Commit 719a402c authored by Tariq Toukan's avatar Tariq Toukan Committed by Jakub Kicinski
Browse files

net: netdevice: Add operation ndo_sk_get_lower_dev 



ndo_sk_get_lower_dev returns the lower netdev that corresponds to
a given socket.
Additionally, we implement a helper netdev_sk_get_lowest_dev() to get
the lowest one in chain.

Signed-off-by: default avatarTariq Toukan <tariqt@nvidia.com>
Reviewed-by: default avatarBoris Pismenny <borisp@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 41fb4c1b

include/linux/netdevice.h

+4 −0
Original line number Diff line number Diff line
@@ -1398,6 +1398,8 @@ struct net_device_ops { 
	struct net_device*	(*ndo_get_xmit_slave)(struct net_device *dev,

						      struct sk_buff *skb,

						      bool all_slaves);

	struct net_device*	(*ndo_sk_get_lower_dev)(struct net_device *dev,

							struct sock *sk);

	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,

						    netdev_features_t features);

	int			(*ndo_set_features)(struct net_device *dev,
@@ -2858,6 +2860,8 @@ int init_dummy_netdev(struct net_device *dev); 
struct net_device *netdev_get_xmit_slave(struct net_device *dev,

					 struct sk_buff *skb,

					 bool all_slaves);

struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,

					    struct sock *sk);

struct net_device *dev_get_by_index(struct net *net, int ifindex);

struct net_device *__dev_get_by_index(struct net *net, int ifindex);

struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);

net/core/dev.c

+33 −0
Original line number Diff line number Diff line
@@ -8105,6 +8105,39 @@ struct net_device *netdev_get_xmit_slave(struct net_device *dev, 
}

EXPORT_SYMBOL(netdev_get_xmit_slave);



static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev,

						  struct sock *sk)

{

	const struct net_device_ops *ops = dev->netdev_ops;



	if (!ops->ndo_sk_get_lower_dev)

		return NULL;

	return ops->ndo_sk_get_lower_dev(dev, sk);

}



/**

 * netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket

 * @dev: device

 * @sk: the socket

 *

 * %NULL is returned if no lower device is found.

 */



struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,

					    struct sock *sk)

{

	struct net_device *lower;



	lower = netdev_sk_get_lower_dev(dev, sk);

	while (lower) {

		dev = lower;

		lower = netdev_sk_get_lower_dev(dev, sk);

	}



	return dev;

}

EXPORT_SYMBOL(netdev_sk_get_lowest_dev);



static void netdev_adjacent_add_links(struct net_device *dev)

{

	struct netdev_adjacent *iter;