nfp: flower: handle notifiers for ipv6 route changes

A notifier is used to track route changes in the kernel. If a change is
made to a route that is offloaded to fw then an update is sent to the NIC.
The driver tracks all routes that are offloaded to determine if a kernel
change is of interest.

Extend the notifier to track IPv6 route changes and create a new list that
stores offloaded IPv6 routes. Modify the IPv4 route helper functions to
accept varying address lengths. This way, the same core functions can be
used to handle IPv4 and IPv6.
Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/main.h

@@ -64,10 +64,12 @@ struct nfp_fl_stats_id {
  * @offloaded_macs:	Hashtable of the offloaded MAC addresses
  * @ipv4_off_list:	List of IPv4 addresses to offload
  * @ipv6_off_list:	List of IPv6 addresses to offload
- * @neigh_off_list:	List of neighbour offloads
+ * @neigh_off_list_v4:	List of IPv4 neighbour offloads
+ * @neigh_off_list_v6:	List of IPv6 neighbour offloads
  * @ipv4_off_lock:	Lock for the IPv4 address list
  * @ipv6_off_lock:	Lock for the IPv6 address list
- * @neigh_off_lock:	Lock for the neighbour address list
+ * @neigh_off_lock_v4:	Lock for the IPv4 neighbour address list
+ * @neigh_off_lock_v6:	Lock for the IPv6 neighbour address list
  * @mac_off_ids:	IDA to manage id assignment for offloaded MACs
  * @neigh_nb:		Notifier to monitor neighbour state
  */
@@ -75,10 +77,12 @@ struct nfp_fl_tunnel_offloads {
 	struct rhashtable offloaded_macs;
 	struct list_head ipv4_off_list;
 	struct list_head ipv6_off_list;
-	struct list_head neigh_off_list;
+	struct list_head neigh_off_list_v4;
+	struct list_head neigh_off_list_v6;
 	struct mutex ipv4_off_lock;
 	struct mutex ipv6_off_lock;
-	spinlock_t neigh_off_lock;
+	spinlock_t neigh_off_lock_v4;
+	spinlock_t neigh_off_lock_v6;
 	struct ida mac_off_ids;
 	struct notifier_block neigh_nb;
 };