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[netdevice] Add mechanism for reporting detailed link status codes

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Expand the NETDEV_LINK_UP bit into a link_rc status code field,
allowing specific reasons for link failure to be reported via
"ifstat".

Originally-authored-by: Joshua Oreman <oremanj@rwcr.net>
This commit is contained in:
Michael Brown
2009-06-24 12:52:38 +01:00
parent cb9700ef6f
commit a310d00d37
4 changed files with 48 additions and 8 deletions
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30
src/net/netdevice.c
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@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <gpxe/process.h>
#include <gpxe/init.h>
#include <gpxe/device.h>
#include <gpxe/errortab.h>
#include <gpxe/netdevice.h>
/** @file
@@ -44,6 +45,34 @@ 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 );
/** Default link status code */
#define EUNKNOWN_LINK_STATUS EINPROGRESS
/** Human-readable message for the default link status */
struct errortab netdev_errors[] __errortab = {
{ EUNKNOWN_LINK_STATUS, "Unknown" },
};
/**
* Mark network device as having link down
*
* @v netdev Network device
*/
void netdev_link_down ( struct net_device *netdev ) {
switch ( netdev->link_rc ) {
case 0:
case -EUNKNOWN_LINK_STATUS:
netdev->link_rc = -ENOTCONN;
break;
default:
/* Avoid clobbering a more detailed link status code,
* if one is already set.
*/
break;
}
}
/**
* Record network device statistic
*
@@ -302,6 +331,7 @@ struct net_device * alloc_netdev ( size_t priv_size ) {
netdev = zalloc ( total_len );
if ( netdev ) {
netdev->refcnt.free = free_netdev;
netdev->link_rc = -EUNKNOWN_LINK_STATUS;
INIT_LIST_HEAD ( &netdev->tx_queue );
INIT_LIST_HEAD ( &netdev->rx_queue );
netdev_settings_init ( netdev );