Merge branch 'mlxsw-cleanups'

Petr Machata says:

====================
mlxsw: Cleanups in router code

This patchset moves some router-related code from spectrum.c to
spectrum_router.c where it should be. It also simplifies handlers of
netevent notifications.

- Patch #1 caches router pointer in a dedicated variable. This obviates the
need to access the same as mlxsw_sp->router, making lines shorter, and
permitting a future patch to add code that fits within 80 character
limit.

- Patch #2 moves IP / IPv6 validation notifier blocks from spectrum.c
to spectrum_router, where the handlers are anyway.

- In patch #3, pass router pointer to scheduler of deferred work directly,
instead of having it deduce it on its own.

- This makes the router pointer available in the handler function
mlxsw_sp_router_netevent_event(), so in patch #4, use it directly,
instead of finding it through mlxsw_sp_port.

- In patch #5, extend mlxsw_sp_router_schedule_work() so that the
NETEVENT_NEIGH_UPDATE handler can use it directly instead of inlining
equivalent code.

- In patches #6 and #7, add helpers for two common operations involving
a backing netdev of a RIF. This makes it unnecessary for the function
mlxsw_sp_rif_dev() to be visible outside of the router module, so in
patch #8, hide it.
====================

Signed-off-by: David S. Miller <[e-mail]>

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

···
 	return notifier_from_errno(err);
 }
 
-static struct notifier_block mlxsw_sp_inetaddr_valid_nb __read_mostly = {
-	.notifier_call = mlxsw_sp_inetaddr_valid_event,
-};
-
-static struct notifier_block mlxsw_sp_inet6addr_valid_nb __read_mostly = {
-	.notifier_call = mlxsw_sp_inet6addr_valid_event,
-};
-
 static const struct pci_device_id mlxsw_sp1_pci_id_table[] = {
 	{PCI_VDEVICE(MELLANOX, PCI_DEVICE_ID_MELLANOX_SPECTRUM), 0},
 	{0, },
···
 {
 	int err;
 
-	register_inetaddr_validator_notifier(&mlxsw_sp_inetaddr_valid_nb);
-	register_inet6addr_validator_notifier(&mlxsw_sp_inet6addr_valid_nb);
-
 	err = mlxsw_core_driver_register(&mlxsw_sp1_driver);
 	if (err)
-		goto err_sp1_core_driver_register;
+		return err;
 
 	err = mlxsw_core_driver_register(&mlxsw_sp2_driver);
 	if (err)
···
 	mlxsw_core_driver_unregister(&mlxsw_sp2_driver);
 err_sp2_core_driver_register:
 	mlxsw_core_driver_unregister(&mlxsw_sp1_driver);
-err_sp1_core_driver_register:
-	unregister_inet6addr_validator_notifier(&mlxsw_sp_inet6addr_valid_nb);
-	unregister_inetaddr_validator_notifier(&mlxsw_sp_inetaddr_valid_nb);
 	return err;
 }
 
···
 	mlxsw_core_driver_unregister(&mlxsw_sp3_driver);
 	mlxsw_core_driver_unregister(&mlxsw_sp2_driver);
 	mlxsw_core_driver_unregister(&mlxsw_sp1_driver);
-	unregister_inet6addr_validator_notifier(&mlxsw_sp_inet6addr_valid_nb);
-	unregister_inetaddr_validator_notifier(&mlxsw_sp_inetaddr_valid_nb);
 }
 
 module_init(mlxsw_sp_module_init);

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

···
 void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_rif_macvlan_del(struct mlxsw_sp *mlxsw_sp,
 			      const struct net_device *macvlan_dev);
-int mlxsw_sp_inetaddr_valid_event(struct notifier_block *unused,
-				  unsigned long event, void *ptr);
-int mlxsw_sp_inet6addr_valid_event(struct notifier_block *unused,
-				   unsigned long event, void *ptr);
 int
 mlxsw_sp_port_vlan_router_join(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan,
 			       struct net_device *l3_dev,

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

···
 	for (; i < rif_count; i++) {
 		struct mlxsw_sp_rif *rif = mlxsw_sp_rif_by_index(mlxsw_sp, i);
 
-		if (!rif || !mlxsw_sp_rif_dev(rif))
+		if (!rif || !mlxsw_sp_rif_has_dev(rif))
 			continue;
 		err = mlxsw_sp_erif_entry_get(mlxsw_sp, &entry, rif,
 					      counters_enabled);

