Commit 5e404cd6 authored Apr 02, 2013 by Paul Gortmaker Committed by David S. Miller Apr 02, 2013

ipconfig: add informative timeout messages while waiting for carrier



Commit 3fb72f1e ("ipconfig wait
for carrier") added a "wait for carrier on at least one interface"
policy, with a worst case maximum wait of two minutes.

However, if you encounter this, you won't get any feedback from
the console as to the nature of what is going on.  You just see
the booting process hang for two minutes and then continue.

Here we add a message so the user knows what is going on, and
hence can take action to rectify the situation (e.g. fix network
cable or whatever.)  After the 1st 10s pause, output now begins
that looks like this:

	Waiting up to 110 more seconds for network.
	Waiting up to 100 more seconds for network.
	Waiting up to 90 more seconds for network.
	Waiting up to 80 more seconds for network.
	...

Since most systems will have no problem getting link/carrier in the
1st 10s, the only people who will see these messages are people with
genuine issues that need to be resolved.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f7f22874

net/ipv4/ipconfig.c

+12 −1

Original line number	Diff line number	Diff line
		@@ -206,7 +206,7 @@ static int __init ic_open_devs(void)
		struct ic_device d, *last;
		struct net_device *dev;
		unsigned short oflags;
		unsigned long start;
		unsigned long start, next_msg;

		last = &ic_first_dev;
		rtnl_lock();
		@@ -263,12 +263,23 @@ static int __init ic_open_devs(void)

		/* wait for a carrier on at least one device */
		start = jiffies;
		next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
		while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
		int wait, elapsed;

		for_each_netdev(&init_net, dev)
		if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
		goto have_carrier;

		msleep(1);

		if time_before(jiffies, next_msg)
		continue;

		elapsed = jiffies_to_msecs(jiffies - start);
		wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
		pr_info("Waiting up to %d more seconds for network.\n", wait);
		next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
		}
		have_carrier:
		rtnl_unlock();

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