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[netdevice] Avoid registering duplicate network devices

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Reject network devices which appear to be duplicates of those already
available via a different underlying hardware device.  On a Xen PV-HVM
system, this allows us to filter out the emulated PCI NICs (which
would otherwise appear alongside the netfront NICs).

Note that we cannot use the Xen facility to "unplug" the emulated PCI
NICs, since there is no guarantee that the OS we subsequently load
will have a native netfront driver.

We permit devices with the same MAC address if they are attached to
the same underlying hardware device (e.g. VLAN devices).

Inspired-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-07-30 18:11:20 +01:00
parent 057eb9e496
commit 98d09a1e03
2 changed files with 42 additions and 5 deletions
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2
src/include/ipxe/netdevice.h
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@@ -685,6 +685,8 @@ extern struct net_device * find_netdev ( const char *name );
extern struct net_device * find_netdev_by_index ( unsigned int index );
extern struct net_device * find_netdev_by_location ( unsigned int bus_type,
unsigned int location );
extern struct net_device *
find_netdev_by_ll_addr ( struct ll_protocol *ll_protocol, const void *ll_addr );
extern struct net_device * last_opened_netdev ( void );
extern int net_tx ( struct io_buffer *iobuf, struct net_device *netdev,
struct net_protocol *net_protocol, const void *ll_dest,