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@@ -17,6 +17,7 @@
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*/
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#include <string.h>
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+#include <errno.h>
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#include <vsprintf.h>
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#include <gpxe/netdevice.h>
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#include <usr/ifmgmt.h>
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@@ -30,21 +31,93 @@
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void test_dhcp ( struct net_device *netdev );
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-void autoboot ( void ) {
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+/**
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+ * Identify the boot network device
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+ *
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+ * @ret netdev Boot network device
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+ */
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+static struct net_device * find_boot_netdev ( void ) {
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+ return NULL;
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+}
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+
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+/**
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+ * Get the next network device to try
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+ *
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+ * @ret netdev 'Next' network device
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+ *
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+ * This function will cycle through all registered network devices in
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+ * order, returning NULL.
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+ *
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+ * This function should be safe against registration/deregistration of
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+ * net devices between calls to next_netdev().
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+ */
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+static struct net_device * next_netdev ( void ) {
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+ static struct net_device *last_netdev = NULL;
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struct net_device *netdev;
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- int rc;
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for_each_netdev ( netdev ) {
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+ if ( ! last_netdev ) {
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+ last_netdev = netdev;
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+ return netdev;
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+ }
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+ if ( last_netdev == netdev )
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+ last_netdev = NULL;
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+ }
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- if ( ( rc = ifopen ( netdev ) ) != 0 )
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- continue;
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+ last_netdev = NULL;
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+ return NULL;
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+}
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+
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+/**
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+ * Boot from a network device
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+ *
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+ * @v netdev Network device
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+ */
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+void netboot ( struct net_device *netdev ) {
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+
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+ /* Open device and display device status */
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+ if ( ifopen ( netdev ) != 0 )
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+ return;
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+ ifstat ( netdev );
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- ifstat ( netdev );
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+ test_dhcp ( netdev );
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+}
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+
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+/**
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+ * Close all open net devices
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+ *
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+ * Called before a fresh boot attempt in order to free up memory. We
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+ * don't just close the device immediately after the boot fails,
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+ * because there may still be TCP connections in the process of
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+ * closing.
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+ */
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+static void close_all_netdevs ( void ) {
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+ struct net_device *netdev;
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- test_dhcp ( netdev );
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-
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+ for_each_netdev ( netdev ) {
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ifclose ( netdev );
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}
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+}
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+
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+/**
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+ * Boot the system
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+ */
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+void autoboot ( void ) {
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+ struct net_device *boot_netdev;
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+ struct net_device *netdev;
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+
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+ /* If we have an identifable boot device, try that first */
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+ close_all_netdevs();
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+ if ( ( boot_netdev = find_boot_netdev() ) )
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+ netboot ( boot_netdev );
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+
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+ /* If that fails, try booting from any of the other devices */
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+ for_each_netdev ( netdev ) {
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+ if ( netdev == boot_netdev )
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+ continue;
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+ close_all_netdevs();
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+ netboot ( netdev );
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+ }
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printf ( "No more network devices\n" );
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}
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