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[netdevice] Provide function to retrieve the most recently opened net device

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There are currently four places within the codebase that use a
heuristic to guess the "boot network device", with varying degrees of
success.  Add a feature to the net device core to maintain a list of
open network devices, in order of opening, and provide a function
last_opened_netdev() to retrieve the most recently opened net device.
This should do a better job than the current assortment of
guess_boot_netdev() functions.
This commit is contained in:
Michael Brown 2008-11-21 20:31:12 +00:00
parent 8e8a348fd4
commit 02a0215873
2 changed files with 29 additions and 0 deletions
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3
src/include/gpxe/netdevice.h
View File

@ -229,6 +229,8 @@ struct net_device {
struct refcnt refcnt;
/** List of network devices */
struct list_head list;
/** List of open network devices */
struct list_head open_list;
/** Name of this network device */
char name[8];
/** Underlying hardware device */
@ -424,6 +426,7 @@ extern void netdev_irq ( struct net_device *netdev, int enable );
extern struct net_device * find_netdev ( const char *name );
extern struct net_device * find_netdev_by_location ( unsigned int bus_type,
unsigned int location );
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 );
extern int net_rx ( struct io_buffer *iobuf, struct net_device *netdev,

26
src/net/netdevice.c
View File

@ -45,6 +45,9 @@ static struct net_protocol net_protocols_end[0]
/** List of network devices */
struct list_head net_devices = LIST_HEAD_INIT ( net_devices );
/** List of open network devices, in reverse order of opening */
struct list_head open_net_devices = LIST_HEAD_INIT ( open_net_devices );
/**
* Record network device statistic
*
@ -368,6 +371,10 @@ int netdev_open ( struct net_device *netdev ) {
/* Mark as opened */
netdev->state |= NETDEV_OPEN;
/* Add to head of open devices list */
list_add ( &netdev->open_list, &open_net_devices );
return 0;
}
@ -393,6 +400,9 @@ void netdev_close ( struct net_device *netdev ) {
/* Mark as closed */
netdev->state &= ~NETDEV_OPEN;
/* Remove from open devices list */
list_del ( &netdev->open_list );
}
/**
@ -462,6 +472,22 @@ struct net_device * find_netdev_by_location ( unsigned int bus_type,
return NULL;
}
/**
* Get most recently opened network device
*
* @ret netdev Most recently opened network device, or NULL
*/
struct net_device * last_opened_netdev ( void ) {
struct net_device *netdev;
list_for_each_entry ( netdev, &open_net_devices, open_list ) {
assert ( netdev->state & NETDEV_OPEN );
return netdev;
}
return NULL;
}
/**
* Transmit network-layer packet
*