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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/isdn/hysdn/hysdn_net.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/isdn/hysdn/hysdn_net.c')
-rw-r--r--drivers/isdn/hysdn/hysdn_net.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
new file mode 100644
index 000000000000..babec8157ae6
--- /dev/null
+++ b/drivers/isdn/hysdn/hysdn_net.c
@@ -0,0 +1,348 @@
1/* $Id: hysdn_net.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
2 *
3 * Linux driver for HYSDN cards, net (ethernet type) handling routines.
4 *
5 * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
6 * Copyright 1999 by Werner Cornelius (werner@titro.de)
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * This net module has been inspired by the skeleton driver from
12 * Donald Becker (becker@CESDIS.gsfc.nasa.gov)
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/version.h>
18#include <linux/signal.h>
19#include <linux/kernel.h>
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
22#include <linux/skbuff.h>
23#include <linux/inetdevice.h>
24
25#include "hysdn_defs.h"
26
27unsigned int hynet_enable = 0xffffffff;
28MODULE_PARM(hynet_enable, "i");
29
30/* store the actual version for log reporting */
31char *hysdn_net_revision = "$Revision: 1.8.6.4 $";
32
33#define MAX_SKB_BUFFERS 20 /* number of buffers for keeping TX-data */
34
35/****************************************************************************/
36/* structure containing the complete network data. The structure is aligned */
37/* in a way that both, the device and statistics are kept inside it. */
38/* for proper access, the device structure MUST be the first var/struct */
39/* inside the definition. */
40/****************************************************************************/
41struct net_local {
42 struct net_device netdev; /* the network device */
43 struct net_device_stats stats;
44 /* additional vars may be added here */
45 char dev_name[9]; /* our own device name */
46
47 /* Tx control lock. This protects the transmit buffer ring
48 * state along with the "tx full" state of the driver. This
49 * means all netif_queue flow control actions are protected
50 * by this lock as well.
51 */
52 spinlock_t lock;
53 struct sk_buff *skbs[MAX_SKB_BUFFERS]; /* pointers to tx-skbs */
54 int in_idx, out_idx; /* indexes to buffer ring */
55 int sk_count; /* number of buffers currently in ring */
56}; /* net_local */
57
58
59/*****************************************************/
60/* Get the current statistics for this card. */
61/* This may be called with the card open or closed ! */
62/*****************************************************/
63static struct net_device_stats *
64net_get_stats(struct net_device *dev)
65{
66 return (&((struct net_local *) dev)->stats);
67} /* net_device_stats */
68
69/*********************************************************************/
70/* Open/initialize the board. This is called (in the current kernel) */
71/* sometime after booting when the 'ifconfig' program is run. */
72/* This routine should set everything up anew at each open, even */
73/* registers that "should" only need to be set once at boot, so that */
74/* there is non-reboot way to recover if something goes wrong. */
75/*********************************************************************/
76static int
77net_open(struct net_device *dev)
78{
79 struct in_device *in_dev;
80 hysdn_card *card = dev->priv;
81 int i;
82
83 netif_start_queue(dev); /* start tx-queueing */
84
85 /* Fill in the MAC-level header (if not already set) */
86 if (!card->mac_addr[0]) {
87 for (i = 0; i < ETH_ALEN - sizeof(ulong); i++)
88 dev->dev_addr[i] = 0xfc;
89 if ((in_dev = dev->ip_ptr) != NULL) {
90 struct in_ifaddr *ifa = in_dev->ifa_list;
91 if (ifa != NULL)
92 memcpy(dev->dev_addr + (ETH_ALEN - sizeof(ulong)), &ifa->ifa_local, sizeof(ulong));
93 }
94 } else
95 memcpy(dev->dev_addr, card->mac_addr, ETH_ALEN);
96
97 return (0);
98} /* net_open */
