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net: Allow for more then a single subclass for netif_addr_lock 

Currently netif_addr_lock_nested assumes that there can be only
a single nesting level between 2 devices.  However, if we
have multiple devices of the same type stacked, this fails.
For example:
 eth0 <-- vlan0.10 <-- vlan0.10.20

A more complicated configuration may stack more then one type of
device in different order.
Ex:
  eth0 <-- vlan0.10 <-- macvlan0 <-- vlan1.10.20 <-- macvlan1

This patch adds an ndo_* function that allows each stackable
device to report its nesting level.  If the device doesn't
provide this function default subclass of 1 is used.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2014-05-16 17:04:54 -04:00 committed by David S. Miller
parent 4085ebe8c3
commit 25175ba5c9
1 changed files with 7 additions and 1 deletions
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8
include/linux/netdevice.h
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@ -1144,6 +1144,7 @@ struct net_device_ops {
netdev_tx_t (*ndo_dfwd_start_xmit) (struct sk_buff *skb,
struct net_device *dev,
void *priv);
int (*ndo_get_lock_subclass)(struct net_device *dev);
};
/**
@ -2950,7 +2951,12 @@ static inline void netif_addr_lock(struct net_device *dev)
static inline void netif_addr_lock_nested(struct net_device *dev)
{
spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
int subclass = SINGLE_DEPTH_NESTING;
if (dev->netdev_ops->ndo_get_lock_subclass)
subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);
spin_lock_nested(&dev->addr_list_lock, subclass);
}
static inline void netif_addr_lock_bh(struct net_device *dev)