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-rw-r--r--arch/ia64/hp/sim/simeth.c530
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diff --git a/arch/ia64/hp/sim/simeth.c b/arch/ia64/hp/sim/simeth.c
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1/*
2 * Simulated Ethernet Driver
3 *
4 * Copyright (C) 1999-2001, 2003 Hewlett-Packard Co
5 * Stephane Eranian <eranian@hpl.hp.com>
6 */
7#include <linux/config.h>
8#include <linux/kernel.h>
9#include <linux/sched.h>
10#include <linux/types.h>
11#include <linux/in.h>
12#include <linux/string.h>
13#include <linux/init.h>
14#include <linux/errno.h>
15#include <linux/interrupt.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
18#include <linux/inetdevice.h>
19#include <linux/if_ether.h>
20#include <linux/if_arp.h>
21#include <linux/skbuff.h>
22#include <linux/notifier.h>
23#include <linux/bitops.h>
24#include <asm/system.h>
25#include <asm/irq.h>
26
27#define SIMETH_RECV_MAX 10
28
29/*
30 * Maximum possible received frame for Ethernet.
31 * We preallocate an sk_buff of that size to avoid costly
32 * memcpy for temporary buffer into sk_buff. We do basically
33 * what's done in other drivers, like eepro with a ring.
34 * The difference is, of course, that we don't have real DMA !!!
35 */
36#define SIMETH_FRAME_SIZE ETH_FRAME_LEN
37
38
39#define SSC_NETDEV_PROBE 100
40#define SSC_NETDEV_SEND 101
41#define SSC_NETDEV_RECV 102
42#define SSC_NETDEV_ATTACH 103
43#define SSC_NETDEV_DETACH 104
44
45#define NETWORK_INTR 8
46
47struct simeth_local {
48 struct net_device_stats stats;
49 int simfd; /* descriptor in the simulator */
50};
51
52static int simeth_probe1(void);
53static int simeth_open(struct net_device *dev);
54static int simeth_close(struct net_device *dev);
55static int simeth_tx(struct sk_buff *skb, struct net_device *dev);
56static int simeth_rx(struct net_device *dev);
57static struct net_device_stats *simeth_get_stats(struct net_device *dev);
58static irqreturn_t simeth_interrupt(int irq, void *dev_id, struct pt_regs * regs);
59static void set_multicast_list(struct net_device *dev);
60static int simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr);
61
62static char *simeth_version="0.3";
63
64/*
65 * This variable is used to establish a mapping between the Linux/ia64 kernel
66 * and the host linux kernel.
67 *
68 * As of today, we support only one card, even though most of the code
69 * is ready for many more. The mapping is then:
70 * linux/ia64 -> linux/x86
71 * eth0 -> eth1
72 *
73 * In the future, we some string operations, we could easily support up
74 * to 10 cards (0-9).
75 *
76 * The default mapping can be changed on the kernel command line by
77 * specifying simeth=ethX (or whatever string you want).
78 */
79static char *simeth_device="eth0"; /* default host interface to use */
80
81
82
83static volatile unsigned int card_count; /* how many cards "found" so far */
84static int simeth_debug; /* set to 1 to get debug information */
85
86/*
87 * Used to catch IFF_UP & IFF_DOWN events
88 */
89static struct notifier_block simeth_dev_notifier = {
90 simeth_device_event,
91 0
92};
93
94
95/*
96 * Function used when using a kernel command line option.
