1

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

     2

 *

     3

 *  $Id$

     4

 *

     5

 *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH

     6

 *

     7

 *  This file is part of the IgH EtherCAT Master.

     8

 *

     9

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

    10

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

    11

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

    12

 *  License, or (at your option) any later version.

    13

 *

    14

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

    15

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

    16

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    17

 *  GNU General Public License for more details.

    18

 *

    19

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

    20

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

    21

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

    22

 *

    23

 *  The right to use EtherCAT Technology is granted and comes free of

    24

 *  charge under condition of compatibility of product made by

    25

 *  Licensee. People intending to distribute/sell products based on the

    26

 *  code, have to sign an agreement to guarantee that products using

    27

 *  software based on IgH EtherCAT master stay compatible with the actual

    28

 *  EtherCAT specification (which are released themselves as an open

    29

 *  standard) as the (only) precondition to have the right to use EtherCAT

    30

 *  Technology, IP and trade marks.

    31

 *

    32

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

    33

    34

/**

    35

   \file

    36

   Ethernet interface for debugging purposes.

    37

*/

    38

    39

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

    40

    41

#include <linux/etherdevice.h>

    42

    43

#include "globals.h"

    44

#include "debug.h"

    45

    46

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

    47

    48

// net_device functions

    49

int ec_dbgdev_open(struct net_device *);

    50

int ec_dbgdev_stop(struct net_device *);

    51

struct net_device_stats *ec_dbgdev_stats(struct net_device *);

    52

    53

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

    54

    55

/**

    56

   Debug constructor.

    57

   Initializes the debug object, creates a net_device and registeres it.

    58

*/

    59

    60

int ec_debug_init(ec_debug_t *dbg /**< debug object */)

    61

{

    62

    int result;

    63

    64

    dbg->opened = 0;

    65

    memset(&dbg->stats, 0, sizeof(struct net_device_stats));

    66

    67

    if (!(dbg->dev =

    68

          alloc_netdev(sizeof(ec_debug_t *), "ec%d", ether_setup))) {

    69

        EC_ERR("Unable to allocate net_device for debug object!\n");

    70

        goto out_return;

    71

    }

    72

    73

    // initialize net_device

    74

    dbg->dev->open = ec_dbgdev_open;

    75

    dbg->dev->stop = ec_dbgdev_stop;

    76

    dbg->dev->get_stats = ec_dbgdev_stats;

    77

    78

    // initialize private data

    79

    *((ec_debug_t **) netdev_priv(dbg->dev)) = dbg;

    80

    81

    // connect the net_device to the kernel

    82

    if ((result = register_netdev(dbg->dev))) {

    83

        EC_ERR("Unable to register net_device: error %i\n", result);

    84

        goto out_free;

    85

    }

    86

    87

    return 0;

    88

    89

 out_free:

    90

    free_netdev(dbg->dev);

    91

    dbg->dev = NULL;

    92

 out_return:

    93

    return -1;

    94

}

    95

    96

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

    97

    98

/**

    99

   Debug destructor.

   100

   Unregisteres the net_device and frees allocated memory.

   101

*/

   102

   103

void ec_debug_clear(ec_debug_t *dbg /**< debug object */)

   104

{

   105

    if (dbg->dev) {

   106

        unregister_netdev(dbg->dev);

   107

        free_netdev(dbg->dev);

   108

    }

   109

}

   110

   111

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

   112

   113

/**

   114

   Sends frame data to the interface.

   115

*/

   116

   117

void ec_debug_send(ec_debug_t *dbg, /**< debug object */

   118

                   const uint8_t *data, /**< frame data */

   119

                   size_t size /**< size of the frame data */

   120

                   )

   121

{

   122

    struct sk_buff *skb;

   123

   124

    if (!dbg->opened) return;

   125

   126

    // allocate socket buffer

   127

    if (!(skb = dev_alloc_skb(size))) {

   128

        dbg->stats.rx_dropped++;

   129

        return;

   130

    }

   131

   132

    // copy frame contents into socket buffer

   133

    memcpy(skb_put(skb, size), data, size);

   134

   135

    // update device statistics

   136

    dbg->stats.rx_packets++;

   137

    dbg->stats.rx_bytes += size;

   138

   139

    // pass socket buffer to network stack

   140

    skb->dev = dbg->dev;

   141

    skb->protocol = eth_type_trans(skb, dbg->dev);

   142

    skb->ip_summed = CHECKSUM_UNNECESSARY;

   143

    netif_rx(skb);

   144

}

   145

   146

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

   147

 *  NET_DEVICE functions

   148

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

   149

   150

/**

   151

   Opens the virtual network device.

   152

*/

   153

   154

int ec_dbgdev_open(struct net_device *dev /**< debug net_device */)

   155

{

   156

    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));

   157

    dbg->opened = 1;

   158

    EC_INFO("debug interface %s opened.\n", dev->name);

   159

    return 0;

   160

}

   161

   162

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

   163

   164

/**

   165

   Stops the virtual network device.

   166

*/

   167

   168

int ec_dbgdev_stop(struct net_device *dev /**< debug net_device */)

   169

{

   170

    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));

   171

    dbg->opened = 0;

   172

    EC_INFO("debug interface %s stopped.\n", dev->name);

   173

    return 0;

   174

}

   175

   176

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

   177

   178

/**

   179

   Gets statistics about the virtual network device.

   180

*/

   181

   182

struct net_device_stats *ec_dbgdev_stats(struct net_device *dev

   183

                                         /**< debug net_device */)

   184

{

   185

    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));

   186

    return &dbg->stats;

   187

}

   188

   189

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