mlxsw: spectrum_router: Associate neighbour table with nexthop instead of group

As explained in the previous patch, nexthop objects can have both IPv4
and IPv6 nexthops in the same group. Therefore, move the neighbour table
to be a property of the nexthop instead of the nexthop group.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -2835,6 +2835,7 @@ struct mlxsw_sp_nexthop {
 						* this belongs to
 						*/
 	struct rhash_head ht_node;
+	struct neigh_table *neigh_tbl;
 	struct mlxsw_sp_nexthop_key key;
 	unsigned char gw_addr[sizeof(struct in6_addr)];
 	int ifindex;
@@ -2869,7 +2870,6 @@ struct mlxsw_sp_nexthop_group {
 	void *priv;
 	struct rhash_head ht_node;
 	struct list_head fib_list; /* list of fib entries that use this group */
-	struct neigh_table *neigh_tbl;
 	enum mlxsw_sp_nexthop_group_type type;
 	u8 adj_index_valid:1,
 	   gateway:1; /* routes using the group use a gateway */
@@ -3674,10 +3674,9 @@ mlxsw_sp_nexthop_dead_neigh_replace(struct mlxsw_sp *mlxsw_sp,
 	nh = list_first_entry(&neigh_entry->nexthop_list,
 			      struct mlxsw_sp_nexthop, neigh_list_node);
 
-	n = neigh_lookup(nh->nh_grp->neigh_tbl, &nh->gw_addr, nh->rif->dev);
+	n = neigh_lookup(nh->neigh_tbl, &nh->gw_addr, nh->rif->dev);
 	if (!n) {
-		n = neigh_create(nh->nh_grp->neigh_tbl, &nh->gw_addr,
-				 nh->rif->dev);
+		n = neigh_create(nh->neigh_tbl, &nh->gw_addr, nh->rif->dev);
 		if (IS_ERR(n))
 			return PTR_ERR(n);
 		neigh_event_send(n, NULL);
@@ -3776,10 +3775,9 @@ static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
 	 * The reference is taken either in neigh_lookup() or
 	 * in neigh_create() in case n is not found.
 	 */
-	n = neigh_lookup(nh->nh_grp->neigh_tbl, &nh->gw_addr, nh->rif->dev);
+	n = neigh_lookup(nh->neigh_tbl, &nh->gw_addr, nh->rif->dev);
 	if (!n) {
-		n = neigh_create(nh->nh_grp->neigh_tbl, &nh->gw_addr,
-				 nh->rif->dev);
+		n = neigh_create(nh->neigh_tbl, &nh->gw_addr, nh->rif->dev);
 		if (IS_ERR(n))
 			return PTR_ERR(n);
 		neigh_event_send(n, NULL);
@@ -3968,6 +3966,7 @@ static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
 	nh->nh_weight = 1;
 #endif
 	memcpy(&nh->gw_addr, &fib_nh->fib_nh_gw4, sizeof(fib_nh->fib_nh_gw4));
+	nh->neigh_tbl = &arp_tbl;
 	err = mlxsw_sp_nexthop_insert(mlxsw_sp, nh);
 	if (err)
 		return err;
@@ -4104,7 +4103,6 @@ mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi)
 		return ERR_PTR(-ENOMEM);
 	nh_grp->priv = fi;
 	INIT_LIST_HEAD(&nh_grp->fib_list);
-	nh_grp->neigh_tbl = &arp_tbl;
 	nh_grp->type = MLXSW_SP_NEXTHOP_GROUP_TYPE_IPV4;
 
 	nh_grp->gateway = mlxsw_sp_fi_is_gateway(mlxsw_sp, fi);
@@ -5373,6 +5371,9 @@ static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
 	nh->nh_grp = nh_grp;
 	nh->nh_weight = rt->fib6_nh->fib_nh_weight;
 	memcpy(&nh->gw_addr, &rt->fib6_nh->fib_nh_gw6, sizeof(nh->gw_addr));
+#if IS_ENABLED(CONFIG_IPV6)
+	nh->neigh_tbl = &nd_tbl;
+#endif
 	mlxsw_sp_nexthop_counter_alloc(mlxsw_sp, nh);
 
 	list_add_tail(&nh->router_list_node, &mlxsw_sp->router->nexthop_list);
@@ -5414,9 +5415,6 @@ mlxsw_sp_nexthop6_group_create(struct mlxsw_sp *mlxsw_sp,
 	if (!nh_grp)
 		return ERR_PTR(-ENOMEM);
 	INIT_LIST_HEAD(&nh_grp->fib_list);
-#if IS_ENABLED(CONFIG_IPV6)
-	nh_grp->neigh_tbl = &nd_tbl;
-#endif
 	nh_grp->type = MLXSW_SP_NEXTHOP_GROUP_TYPE_IPV6;
 	mlxsw_sp_rt6 = list_first_entry(&fib6_entry->rt6_list,
 					struct mlxsw_sp_rt6, list);