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/*
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 * Copyright (c) 2009 Lukas Mejdrech
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup netif
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 *  @{
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 */
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/** @file
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 *  Network interface module skeleton.
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 *  The skeleton has to be part of each network interface module.
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 *  The skeleton can be also part of the module bundled with the network interface layer.
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 */
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#ifndef __NET_NETIF_H__
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#define __NET_NETIF_H__
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#include <async.h>
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#include <rwlock.h>
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#include <ipc/ipc.h>
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#include "../err.h"
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#include "../include/device.h"
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#include "../structures/packet/packet.h"
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/** Network interface module skeleton global data.
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 */
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typedef struct netif_globals    netif_globals_t;
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/** Type definition of the device specific data.
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 *  @see netif_device
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 */
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typedef struct netif_device device_t;
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/** Type definition of the device specific data pointer.
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 *  @see netif_device
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 */
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typedef device_t *          device_ref;
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/** Device map.
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 *  Maps device identifiers to the network interface device specific data.
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 *  @see device.h
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 */
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DEVICE_MAP_DECLARE( device_map, device_t );
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/** Network interface device specific data.
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 */
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struct  netif_device{
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    /** Device identifier.
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     */
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    device_id_t device_id;
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    /** Receiving network interface layer phone.
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     */
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    int     nil_phone;
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    /** Actual device state.
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     */
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    device_state_t  state;
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    /** Driver specific data.
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     */
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    void *      specific;
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};
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/** Network interface module skeleton global data.
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 */
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struct  netif_globals{
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    /** Networking module phone.
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     */
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    int     net_phone;
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    /** Device map.
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     */
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    device_map_t    device_map;
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    /** Safety lock.
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     */
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    rwlock_t    lock;
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};
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/** Finds the device specific data.
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 *  @param device_id The device identifier. Input parameter.
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 *  @param device The device specific data. Output parameter.
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 *  @returns EOK on success.
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 *  @returns ENOENT if device is not found.
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 *  @returns EPERM if the device is not initialized.
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 */
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int find_device( device_id_t device_id, device_ref * device );
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/** Clears the usage statistics.
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 *  @param stats The usage statistics. Input parameter.
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 */
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void    null_device_stats( device_stats_ref stats );
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// prepared for future optimalizations
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/** Releases the given packet.
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 *  @param packet_id The packet identifier. Input parameter.
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 */
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void    netif_pq_release( packet_id_t packet_id );
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/** Allocates new packet to handle the given content size.
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 *  @param content The minimum content size. Input parameter.
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 *  @returns The allocated packet.
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 *  @returns NULL if there is an error.
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 */
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packet_t netif_packet_get_1( size_t content );
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/** Processes the netif module messages.
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 *  @param callid The message identifier. Input parameter.
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 *  @param call The message parameters. Input parameter.
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 *  @param answer The message answer parameters. Output parameter.
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 *  @param answer_count The last parameter for the actual answer in the answer parameter. Output parameter.
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 *  @returns EOK on success.
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 *  @returns ENOTSUP if the message is not known.
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 *  @returns Other error codes as defined for each specific module message function.
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 *  @see netif_interface.h
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 *  @see IS_NET_NETIF_MESSAGE()
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 */
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int netif_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count );
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/** Initializes the netif module.
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 *  The function has to be defined in each module.
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 *  @param client_connection The client connection functio to be registered. Input parameter.
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 *  @returns EOK on success.
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 *  @returns Other error codes as defined for each specific module message function.
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 */
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int netif_init_module( async_client_conn_t client_connection );
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/** Starts and maintains the netif module until terminated.
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 *  @returns EOK after the module is terminated.
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 */
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int netif_run_module( void );
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#endif
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/** @}
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 */
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