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Date: Sun, 6 Jul 2008 16:56:55 -0700
From: Arjan van de Ven <arjan@...radead.org>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: Re: Printing the driver name as part of the netdev watchdog message
On Sun, 06 Jul 2008 15:53:18 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:
> From: Arjan van de Ven <arjan@...radead.org>
> Date: Sun, 6 Jul 2008 13:08:01 -0700
>
> > Does this patch look like the right approach for achieving the goal?
>
> It's almost there.
>
> You can issue an ethtool_ops->get_drvinfo() call, on devices which
> support ethtool, and fetch the driver info from there.
>
> Your current method of obtaining this info can be used as the
> fallback when the ethtool op fails.
fair enough...
how about this then?
(still leaves the logistics question between when WARN() hits the tree and when this patch go)
From: Arjan van de Ven <arjan@...ux.intel.com>
Subject: Use WARN_ONCE() in the netdev timeout handler (and print module name)
As suggested by Dave:
This patch adds a function to get the driver name from a struct net_device,
and consequently uses this in the watchdog timeout handler to print as
part of the message. To make this useful, use WARN_ONCE() so that the
message is part of the ===[ cut here ]=== section, meaning that people
are more likely to report it, and automated warning collection will pick it up.
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
include/linux/netdevice.h | 3 +++
net/core/dev.c | 34 +++++++++++++++++++++++++++++++---
net/sched/sch_generic.c | 9 +++++----
3 files changed, 39 insertions(+), 7 deletions(-)
Index: linux.trees.git/include/linux/netdevice.h
===================================================================
--- linux.trees.git.orig/include/linux/netdevice.h
+++ linux.trees.git/include/linux/netdevice.h
@@ -1514,6 +1514,9 @@ extern void dev_seq_stop(struct seq_file
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);
+extern void netdev_drivername(struct net_device *dev, char *buffer, int len);
+
+
extern void linkwatch_run_queue(void);
extern int netdev_compute_features(unsigned long all, unsigned long one);
Index: linux.trees.git/net/core/dev.c
===================================================================
--- linux.trees.git.orig/net/core/dev.c
+++ linux.trees.git/net/core/dev.c
@@ -3706,10 +3706,8 @@ static void rollback_registered(struct n
/* Some devices call without registering for initialization unwind. */
if (dev->reg_state == NETREG_UNINITIALIZED) {
- printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
+ WARN(1, KERN_DEBUG "unregister_netdevice: device %s/%p never "
"was registered\n", dev->name, dev);
-
- WARN_ON(1);
return;
}
@@ -4554,6 +4552,36 @@ err_name:
return -ENOMEM;
}
+void netdev_drivername(struct net_device *dev, char *buffer, int len)
+{
+ struct device_driver *driver;
+ struct device *parent;
+ struct ethtool_drvinfo info;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+
+ if (len <= 0)
+ return;
+ buffer[0] = 0;
+
+ if (ops->get_drvinfo) {
+ memset(&info, 0, sizeof(info));
+ info.cmd = ETHTOOL_GDRVINFO;
+ ops->get_drvinfo(dev, &info);
+ strlcpy(buffer, info.driver, len);
+ if (strlen(info.driver) > 0)
+ return;
+ }
+
+ parent = dev->dev.parent;
+
+ if (!parent)
+ return;
+
+ driver = parent->driver;
+ if (driver && driver->name)
+ strlcpy(buffer, driver->name, len);
+}
+
static void __net_exit netdev_exit(struct net *net)
{
kfree(net->dev_name_head);
Index: linux.trees.git/net/sched/sch_generic.c
===================================================================
--- linux.trees.git.orig/net/sched/sch_generic.c
+++ linux.trees.git/net/sched/sch_generic.c
@@ -215,11 +215,12 @@ static void dev_watchdog(unsigned long a
netif_carrier_ok(dev)) {
if (netif_queue_stopped(dev) &&
time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {
-
- printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
- dev->name);
+ char drivername[64];
+ netdev_drivername(dev, drivername, 64);
+ WARN_ONCE(1, KERN_INFO
+ "NETDEV WATCHDOG: %s (%s): transmit timed out\n",
+ dev->name, drivername);
dev->tx_timeout(dev);
- WARN_ON_ONCE(1);
}
if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo)))
dev_hold(dev);
--
If you want to reach me at my work email, use arjan@...ux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
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