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[netdevice] Add the concept of a network upper-layer driver

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Add the concept of a network upper-layer driver, which can create
arbitrary devices on top of network devices.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-09-05 00:55:23 +01:00
parent 97ef28aea0
commit ca4df90a63
2 changed files with 115 additions and 36 deletions
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91
src/net/netdevice.c
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@@ -56,6 +56,39 @@ struct errortab netdev_errors[] __errortab = {
__einfo_errortab ( EINFO_EUNKNOWN_LINK_STATUS ),
};
/**
* Notify drivers of network device or link state change
*
* @v netdev Network device
*/
static void netdev_notify ( struct net_device *netdev ) {
struct net_driver *driver;
for_each_table_entry ( driver, NET_DRIVERS )
driver->notify ( netdev );
}
/**
* Mark network device as having a specific link state
*
* @v netdev Network device
* @v rc Link status code
*/
void netdev_link_err ( struct net_device *netdev, int rc ) {
/* Record link state */
netdev->link_rc = rc;
if ( netdev->link_rc == 0 ) {
DBGC ( netdev, "NETDEV %p link is up\n", netdev );
} else {
DBGC ( netdev, "NETDEV %p link is down: %s\n",
netdev, strerror ( netdev->link_rc ) );
}
/* Notify drivers of link state change */
netdev_notify ( netdev );
}
/**
* Mark network device as having link down
*
@@ -68,7 +101,7 @@ void netdev_link_down ( struct net_device *netdev ) {
*/
if ( ( netdev->link_rc == 0 ) ||
( netdev->link_rc == -EUNKNOWN_LINK_STATUS ) ) {
netdev->link_rc = -ENOTCONN;
netdev_link_err ( netdev, -ENOTCONN );
}
}
@@ -367,6 +400,7 @@ struct net_device * alloc_netdev ( size_t priv_size ) {
*/
int register_netdev ( struct net_device *netdev ) {
static unsigned int ifindex = 0;
struct net_driver *driver;
int rc;
/* Create device name */
@@ -376,14 +410,6 @@ int register_netdev ( struct net_device *netdev ) {
/* Set initial link-layer address */
netdev->ll_protocol->init_addr ( netdev->hw_addr, netdev->ll_addr );
/* Register per-netdev configuration settings */
if ( ( rc = register_settings ( netdev_settings ( netdev ),
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 );
@@ -391,7 +417,31 @@ int register_netdev ( struct net_device *netdev ) {
netdev, netdev->name, netdev->dev->name,
netdev_addr ( netdev ) );
/* Register per-netdev configuration settings */
if ( ( rc = register_settings ( netdev_settings ( netdev ),
NULL ) ) != 0 ) {
DBGC ( netdev, "NETDEV %p could not register settings: %s\n",
netdev, strerror ( rc ) );
goto err_register_settings;
}
/* Probe device */
for_each_table_entry ( driver, NET_DRIVERS ) {
if ( ( rc = driver->probe ( netdev ) ) != 0 ) {
DBGC ( netdev, "NETDEV %p could not add %s device: "
"%s\n", netdev, driver->name, strerror ( rc ) );
goto err_probe;
}
}
return 0;
err_probe:
for_each_table_entry_continue_reverse ( driver, NET_DRIVERS )
driver->remove ( netdev );
unregister_settings ( netdev_settings ( netdev ) );
err_register_settings:
return rc;
}
/**
@@ -419,6 +469,9 @@ int netdev_open ( struct net_device *netdev ) {
/* Add to head of open devices list */
list_add ( &netdev->open_list, &open_net_devices );
/* Notify drivers of device state change */
netdev_notify ( netdev );
return 0;
}
@@ -435,18 +488,21 @@ void netdev_close ( struct net_device *netdev ) {
DBGC ( netdev, "NETDEV %p closing\n", netdev );
/* Remove from open devices list */
list_del ( &netdev->open_list );
/* Mark as closed */
netdev->state &= ~NETDEV_OPEN;
/* Notify drivers of device state change */
netdev_notify ( netdev );
/* Close the device */
netdev->op->close ( netdev );
/* Flush TX and RX queues */
netdev_tx_flush ( netdev );
netdev_rx_flush ( netdev );
/* Mark as closed */
netdev->state &= ~NETDEV_OPEN;
/* Remove from open devices list */
list_del ( &netdev->open_list );
}
/**
@@ -457,10 +513,15 @@ void netdev_close ( struct net_device *netdev ) {
* Removes the network device from the list of network devices.
*/
void unregister_netdev ( struct net_device *netdev ) {
struct net_driver *driver;
/* Ensure device is closed */
netdev_close ( netdev );
/* Remove device */
for_each_table_entry_reverse ( driver, NET_DRIVERS )
driver->remove ( netdev );
/* Unregister per-netdev configuration settings */
unregister_settings ( netdev_settings ( netdev ) );