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

···
 
 static struct mlxsw_sp_mr_vif *
 mlxsw_sp_mr_dev_vif_lookup(struct mlxsw_sp_mr_table *mr_table,
-			   const struct net_device *dev)
+			   const struct mlxsw_sp_rif *rif)
 {
 	vifi_t vif_index;
 
 	for (vif_index = 0; vif_index < MAXVIFS; vif_index++)
-		if (mr_table->vifs[vif_index].dev == dev)
+		if (mlxsw_sp_rif_dev_is(rif, mr_table->vifs[vif_index].dev))
 			return &mr_table->vifs[vif_index];
 	return NULL;
 }
···
 int mlxsw_sp_mr_rif_add(struct mlxsw_sp_mr_table *mr_table,
 			const struct mlxsw_sp_rif *rif)
 {
-	const struct net_device *rif_dev = mlxsw_sp_rif_dev(rif);
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return 0;
 
-	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif_dev);
+	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif);
 	if (!mr_vif)
 		return 0;
 	return mlxsw_sp_mr_vif_resolve(mr_table, mr_vif->dev, mr_vif,
···
 void mlxsw_sp_mr_rif_del(struct mlxsw_sp_mr_table *mr_table,
 			 const struct mlxsw_sp_rif *rif)
 {
-	const struct net_device *rif_dev = mlxsw_sp_rif_dev(rif);
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return;
 
-	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif_dev);
+	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif);
 	if (!mr_vif)
 		return;
 	mlxsw_sp_mr_vif_unresolve(mr_table, mr_vif->dev, mr_vif);
···
 void mlxsw_sp_mr_rif_mtu_update(struct mlxsw_sp_mr_table *mr_table,
 				const struct mlxsw_sp_rif *rif, int mtu)
 {
-	const struct net_device *rif_dev = mlxsw_sp_rif_dev(rif);
 	struct mlxsw_sp *mlxsw_sp = mr_table->mlxsw_sp;
 	struct mlxsw_sp_mr_route_vif_entry *rve;
 	struct mlxsw_sp_mr *mr = mlxsw_sp->mr;
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return;
 
 	/* Search for a VIF that use that RIF */
-	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif_dev);
+	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif);
 	if (!mr_vif)
 		return;
 

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

···
 }
 
 static int mlxsw_sp_router_schedule_work(struct net *net,
-					 struct notifier_block *nb,
+					 struct mlxsw_sp_router *router,
+					 struct neighbour *n,
 					 void (*cb)(struct work_struct *))
 {
 	struct mlxsw_sp_netevent_work *net_work;
-	struct mlxsw_sp_router *router;
 
-	router = container_of(nb, struct mlxsw_sp_router, netevent_nb);
 	if (!net_eq(net, mlxsw_sp_net(router->mlxsw_sp)))
 		return NOTIFY_DONE;
 
···
 
 	INIT_WORK(&net_work->work, cb);
 	net_work->mlxsw_sp = router->mlxsw_sp;
+	net_work->n = n;
 	mlxsw_core_schedule_work(&net_work->work);
 	return NOTIFY_DONE;
+}
+
+static bool mlxsw_sp_dev_lower_is_port(struct net_device *dev)
+{
+	struct mlxsw_sp_port *mlxsw_sp_port;
+
+	rcu_read_lock();
+	mlxsw_sp_port = mlxsw_sp_port_dev_lower_find_rcu(dev);
+	rcu_read_unlock();
+	return !!mlxsw_sp_port;
 }
 
 static int mlxsw_sp_router_netevent_event(struct notifier_block *nb,
 					  unsigned long event, void *ptr)
 {
-	struct mlxsw_sp_netevent_work *net_work;
-	struct mlxsw_sp_port *mlxsw_sp_port;
-	struct mlxsw_sp *mlxsw_sp;
+	struct mlxsw_sp_router *router;
 	unsigned long interval;
 	struct neigh_parms *p;
 	struct neighbour *n;
+	struct net *net;
+
+	router = container_of(nb, struct mlxsw_sp_router, netevent_nb);
 
 	switch (event) {
 	case NETEVENT_DELAY_PROBE_TIME_UPDATE:
···
 		/* We are in atomic context and can't take RTNL mutex,
 		 * so use RCU variant to walk the device chain.
 		 */
-		mlxsw_sp_port = mlxsw_sp_port_lower_dev_hold(p->dev);
-		if (!mlxsw_sp_port)
+		if (!mlxsw_sp_dev_lower_is_port(p->dev))
 			return NOTIFY_DONE;
 
-		mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 		interval = jiffies_to_msecs(NEIGH_VAR(p, DELAY_PROBE_TIME));
-		mlxsw_sp->router->neighs_update.interval = interval;
-
-		mlxsw_sp_port_dev_put(mlxsw_sp_port);
+		router->neighs_update.interval = interval;
 		break;
 	case NETEVENT_NEIGH_UPDATE:
 		n = ptr;
+		net = neigh_parms_net(n->parms);
 
 		if (n->tbl->family != AF_INET && n->tbl->family != AF_INET6)
 			return NOTIFY_DONE;
 
