mlxsw: spectrum_router: Export IPv6 link local address check helper

Neighbors with link local addresses are not offloaded to the host table,
yet, the are maintained in the driver for adjacency table usage. When
dumping the IPv6 host neighbors this link local neighbors should be
ignored. This patch exports this helper for dpipe usage.
Signed-off-by: NArkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -1396,8 +1396,10 @@ mlxsw_sp_router_neigh_entry_op6(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rauht), rauht_pl);
 }
 
-static bool mlxsw_sp_neigh_ipv6_ignore(struct neighbour *n)
+bool mlxsw_sp_neigh_ipv6_ignore(struct mlxsw_sp_neigh_entry *neigh_entry)
 {
+	struct neighbour *n = neigh_entry->key.n;
+
 	/* Packets with a link-local destination address are trapped
 	 * after LPM lookup and never reach the neighbour table, so
 	 * there is no need to program such neighbours to the device.
@@ -1420,7 +1422,7 @@ mlxsw_sp_neigh_entry_update(struct mlxsw_sp *mlxsw_sp,
 		mlxsw_sp_router_neigh_entry_op4(mlxsw_sp, neigh_entry,
 						mlxsw_sp_rauht_op(adding));
 	} else if (neigh_entry->key.n->tbl->family == AF_INET6) {
-		if (mlxsw_sp_neigh_ipv6_ignore(neigh_entry->key.n))
+		if (mlxsw_sp_neigh_ipv6_ignore(neigh_entry))
 			return;
 		mlxsw_sp_router_neigh_entry_op6(mlxsw_sp, neigh_entry,
 						mlxsw_sp_rauht_op(adding));

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

@@ -76,5 +76,6 @@ void
 mlxsw_sp_neigh_entry_counter_update(struct mlxsw_sp *mlxsw_sp,
 				    struct mlxsw_sp_neigh_entry *neigh_entry,
 				    bool adding);
+bool mlxsw_sp_neigh_ipv6_ignore(struct mlxsw_sp_neigh_entry *neigh_entry);
 
 #endif /* _MLXSW_ROUTER_H_*/