net: print net_device reg_state in netdev_* unless it's registered

This way we'll always know in what status the device is, unless it's
running normally (i.e. NETDEV_REGISTERED).

Also, emit a warning once in case of a bad reg_state.

CC: "David S. Miller" <davem@davemloft.net>
CC: Jason Baron <jbaron@akamai.com>
CC: Eric Dumazet <edumazet@google.com>
CC: Vlad Yasevich <vyasevic@redhat.com>
CC: stephen hemminger <stephen@networkplumber.org>
CC: Jerry Chu <hkchu@google.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
CC: Joe Perches <joe@perches.com>
Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 27 insertions, 7 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 70256aa2ae81..8e8fb3ed574b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3388,6 +3388,21 @@ static inline const char *netdev_name(const struct net_device *dev)
         return dev->name;
 }
 
+static inline const char *netdev_reg_state(const struct net_device *dev)
+{
+        switch (dev->reg_state) {
+        case NETREG_UNINITIALIZED: return " (uninitialized)";
+        case NETREG_REGISTERED: return "";
+        case NETREG_UNREGISTERING: return " (unregistering)";
+        case NETREG_UNREGISTERED: return " (unregistered)";
+        case NETREG_RELEASED: return " (released)";
+        case NETREG_DUMMY: return " (dummy)";
+        }
+
+        WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
+        return " (unknown)";
+}
+
 __printf(3, 4)
 int netdev_printk(const char *level, const struct net_device *dev,
                   const char *format, ...);
@@ -3444,7 +3459,8 @@ do {								\
  * file/line information and a backtrace.
  */
 #define netdev_WARN(dev, format, args...)                       \
-        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args)
+        WARN(1, "netdevice: %s%s\n" format, netdev_name(dev),   \
+             netdev_reg_state(dev), ##args)
 
 /* netif printk helpers, similar to netdev_printk */
 
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 7288e38e1757..c9afbe2c445a 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -614,13 +614,15 @@ int __dynamic_netdev_dbg(struct _ddebug *descriptor,
                 char buf[PREFIX_SIZE];
 
                 res = dev_printk_emit(7, dev->dev.parent,
-                                      "%s%s %s %s: %pV",
+                                      "%s%s %s %s%s: %pV",
                                       dynamic_emit_prefix(descriptor, buf),
                                       dev_driver_string(dev->dev.parent),
                                       dev_name(dev->dev.parent),
-                                      netdev_name(dev), &vaf);
+                                      netdev_name(dev), netdev_reg_state(dev),
+                                      &vaf);
         } else if (dev) {
-                res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf);
+                res = printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
+                             netdev_reg_state(dev), &vaf);
         } else {
                 res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
         }
diff --git a/net/core/dev.c b/net/core/dev.c
index 239722af098d..81d61014fd9b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6950,12 +6950,14 @@ static int __netdev_printk(const char *level, const struct net_device *dev,
         if (dev && dev->dev.parent) {
                 r = dev_printk_emit(level[1] - '0',
                                     dev->dev.parent,
-                                    "%s %s %s: %pV",
+                                    "%s %s %s%s: %pV",
                                     dev_driver_string(dev->dev.parent),
                                     dev_name(dev->dev.parent),
-                                    netdev_name(dev), vaf);
+                                    netdev_name(dev), netdev_reg_state(dev),
+                                    vaf);
         } else if (dev) {
-                r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
+                r = printk("%s%s%s: %pV", level, netdev_name(dev),
+                           netdev_reg_state(dev), vaf);
         } else {
                 r = printk("%s(NULL net_device): %pV", level, vaf);
         }