97 *
98 * Format: simeth=interface_name (like eth0)
99 */
100static int __init
101simeth_setup(char *str)
102{
103 simeth_device = str;
104 return 1;
105}
106
107__setup("simeth=", simeth_setup);
108
109/*
110 * Function used to probe for simeth devices when not installed
111 * as a loadable module
112 */
113
114int __init
115simeth_probe (void)
116{
117 int r;
118
119 printk(KERN_INFO "simeth: v%s\n", simeth_version);
120
121 r = simeth_probe1();
122
123 if (r == 0) register_netdevice_notifier(&simeth_dev_notifier);
124
125 return r;
126}
127
128extern long ia64_ssc (long, long, long, long, int);
129extern void ia64_ssc_connect_irq (long intr, long irq);
130
131static inline int
132netdev_probe(char *name, unsigned char *ether)
133{
134 return ia64_ssc(__pa(name), __pa(ether), 0,0, SSC_NETDEV_PROBE);
135}
136
137
138static inline int
139netdev_connect(int irq)
140{
141 /* XXX Fix me
142 * this does not support multiple cards
143 * also no return value
144 */
145 ia64_ssc_connect_irq(NETWORK_INTR, irq);
146 return 0;
147}
148
149static inline int
150netdev_attach(int fd, int irq, unsigned int ipaddr)
151{
152 /* this puts the host interface in the right mode (start interrupting) */
153 return ia64_ssc(fd, ipaddr, 0,0, SSC_NETDEV_ATTACH);
154}
155
156
157static inline int
158netdev_detach(int fd)
159{
160 /*
161 * inactivate the host interface (don't interrupt anymore) */
162 return ia64_ssc(fd, 0,0,0, SSC_NETDEV_DETACH);
163}
164
165static inline int
166netdev_send(int fd, unsigned char *buf, unsigned int len)
167{
168 return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_SEND);
169}
170
171static inline int
172netdev_read(int fd, unsigned char *buf, unsigned int len)
173{
174 return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_RECV);
175}
176
177/*
178 * Function shared with module code, so cannot be in init section
179 *
180 * So far this function "detects" only one card (test_&_set) but could
181 * be extended easily.
182 *
183 * Return:
184 * - -ENODEV is no device found
185 * - -ENOMEM is no more memory
186 * - 0 otherwise
187 */
188static int
189simeth_probe1(void)
190{
191 unsigned char mac_addr[ETH_ALEN];
192 struct simeth_local *local;
193 struct net_device *dev;
194 int fd, i, err;
195
196 /*
197 * XXX Fix me
198 * let's support just one card for now
199 */
200 if (test_and_set_bit(0, &card_count))
201 return -ENODEV;
202
203 /*
204 * check with the simulator for the device
205 */
206 fd = netdev_probe(simeth_device, mac_addr);
207 if (fd == -1)
208 return -ENODEV;
209
210 dev = alloc_etherdev(sizeof(struct simeth_local));
211 if (!dev)
212 return -ENOMEM;
213
214 memcpy(dev->dev_addr, mac_addr, sizeof(mac_addr));
215
216 local = dev->priv;
217 local->simfd = fd; /* keep track of underlying file descriptor */
218
219 dev->open = simeth_open;
220 dev->stop = simeth_close;
221 dev->hard_start_xmit = simeth_tx;
222 dev->get_stats = simeth_get_stats;
223 dev->set_multicast_list = set_multicast_list; /* no yet used */
224
225 err = register_netdev(dev);
226 if (err) {
227 free_netdev(dev);
228 return err;
229 }
230
231 dev->irq = assign_irq_vector(AUTO_ASSIGN);
232
233 /*
234 * attach the interrupt in the simulator, this does enable interrupts
235 * until a netdev_attach() is called
236 */
237 netdev_connect(dev->irq);
238
239 printk(KERN_INFO "%s: hosteth=%s simfd=%d, HwAddr",
240 dev->name, simeth_device, local->simfd);
241 for(i = 0; i < ETH_ALEN; i++) {
242 printk(" %2.2x", dev->dev_addr[i]);
243 }
244 printk(", IRQ %d\n", dev->irq);
245
246 return 0;
247}
248
249/*
250 * actually binds the device to an interrupt vector
251 */
252static int
253simeth_open(struct net_device *dev)
254{
255 if (request_irq(dev->irq, simeth_interrupt, 0, "simeth", dev)) {
256 printk(KERN_WARNING "simeth: unable to get IRQ %d.\n", dev->irq);
257 return -EAGAIN;
258 }
259
260 netif_start_queue(dev);
261
262 return 0;
263}
264
265/* copied from lapbether.c */
266static __inline__ int dev_is_ethdev(struct net_device *dev)
267{
268 return ( dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5));
269}
270
271
272/*
273 * Handler for IFF_UP or IFF_DOWN
274 *
275 * The reason for that is that we don't want to be interrupted when the
276 * interface is down. There is no way to unconnect in the simualtor. Instead
277 * we use this function to shutdown packet processing in the frame filter
278 * in the simulator. Thus no interrupts are generated
279 *
280 *
281 * That's also the place where we pass the IP address of this device to the
282 * simulator so that that we can start filtering packets for it
283 *
284 * There may be a better way of doing this, but I don't know which yet.
