author | Florian Pose <fp@igh-essen.com> |
Sun, 06 Jun 2010 22:40:22 +0200 | |
changeset 1944 | 73896ef6d077 |
parent 1921 | d9cf40facbc4 |
child 2522 | ec403cf308eb |
permissions | -rw-r--r-- |
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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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|
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ec_debug_unregister(dbg); |
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|
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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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|
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// connect the net_device to the kernel |
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if ((result = register_netdev(dbg->dev))) { |
1921 | 141 |
EC_MASTER_WARN(dbg->device->master, "Unable to register net_device:" |
142 |
" 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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/*****************************************************************************/ |
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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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/*****************************************************************************/ |
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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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|
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if (!dbg->opened) |
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return; |
231
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177 |
|
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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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181 |
return; |
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182 |
} |
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183 |
|
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184 |
// copy frame contents into socket buffer |
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185 |
memcpy(skb_put(skb, size), data, size); |
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186 |
|
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187 |
// update device statistics |
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188 |
dbg->stats.rx_packets++; |
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189 |
dbg->stats.rx_bytes += size; |
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190 |
|
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191 |
// pass socket buffer to network stack |
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192 |
skb->dev = dbg->dev; |
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193 |
skb->protocol = eth_type_trans(skb, dbg->dev); |
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194 |
skb->ip_summed = CHECKSUM_UNNECESSARY; |
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195 |
netif_rx(skb); |
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196 |
} |
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197 |
|
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|
198 |
/****************************************************************************** |
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199 |
* NET_DEVICE functions |
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200 |
*****************************************************************************/ |
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201 |
|
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202 |
/** Opens the virtual network device. |
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203 |
*/ |
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204 |
int ec_dbgdev_open( |
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205 |
struct net_device *dev /**< debug net_device */ |
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206 |
) |
231
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207 |
{ |
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208 |
ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev)); |
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209 |
dbg->opened = 1; |
1921 | 210 |
EC_MASTER_INFO(dbg->device->master, "Debug interface %s opened.\n", |
211 |
dev->name); |
|
231
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212 |
return 0; |
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|
213 |
} |
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214 |
|
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215 |
/*****************************************************************************/ |
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216 |
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217 |
/** Stops the virtual network device. |
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218 |
*/ |
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219 |
int ec_dbgdev_stop( |
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220 |
struct net_device *dev /**< debug net_device */ |
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|
221 |
) |
231
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|
222 |
{ |
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|
223 |
ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev)); |
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|
224 |
dbg->opened = 0; |
1921 | 225 |
EC_MASTER_INFO(dbg->device->master, "Debug interface %s stopped.\n", |
226 |
dev->name); |
|
231
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227 |
return 0; |
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|
228 |
} |
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|
229 |
|
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230 |
/*****************************************************************************/ |
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|
231 |
|
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232 |
/** Transmits data via the virtual network device. |
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233 |
*/ |
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234 |
int ec_dbgdev_tx( |
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235 |
struct sk_buff *skb, /**< transmit socket buffer */ |
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|
236 |
struct net_device *dev /**< EoE net_device */ |
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|
237 |
) |
471 | 238 |
{ |
239 |
ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev)); |
|
240 |
||
241 |
dev_kfree_skb(skb); |
|
242 |
dbg->stats.tx_dropped++; |
|
243 |
return 0; |
|
244 |
} |
|
245 |
||
246 |
/*****************************************************************************/ |
|
247 |
||
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248 |
/** Gets statistics about the virtual network device. |
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249 |
*/ |
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250 |
struct net_device_stats *ec_dbgdev_stats( |
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251 |
struct net_device *dev /**< debug net_device */ |
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252 |
) |
231
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|
253 |
{ |
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|
254 |
ec_debug_t *dbg = *((ec_debug_t **) netdev_priv(dev)); |
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255 |
return &dbg->stats; |
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|
256 |
} |
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|
257 |
|
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|
258 |
/*****************************************************************************/ |