net: Introduce netdev_*_once functions

Extend the net device error logging with netdev_*_once macros.
netdev_*_once are the equivalents of the dev_*_once macros which are
useful for messages that should only be logged once.

Also add netdev_WARN_ONCE, which is the "once" extension for the already
existing netdev_WARN macro.

Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 30f0f29..79518ed 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4336,6 +4336,31 @@ void netdev_notice(const struct net_device *dev, const char *format, ...);
 __printf(2, 3)
 void netdev_info(const struct net_device *dev, const char *format, ...);
 
+#define netdev_level_once(level, dev, fmt, ...)                        \
+do {                                                           \
+       static bool __print_once __read_mostly;                 \
+                                                               \
+       if (!__print_once) {                                    \
+               __print_once = true;                            \
+               netdev_printk(level, dev, fmt, ##__VA_ARGS__);  \
+       }                                                       \
+} while (0)
+
+#define netdev_emerg_once(dev, fmt, ...) \
+       netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__)
+#define netdev_alert_once(dev, fmt, ...) \
+       netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__)
+#define netdev_crit_once(dev, fmt, ...) \
+       netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__)
+#define netdev_err_once(dev, fmt, ...) \
+       netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__)
+#define netdev_warn_once(dev, fmt, ...) \
+       netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__)
+#define netdev_notice_once(dev, fmt, ...) \
+       netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__)
+#define netdev_info_once(dev, fmt, ...) \
+       netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)
+
 #define MODULE_ALIAS_NETDEV(device) \
        MODULE_ALIAS("netdev-" device)
 
@@ -4376,6 +4401,10 @@ do {                                                             \
        WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),   \
             netdev_reg_state(dev), ##args)
 
+#define netdev_WARN_ONCE(dev, condition, format, arg...)               \
+       WARN_ONCE(1, "netdevice: %s%s\n" format, netdev_name(dev)       \
+                 netdev_reg_state(dev), ##args)
+
 /* netif printk helpers, similar to netdev_printk */
 
 #define netif_printk(priv, type, level, dev, fmt, args...)     \