Make open() and close() an official part of the netdevice API.

Call netdevice's poll() and transmit() methods only when device is open.

src/drivers/net/legacy.c

@@ -56,6 +56,14 @@ static void legacy_poll ( struct net_device *netdev ) {
 	}
 }
 
+static int legacy_open ( struct net_device *netdev __unused ) {
+	return 0;
+}
+
+static void legacy_close ( struct net_device *netdev __unused ) {
+	/* Nothing to do */
+}
+
 int legacy_probe ( struct pci_device *pci,
 		   const struct pci_device_id *id __unused,
 		   int ( * probe ) ( struct nic *nic,
@@ -74,6 +82,8 @@ int legacy_probe ( struct pci_device *pci,
 	memset ( &nic, 0, sizeof ( nic ) );
 	pci_set_drvdata ( pci, netdev );
 
+	netdev->open = legacy_open;
+	netdev->close = legacy_close;
 	netdev->transmit = legacy_transmit;
 	netdev->poll = legacy_poll;
 	nic.node_addr = netdev->ll_addr;

src/drivers/net/pnic.c

@@ -185,6 +185,20 @@ static void pnic_irq ( struct net_device *netdev, irq_action_t action ) {
 }
 #endif
 
+/**************************************************************************
+OPEN - Open network device
+***************************************************************************/
+static int pnic_open ( struct net_device *netdev __unused ) {
+	return 0;
+}
+
+/**************************************************************************
+CLOSE - Close network device
+***************************************************************************/
+static void pnic_close ( struct net_device *netdev __unused ) {
+	/* Nothing to do */
+}
+
 /**************************************************************************
 DISABLE - Turn off ethernet interface
 ***************************************************************************/
@@ -238,6 +252,8 @@ static int pnic_probe ( struct pci_device *pci,
 				netdev->ll_addr, ETH_ALEN, NULL );
 
 	/* Point to NIC specific routines */
+	netdev->open	 = pnic_open;
+	netdev->close	 = pnic_close;
 	netdev->poll	 = pnic_poll;
 	netdev->transmit = pnic_transmit;
 

src/drivers/net/rtl8139.c

@@ -542,8 +542,8 @@ static int rtl_probe ( struct pci_device *pci,
 	nvs_read ( &rtl->eeprom.nvs, EE_MAC, netdev->ll_addr, ETH_ALEN );
 	
 	/* Point to NIC specific routines */
-	//	netdev->open	 = rtl_open;
-	//	netdev->close	 = rtl_close;
+	netdev->open	 = rtl_open;
+	netdev->close	 = rtl_close;
 	netdev->transmit = rtl_transmit;
 	netdev->poll	 = rtl_poll;
 
@@ -558,10 +558,6 @@ static int rtl_probe ( struct pci_device *pci,
 			goto err;
 	}
 
-#warning "Hack alert"
-	rtl_open ( netdev );
-
-
 	return 0;
 
  err:
@@ -584,10 +580,6 @@ static void rtl_remove ( struct pci_device *pci ) {
 	struct net_device *netdev = pci_get_drvdata ( pci );
 	struct rtl8139_nic *rtl = netdev->priv;
 
-
-#warning "Hack alert"	
-	rtl_close ( netdev );
-
 	if ( rtl->nvo.nvs )
 		nvo_unregister ( &rtl->nvo );
 	unregister_netdev ( netdev );

src/include/gpxe/netdevice.h

@@ -142,6 +142,23 @@ struct net_device {
 	/** List of persistent reference holders */
 	struct list_head references;
 
+	/** Open network device
+	 *
+	 * @v netdev	Network device
+	 * @ret rc	Return status code
+	 *
+	 * This method should allocate RX packet buffers and enable
+	 * the hardware to start transmitting and receiving packets.
+	 */
+	int ( * open ) ( struct net_device *netdev );
+	/** Close network device
+	 *
+	 * @v netdev	Network device
+	 *
+	 * This method should stop the flow of packets, and free up
+	 * any packets that are currently in the device's TX queue.
+	 */
+	void ( * close ) ( struct net_device *netdev );
 	/** Transmit packet
 	 *
 	 * @v netdev	Network device
@@ -154,6 +171,9 @@ struct net_device {
 	 * Ownership of the packet buffer is transferred to the @c
 	 * net_device, which must eventually call free_pkb() to
 	 * release the buffer.
+	 *
+	 * This method is guaranteed to be called only when the device
+	 * is open.
 	 */
 	int ( * transmit ) ( struct net_device *netdev, struct pk_buff *pkb );
 	/** Poll for received packet
@@ -163,6 +183,9 @@ struct net_device {
 	 * This method should cause the hardware to check for received
 	 * packets.  Any received packets should be delivered via
 	 * netdev_rx().
+	 *
+	 * This method is guaranteed to be called only when the device
+	 * is open.
 	 */
 	void ( * poll ) ( struct net_device *netdev );
 
@@ -174,6 +197,11 @@ struct net_device {
 	 */
 	uint8_t ll_addr[MAX_LL_ADDR_LEN];
 
+	/** Current device state
+	 *
+	 * This is the bitwise-OR of zero or more NETDEV_XXX constants.
+	 */
+	unsigned int state;
 	/** Received packet queue */
 	struct list_head rx_queue;
 
@@ -181,6 +209,9 @@ struct net_device {
 	void *priv;
 };
 