-		mlxsw_sp_port = mlxsw_sp_port_lower_dev_hold(n->dev);
-		if (!mlxsw_sp_port)
+		if (!mlxsw_sp_dev_lower_is_port(n->dev))
 			return NOTIFY_DONE;
-
-		net_work = kzalloc(sizeof(*net_work), GFP_ATOMIC);
-		if (!net_work) {
-			mlxsw_sp_port_dev_put(mlxsw_sp_port);
-			return NOTIFY_BAD;
-		}
-
-		INIT_WORK(&net_work->work, mlxsw_sp_router_neigh_event_work);
-		net_work->mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
-		net_work->n = n;
 
 		/* Take a reference to ensure the neighbour won't be
 		 * destructed until we drop the reference in delayed
 		 * work.
 		 */
 		neigh_clone(n);
-		mlxsw_core_schedule_work(&net_work->work);
-		mlxsw_sp_port_dev_put(mlxsw_sp_port);
-		break;
+		return mlxsw_sp_router_schedule_work(net, router, n,
+				mlxsw_sp_router_neigh_event_work);
+
 	case NETEVENT_IPV4_MPATH_HASH_UPDATE:
 	case NETEVENT_IPV6_MPATH_HASH_UPDATE:
-		return mlxsw_sp_router_schedule_work(ptr, nb,
+		return mlxsw_sp_router_schedule_work(ptr, router, NULL,
 				mlxsw_sp_router_mp_hash_event_work);
 
 	case NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE:
-		return mlxsw_sp_router_schedule_work(ptr, nb,
+		return mlxsw_sp_router_schedule_work(ptr, router, NULL,
 				mlxsw_sp_router_update_priority_work);
 	}
 
···
 
 	for (i = 0; i < max_rifs; i++)
 		if (mlxsw_sp->router->rifs[i] &&
-		    mlxsw_sp->router->rifs[i]->dev == dev)
+		    mlxsw_sp_rif_dev_is(mlxsw_sp->router->rifs[i], dev))
 			return mlxsw_sp->router->rifs[i];
 
 	return NULL;
···
 	return rif->dev->ifindex;
 }
 
-const struct net_device *mlxsw_sp_rif_dev(const struct mlxsw_sp_rif *rif)
+static const struct net_device *mlxsw_sp_rif_dev(const struct mlxsw_sp_rif *rif)
 {
 	return rif->dev;
+}
+
+bool mlxsw_sp_rif_has_dev(const struct mlxsw_sp_rif *rif)
+{
+	return !!mlxsw_sp_rif_dev(rif);
+}
+
+bool mlxsw_sp_rif_dev_is(const struct mlxsw_sp_rif *rif,
+			 const struct net_device *dev)
+{
+	return mlxsw_sp_rif_dev(rif) == dev;
 }
 
 static void mlxsw_sp_rif_push_l3_stats(struct mlxsw_sp_rif *rif)
···
 	return notifier_from_errno(err);
 }
 
-int mlxsw_sp_inetaddr_valid_event(struct notifier_block *unused,
-				  unsigned long event, void *ptr)
+static int mlxsw_sp_inetaddr_valid_event(struct notifier_block *unused,
+					 unsigned long event, void *ptr)
 {
 	struct in_validator_info *ivi = (struct in_validator_info *) ptr;
 	struct net_device *dev = ivi->ivi_dev->dev;
···
 	return NOTIFY_DONE;
 }
 
-int mlxsw_sp_inet6addr_valid_event(struct notifier_block *unused,
-				   unsigned long event, void *ptr)
+static int mlxsw_sp_inet6addr_valid_event(struct notifier_block *unused,
+					  unsigned long event, void *ptr)
 {
 	struct in6_validator_info *i6vi = (struct in6_validator_info *) ptr;
 	struct net_device *dev = i6vi->i6vi_dev->dev;
···
 			 struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp_router *router;
+	struct notifier_block *nb;
 	int err;
 
 	router = kzalloc(sizeof(*mlxsw_sp->router), GFP_KERNEL);
···
 	if (err)
 		goto err_register_inet6addr_notifier;
 
