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bonding: create bond_first_slave_rcu()

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The bond_first_slave_rcu() will be used to instead of bond_first_slave()
in rcu_read_lock().

According to the Jay Vosburgh's suggestion, the struct netdev_adjacent
should hide from users who wanted to use it directly. so I package a
new function to get the first slave of the bond.

Suggested-by: Nikolay Aleksandrov <nikolay@redhat.com>
Suggested-by: Jay Vosburgh <fubar@us.ibm.com>
Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
dingtianhong 2013-12-13 10:19:55 +08:00 committed by David S. Miller
parent 2e52f4fe36
commit e001bfad91
3 changed files with 26 additions and 0 deletions
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4
drivers/net/bonding/bonding.h
View File

@ -101,6 +101,10 @@
netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
NULL)
/* Caller must have rcu_read_lock */
#define bond_first_slave_rcu(bond) \
netdev_lower_get_first_private_rcu(bond->dev)
#define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
#define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))

1
include/linux/netdevice.h
View File

@ -2907,6 +2907,7 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
void *netdev_adjacent_get_private(struct list_head *adj_list);
void *netdev_lower_get_first_private_rcu(struct net_device *dev);
struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);

21
net/core/dev.c
View File

@ -4543,6 +4543,27 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
}
EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
/**
* netdev_lower_get_first_private_rcu - Get the first ->private from the
* lower neighbour list, RCU
* variant
* @dev: device
*
* Gets the first netdev_adjacent->private from the dev's lower neighbour
* list. The caller must hold RCU read lock.
*/
void *netdev_lower_get_first_private_rcu(struct net_device *dev)
{
struct netdev_adjacent *lower;
lower = list_first_or_null_rcu(&dev->adj_list.lower,
struct netdev_adjacent, list);
if (lower)
return lower->private;
return NULL;
}
EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
/**
* netdev_master_upper_dev_get_rcu - Get master upper device
* @dev: device