+/** Network device is open */
+#define NETDEV_OPEN 0x0001
+
 /** Declare a link-layer protocol */
 #define __ll_protocol  __table ( ll_protocols, 01 )
 
@@ -209,6 +240,8 @@ extern int netdev_poll ( struct net_device *netdev );
 extern struct pk_buff * netdev_rx_dequeue ( struct net_device *netdev );
 extern struct net_device * alloc_netdev ( size_t priv_size );
 extern int register_netdev ( struct net_device *netdev );
+extern int netdev_open ( struct net_device *netdev );
+extern void netdev_close ( struct net_device *netdev );
 extern void unregister_netdev ( struct net_device *netdev );
 extern void free_netdev ( struct net_device *netdev );
 extern struct net_device * next_netdev ( void );

src/net/netdevice.c

@@ -54,6 +54,12 @@ static LIST_HEAD ( net_devices );
 int netdev_tx ( struct net_device *netdev, struct pk_buff *pkb ) {
 	DBG ( "%s transmitting %p+%zx\n", netdev_name ( netdev ),
 	      pkb->data, pkb_len ( pkb ) );
+
+	if ( ! ( netdev->state & NETDEV_OPEN ) ) {
+		free_pkb ( pkb );
+		return -ENETUNREACH;
+	}
+	
 	return netdev->transmit ( netdev, pkb );
 }
 
@@ -100,7 +106,7 @@ int net_tx ( struct pk_buff *pkb, struct net_device *netdev,
  * @ret rc		Return status code
  */
 int net_rx ( struct pk_buff *pkb, struct net_device *netdev,
-	      uint16_t net_proto, const void *ll_source ) {
+	     uint16_t net_proto, const void *ll_source ) {
 	struct net_protocol *net_protocol;
 
 	/* Hand off to network-layer protocol, if any */
@@ -125,7 +131,10 @@ int net_rx ( struct pk_buff *pkb, struct net_device *netdev,
  * packets will be added to the RX packet queue via netdev_rx().
  */
 int netdev_poll ( struct net_device *netdev ) {
-	netdev->poll ( netdev );
+
+	if ( netdev->state & NETDEV_OPEN )
+		netdev->poll ( netdev );
+
 	return ( ! list_empty ( &netdev->rx_queue ) );
 }
 
@@ -186,15 +195,46 @@ int register_netdev ( struct net_device *netdev ) {
 }
 
 /**
- * Unregister network device
+ * Open network device
  *
  * @v netdev		Network device
- *
- * Removes the network device from the list of network devices.
+ * @ret rc		Return status code
  */
-void unregister_netdev ( struct net_device *netdev ) {
+int netdev_open ( struct net_device *netdev ) {
+	int rc;
+
+	/* Do nothing if device is already open */
+	if ( netdev->state & NETDEV_OPEN )
+		return 0;
+
+	DBG ( "%s opening\n", netdev_name ( netdev ) );
+
+	/* Open the device */
+	if ( ( rc = netdev->open ( netdev ) ) != 0 )
+		return rc;
+
+	/* Mark as opened */
+	netdev->state |= NETDEV_OPEN;
+	return 0;
+}
+
+/**
+ * Close network device
+ *
+ * @v netdev		Network device
+ */
+void netdev_close ( struct net_device *netdev ) {
 	struct pk_buff *pkb;
 
+	/* Do nothing if device is already closed */
+	if ( ! ( netdev->state & NETDEV_OPEN ) )
+		return;
+
+	DBG ( "%s closing\n", netdev_name ( netdev ) );
+
+	/* Close the device */
+	netdev->close ( netdev );
+
 	/* Discard any packets in the RX queue */
 	while ( ( pkb = netdev_rx_dequeue ( netdev ) ) ) {
 		DBG ( "%s discarding %p+%zx\n", netdev_name ( netdev ),
@@ -202,6 +242,22 @@ void unregister_netdev ( struct net_device *netdev ) {
 		free_pkb ( pkb );
 	}
 
+	/* Mark as closed */
+	netdev->state &= ~NETDEV_OPEN;
+}
+
+/**
+ * Unregister network device
+ *
+ * @v netdev		Network device
+ *
+ * Removes the network device from the list of network devices.
+ */
+void unregister_netdev ( struct net_device *netdev ) {
+
+	/* Ensure device is closed */
+	netdev_close ( netdev );
+
 	/* Kill off any persistent references to this device */
 	forget_references ( &netdev->references );
 

src/usr/autoboot.c

@@ -16,7 +16,9 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <string.h>
 #include <vsprintf.h>
+#include <gpxe/netdevice.h>
 #include <gpxe/autoboot.h>
 
 /** @file
@@ -30,11 +32,21 @@ void test_dhcp ( struct net_device *netdev );
 
 void autoboot ( void ) {
 	struct net_device *netdev;
+	int rc;
 
 	netdev = next_netdev ();
-	if ( netdev ) {
-		test_dhcp ( netdev );
-	} else {
+	if ( ! netdev ) {
 		printf ( "No network device found\n" );
+		return;
 	}
+
+	if ( ( rc = netdev_open ( netdev ) ) != 0 ) {
+		printf ( "Could not open %s: %s\n", netdev_name ( netdev ),
+			 strerror ( rc ) );
+		return;
+	}
+
+	test_dhcp ( netdev );
+
+	netdev_close ( netdev );
 }