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/****************************************************************************
(c) SYSTEC electronic GmbH, D-07973 Greiz, August-Bebel-Str. 29
www.systec-electronic.com
Project: openPOWERLINK
Description: Virtual Ethernet Driver for Linux
License:
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of SYSTEC electronic GmbH nor the names of its
contributors may be used to endorse or promote products derived
from this software without prior written permission. For written
permission, please contact info@systec-electronic.com.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Severability Clause:
If a provision of this License is or becomes illegal, invalid or
unenforceable in any jurisdiction, that shall not affect:
1. the validity or enforceability in that jurisdiction of any other
provision of this License; or
2. the validity or enforceability in other jurisdictions of that or
any other provision of this License.
-------------------------------------------------------------------------
$RCSfile: VirtualEthernetLinux.c,v $
$Author: D.Krueger $
$Revision: 1.8 $ $Date: 2008/11/20 17:06:51 $
$State: Exp $
Build Environment:
-------------------------------------------------------------------------
Revision History:
2006/06/12 -ar: start of the implementation, version 1.00
2006/09/18 d.k.: integration into EPL DLLk module
ToDo:
void netif_carrier_off(struct net_device *dev);
void netif_carrier_on(struct net_device *dev);
****************************************************************************/
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include <net/protocol.h>
#include <net/pkt_sched.h>
#include <linux/if_ether.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/skbuff.h> /* for struct sk_buff */
#include "kernel/VirtualEthernet.h"
#include "kernel/EplDllkCal.h"
#include "kernel/EplDllk.h"
#if(((EPL_MODULE_INTEGRATION) & (EPL_MODULE_VETH)) != 0)
/***************************************************************************/
/* */
/* */
/* G L O B A L D E F I N I T I O N S */
/* */
/* */
/***************************************************************************/
//---------------------------------------------------------------------------
// const defines
//---------------------------------------------------------------------------
#ifndef EPL_VETH_TX_TIMEOUT
//#define EPL_VETH_TX_TIMEOUT (2*HZ)
#define EPL_VETH_TX_TIMEOUT 0 // d.k.: we use no timeout
#endif
//---------------------------------------------------------------------------
// local types
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
// modul globale vars
//---------------------------------------------------------------------------
static struct net_device *pVEthNetDevice_g = NULL;
//---------------------------------------------------------------------------
// local function prototypes
//---------------------------------------------------------------------------
static int VEthOpen(struct net_device *pNetDevice_p);
static int VEthClose(struct net_device *pNetDevice_p);
static int VEthXmit(struct sk_buff *pSkb_p, struct net_device *pNetDevice_p);
static struct net_device_stats *VEthGetStats(struct net_device *pNetDevice_p);
static void VEthTimeout(struct net_device *pNetDevice_p);
static tEplKernel VEthRecvFrame(tEplFrameInfo * pFrameInfo_p);
//=========================================================================//
// //
// P U B L I C F U N C T I O N S //
// //
//=========================================================================//
//---------------------------------------------------------------------------
//
// Function:
//
// Description:
//
//
//
// Parameters:
//
//
// Returns:
//
//
// State:
//
//---------------------------------------------------------------------------
static int VEthOpen(struct net_device *pNetDevice_p)
{
tEplKernel Ret = kEplSuccessful;
//open the device
// struct net_device_stats* pStats = netdev_priv(pNetDevice_p);
//start the interface queue for the network subsystem
netif_start_queue(pNetDevice_p);
// register callback function in DLL
Ret = EplDllkRegAsyncHandler(VEthRecvFrame);
EPL_DBGLVL_VETH_TRACE1
