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Commit 48311f46 authored by Veaceslav Falico's avatar Veaceslav Falico Committed by David S. Miller
Browse files

net: add netdev_upper_get_next_dev_rcu(dev, iter) 



This function returns the next dev in the dev->upper_dev_list after the
struct list_head **iter position, and updates *iter accordingly. Returns
NULL if there are no devices left.

Caller must hold RCU read lock.

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>
CC: Cong Wang <amwang@redhat.com>
Signed-off-by: default avatarVeaceslav Falico <vfalico@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 620f3186

net/core/dev.c

+25 −0
Original line number Original line Diff line number Diff line
@@ -4468,6 +4468,31 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev) 
}

}

EXPORT_SYMBOL(netdev_master_upper_dev_get);

EXPORT_SYMBOL(netdev_master_upper_dev_get);





/* netdev_upper_get_next_dev_rcu - Get the next dev from upper list

 * @dev: device

 * @iter: list_head ** of the current position

 *

 * Gets the next device from the dev's upper list, starting from iter

 * position. The caller must hold RCU read lock.

 */

struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,

						 struct list_head **iter)

{

	struct netdev_adjacent *upper;



	WARN_ON_ONCE(!rcu_read_lock_held());



	upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);



	if (&upper->list == &dev->upper_dev_list)

		return NULL;



	*iter = &upper->list;



	return upper->dev;

}

EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);



/**

/**

 * netdev_master_upper_dev_get_rcu - Get master upper device

 * netdev_master_upper_dev_get_rcu - Get master upper device

 * @dev: device

 * @dev: device