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net: add netdev_adjacent->private and allow to use it

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Currently, even though we can access any linked device, we can't attach
anything to it, which is vital to properly manage them.

To fix this, add a new void *private to netdev_adjacent and functions
setting/getting it (per link), so that we can save, per example, bonding's
slave structures there, per slave device.

netdev_master_upper_dev_link_private(dev, upper_dev, private) links dev to
upper dev and populates the neighbour link only with private.

netdev_lower_dev_get_private{,_rcu}() returns the private, if found.

CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Veaceslav Falico
2013-09-25 09:20:09 +02:00
committed by David S. Miller
parent 5249dec738
commit 402dae9614
2 changed files with 64 additions and 11 deletions
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include/linux/netdevice.h
+7
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@@ -2839,8 +2839,15 @@ extern int netdev_upper_dev_link(struct net_device *dev,
struct net_device *upper_dev);
extern int netdev_master_upper_dev_link(struct net_device *dev,
struct net_device *upper_dev);
extern int netdev_master_upper_dev_link_private(struct net_device *dev,
struct net_device *upper_dev,
void *private);
extern void netdev_upper_dev_unlink(struct net_device *dev,
struct net_device *upper_dev);
extern void *netdev_lower_dev_get_private_rcu(struct net_device *dev,
struct net_device *lower_dev);
extern void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev);
extern int skb_checksum_help(struct sk_buff *skb);
extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);