Merge branch 'Drop-NETDEV_UNREGISTER_FINAL'

Kirill Tkhai says:

====================
Drop NETDEV_UNREGISTER_FINAL (was unnamed)

This series drops unused NETDEV_UNREGISTER_FINAL
after some preparations.

v2: New patch [2/3]. Use switch() in [1/3].

The first version was acked by Jason Gunthorpe,
and [1/3] was acked by David Ahern.

Since there are differences to v1, I haven't added
Acked-by tags of people. It would be nice, if you
fill OK to tag v2 too.
====================
Acked-by: Jason Gunthorpe <jgg@mellanox>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/qedr/main.c

@@ -90,8 +90,8 @@ static struct net_device *qedr_get_netdev(struct ib_device *dev, u8 port_num)
 	dev_hold(qdev->ndev);
 
 	/* The HW vendor's device driver must guarantee
-	 * that this function returns NULL before the net device reaches
-	 * NETDEV_UNREGISTER_FINAL state.
+	 * that this function returns NULL before the net device has finished
+	 * NETDEV_UNREGISTER state.
 	 */
 	return qdev->ndev;
 }

drivers/infiniband/hw/usnic/usnic_ib_main.c

@@ -95,24 +95,6 @@ void usnic_ib_log_vf(struct usnic_ib_vf *vf)
 }
 
 /* Start of netdev section */
-static inline const char *usnic_ib_netdev_event_to_string(unsigned long event)
-{
-	const char *event2str[] = {"NETDEV_NONE", "NETDEV_UP", "NETDEV_DOWN",
-		"NETDEV_REBOOT", "NETDEV_CHANGE",
-		"NETDEV_REGISTER", "NETDEV_UNREGISTER", "NETDEV_CHANGEMTU",
-		"NETDEV_CHANGEADDR", "NETDEV_GOING_DOWN", "NETDEV_FEAT_CHANGE",
-		"NETDEV_BONDING_FAILOVER", "NETDEV_PRE_UP",
-		"NETDEV_PRE_TYPE_CHANGE", "NETDEV_POST_TYPE_CHANGE",
-		"NETDEV_POST_INT", "NETDEV_UNREGISTER_FINAL", "NETDEV_RELEASE",
-		"NETDEV_NOTIFY_PEERS", "NETDEV_JOIN"
-	};
-
-	if (event >= ARRAY_SIZE(event2str))
-		return "UNKNOWN_NETDEV_EVENT";
-	else
-		return event2str[event];
-}
-
 static void usnic_ib_qp_grp_modify_active_to_err(struct usnic_ib_dev *us_ibdev)
 {
 	struct usnic_ib_ucontext *ctx;
@@ -185,7 +167,7 @@ static void usnic_ib_handle_usdev_event(struct usnic_ib_dev *us_ibdev,
 			ib_dispatch_event(&ib_event);
 		} else {
 			usnic_dbg("Ignoring %s on %s\n",
-					usnic_ib_netdev_event_to_string(event),
+					netdev_cmd_to_name(event),
 					us_ibdev->ib_dev.name);
 		}
 		break;
@@ -222,7 +204,7 @@ static void usnic_ib_handle_usdev_event(struct usnic_ib_dev *us_ibdev,
 		break;
 	default:
 		usnic_dbg("Ignoring event %s on %s",
-				usnic_ib_netdev_event_to_string(event),
+				netdev_cmd_to_name(event),
 				us_ibdev->ib_dev.name);
 	}
 	mutex_unlock(&us_ibdev->usdev_lock);
@@ -264,7 +246,7 @@ static int usnic_ib_handle_inet_event(struct usnic_ib_dev *us_ibdev,
 	switch (event) {
 	case NETDEV_DOWN:
 		usnic_info("%s via ip notifiers",
-				usnic_ib_netdev_event_to_string(event));
+				netdev_cmd_to_name(event));
 		usnic_fwd_del_ipaddr(us_ibdev->ufdev);
 		usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 		ib_event.event = IB_EVENT_GID_CHANGE;
@@ -275,7 +257,7 @@ static int usnic_ib_handle_inet_event(struct usnic_ib_dev *us_ibdev,
 	case NETDEV_UP:
 		usnic_fwd_add_ipaddr(us_ibdev->ufdev, ifa->ifa_address);
 		usnic_info("%s via ip notifiers: ip %pI4",
-				usnic_ib_netdev_event_to_string(event),
+				netdev_cmd_to_name(event),
 				&us_ibdev->ufdev->inaddr);
 		ib_event.event = IB_EVENT_GID_CHANGE;
 		ib_event.device = &us_ibdev->ib_dev;
@@ -284,7 +266,7 @@ static int usnic_ib_handle_inet_event(struct usnic_ib_dev *us_ibdev,
 		break;
 	default:
 		usnic_info("Ignoring event %s on %s",
-				usnic_ib_netdev_event_to_string(event),
+				netdev_cmd_to_name(event),
 				us_ibdev->ib_dev.name);
 	}
 	mutex_unlock(&us_ibdev->usdev_lock);