285 */
286static int
287simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr)
288{
289 struct net_device *dev = ptr;
290 struct simeth_local *local;
291 struct in_device *in_dev;
292 struct in_ifaddr **ifap = NULL;
293 struct in_ifaddr *ifa = NULL;
294 int r;
295
296
297 if ( ! dev ) {
298 printk(KERN_WARNING "simeth_device_event dev=0\n");
299 return NOTIFY_DONE;
300 }
301
302 if ( event != NETDEV_UP && event != NETDEV_DOWN ) return NOTIFY_DONE;
303
304 /*
305 * Check whether or not it's for an ethernet device
306 *
307 * XXX Fixme: This works only as long as we support one
308 * type of ethernet device.
309 */
310 if ( !dev_is_ethdev(dev) ) return NOTIFY_DONE;
311
312 if ((in_dev=dev->ip_ptr) != NULL) {
313 for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next)
314 if (strcmp(dev->name, ifa->ifa_label) == 0) break;
315 }
316 if ( ifa == NULL ) {
317 printk(KERN_ERR "simeth_open: can't find device %s's ifa\n", dev->name);
318 return NOTIFY_DONE;
319 }
320
321 printk(KERN_INFO "simeth_device_event: %s ipaddr=0x%x\n",
322 dev->name, htonl(ifa->ifa_local));
323
324 /*
325 * XXX Fix me
326 * if the device was up, and we're simply reconfiguring it, not sure
327 * we get DOWN then UP.
328 */
329
330 local = dev->priv;
331 /* now do it for real */
332 r = event == NETDEV_UP ?
333 netdev_attach(local->simfd, dev->irq, htonl(ifa->ifa_local)):
334 netdev_detach(local->simfd);
335
336 printk(KERN_INFO "simeth: netdev_attach/detach: event=%s ->%d\n",
337 event == NETDEV_UP ? "attach":"detach", r);
338
339 return NOTIFY_DONE;
340}
341
342static int
343simeth_close(struct net_device *dev)
344{
345 netif_stop_queue(dev);
346
347 free_irq(dev->irq, dev);
348
349 return 0;
350}
351
352/*
353 * Only used for debug
354 */
355static void
356frame_print(unsigned char *from, unsigned char *frame, int len)
357{
358 int i;
359
360 printk("%s: (%d) %02x", from, len, frame[0] & 0xff);
361 for(i=1; i < 6; i++ ) {
362 printk(":%02x", frame[i] &0xff);
363 }
364 printk(" %2x", frame[6] &0xff);
365 for(i=7; i < 12; i++ ) {
366 printk(":%02x", frame[i] &0xff);
367 }
368 printk(" [%02x%02x]\n", frame[12], frame[13]);
369
370 for(i=14; i < len; i++ ) {
371 printk("%02x ", frame[i] &0xff);
372 if ( (i%10)==0) printk("\n");
373 }
374 printk("\n");
375}
376
377
378/*
379 * Function used to transmit of frame, very last one on the path before
380 * going to the simulator.
381 */
382static int
383simeth_tx(struct sk_buff *skb, struct net_device *dev)
384{
385 struct simeth_local *local = dev->priv;
386
387#if 0
388 /* ensure we have at least ETH_ZLEN bytes (min frame size) */
389 unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
390 /* Where do the extra padding bytes comes from inthe skbuff ? */
391#else
392 /* the real driver in the host system is going to take care of that
393 * or maybe it's the NIC itself.
