1 /****************************************************************************
3 (c) SYSTEC electronic GmbH, D-07973 Greiz, August-Bebel-Str. 29
4 www.systec-electronic.com
8 Description: Virtual Ethernet Driver for Linux
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48 any other provision of this License.
50 -------------------------------------------------------------------------
52 $RCSfile: VirtualEthernetLinux.c,v $
56 $Revision: 1.8 $ $Date: 2008/11/20 17:06:51 $
62 -------------------------------------------------------------------------
66 2006/06/12 -ar: start of the implementation, version 1.00
68 2006/09/18 d.k.: integration into EPL DLLk module
72 void netif_carrier_off(struct net_device *dev);
73 void netif_carrier_on(struct net_device *dev);
75 ****************************************************************************/
77 #include <linux/module.h>
78 #include <linux/netdevice.h>
79 #include <linux/etherdevice.h>
80 #include <linux/kernel.h>
81 #include <linux/init.h>
82 #include <linux/if_arp.h>
85 #include <net/protocol.h>
86 #include <net/pkt_sched.h>
87 #include <linux/if_ether.h>
90 #include <linux/udp.h>
92 #include <linux/types.h>
93 #include <linux/skbuff.h> /* for struct sk_buff */
95 #include "kernel/VirtualEthernet.h"
96 #include "kernel/EplDllkCal.h"
97 #include "kernel/EplDllk.h"
99 #if(((EPL_MODULE_INTEGRATION) & (EPL_MODULE_VETH)) != 0)
101 /***************************************************************************/
104 /* G L O B A L D E F I N I T I O N S */
107 /***************************************************************************/
109 //---------------------------------------------------------------------------
111 //---------------------------------------------------------------------------
113 #ifndef EPL_VETH_TX_TIMEOUT
114 //#define EPL_VETH_TX_TIMEOUT (2*HZ)
115 #define EPL_VETH_TX_TIMEOUT 0 // d.k.: we use no timeout
118 //---------------------------------------------------------------------------
120 //---------------------------------------------------------------------------
122 //---------------------------------------------------------------------------
123 // modul globale vars
124 //---------------------------------------------------------------------------
126 static struct net_device *pVEthNetDevice_g = NULL;
128 //---------------------------------------------------------------------------
129 // local function prototypes
130 //---------------------------------------------------------------------------
132 static int VEthOpen(struct net_device *pNetDevice_p);
133 static int VEthClose(struct net_device *pNetDevice_p);
134 static int VEthXmit(struct sk_buff *pSkb_p, struct net_device *pNetDevice_p);
135 static struct net_device_stats *VEthGetStats(struct net_device *pNetDevice_p);
136 static void VEthTimeout(struct net_device *pNetDevice_p);
137 static tEplKernel VEthRecvFrame(tEplFrameInfo * pFrameInfo_p);
139 //=========================================================================//
141 // P U B L I C F U N C T I O N S //
143 //=========================================================================//
145 //---------------------------------------------------------------------------
161 //---------------------------------------------------------------------------
163 static int VEthOpen(struct net_device *pNetDevice_p)
165 tEplKernel Ret = kEplSuccessful;
168 // struct net_device_stats* pStats = netdev_priv(pNetDevice_p);
170 //start the interface queue for the network subsystem
171 netif_start_queue(pNetDevice_p);
173 // register callback function in DLL
174 Ret = EplDllkRegAsyncHandler(VEthRecvFrame);
176 EPL_DBGLVL_VETH_TRACE1
177 ("VEthOpen: EplDllkRegAsyncHandler returned 0x%02X\n", Ret);
182 static int VEthClose(struct net_device *pNetDevice_p)
184 tEplKernel Ret = kEplSuccessful;
186 EPL_DBGLVL_VETH_TRACE0("VEthClose\n");
188 Ret = EplDllkDeregAsyncHandler(VEthRecvFrame);
