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net: l3mdev: Add master device lookup by index

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Add helper to lookup l3mdev master index given a device index.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-12-16 13:20:43 -08:00 committed by David S. Miller
parent cc9da6cc4f
commit 1a8524794f
1 changed files with 23 additions and 0 deletions
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23
include/net/l3mdev.h
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@ -51,6 +51,24 @@ static inline int l3mdev_master_ifindex(struct net_device *dev)
return ifindex;
}
static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
{
struct net_device *dev;
int rc = 0;
if (likely(ifindex)) {
rcu_read_lock();
dev = dev_get_by_index_rcu(net, ifindex);
if (dev)
rc = l3mdev_master_ifindex_rcu(dev);
rcu_read_unlock();
}
return rc;
}
/* get index of an interface to use for FIB lookups. For devices
* enslaved to an L3 master device FIB lookups are based on the
* master index
@ -167,6 +185,11 @@ static inline int l3mdev_master_ifindex(struct net_device *dev)
return 0;
}
static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
{
return 0;
}
static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
{
return dev ? dev->ifindex : 0;