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

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006  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

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 *  and/or modify it under the terms of the GNU General Public License

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 *  as published by the Free Software Foundation; version 2 of the License.

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 *

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

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

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General 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

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 *  along 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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 *****************************************************************************/

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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 "../include/ecrt.h"

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#include "globals.h"

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#include "slave.h"

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#include "command.h"

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

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/**

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   State of an EoE object.

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*/

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typedef enum

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{

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    EC_EOE_RX_START, /**< start receiving and check for data. */

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    EC_EOE_RX_CHECK, /**< checking frame was sent. */

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    EC_EOE_RX_FETCH, /**< there is new data; fetching frame was sent. */

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    EC_EOE_TX_START, /**< start sending a queued frame. */

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}

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ec_eoe_state_t;

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

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/**

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   Ethernet-over-EtherCAT (EoE) Object.

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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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typedef struct

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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_eoe_state_t state; /**< state of the state machine */

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

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    uint8_t opened; /**< net_device is opened */

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

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

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

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    uint8_t expected_fragment; /**< expected fragment */

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

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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 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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}

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ec_eoe_t;

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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_print(const ec_eoe_t *);

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