[NETDEV] Add notion of link state

Add ability for network devices to flag link up/down state to the
networking core.

Autobooting code will now wait for link-up before attempting DHCP.

IPoIB reflects the Infiniband link state as the network device link state
(which is not strictly correct; we also need a succesful IPoIB IPv4
broadcast group join), but is probably more informative.

2 files changed, 35 insertions, 0 deletions

diff --git a/src/include/gpxe/errfile.h b/src/include/gpxe/errfile.h
index ae8b14809..011ff1f13 100644
--- a/src/include/gpxe/errfile.h
+++ b/src/include/gpxe/errfile.h
@@ -151,6 +151,7 @@
 #define ERRFILE_uri_test	      ( ERRFILE_OTHER | 0x000b0000 )
 #define ERRFILE_ibft		      ( ERRFILE_OTHER | 0x000c0000 )
 #define ERRFILE_tls		      ( ERRFILE_OTHER | 0x000d0000 )
+#define ERRFILE_ifmgmt		      ( ERRFILE_OTHER | 0x000e0000 )
 
 /** @} */
 
diff --git a/src/include/gpxe/netdevice.h b/src/include/gpxe/netdevice.h
index d8cb84d08..1ef648e11 100644
--- a/src/include/gpxe/netdevice.h
+++ b/src/include/gpxe/netdevice.h
@@ -254,6 +254,9 @@ struct net_device {
 /** Network device is open */
 #define NETDEV_OPEN 0x0001
 
+/** Network device has link */
+#define NETDEV_LINK_UP 0x0002
+
 /** Declare a link-layer protocol */
 #define __ll_protocol  __table ( struct ll_protocol, ll_protocols, 01 )
 
@@ -352,6 +355,37 @@ netdev_settings ( struct net_device *netdev ) {
 	return &netdev->settings.settings;
 }
 
+/**
+ * Mark network device as having link up
+ *
+ * @v netdev		Network device
+ */
+static inline __attribute__ (( always_inline )) void
+netdev_link_up ( struct net_device *netdev ) {
+	netdev->state |= NETDEV_LINK_UP;
+}
+
+/**
+ * Mark network device as having link down
+ *
+ * @v netdev		Network device
+ */
+static inline __attribute__ (( always_inline )) void
+netdev_link_down ( struct net_device *netdev ) {
+	netdev->state &= ~NETDEV_LINK_UP;
+}
+
+/**
+ * Check link state of network device
+ *
+ * @v netdev		Network device
+ * @ret link_up		Link is up
+ */
+static inline __attribute__ (( always_inline )) int
+netdev_link_ok ( struct net_device *netdev ) {
+	return ( netdev->state & NETDEV_LINK_UP );
+}
+
 extern int netdev_tx ( struct net_device *netdev, struct io_buffer *iobuf );
 extern void netdev_tx_complete_err ( struct net_device *netdev,
 				 struct io_buffer *iobuf, int rc );