fp@231: /******************************************************************************
fp@231:  *
fp@231:  *  $Id$
fp@231:  *
fp@231:  *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
fp@231:  *
fp@231:  *  This file is part of the IgH EtherCAT Master.
fp@231:  *
fp@231:  *  The IgH EtherCAT Master is free software; you can redistribute it
fp@231:  *  and/or modify it under the terms of the GNU General Public License
fp@246:  *  as published by the Free Software Foundation; either version 2 of the
fp@246:  *  License, or (at your option) any later version.
fp@231:  *
fp@231:  *  The IgH EtherCAT Master is distributed in the hope that it will be
fp@231:  *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@231:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
fp@231:  *  GNU General Public License for more details.
fp@231:  *
fp@231:  *  You should have received a copy of the GNU General Public License
fp@231:  *  along with the IgH EtherCAT Master; if not, write to the Free Software
fp@231:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
fp@231:  *
fp@246:  *  The right to use EtherCAT Technology is granted and comes free of
fp@246:  *  charge under condition of compatibility of product made by
fp@246:  *  Licensee. People intending to distribute/sell products based on the
fp@246:  *  code, have to sign an agreement to guarantee that products using
fp@246:  *  software based on IgH EtherCAT master stay compatible with the actual
fp@246:  *  EtherCAT specification (which are released themselves as an open
fp@246:  *  standard) as the (only) precondition to have the right to use EtherCAT
fp@246:  *  Technology, IP and trade marks.
fp@246:  *
fp@231:  *****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    \file
fp@231:    Ethernet interface for debugging purposes.
fp@231: */
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@294: #include <linux/netdevice.h>
fp@231: #include <linux/etherdevice.h>
fp@231: 
fp@231: #include "globals.h"
fp@231: #include "debug.h"
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: // net_device functions
fp@231: int ec_dbgdev_open(struct net_device *);
fp@231: int ec_dbgdev_stop(struct net_device *);
fp@1732: int ec_dbgdev_tx(struct sk_buff *, struct net_device *);
fp@231: struct net_device_stats *ec_dbgdev_stats(struct net_device *);
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Debug constructor.
fp@231:    Initializes the debug object, creates a net_device and registeres it.
fp@231: */
fp@231: 
fp@1744: int ec_debug_init(
fp@1744:         ec_debug_t *dbg, /**< debug object */
fp@1744:         const char *name /**< interface name */
fp@1744:         )
fp@231: {
fp@231:     int result;
fp@231: 
fp@231:     dbg->opened = 0;
fp@231:     memset(&dbg->stats, 0, sizeof(struct net_device_stats));
fp@231: 
fp@231:     if (!(dbg->dev =
fp@1744:           alloc_netdev(sizeof(ec_debug_t *), name, ether_setup))) {
fp@231:         EC_ERR("Unable to allocate net_device for debug object!\n");
fp@231:         goto out_return;
fp@231:     }
fp@231: 
fp@231:     // initialize net_device
fp@231:     dbg->dev->open = ec_dbgdev_open;
fp@231:     dbg->dev->stop = ec_dbgdev_stop;
fp@1732:     dbg->dev->hard_start_xmit = ec_dbgdev_tx;
fp@231:     dbg->dev->get_stats = ec_dbgdev_stats;
fp@231: 
fp@231:     // initialize private data
fp@231:     *((ec_debug_t **) netdev_priv(dbg->dev)) = dbg;
fp@231: 
fp@231:     // connect the net_device to the kernel
fp@231:     if ((result = register_netdev(dbg->dev))) {
fp@231:         EC_ERR("Unable to register net_device: error %i\n", result);
fp@231:         goto out_free;
fp@231:     }
fp@231: 
fp@231:     return 0;
fp@231: 
fp@231:  out_free:
fp@231:     free_netdev(dbg->dev);
fp@231:     dbg->dev = NULL;
fp@231:  out_return:
fp@231:     return -1;
fp@231: }
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Debug destructor.
fp@231:    Unregisteres the net_device and frees allocated memory.
fp@231: */
fp@231: 
fp@231: void ec_debug_clear(ec_debug_t *dbg /**< debug object */)
fp@231: {
fp@231:     if (dbg->dev) {
fp@231:         unregister_netdev(dbg->dev);
fp@231:         free_netdev(dbg->dev);
fp@231:     }
fp@231: }
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Sends frame data to the interface.
fp@231: */
fp@231: 
fp@231: void ec_debug_send(ec_debug_t *dbg, /**< debug object */
fp@231:                    const uint8_t *data, /**< frame data */
fp@231:                    size_t size /**< size of the frame data */
fp@231:                    )
fp@231: {
fp@231:     struct sk_buff *skb;
fp@231: 
fp@231:     if (!dbg->opened) return;
fp@231: 
fp@231:     // allocate socket buffer
fp@231:     if (!(skb = dev_alloc_skb(size))) {
fp@231:         dbg->stats.rx_dropped++;
fp@231:         return;
fp@231:     }
fp@231: 
fp@231:     // copy frame contents into socket buffer
fp@231:     memcpy(skb_put(skb, size), data, size);
fp@231: 
fp@231:     // update device statistics
fp@231:     dbg->stats.rx_packets++;
fp@231:     dbg->stats.rx_bytes += size;
fp@231: 
fp@231:     // pass socket buffer to network stack
fp@231:     skb->dev = dbg->dev;
fp@231:     skb->protocol = eth_type_trans(skb, dbg->dev);
fp@231:     skb->ip_summed = CHECKSUM_UNNECESSARY;
fp@231:     netif_rx(skb);
fp@231: }
fp@231: 
fp@231: /******************************************************************************
fp@231:  *  NET_DEVICE functions
fp@231:  *****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Opens the virtual network device.
fp@231: */
fp@231: 
fp@231: int ec_dbgdev_open(struct net_device *dev /**< debug net_device */)
fp@231: {
fp@231:     ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
fp@231:     dbg->opened = 1;
fp@1732:     EC_INFO("Debug interface %s opened.\n", dev->name);
fp@231:     return 0;
fp@231: }
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Stops the virtual network device.
fp@231: */
fp@231: 
fp@231: int ec_dbgdev_stop(struct net_device *dev /**< debug net_device */)
fp@231: {
fp@231:     ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
fp@231:     dbg->opened = 0;
fp@1732:     EC_INFO("Debug interface %s stopped.\n", dev->name);
fp@1732:     return 0;
fp@1732: }
fp@1732: 
fp@1732: /*****************************************************************************/
fp@1732: 
fp@1732: /**
fp@1732:    Transmits data via the virtual network device.
fp@1732: */
fp@1732: 
fp@1732: int ec_dbgdev_tx(struct sk_buff *skb, /**< transmit socket buffer */
fp@1732:                  struct net_device *dev /**< EoE net_device */
fp@1732:                  )
fp@1732: {
fp@1732:     ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
fp@1732: 
fp@1732:     dev_kfree_skb(skb);
fp@1732:     dbg->stats.tx_dropped++;
fp@231:     return 0;
fp@231: }
fp@231: 
fp@231: /*****************************************************************************/
fp@231: 
fp@231: /**
fp@231:    Gets statistics about the virtual network device.
fp@231: */
fp@231: 
fp@231: struct net_device_stats *ec_dbgdev_stats(struct net_device *dev
fp@231:                                          /**< debug net_device */)
fp@231: {
fp@231:     ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
fp@231:     return &dbg->stats;
fp@231: }
fp@231: 
fp@231: /*****************************************************************************/