394 */
395 unsigned int length = skb->len;
396#endif
397
398 local->stats.tx_bytes += skb->len;
399 local->stats.tx_packets++;
400
401
402 if (simeth_debug > 5) frame_print("simeth_tx", skb->data, length);
403
404 netdev_send(local->simfd, skb->data, length);
405
406 /*
407 * we are synchronous on write, so we don't simulate a
408 * trasnmit complete interrupt, thus we don't need to arm a tx
409 */
410
411 dev_kfree_skb(skb);
412 return 0;
413}
414
415static inline struct sk_buff *
416make_new_skb(struct net_device *dev)
417{
418 struct sk_buff *nskb;
419
420 /*
421 * The +2 is used to make sure that the IP header is nicely
422 * aligned (on 4byte boundary I assume 14+2=16)
423 */
424 nskb = dev_alloc_skb(SIMETH_FRAME_SIZE + 2);
425 if ( nskb == NULL ) {
426 printk(KERN_NOTICE "%s: memory squeeze. dropping packet.\n", dev->name);
427 return NULL;
428 }
429 nskb->dev = dev;
430
431 skb_reserve(nskb, 2); /* Align IP on 16 byte boundaries */
432
433 skb_put(nskb,SIMETH_FRAME_SIZE);
434
435 return nskb;
436}
437
438/*
439 * called from interrupt handler to process a received frame
440 */
441static int
442simeth_rx(struct net_device *dev)
443{
444 struct simeth_local *local;
445 struct sk_buff *skb;
446 int len;
447 int rcv_count = SIMETH_RECV_MAX;
448
449 local = dev->priv;
450 /*
451 * the loop concept has been borrowed from other drivers
452 * looks to me like it's a throttling thing to avoid pushing to many
453 * packets at one time into the stack. Making sure we can process them
454 * upstream and make forward progress overall
455 */
456 do {
457 if ( (skb=make_new_skb(dev)) == NULL ) {
458 printk(KERN_NOTICE "%s: memory squeeze. dropping packet.\n", dev->name);
459 local->stats.rx_dropped++;
460 return 0;
461 }
462 /*
463 * Read only one frame at a time
464 */
465 len = netdev_read(local->simfd, skb->data, SIMETH_FRAME_SIZE);
466 if ( len == 0 ) {
467 if ( simeth_debug > 0 ) printk(KERN_WARNING "%s: count=%d netdev_read=0\n",
468 dev->name, SIMETH_RECV_MAX-rcv_count);
469 break;
470 }
471#if 0
472 /*
473 * XXX Fix me
474 * Should really do a csum+copy here
475 */
476 memcpy(skb->data, frame, len);
477#endif
478 skb->protocol = eth_type_trans(skb, dev);
479
480 if ( simeth_debug > 6 ) frame_print("simeth_rx", skb->data, len);
481
482 /*
483 * push the packet up & trigger software interrupt
484 */
485 netif_rx(skb);
486
487 local->stats.rx_packets++;
488 local->stats.rx_bytes += len;
489
490 } while ( --rcv_count );
491
492 return len; /* 0 = nothing left to read, otherwise, we can try again */
493}
494
495/*
496 * Interrupt handler (Yes, we can do it too !!!)
497 */
498static irqreturn_t
499simeth_interrupt(int irq, void *dev_id, struct pt_regs * regs)
500{
501 struct net_device *dev = dev_id;
502
503 if ( dev == NULL ) {
504 printk(KERN_WARNING "simeth: irq %d for unknown device\n", irq);
505 return IRQ_NONE;
506 }
507
508 /*
509 * very simple loop because we get interrupts only when receiving
510 */
511 while (simeth_rx(dev));
512 return IRQ_HANDLED;
513}
514
515static struct net_device_stats *
516simeth_get_stats(struct net_device *dev)
517{
518 struct simeth_local *local = dev->priv;
519
520 return &local->stats;
521}
522
523/* fake multicast ability */
524static void
525set_multicast_list(struct net_device *dev)
526{
527 printk(KERN_WARNING "%s: set_multicast_list called\n", dev->name);
528}
529
530__initcall(simeth_probe);