net: Make NETDEV_XXX commands enum { }

This patch is preparation to drop NETDEV_UNREGISTER_FINAL.
Since the cmd is used in usnic_ib_netdev_event_to_string()
to get cmd name, after plain removing NETDEV_UNREGISTER_FINAL
from everywhere, we'd have holes in event2str[] in this
function.

Instead of that, let's make NETDEV_XXX commands names
available for everyone, and to define netdev_cmd_to_name()
in the way we won't have to shaffle names after their
numbers are changed.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/usnic/usnic_ib_main.c

@@ -97,20 +97,7 @@ 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];
+	return netdev_cmd_to_name(event);
 }
 
 static void usnic_ib_qp_grp_modify_active_to_err(struct usnic_ib_dev *us_ibdev)

include/linux/netdevice.h

@@ -2312,43 +2312,46 @@ 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_UNREGISTER_FINAL,
+	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);

net/core/dev.c

@@ -1571,6 +1571,26 @@ 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)
+	N(UNREGISTER_FINAL)
+	};
+#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)
 {