master/debug.c
author Florian Pose <fp@igh-essen.com>
Tue, 31 Oct 2006 15:32:57 +0000
changeset 471 0a6bd71bf4d3
parent 455 204c435fddf9
child 687 6de97f276423
permissions -rw-r--r--
Fixed debug interfaces.
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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; either version 2 of the
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 *  License, or (at your option) any later version.
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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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 *  The right to use EtherCAT Technology is granted and comes free of
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 *  charge under condition of compatibility of product made by
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 *  Licensee. People intending to distribute/sell products based on the
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 *  code, have to sign an agreement to guarantee that products using
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 *  software based on IgH EtherCAT master stay compatible with the actual
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 *  EtherCAT specification (which are released themselves as an open
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 *  standard) as the (only) precondition to have the right to use EtherCAT
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 *  Technology, IP and trade marks.
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 *
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 *****************************************************************************/
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/**
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   \file
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   Ethernet interface for debugging purposes.
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*/
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/*****************************************************************************/
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include "globals.h"
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#include "debug.h"
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/*****************************************************************************/
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// net_device functions
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int ec_dbgdev_open(struct net_device *);
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int ec_dbgdev_stop(struct net_device *);
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int ec_dbgdev_tx(struct sk_buff *, struct net_device *);
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struct net_device_stats *ec_dbgdev_stats(struct net_device *);
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/*****************************************************************************/
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/**
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   Debug constructor.
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   Initializes the debug object, creates a net_device and registeres it.
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*/
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int ec_debug_init(ec_debug_t *dbg /**< debug object */)
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{
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    int result;
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    dbg->opened = 0;
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    memset(&dbg->stats, 0, sizeof(struct net_device_stats));
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    if (!(dbg->dev =
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          alloc_netdev(sizeof(ec_debug_t *), "ec%d", ether_setup))) {
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        EC_ERR("Unable to allocate net_device for debug object!\n");
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        goto out_return;
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    }
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    // initialize net_device
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    dbg->dev->open = ec_dbgdev_open;
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    dbg->dev->stop = ec_dbgdev_stop;
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    dbg->dev->hard_start_xmit = ec_dbgdev_tx;
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    dbg->dev->get_stats = ec_dbgdev_stats;
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    // initialize private data
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    *((ec_debug_t **) netdev_priv(dbg->dev)) = dbg;
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    // connect the net_device to the kernel
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    if ((result = register_netdev(dbg->dev))) {
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        EC_ERR("Unable to register net_device: error %i\n", result);
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        goto out_free;
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    }
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    return 0;
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 out_free:
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    free_netdev(dbg->dev);
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    dbg->dev = NULL;
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 out_return:
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    return -1;
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}
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/*****************************************************************************/
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/**
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   Debug destructor.
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   Unregisteres the net_device and frees allocated memory.
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*/
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void ec_debug_clear(ec_debug_t *dbg /**< debug object */)
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{
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    if (dbg->dev) {
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        unregister_netdev(dbg->dev);
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        free_netdev(dbg->dev);
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    }
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}
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/*****************************************************************************/
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/**
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   Sends frame data to the interface.
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*/
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void ec_debug_send(ec_debug_t *dbg, /**< debug object */
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                   const uint8_t *data, /**< frame data */
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                   size_t size /**< size of the frame data */
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                   )
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{
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    struct sk_buff *skb;
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    if (!dbg->opened) return;
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    // allocate socket buffer
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    if (!(skb = dev_alloc_skb(size))) {
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        dbg->stats.rx_dropped++;
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        return;
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    }
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    // copy frame contents into socket buffer
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    memcpy(skb_put(skb, size), data, size);
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    // update device statistics
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    dbg->stats.rx_packets++;
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    dbg->stats.rx_bytes += size;
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    // pass socket buffer to network stack
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    skb->dev = dbg->dev;
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    skb->protocol = eth_type_trans(skb, dbg->dev);
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    skb->ip_summed = CHECKSUM_UNNECESSARY;
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    netif_rx(skb);
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}
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/******************************************************************************
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 *  NET_DEVICE functions
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 *****************************************************************************/
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/**
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   Opens the virtual network device.
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*/
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int ec_dbgdev_open(struct net_device *dev /**< debug net_device */)
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{
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    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
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    dbg->opened = 1;
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    EC_INFO("Debug interface %s opened.\n", dev->name);
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    return 0;
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}
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/*****************************************************************************/
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/**
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   Stops the virtual network device.
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*/
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int ec_dbgdev_stop(struct net_device *dev /**< debug net_device */)
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{
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    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
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    dbg->opened = 0;
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    EC_INFO("Debug interface %s stopped.\n", dev->name);
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    return 0;
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}
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/*****************************************************************************/
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/**
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   Transmits data via the virtual network device.
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*/
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int ec_dbgdev_tx(struct sk_buff *skb, /**< transmit socket buffer */
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                 struct net_device *dev /**< EoE net_device */
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                 )
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{
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    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
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    dev_kfree_skb(skb);
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    dbg->stats.tx_dropped++;
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    return 0;
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}
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/*****************************************************************************/
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/**
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   Gets statistics about the virtual network device.
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*/
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struct net_device_stats *ec_dbgdev_stats(struct net_device *dev
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                                         /**< debug net_device */)
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{
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    ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev));
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    return &dbg->stats;
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}
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/*****************************************************************************/