("VEthOpen: EplDllkRegAsyncHandler returned 0x%02X\n", Ret);
return 0;
}
static int VEthClose(struct net_device *pNetDevice_p)
{
tEplKernel Ret = kEplSuccessful;
EPL_DBGLVL_VETH_TRACE0("VEthClose\n");
Ret = EplDllkDeregAsyncHandler(VEthRecvFrame);
//stop the interface queue for the network subsystem
netif_stop_queue(pNetDevice_p);
return 0;
}
static int VEthXmit(struct sk_buff *pSkb_p, struct net_device *pNetDevice_p)
{
tEplKernel Ret = kEplSuccessful;
tEplFrameInfo FrameInfo;
//transmit function
struct net_device_stats *pStats = netdev_priv(pNetDevice_p);
//save timestemp
pNetDevice_p->trans_start = jiffies;
FrameInfo.m_pFrame = (tEplFrame *) pSkb_p->data;
FrameInfo.m_uiFrameSize = pSkb_p->len;
//call send fkt on DLL
Ret = EplDllkCalAsyncSend(&FrameInfo, kEplDllAsyncReqPrioGeneric);
if (Ret != kEplSuccessful) {
EPL_DBGLVL_VETH_TRACE1
("VEthXmit: EplDllkCalAsyncSend returned 0x%02X\n", Ret);
netif_stop_queue(pNetDevice_p);
goto Exit;
} else {
EPL_DBGLVL_VETH_TRACE0("VEthXmit: frame passed to DLL\n");
dev_kfree_skb(pSkb_p);
//set stats for the device
pStats->tx_packets++;
pStats->tx_bytes += FrameInfo.m_uiFrameSize;
}
Exit:
return NETDEV_TX_OK;
}
static struct net_device_stats *VEthGetStats(struct net_device *pNetDevice_p)
{
EPL_DBGLVL_VETH_TRACE0("VEthGetStats\n");
return netdev_priv(pNetDevice_p);
}
static void VEthTimeout(struct net_device *pNetDevice_p)
{
EPL_DBGLVL_VETH_TRACE0("VEthTimeout(\n");
// $$$ d.k.: move to extra function, which is called by DLL when new space is available in TxFifo
if (netif_queue_stopped(pNetDevice_p)) {
netif_wake_queue(pNetDevice_p);
}
}
static tEplKernel VEthRecvFrame(tEplFrameInfo * pFrameInfo_p)
{
tEplKernel Ret = kEplSuccessful;
struct net_device *pNetDevice = pVEthNetDevice_g;
struct net_device_stats *pStats = netdev_priv(pNetDevice);
struct sk_buff *pSkb;
EPL_DBGLVL_VETH_TRACE1("VEthRecvFrame: FrameSize=%u\n",
pFrameInfo_p->m_uiFrameSize);
pSkb = dev_alloc_skb(pFrameInfo_p->m_uiFrameSize + 2);
if (pSkb == NULL) {
pStats->rx_dropped++;
goto Exit;
}
pSkb->dev = pNetDevice;
skb_reserve(pSkb, 2);
memcpy((void *)skb_put(pSkb, pFrameInfo_p->m_uiFrameSize),
pFrameInfo_p->m_pFrame, pFrameInfo_p->m_uiFrameSize);
pSkb->protocol = eth_type_trans(pSkb, pNetDevice);
pSkb->ip_summed = CHECKSUM_UNNECESSARY;
// call netif_rx with skb
netif_rx(pSkb);
EPL_DBGLVL_VETH_TRACE1("VEthRecvFrame: SrcMAC=0x%llx\n",
AmiGetQword48FromBe(pFrameInfo_p->m_pFrame->
m_be_abSrcMac));
// update receive statistics
pStats->rx_packets++;
pStats->rx_bytes += pFrameInfo_p->m_uiFrameSize;
Exit:
return Ret;
}
static const struct net_device_ops epl_netdev_ops = {
.ndo_open = VEthOpen,
.ndo_stop = VEthClose,
.ndo_get_stats = VEthGetStats,
.ndo_start_xmit = VEthXmit,
.ndo_tx_timeout = VEthTimeout,
.ndo_change_mtu = eth_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
tEplKernel VEthAddInstance(tEplDllkInitParam *pInitParam_p)
{
tEplKernel Ret = kEplSuccessful;
// allocate net device structure with priv pointing to stats structure
pVEthNetDevice_g =
alloc_netdev(sizeof(struct net_device_stats), EPL_VETH_NAME,
ether_setup);
// pVEthNetDevice_g = alloc_etherdev(sizeof (struct net_device_stats));
if (pVEthNetDevice_g == NULL) {
Ret = kEplNoResource;
goto Exit;
}
pVEthNetDevice_g->netdev_ops = &epl_netdev_ops;
pVEthNetDevice_g->watchdog_timeo = EPL_VETH_TX_TIMEOUT;
pVEthNetDevice_g->destructor = free_netdev;
// copy own MAC address to net device structure
memcpy(pVEthNetDevice_g->dev_addr, pInitParam_p->m_be_abSrcMac, 6);
//register VEth to the network subsystem
if (register_netdev(pVEthNetDevice_g)) {
EPL_DBGLVL_VETH_TRACE0
("VEthAddInstance: Could not register VEth...\n");
} else {
EPL_DBGLVL_VETH_TRACE0
("VEthAddInstance: Register VEth successfull...\n");
}
Exit:
return Ret;
}
tEplKernel VEthDelInstance(void)
{
tEplKernel Ret = kEplSuccessful;
if (pVEthNetDevice_g != NULL) {
//unregister VEth from the network subsystem
unregister_netdev(pVEthNetDevice_g);
// destructor was set to free_netdev,
// so we do not need to call free_netdev here
pVEthNetDevice_g = NULL;
}
return Ret;
}
#endif // (((EPL_MODULE_INTEGRATION) & (EPL_MODULE_VETH)) != 0)
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