master/debug.c
author Knud Baastrup <kba@deif.com>
Tue, 14 Apr 2015 10:12:55 -0400
changeset 2625 e25af8bd3957
parent 2589 2b9c78543663
permissions -rw-r--r--
Eoe mac address now derived from unique mac.
The EoE MAC address is now derived from the NIC part of the first global
unique MAC address of the linked list of available network interfaces or
otherwise the MAC address used by the EtherCAT master. The EoE MAC address
will get the format 02:NIC:NIC:NIC:RP:RP where NIC comes from the unique MAC
address (if available) and RP is the ring position of the EoE slave.
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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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 *  ---
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 *
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 *  The license mentioned above concerns the source code only. Using the
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 *  EtherCAT technology and brand is only permitted in compliance with the
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 *  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/version.h>
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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 "master.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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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
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/** Device operations for debug interfaces.
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 */
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static const struct net_device_ops ec_dbg_netdev_ops =
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{
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    .ndo_open = ec_dbgdev_open,
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    .ndo_stop = ec_dbgdev_stop,
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    .ndo_start_xmit = ec_dbgdev_tx,
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    .ndo_get_stats = ec_dbgdev_stats,
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};
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#endif
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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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        ec_device_t *device, /**< EtherCAT device. */
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        const char *name /**< Interface name. */
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        )
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{
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    dbg->device = device;
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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_MASTER_ERR(device->master, "Unable to allocate net_device"
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                " 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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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
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    dbg->dev->netdev_ops = &ec_dbg_netdev_ops;
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#else
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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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#endif
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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_MASTER_WARN(dbg->device->master, "Unable to register net_device:"
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                " 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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 * \return Always zero (success).
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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_MASTER_INFO(dbg->device->master, "Debug interface %s opened.\n",
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            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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 * \return Always zero (success).
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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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        )
231
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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_MASTER_INFO(dbg->device->master, "Debug interface %s stopped.\n",
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            dev->name);
231
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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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 * \return Always zero (success).
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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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 * \return Statistics.
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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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        )
231
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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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/*****************************************************************************/