99
100/*******************************************/
101/* flush the currently occupied tx-buffers */
102/* must only be called when device closed */
103/*******************************************/
104static void
105flush_tx_buffers(struct net_local *nl)
106{
107
108 while (nl->sk_count) {
109 dev_kfree_skb(nl->skbs[nl->out_idx++]); /* free skb */
110 if (nl->out_idx >= MAX_SKB_BUFFERS)
111 nl->out_idx = 0; /* wrap around */
112 nl->sk_count--;
113 }
114} /* flush_tx_buffers */
115
116
117/*********************************************************************/
118/* close/decativate the device. The device is not removed, but only */
119/* deactivated. */
120/*********************************************************************/
121static int
122net_close(struct net_device *dev)
123{
124
125 netif_stop_queue(dev); /* disable queueing */
126
127 flush_tx_buffers((struct net_local *) dev);
128
129 return (0); /* success */
130} /* net_close */
131
132/************************************/
133/* send a packet on this interface. */
134/* new style for kernel >= 2.3.33 */
135/************************************/
136static int
137net_send_packet(struct sk_buff *skb, struct net_device *dev)
138{
139 struct net_local *lp = (struct net_local *) dev;
140
141 spin_lock_irq(&lp->lock);
142
143 lp->skbs[lp->in_idx++] = skb; /* add to buffer list */
144 if (lp->in_idx >= MAX_SKB_BUFFERS)
145 lp->in_idx = 0; /* wrap around */
146 lp->sk_count++; /* adjust counter */
147 dev->trans_start = jiffies;
148
149 /* If we just used up the very last entry in the
150 * TX ring on this device, tell the queueing
151 * layer to send no more.
152 */
153 if (lp->sk_count >= MAX_SKB_BUFFERS)
154 netif_stop_queue(dev);
155
156 /* When the TX completion hw interrupt arrives, this
157 * is when the transmit statistics are updated.
158 */
159
160 spin_unlock_irq(&lp->lock);
161
162 if (lp->sk_count <= 3) {
163 schedule_work(&((hysdn_card *) dev->priv)->irq_queue);
164 }
165 return (0); /* success */
166} /* net_send_packet */
167
168
169
170/***********************************************************************/
171/* acknowlegde a packet send. The network layer will be informed about */
172/* completion */
173/***********************************************************************/
174void
175hysdn_tx_netack(hysdn_card * card)
176{
177 struct net_local *lp = card->netif;
178
179 if (!lp)
180 return; /* non existing device */
181
182
183 if (!lp->sk_count)
184 return; /* error condition */
185
186 lp->stats.tx_packets++;
187 lp->stats.tx_bytes += lp->skbs[lp->out_idx]->len;
188
189 dev_kfree_skb(lp->skbs[lp->out_idx++]); /* free skb */
190 if (lp->out_idx >= MAX_SKB_BUFFERS)
191 lp->out_idx = 0; /* wrap around */
192
193 if (lp->sk_count-- == MAX_SKB_BUFFERS) /* dec usage count */
194 netif_start_queue((struct net_device *) lp);
195} /* hysdn_tx_netack */
196
197/*****************************************************/
198/* we got a packet from the network, go and queue it */
199/*****************************************************/
200void
201hysdn_rx_netpkt(hysdn_card * card, uchar * buf, word len)
202{
203 struct net_local *lp = card->netif;
204 struct sk_buff *skb;
205
206 if (!lp)
207 return; /* non existing device */
208
209 lp->stats.rx_bytes += len;
210
211 skb = dev_alloc_skb(len);
212 if (skb == NULL) {
213 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
214 lp->netdev.name);
215 lp->stats.rx_dropped++;
216 return;
217 }
218 skb->dev = &lp->netdev;
219
220 /* copy the data */
221 memcpy(skb_put(skb, len), buf, len);
222
223 /* determine the used protocol */
224 skb->protocol = eth_type_trans(skb, &lp->netdev);
225
226 netif_rx(skb);
227 lp->stats.rx_packets++; /* adjust packet count */
228
229} /* hysdn_rx_netpkt */
230
231/*****************************************************/
232/* return the pointer to a network packet to be send */
233/*****************************************************/
234struct sk_buff *
