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/******************************************************************************

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT Master.

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 *

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 *  The IgH EtherCAT Master is free software; you can redistribute it and/or

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 *  modify it under the terms of the GNU General Public License version 2, as

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 *  published by the Free Software Foundation.

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 *

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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

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 *  Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License along

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 *  with the IgH EtherCAT Master; if not, write to the Free Software

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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 *

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 *  Using the EtherCAT technology and brand is permitted in compliance with

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 *  the industrial property and similar rights of Beckhoff Automation GmbH.

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 *

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 *****************************************************************************/

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/**

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   \file

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   Ethernet over EtherCAT (EoE)

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*/

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/*****************************************************************************/

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#include <linux/list.h>

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#include <linux/netdevice.h>

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#include "globals.h"

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#include "slave.h"

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#include "datagram.h"

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/*****************************************************************************/

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/**

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   Queued frame structure.

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*/

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typedef struct

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{

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    struct list_head queue; /**< list item */

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    struct sk_buff *skb; /**< socket buffer */

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}

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ec_eoe_frame_t;

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/*****************************************************************************/

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typedef struct ec_eoe ec_eoe_t; /**< \see ec_eoe */

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/**

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   Ethernet over EtherCAT (EoE) handler.

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   The master creates one of these objects for each slave that supports the

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   EoE protocol.

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*/

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struct ec_eoe

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{

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    struct list_head list; /**< list item */

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    ec_slave_t *slave; /**< pointer to the corresponding slave */

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    ec_datagram_t datagram; /**< datagram */

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    unsigned int queue_datagram; /**< the datagram is ready for queuing */

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    void (*state)(ec_eoe_t *); /**< state function for the state machine */

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    struct net_device *dev; /**< net_device for virtual ethernet device */

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    struct net_device_stats stats; /**< device statistics */

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    unsigned int opened; /**< net_device is opened */

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    unsigned long rate_jiffies; /**< time of last rate output */

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    struct sk_buff *rx_skb; /**< current rx socket buffer */

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    off_t rx_skb_offset; /**< current write pointer in the socket buffer */

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    size_t rx_skb_size; /**< size of the allocated socket buffer memory */

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    uint8_t rx_expected_fragment; /**< next expected fragment number */

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    uint32_t rx_counter; /**< octets received during last second */

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    uint32_t rx_rate; /**< receive rate (bps) */

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    struct list_head tx_queue; /**< queue for frames to send */

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    unsigned int tx_queue_active; /**< kernel netif queue started */

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    unsigned int tx_queued_frames; /**< number of frames in the queue */

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    spinlock_t tx_queue_lock; /**< spinlock for the send queue */

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    ec_eoe_frame_t *tx_frame; /**< current TX frame */

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    uint8_t tx_frame_number; /**< number of the transmitted frame */

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    uint8_t tx_fragment_number; /**< number of the fragment */

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    size_t tx_offset; /**< number of octets sent */

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    uint32_t tx_counter; /**< octets transmitted during last second */

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    uint32_t tx_rate; /**< transmit rate (bps) */

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};

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/*****************************************************************************/

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int ec_eoe_init(ec_eoe_t *, ec_slave_t *);

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void ec_eoe_clear(ec_eoe_t *);

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void ec_eoe_run(ec_eoe_t *);

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void ec_eoe_queue(ec_eoe_t *);

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int ec_eoe_is_open(const ec_eoe_t *);

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/*****************************************************************************/