+	router->inetaddr_valid_nb.notifier_call = mlxsw_sp_inetaddr_valid_event;
+	err = register_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
+	if (err)
+		goto err_register_inetaddr_valid_notifier;
+
+	nb = &router->inet6addr_valid_nb;
+	nb->notifier_call = mlxsw_sp_inet6addr_valid_event;
+	err = register_inet6addr_validator_notifier(nb);
+	if (err)
+		goto err_register_inet6addr_valid_notifier;
+
 	mlxsw_sp->router->netevent_nb.notifier_call =
 		mlxsw_sp_router_netevent_event;
 	err = register_netevent_notifier(&mlxsw_sp->router->netevent_nb);
···
 err_register_nexthop_notifier:
 	unregister_netevent_notifier(&mlxsw_sp->router->netevent_nb);
 err_register_netevent_notifier:
+	unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
+err_register_inet6addr_valid_notifier:
+	unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
+err_register_inetaddr_valid_notifier:
 	unregister_inet6addr_notifier(&router->inet6addr_nb);
 err_register_inet6addr_notifier:
 	unregister_inetaddr_notifier(&router->inetaddr_nb);
···
 
 void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 {
+	struct mlxsw_sp_router *router = mlxsw_sp->router;
+
 	unregister_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
-					  &mlxsw_sp->router->netdevice_nb);
-	unregister_fib_notifier(mlxsw_sp_net(mlxsw_sp),
-				&mlxsw_sp->router->fib_nb);
+					  &router->netdevice_nb);
+	unregister_fib_notifier(mlxsw_sp_net(mlxsw_sp), &router->fib_nb);
 	unregister_nexthop_notifier(mlxsw_sp_net(mlxsw_sp),
-				    &mlxsw_sp->router->nexthop_nb);
-	unregister_netevent_notifier(&mlxsw_sp->router->netevent_nb);
-	unregister_inet6addr_notifier(&mlxsw_sp->router->inet6addr_nb);
-	unregister_inetaddr_notifier(&mlxsw_sp->router->inetaddr_nb);
+				    &router->nexthop_nb);
+	unregister_netevent_notifier(&router->netevent_nb);
+	unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
+	unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
+	unregister_inet6addr_notifier(&router->inet6addr_nb);
+	unregister_inetaddr_notifier(&router->inetaddr_nb);
 	mlxsw_core_flush_owq();
 	mlxsw_sp_mp_hash_fini(mlxsw_sp);
 	mlxsw_sp_neigh_fini(mlxsw_sp);
···
 	mlxsw_sp_vrs_fini(mlxsw_sp);
 	mlxsw_sp_mr_fini(mlxsw_sp);
 	mlxsw_sp_lpm_fini(mlxsw_sp);
-	rhashtable_destroy(&mlxsw_sp->router->nexthop_group_ht);
-	rhashtable_destroy(&mlxsw_sp->router->nexthop_ht);
+	rhashtable_destroy(&router->nexthop_group_ht);
+	rhashtable_destroy(&router->nexthop_ht);
 	mlxsw_sp_ipips_fini(mlxsw_sp);
 	mlxsw_sp_rifs_fini(mlxsw_sp);
 	__mlxsw_sp_router_fini(mlxsw_sp);
-	cancel_delayed_work_sync(&mlxsw_sp->router->nh_grp_activity_dw);
-	mutex_destroy(&mlxsw_sp->router->lock);
-	kfree(mlxsw_sp->router);
+	cancel_delayed_work_sync(&router->nh_grp_activity_dw);
+	mutex_destroy(&router->lock);
+	kfree(router);
 }

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

···
 	struct notifier_block inetaddr_nb;
 	struct notifier_block inet6addr_nb;
 	struct notifier_block netdevice_nb;
+	struct notifier_block inetaddr_valid_nb;
+	struct notifier_block inet6addr_valid_nb;
 	const struct mlxsw_sp_rif_ops **rif_ops_arr;
 	const struct mlxsw_sp_ipip_ops **ipip_ops_arr;
 	struct mlxsw_sp_router_nve_decap nve_decap_config;
···
 u16 mlxsw_sp_ipip_lb_ul_rif_id(const struct mlxsw_sp_rif_ipip_lb *lb_rif);
 u32 mlxsw_sp_ipip_dev_ul_tb_id(const struct net_device *ol_dev);
 int mlxsw_sp_rif_dev_ifindex(const struct mlxsw_sp_rif *rif);
-const struct net_device *mlxsw_sp_rif_dev(const struct mlxsw_sp_rif *rif);
+bool mlxsw_sp_rif_has_dev(const struct mlxsw_sp_rif *rif);
+bool mlxsw_sp_rif_dev_is(const struct mlxsw_sp_rif *rif,
+			 const struct net_device *dev);
 int mlxsw_sp_rif_counter_value_get(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_rif *rif,
 				   enum mlxsw_sp_rif_counter_dir dir,