Network API now allows for multiple network devices (although the

implementation allows for only one, and does so without compromising on
the efficiency of static allocation).

Link-layer protocols are cleanly separated from the device drivers.

Network-layer protocols are cleanly separated from individual network
devices.

Link-layer and network-layer protocols are cleanly separated from each
other.

src/include/gpxe/ethernet.h

@@ -0,0 +1,28 @@
+#ifndef _GPXE_ETHERNET_H
+#define _GPXE_ETHERNET_H
+
+/** @file
+ *
+ * Ethernet protocol
+ *
+ */
+
+#include <stdint.h>
+#include <gpxe/netdevice.h>
+
+extern struct ll_protocol ethernet_protocol;
+
+/**
+ * Allocate Ethernet device
+ *
+ * @v priv_size		Size of driver private data
+ * @ret netdev		Network device, or NULL
+ */
+#define alloc_etherdev( priv_size ) ( {				\
+	struct net_device *netdev;				\
+	netdev = alloc_netdev ( priv_size );			\
+	if ( netdev )						\
+		netdev->ll_protocol = &ethernet_protocol;	\
+	netdev;	} )
+
+#endif /* _GPXE_ETHERNET_H */