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