190 //stop the interface queue for the network subsystem
191 netif_stop_queue(pNetDevice_p);
195 static int VEthXmit(struct sk_buff *pSkb_p, struct net_device *pNetDevice_p)
197 tEplKernel Ret = kEplSuccessful;
198 tEplFrameInfo FrameInfo;
201 struct net_device_stats *pStats = netdev_priv(pNetDevice_p);
204 pNetDevice_p->trans_start = jiffies;
206 FrameInfo.m_pFrame = (tEplFrame *) pSkb_p->data;
207 FrameInfo.m_uiFrameSize = pSkb_p->len;
209 //call send fkt on DLL
210 Ret = EplDllkCalAsyncSend(&FrameInfo, kEplDllAsyncReqPrioGeneric);
211 if (Ret != kEplSuccessful) {
212 EPL_DBGLVL_VETH_TRACE1
213 ("VEthXmit: EplDllkCalAsyncSend returned 0x%02X\n", Ret);
214 netif_stop_queue(pNetDevice_p);
217 EPL_DBGLVL_VETH_TRACE0("VEthXmit: frame passed to DLL\n");
218 dev_kfree_skb(pSkb_p);
220 //set stats for the device
221 pStats->tx_packets++;
222 pStats->tx_bytes += FrameInfo.m_uiFrameSize;
230 static struct net_device_stats *VEthGetStats(struct net_device *pNetDevice_p)
232 EPL_DBGLVL_VETH_TRACE0("VEthGetStats\n");
234 return netdev_priv(pNetDevice_p);
237 static void VEthTimeout(struct net_device *pNetDevice_p)
239 EPL_DBGLVL_VETH_TRACE0("VEthTimeout(\n");
241 // $$$ d.k.: move to extra function, which is called by DLL when new space is available in TxFifo
242 if (netif_queue_stopped(pNetDevice_p)) {
243 netif_wake_queue(pNetDevice_p);
247 static tEplKernel VEthRecvFrame(tEplFrameInfo * pFrameInfo_p)
249 tEplKernel Ret = kEplSuccessful;
250 struct net_device *pNetDevice = pVEthNetDevice_g;
251 struct net_device_stats *pStats = netdev_priv(pNetDevice);
252 struct sk_buff *pSkb;
254 EPL_DBGLVL_VETH_TRACE1("VEthRecvFrame: FrameSize=%u\n",
255 pFrameInfo_p->m_uiFrameSize);
257 pSkb = dev_alloc_skb(pFrameInfo_p->m_uiFrameSize + 2);
259 pStats->rx_dropped++;
262 pSkb->dev = pNetDevice;
264 skb_reserve(pSkb, 2);
266 memcpy((void *)skb_put(pSkb, pFrameInfo_p->m_uiFrameSize),
267 pFrameInfo_p->m_pFrame, pFrameInfo_p->m_uiFrameSize);
269 pSkb->protocol = eth_type_trans(pSkb, pNetDevice);
270 pSkb->ip_summed = CHECKSUM_UNNECESSARY;
272 // call netif_rx with skb
275 EPL_DBGLVL_VETH_TRACE1("VEthRecvFrame: SrcMAC=0x%llx\n",
276 AmiGetQword48FromBe(pFrameInfo_p->m_pFrame->
279 // update receive statistics
280 pStats->rx_packets++;
281 pStats->rx_bytes += pFrameInfo_p->m_uiFrameSize;
287 static const struct net_device_ops epl_netdev_ops = {
288 .ndo_open = VEthOpen,
289 .ndo_stop = VEthClose,
290 .ndo_get_stats = VEthGetStats,
291 .ndo_start_xmit = VEthXmit,
292 .ndo_tx_timeout = VEthTimeout,
293 .ndo_change_mtu = eth_change_mtu,
294 .ndo_set_mac_address = eth_mac_addr,
295 .ndo_validate_addr = eth_validate_addr,
298 tEplKernel VEthAddInstance(tEplDllkInitParam *pInitParam_p)
300 tEplKernel Ret = kEplSuccessful;
302 // allocate net device structure with priv pointing to stats structure
304 alloc_netdev(sizeof(struct net_device_stats), EPL_VETH_NAME,
306 // pVEthNetDevice_g = alloc_etherdev(sizeof (struct net_device_stats));
308 if (pVEthNetDevice_g == NULL) {
309 Ret = kEplNoResource;
313 pVEthNetDevice_g->netdev_ops = &epl_netdev_ops;
314 pVEthNetDevice_g->watchdog_timeo = EPL_VETH_TX_TIMEOUT;
315 pVEthNetDevice_g->destructor = free_netdev;
317 // copy own MAC address to net device structure
318 memcpy(pVEthNetDevice_g->dev_addr, pInitParam_p->m_be_abSrcMac, 6);
320 //register VEth to the network subsystem
321 if (register_netdev(pVEthNetDevice_g)) {
322 EPL_DBGLVL_VETH_TRACE0
323 ("VEthAddInstance: Could not register VEth...\n");
325 EPL_DBGLVL_VETH_TRACE0
326 ("VEthAddInstance: Register VEth successfull...\n");
333 tEplKernel VEthDelInstance(void)
335 tEplKernel Ret = kEplSuccessful;
337 if (pVEthNetDevice_g != NULL) {
338 //unregister VEth from the network subsystem
339 unregister_netdev(pVEthNetDevice_g);
340 // destructor was set to free_netdev,
341 // so we do not need to call free_netdev here
342 pVEthNetDevice_g = NULL;
348 #endif // (((EPL_MODULE_INTEGRATION) & (EPL_MODULE_VETH)) != 0)