master/debug.c
author Florian Pose <fp@igh-essen.com>
Mon, 26 Jan 2009 11:51:53 +0000
changeset 1331 7cd33a77f926
parent 1326 ef907b0b5125
child 1363 11c0b2caa253
permissions -rw-r--r--
merge -c1609 branches/stable-1.4: INSTALL, README.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2006-2008  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 and/or
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 *  modify it under the terms of the GNU General Public License version 2, as
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 *  published by the Free Software Foundation.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
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 *  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 along
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 *  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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 *  Using the EtherCAT technology and brand is permitted in compliance with
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 *  the industrial property and similar rights of Beckhoff Automation GmbH.
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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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/** Debug interface constructor.
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 *
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 * Initializes the debug object, creates a net_device and registeres it.
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 *
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 * \retval  0 Success.
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 * \retval <0 Error code.
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 */
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int ec_debug_init(
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        ec_debug_t *dbg, /**< debug object */
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        const char *name /**< interface name */
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        )
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{
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    dbg->registered = 0;
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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 *), name, ether_setup))) {
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        EC_ERR("Unable to allocate net_device for debug object!\n");
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        return -ENODEV;
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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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    return 0;
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}
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/*****************************************************************************/
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/** Debug interface destructor.
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 *
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 * Unregisters the net_device and frees allocated memory.
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 */
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void ec_debug_clear(
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        ec_debug_t *dbg /**< debug object */
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        )
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{
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    ec_debug_unregister(dbg);
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    free_netdev(dbg->dev);
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}
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/*****************************************************************************/
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/** Register debug interface.
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 */
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void ec_debug_register(
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        ec_debug_t *dbg, /**< debug object */
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        const struct net_device *net_dev /**< 'Real' Ethernet device. */
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        )
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{
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    int result;
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    ec_debug_unregister(dbg);
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    // use the Ethernet address of the physical device for the debug device
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    memcpy(dbg->dev->dev_addr, net_dev->dev_addr, ETH_ALEN);
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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_WARN("Unable to register net_device: error %i\n", result);
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    } else {
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        dbg->registered = 1;
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    }
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}
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/*****************************************************************************/
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/** Unregister debug interface.
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 */
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void ec_debug_unregister(
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        ec_debug_t *dbg /**< debug object */
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        )
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{
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    if (dbg->registered) {
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        dbg->opened = 0;
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        dbg->registered = 0;
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        unregister_netdev(dbg->dev);
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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(
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        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)
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        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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/** Opens the virtual network device.
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 */
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int ec_dbgdev_open(
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        struct net_device *dev /**< debug 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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    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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/** Stops the virtual network device.
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 */
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int ec_dbgdev_stop(
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        struct net_device *dev /**< debug 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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    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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/** Transmits data via the virtual network device.
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 */
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int ec_dbgdev_tx(
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        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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/** Gets statistics about the virtual network device.
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 */
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struct net_device_stats *ec_dbgdev_stats(
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        struct net_device *dev /**< debug 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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    return &dbg->stats;
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}
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/*****************************************************************************/