Commit 88ad4175 authored Nov 16, 2015 by Bjørn Mork Committed by David S. Miller Nov 16, 2015

net/core: use netdev name in warning if no parent



A recent flaw in the netdev feature setting resulted in warnings
like this one from VLAN interfaces:

 WARNING: CPU: 1 PID: 4975 at net/core/dev.c:2419 skb_warn_bad_offload+0xbc/0xcb()
 : caps=(0x00000000001b5820, 0x00000000001b5829) len=2782 data_len=0 gso_size=1348 gso_type=16 ip_summed=3

The ":" is supposed to be preceded by a driver name, but in this
case it is an empty string since the device has no parent.

There are many types of network devices without a parent. The
anonymous warnings for these devices can be hard to debug.  Log
the network device name instead in these cases to assist further
debugging.

This is mostly similar to how __netdev_printk() handles orphan
devices.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 8844f972

net/core/dev.c

+8 −5

Original line number	Diff line number	Diff line
		@@ -2403,17 +2403,20 @@ static void skb_warn_bad_offload(const struct sk_buff *skb)
		{
		static const netdev_features_t null_features = 0;
		struct net_device *dev = skb->dev;
		const char *driver = "";
		const char *name = "";

		if (!net_ratelimit())
		return;

		if (dev && dev->dev.parent)
		driver = dev_driver_string(dev->dev.parent);

		if (dev) {
		if (dev->dev.parent)
		name = dev_driver_string(dev->dev.parent);
		else
		name = netdev_name(dev);
		}
		WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
		"gso_type=%d ip_summed=%d\n",
		driver, dev ? &dev->features : &null_features,
		name, dev ? &dev->features : &null_features,
		skb->sk ? &skb->sk->sk_route_caps : &null_features,
		skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
		skb_shinfo(skb)->gso_type, skb->ip_summed);