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/netdevice.h>

    42

#include <linux/etherdevice.h>

    43

    44

#include "globals.h"

    45

#include "debug.h"

    46

    47

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

    48

    49

// net_device functions

    50

int ec_dbgdev_open(struct net_device *);

    51

int ec_dbgdev_stop(struct net_device *);

    52

struct net_device_stats *ec_dbgdev_stats(struct net_device *);

    53

    54

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

    55

    56

/**

    57

   Debug constructor.

    58

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

    59

*/

    60

    61

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

    62

{

    63

    int result;

    64

    65

    dbg->opened = 0;

    66

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

    67

    68

    if (!(dbg->dev =

    69

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

    70

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

    71

        goto out_return;

    72

    }

    73

    74

    // initialize net_device

    75

    dbg->dev->open = ec_dbgdev_open;

    76

    dbg->dev->stop = ec_dbgdev_stop;

    77

    dbg->dev->get_stats = ec_dbgdev_stats;

    78

    79

    // initialize private data

    80

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

    81

    82

    // connect the net_device to the kernel

    83

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

    84

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

    85

        goto out_free;

    86

    }

    87

    88

    return 0;

    89

    90

 out_free:

    91

    free_netdev(dbg->dev);

    92

    dbg->dev = NULL;

    93

 out_return:

    94

    return -1;

    95

}

    96

    97

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

    98

    99

/**

   100

   Debug destructor.

   101

   Unregisteres the net_device and frees allocated memory.

   102

*/

   103

   104

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

   105

{

   106

    if (dbg->dev) {

   107

        unregister_netdev(dbg->dev);

   108

        free_netdev(dbg->dev);

   109

    }

   110

}

   111

   112

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

   113

   114

/**

   115

   Sends frame data to the interface.

   116

*/

   117

   118

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

   119

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

   120

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

   121

                   )

   122

{

   123

    struct sk_buff *skb;

   124

   125

    if (!dbg->opened) return;

   126

   127

    // allocate socket buffer

   128

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

   129

        dbg->stats.rx_dropped++;

   130

        return;

   131

    }

   132

   133

    // copy frame contents into socket buffer

   134

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

   135

   136

    // update device statistics

   137

    dbg->stats.rx_packets++;

   138

    dbg->stats.rx_bytes += size;

   139

   140

    // pass socket buffer to network stack

   141

    skb->dev = dbg->dev;

   142

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

   143

    skb->ip_summed = CHECKSUM_UNNECESSARY;

   144

    netif_rx(skb);

   145

}

   146

   147

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

   148

 *  NET_DEVICE functions

   149

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

   150

   151

/**

   152

   Opens the virtual network device.

   153

*/

   154

   155

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

   156

{

   157

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

   158

    dbg->opened = 1;

   159

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

   160

    return 0;

   161

}

   162

   163

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

   164

   165

/**

   166

   Stops the virtual network device.

   167

*/

   168

   169

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

   170

{

   171

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

   172

    dbg->opened = 0;

   173

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

   174

    return 0;

   175

}

   176

   177

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

   178

   179

/**

   180

   Gets statistics about the virtual network device.

   181

*/

   182

   183

struct net_device_stats *ec_dbgdev_stats(struct net_device *dev

   184

                                         /**< debug net_device */)

   185

{

   186

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

   187

    return &dbg->stats;

   188

}

   189

   190

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