include/linux/netdevice.h

@@ -2312,43 +2312,45 @@ struct netdev_lag_lower_state_info {
 
 #include <linux/notifier.h>
 
-/* netdevice notifier chain. Please remember to update the rtnetlink
- * notification exclusion list in rtnetlink_event() when adding new
- * types.
+/* netdevice notifier chain. Please remember to update netdev_cmd_to_name()
+ * and the rtnetlink notification exclusion list in rtnetlink_event() when
+ * adding new types.
  */
-#define NETDEV_UP	0x0001	/* For now you can't veto a device up/down */
-#define NETDEV_DOWN	0x0002
-#define NETDEV_REBOOT	0x0003	/* Tell a protocol stack a network interface
+enum netdev_cmd {
+	NETDEV_UP	= 1,	/* For now you can't veto a device up/down */
+	NETDEV_DOWN,
+	NETDEV_REBOOT,		/* Tell a protocol stack a network interface
 				   detected a hardware crash and restarted
 				   - we can use this eg to kick tcp sessions
 				   once done */
-#define NETDEV_CHANGE	0x0004	/* Notify device state change */
-#define NETDEV_REGISTER 0x0005
-#define NETDEV_UNREGISTER	0x0006
-#define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
-#define NETDEV_CHANGEADDR	0x0008
-#define NETDEV_GOING_DOWN	0x0009
-#define NETDEV_CHANGENAME	0x000A
-#define NETDEV_FEAT_CHANGE	0x000B
-#define NETDEV_BONDING_FAILOVER 0x000C
-#define NETDEV_PRE_UP		0x000D
-#define NETDEV_PRE_TYPE_CHANGE	0x000E
-#define NETDEV_POST_TYPE_CHANGE	0x000F
-#define NETDEV_POST_INIT	0x0010
-#define NETDEV_UNREGISTER_FINAL 0x0011
-#define NETDEV_RELEASE		0x0012
-#define NETDEV_NOTIFY_PEERS	0x0013
-#define NETDEV_JOIN		0x0014
-#define NETDEV_CHANGEUPPER	0x0015
-#define NETDEV_RESEND_IGMP	0x0016
-#define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
-#define NETDEV_CHANGEINFODATA	0x0018
-#define NETDEV_BONDING_INFO	0x0019
-#define NETDEV_PRECHANGEUPPER	0x001A
-#define NETDEV_CHANGELOWERSTATE	0x001B
-#define NETDEV_UDP_TUNNEL_PUSH_INFO	0x001C
-#define NETDEV_UDP_TUNNEL_DROP_INFO	0x001D
-#define NETDEV_CHANGE_TX_QUEUE_LEN	0x001E
+	NETDEV_CHANGE,		/* Notify device state change */
+	NETDEV_REGISTER,
+	NETDEV_UNREGISTER,
+	NETDEV_CHANGEMTU,	/* notify after mtu change happened */
+	NETDEV_CHANGEADDR,
+	NETDEV_GOING_DOWN,
+	NETDEV_CHANGENAME,
+	NETDEV_FEAT_CHANGE,
+	NETDEV_BONDING_FAILOVER,
+	NETDEV_PRE_UP,
+	NETDEV_PRE_TYPE_CHANGE,
+	NETDEV_POST_TYPE_CHANGE,
+	NETDEV_POST_INIT,
+	NETDEV_RELEASE,
+	NETDEV_NOTIFY_PEERS,
+	NETDEV_JOIN,
+	NETDEV_CHANGEUPPER,
+	NETDEV_RESEND_IGMP,
+	NETDEV_PRECHANGEMTU,	/* notify before mtu change happened */
+	NETDEV_CHANGEINFODATA,
+	NETDEV_BONDING_INFO,
+	NETDEV_PRECHANGEUPPER,
+	NETDEV_CHANGELOWERSTATE,
+	NETDEV_UDP_TUNNEL_PUSH_INFO,
+	NETDEV_UDP_TUNNEL_DROP_INFO,
+	NETDEV_CHANGE_TX_QUEUE_LEN,
+};
+const char *netdev_cmd_to_name(enum netdev_cmd cmd);
 
 int register_netdevice_notifier(struct notifier_block *nb);
 int unregister_netdevice_notifier(struct notifier_block *nb);

include/rdma/ib_verbs.h

@@ -2122,8 +2122,8 @@ struct ib_device {
 	 * net device of device @device at port @port_num or NULL if such
 	 * a net device doesn't exist. The vendor driver should call dev_hold
 	 * on this net device. The HW vendor's device driver must guarantee
-	 * that this function returns NULL before the net device reaches
-	 * NETDEV_UNREGISTER_FINAL state.
+	 * that this function returns NULL before the net device has finished
+	 * NETDEV_UNREGISTER state.
 	 */
 	struct net_device	  *(*get_netdev)(struct ib_device *device,
 						 u8 port_num);

net/core/dev.c

@@ -1571,6 +1571,25 @@ static void dev_disable_gro_hw(struct net_device *dev)
 		netdev_WARN(dev, "failed to disable GRO_HW!\n");
 }
 
+const char *netdev_cmd_to_name(enum netdev_cmd cmd)
+{
+#define N(val) 						\
+	case NETDEV_##val:				\
+		return "NETDEV_" __stringify(val);
+	switch (cmd) {
+	N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER)
+	N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE)
+	N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE)
+	N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER)
+	N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO)
+	N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO)
+	N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
+	};
+#undef N
+	return "UNKNOWN_NETDEV_EVENT";
+}
+EXPORT_SYMBOL_GPL(netdev_cmd_to_name);
+
 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
 				   struct net_device *dev)
 {
@@ -8077,7 +8096,6 @@ static void netdev_wait_allrefs(struct net_device *dev)
 			rcu_barrier();
 			rtnl_lock();
 
-			call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
 			if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
 				     &dev->state)) {
 				/* We must not have linkwatch events
@@ -8149,10 +8167,6 @@ void netdev_run_todo(void)
 			= list_first_entry(&list, struct net_device, todo_list);
 		list_del(&dev->todo_list);
 
-		rtnl_lock();
-		call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
-		__rtnl_unlock();
-
 		if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
 			pr_err("network todo '%s' but state %d\n",
 			       dev->name, dev->reg_state);
@@ -8594,7 +8608,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 	 */
 	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
 	rcu_barrier();
-	call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
 
 	new_nsid = peernet2id_alloc(dev_net(dev), net);
 	/* If there is an ifindex conflict assign a new one */