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Merge branch 'netdev_print'

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Veaceslav Falico says:

====================
net: print net_device name/state more often

Currently we use net_device->name only if it's the NETREG_REGISTERED
reg_state, otherwise we return "(unregistered device)".

However, we always populate net_device->name on creation, so it's always
available to us for use. The only caveat is that we might have a name like
"eth%d", in which case we cannot use it as it might change in the future.

Also, the net_device might not be NETREG_UNREGISTERED when the function is
called (_UNINITIALIZED, _UNREGISTERING, _RELEASED, _DUMMY), so it's
misleading.

So, a better way would be to always return the dev->name in netdev_name(),
unless it's in the form of "eth%d" or it's empty, then return
"unnamed net_device". This way we'll always return the name in
NETREG_REGISTERED reg_state, and also return it in other states, when
possible.

Also, to be more verbose on non-NETREG_REGISTERED states, add a function
netdev_reg_state(), which returns a string describing the state, and use it
in netdev_printk()-related functions. If the dev is in NETREG_REGISTERED
state then a void string is regurned and, thus, nothing changes.

After these two patches we'll have the same behaviour in the usual cases,
and more verbose in non-standardad/buggy ones.

v2->v3:
Correct the string for _UNINITIALIZED and warn on a bad reg_state,
per Joe Perches's comments.

v1->v2:
As Tom Gundersen suggested, there might be a case when we have an empty
string as a name for a device, so account this also and return "unnamed
device" for that case too.
====================

Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-07-20 20:39:16 -07:00
commit 4ec6837804
3 changed files with 29 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/linux/netdevice.h
View File

@ -3383,11 +3383,26 @@ extern struct pernet_operations __net_initdata loopback_net_ops;
static inline const char *netdev_name(const struct net_device *dev)
{
if (dev->reg_state != NETREG_REGISTERED)
return "(unregistered net_device)";
if (!dev->name[0] || strchr(dev->name, '%'))
return "(unnamed net_device)";
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 */

8
lib/dynamic_debug.c
View File

@ -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);
}

8
net/core/dev.c
View File

@ -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);
}