[intelxl] Provide a mechanism for handling "send to VF" events

Provide a weak stub function for handling the "send to VF" event used
for communications between the physical and virtual function drivers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/intelxl.c

 	return 0;
 }
 
+/**
+ * Handle virtual function event (when VF driver is not present)
+ *
+ * @v netdev		Network device
+ * @v evt		Admin queue event descriptor
+ * @v buf		Admin queue event data buffer
+ */
+__weak void
+intelxlvf_admin_event ( struct net_device *netdev __unused,
+			struct intelxl_admin_descriptor *evt __unused,
+			union intelxl_admin_buffer *buf __unused ) {
+
+	/* Nothing to do */
+}
+
 /**
  * Refill admin event queue
  *
 		case cpu_to_le16 ( INTELXL_ADMIN_LINK ):
 			intelxl_admin_link ( netdev );
 			break;
+		case cpu_to_le16 ( INTELXL_ADMIN_SEND_TO_VF ):
+			intelxlvf_admin_event ( netdev, evt, buf );
+			break;
 		default:
 			DBGC ( intelxl, "INTELXL %p admin event %#x "
 			       "unrecognised opcode %#04x\n", intelxl,

src/drivers/net/intelxl.h

 /** Link is up */
 #define INTELXL_ADMIN_LINK_UP 0x01
 
+/** Admin queue Send Message to PF command */
+#define INTELXL_ADMIN_SEND_TO_PF 0x0801
+
+/** Admin queue Send Message to VF command */
+#define INTELXL_ADMIN_SEND_TO_VF 0x0802
+
 /** Admin queue command parameters */
 union intelxl_admin_params {
 	/** Additional data buffer command parameters */
 	struct io_buffer *rx_iobuf[INTELXL_RX_NUM_DESC];
 };
 
+extern void intelxlvf_admin_event ( struct net_device *netdev,
+				    struct intelxl_admin_descriptor *evt,
+				    union intelxl_admin_buffer *buf );
+
 #endif /* _INTELXL_H */