+/*
+ * Initialize network adapter and allocate transmit and receive buffers.
+ *
+ * This function implements the Initialize service of the
+ * EFI_SIMPLE_NETWORK_PROTOCOL. See the Unified Extensible Firmware Interface
+ * (UEFI) specification for details.
+ *
+ * @this: pointer to the protocol instance
+ * @extra_rx: extra receive buffer to be allocated
+ * @extra_tx: extra transmit buffer to be allocated
+ * @return: status code
+ */