestera_rxtx_params {
@@ -326,6 +328,8 @@ int prestera_port_cfg_mac_write(struct prestera_port *port,
 
 struct prestera_port *prestera_port_dev_lower_find(struct net_device *dev);
 
+void prestera_queue_work(struct work_struct *work);
+
 int prestera_port_pvid_set(struct prestera_port *port, u16 vid);
 
 bool prestera_netdev_check(const struct net_device *dev);

drivers/net/ethernet/marvell/prestera/prestera_main.c

@@ -28,6 +28,12 @@
 #define PRESTERA_MAC_ADDR_NUM_MAX	255
 
 static struct workqueue_struct *prestera_wq;
+static struct workqueue_struct *prestera_owq;
+
+void prestera_queue_work(struct work_struct *work)
+{
+	queue_work(prestera_owq, work);
+}
 
 int prestera_port_pvid_set(struct prestera_port *port, u16 vid)
 {
@@ -1024,12 +1030,17 @@ static int __init prestera_module_init(void)
 	if (!prestera_wq)
 		return -ENOMEM;
 
+	prestera_owq = alloc_ordered_workqueue("prestera_ordered", 0);
+	if (!prestera_owq)
+		return -ENOMEM;
+
 	return 0;
 }
 
 static void __exit prestera_module_exit(void)
 {
 	destroy_workqueue(prestera_wq);
+	destroy_workqueue(prestera_owq);
 }
 
 module_init(prestera_module_init);