netdev - [PATCHv2 net 1/2] netdevice.h: add netdev_level

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Date:   Fri,  9 Aug 2019 08:29:40 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Joe Perches <joe@...ches.com>,
        Thomas Falcon <tlfalcon@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv2 net 1/2] netdevice.h: add netdev_level_ratelimited for netdevice

Add netdev_level_ratelimited so we can use it in the future.
The code is copied from device.h.

Suggested-by: Joe Perches <joe@...ches.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 include/linux/netdevice.h | 53 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 88292953aa6f..4e37065c6717 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4737,6 +4737,59 @@ do {								\
 #define netdev_info_once(dev, fmt, ...) \
 	netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)
 
+#define netdev_level_ratelimited(netdev_level, dev, fmt, ...)		\
+do {									\
+	static DEFINE_RATELIMIT_STATE(_rs,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+	if (__ratelimit(&_rs))						\
+		netdev_level(dev, fmt, ##__VA_ARGS__);			\
+} while (0)
+
+#define netdev_emerg_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_emerg, dev, fmt, ##__VA_ARGS__)
+#define netdev_alert_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_alert, dev, fmt, ##__VA_ARGS__)
+#define netdev_crit_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_crit, dev, fmt, ##__VA_ARGS__)
+#define netdev_err_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_err, dev, fmt, ##__VA_ARGS__)
+#define netdev_warn_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_warn, dev, fmt, ##__VA_ARGS__)
+#define netdev_notice_ratelimited(dev, fmt, ...)			\
+	netdev_level_ratelimited(netdev_notice, dev, fmt, ##__VA_ARGS__)
+#define netdev_info_ratelimited(dev, fmt, ...)				\
+	netdev_level_ratelimited(netdev_info, dev, fmt, ##__VA_ARGS__)
+#if defined(CONFIG_DYNAMIC_DEBUG)
+/* descriptor check is first to prevent flooding with "callbacks suppressed" */
+#define netdev_dbg_ratelimited(dev, fmt, ...)				\
+do {									\
+	static DEFINE_RATELIMIT_STATE(_rs,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\
+	if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\
+	    __ratelimit(&_rs))						\
+		__dynamic_netdev_dbg(&descriptor, dev, dev_fmt(fmt),	\
+				     ##__VA_ARGS__);			\
+} while (0)
+#elif defined(DEBUG)
+#define netdev_dbg_ratelimited(dev, fmt, ...)				\
+do {									\
+	static DEFINE_RATELIMIT_STATE(_rs,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+	if (__ratelimit(&_rs))						\
+		netdev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+} while (0)
+#else
+#define netdev_dbg_ratelimited(dev, fmt, ...)				\
+do {									\
+	if (0)								\
+		netdev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+} while (0)
+#endif
+
 #define MODULE_ALIAS_NETDEV(device) \
 	MODULE_ALIAS("netdev-" device)
 
-- 
2.19.2