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[Settings] Add per-netdevice settings block

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Add a configuration settings block for each net device.  This will
provide the parent scope for settings applicable only to that network
device (e.g. non-volatile options stored on the NIC, options obtained via
DHCP, etc.).

Expose the MAC address as a setting.
This commit is contained in:
Michael Brown
2008-03-20 21:06:03 +00:00
parent 260b93bb72
commit acfa14423e
6 changed files with 126 additions and 1 deletions
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95
src/net/netdev_settings.c Normal file
View File

@@ -0,0 +1,95 @@
/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include <errno.h>
#include <gpxe/dhcp.h>
#include <gpxe/settings.h>
#include <gpxe/netdevice.h>
/** @file
*
* Network device configuration settings
*
*/
/**
* Store value of network device setting
*
* @v settings Settings block
* @v tag Setting tag number
* @v data Setting data, or NULL to clear setting
* @v len Length of setting data
* @ret rc Return status code
*/
static int netdev_store ( struct settings *settings, unsigned int tag,
const void *data, size_t len ) {
struct net_device *netdev =
container_of ( settings, struct net_device, settings );
switch ( tag ) {
case DHCP_EB_MAC:
if ( len != netdev->ll_protocol->ll_addr_len )
return -EINVAL;
memcpy ( netdev->ll_addr, data, len );
return 0;
default :
return simple_settings_store ( settings, tag, data, len );
}
}
/**
* Fetch value of network device setting
*
* @v settings Settings block
* @v tag Setting tag number
* @v data Setting data, or NULL to clear setting
* @v len Length of setting data
* @ret rc Return status code
*/
static int netdev_fetch ( struct settings *settings, unsigned int tag,
void *data, size_t len ) {
struct net_device *netdev =
container_of ( settings, struct net_device, settings );
switch ( tag ) {
case DHCP_EB_MAC:
if ( len > netdev->ll_protocol->ll_addr_len )
len = netdev->ll_protocol->ll_addr_len;
memcpy ( data, netdev->ll_addr, len );
return netdev->ll_protocol->ll_addr_len;
default :
return simple_settings_fetch ( settings, tag, data, len );
}
}
/** Network device configuration settings operations */
struct settings_operations netdev_settings_operations = {
.store = netdev_store,
.fetch = netdev_fetch,
};
/** Network device named settings */
struct named_setting netdev_named_settings[] __named_setting = {
{
.name = "mac",
.description = "MAC address",
.tag = DHCP_EB_MAC,
.type = &setting_type_hex,
},
};

14
src/net/netdevice.c
View File

@@ -266,6 +266,9 @@ struct net_device * alloc_netdev ( size_t priv_size ) {
netdev->refcnt.free = free_netdev;
INIT_LIST_HEAD ( &netdev->tx_queue );
INIT_LIST_HEAD ( &netdev->rx_queue );
settings_init ( &netdev->settings,
&netdev_settings_operations, &netdev->refcnt,
netdev->name );
netdev->priv = ( ( ( void * ) netdev ) + sizeof ( *netdev ) );
}
return netdev;
@@ -282,11 +285,19 @@ struct net_device * alloc_netdev ( size_t priv_size ) {
*/
int register_netdev ( struct net_device *netdev ) {
static unsigned int ifindex = 0;
int rc;
/* Create device name */
snprintf ( netdev->name, sizeof ( netdev->name ), "net%d",
ifindex++ );
/* Register per-netdev configuration settings */
if ( ( rc = register_settings ( &netdev->settings, NULL ) ) != 0 ) {
DBGC ( netdev, "NETDEV %p could not register settings: %s\n",
netdev, strerror ( rc ) );
return rc;
}
/* Add to device list */
netdev_get ( netdev );
list_add_tail ( &netdev->list, &net_devices );
@@ -357,6 +368,9 @@ void unregister_netdev ( struct net_device *netdev ) {
/* Ensure device is closed */
netdev_close ( netdev );
/* Unregister per-netdev configuration settings */
unregister_settings ( &netdev->settings );
/* Remove from device list */
list_del ( &netdev->list );
netdev_put ( netdev );