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Try booting from the "boot" network device first (i.e. the one which we

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were loaded from).  The code to identify this device isn't present yet,
but the code to act upon the knowledge is.
This commit is contained in:
Michael Brown 2007-01-10 20:21:42 +00:00
parent 1fa5cd0e2b
commit 78ded6604a
1 changed files with 80 additions and 7 deletions
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87
src/usr/autoboot.c
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@ -17,6 +17,7 @@
*/
#include <string.h>
#include <errno.h>
#include <vsprintf.h>
#include <gpxe/netdevice.h>
#include <usr/ifmgmt.h>
@ -30,21 +31,93 @@
void test_dhcp ( struct net_device *netdev );
void autoboot ( void ) {
/**
* Identify the boot network device
*
* @ret netdev Boot network device
*/
static struct net_device * find_boot_netdev ( void ) {
return NULL;
}
/**
* Get the next network device to try
*
* @ret netdev 'Next' network device
*
* This function will cycle through all registered network devices in
* order, returning NULL.
*
* This function should be safe against registration/deregistration of
* net devices between calls to next_netdev().
*/
static struct net_device * next_netdev ( void ) {
static struct net_device *last_netdev = NULL;
struct net_device *netdev;
int rc;
for_each_netdev ( netdev ) {
if ( ! last_netdev ) {
last_netdev = netdev;
return netdev;
}
if ( last_netdev == netdev )
last_netdev = NULL;
}
if ( ( rc = ifopen ( netdev ) ) != 0 )
continue;
last_netdev = NULL;
return NULL;
}
ifstat ( netdev );
/**
* Boot from a network device
*
* @v netdev Network device
*/
void netboot ( struct net_device *netdev ) {
test_dhcp ( netdev );
/* Open device and display device status */
if ( ifopen ( netdev ) != 0 )
return;
ifstat ( netdev );
test_dhcp ( netdev );
}
/**
* Close all open net devices
*
* Called before a fresh boot attempt in order to free up memory. We
* don't just close the device immediately after the boot fails,
* because there may still be TCP connections in the process of
* closing.
*/
static void close_all_netdevs ( void ) {
struct net_device *netdev;
for_each_netdev ( netdev ) {
ifclose ( netdev );
}
}
/**
* Boot the system
*/
void autoboot ( void ) {
struct net_device *boot_netdev;
struct net_device *netdev;
/* If we have an identifable boot device, try that first */
close_all_netdevs();
if ( ( boot_netdev = find_boot_netdev() ) )
netboot ( boot_netdev );
/* If that fails, try booting from any of the other devices */
for_each_netdev ( netdev ) {
if ( netdev == boot_netdev )
continue;
close_all_netdevs();
netboot ( netdev );
}
printf ( "No more network devices\n" );
}