235hysdn_tx_netget(hysdn_card * card)
236{
237 struct net_local *lp = card->netif;
238
239 if (!lp)
240 return (NULL); /* non existing device */
241
242 if (!lp->sk_count)
243 return (NULL); /* nothing available */
244
245 return (lp->skbs[lp->out_idx]); /* next packet to send */
246} /* hysdn_tx_netget */
247
248
249/*******************************************/
250/* init function called by register device */
251/*******************************************/
252static int
253net_init(struct net_device *dev)
254{
255 /* setup the function table */
256 dev->open = net_open;
257 dev->stop = net_close;
258 dev->hard_start_xmit = net_send_packet;
259 dev->get_stats = net_get_stats;
260
261 /* Fill in the fields of the device structure with ethernet values. */
262 ether_setup(dev);
263
264 return (0); /* success */
265} /* net_init */
266
267/*****************************************************************************/
268/* hysdn_net_create creates a new net device for the given card. If a device */
269/* already exists, it will be deleted and created a new one. The return value */
270/* 0 announces success, else a negative error code will be returned. */
271/*****************************************************************************/
272int
273hysdn_net_create(hysdn_card * card)
274{
275 struct net_device *dev;
276 int i;
277 if(!card) {
278 printk(KERN_WARNING "No card-pt in hysdn_net_create!\n");
279 return (-ENOMEM);
280 }
281 hysdn_net_release(card); /* release an existing net device */
282 if ((dev = kmalloc(sizeof(struct net_local), GFP_KERNEL)) == NULL) {
283 printk(KERN_WARNING "HYSDN: unable to allocate mem\n");
284 return (-ENOMEM);
285 }
286 memset(dev, 0, sizeof(struct net_local)); /* clean the structure */
287
288 spin_lock_init(&((struct net_local *) dev)->lock);
289
290 /* initialise necessary or informing fields */
291 dev->base_addr = card->iobase; /* IO address */
292 dev->irq = card->irq; /* irq */
293 dev->init = net_init; /* the init function of the device */
294 if(dev->name) {
295 strcpy(dev->name, ((struct net_local *) dev)->dev_name);
296 }
297 if ((i = register_netdev(dev))) {
298 printk(KERN_WARNING "HYSDN: unable to create network device\n");
299 kfree(dev);
300 return (i);
301 }
302 dev->priv = card; /* remember pointer to own data structure */
303 card->netif = dev; /* setup the local pointer */
304
305 if (card->debug_flags & LOG_NET_INIT)
306 hysdn_addlog(card, "network device created");
307 return (0); /* and return success */
308} /* hysdn_net_create */
309
310/***************************************************************************/
311/* hysdn_net_release deletes the net device for the given card. The return */
312/* value 0 announces success, else a negative error code will be returned. */
313/***************************************************************************/
314int
315hysdn_net_release(hysdn_card * card)
316{
317 struct net_device *dev = card->netif;
318
319 if (!dev)
320 return (0); /* non existing */
321
322 card->netif = NULL; /* clear out pointer */
323 dev->stop(dev); /* close the device */
324
325 flush_tx_buffers((struct net_local *) dev); /* empty buffers */
326
327 unregister_netdev(dev); /* release the device */
328 free_netdev(dev); /* release the memory allocated */
329 if (card->debug_flags & LOG_NET_INIT)
330 hysdn_addlog(card, "network device deleted");
331
332 return (0); /* always successful */
333} /* hysdn_net_release */
334
335/*****************************************************************************/
336/* hysdn_net_getname returns a pointer to the name of the network interface. */
337/* if the interface is not existing, a "-" is returned. */
338/*****************************************************************************/
339char *
340hysdn_net_getname(hysdn_card * card)
341{
342 struct net_device *dev = card->netif;
343
344 if (!dev)
345 return ("-"); /* non existing */
346
347 return (dev->name);
348} /* hysdn_net_getname */