]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
47 | struct simeth_local { | |
48 | struct net_device_stats stats; | |
49 | int simfd; /* descriptor in the simulator */ | |
50 | }; | |
51 | ||
52 | static int simeth_probe1(void); | |
53 | static int simeth_open(struct net_device *dev); | |
54 | static int simeth_close(struct net_device *dev); | |
55 | static int simeth_tx(struct sk_buff *skb, struct net_device *dev); | |
56 | static int simeth_rx(struct net_device *dev); | |
57 | static struct net_device_stats *simeth_get_stats(struct net_device *dev); | |
58 | static irqreturn_t simeth_interrupt(int irq, void *dev_id, struct pt_regs * regs); | |
59 | static void set_multicast_list(struct net_device *dev); | |
60 | static int simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr); | |
61 | ||
62 | static 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 | */ | |
79 | static char *simeth_device="eth0"; /* default host interface to use */ | |
80 | ||
81 | ||
82 | ||
83 | static volatile unsigned int card_count; /* how many cards "found" so far */ | |
84 | static int simeth_debug; /* set to 1 to get debug information */ | |
85 | ||
86 | /* | |
87 | * Used to catch IFF_UP & IFF_DOWN events | |
88 | */ | |
89 | static 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 | */ | |
100 | static int __init | |
101 | simeth_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 | ||
114 | int __init | |
115 | simeth_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 | ||
128 | extern long ia64_ssc (long, long, long, long, int); | |
129 | extern void ia64_ssc_connect_irq (long intr, long irq); | |
130 | ||
131 | static inline int | |
132 | netdev_probe(char *name, unsigned char *ether) | |
133 | { | |
134 | return ia64_ssc(__pa(name), __pa(ether), 0,0, SSC_NETDEV_PROBE); | |
135 | } | |
136 | ||
137 | ||
138 | static inline int | |
139 | netdev_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 | ||
149 | static inline int | |
150 | netdev_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 | ||
157 | static inline int | |
158 | netdev_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 | ||
165 | static inline int | |
166 | netdev_send(int fd, unsigned char *buf, unsigned int len) | |
167 | { | |
168 | return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_SEND); | |
169 | } | |
170 | ||
171 | static inline int | |
172 | netdev_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 | */ | |
188 | static int | |
189 | simeth_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 | */ | |
252 | static int | |
253 | simeth_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 */ | |
266 | static __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 | */ | |
286 | static int | |
287 | simeth_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 | ||
342 | static int | |
343 | simeth_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 | */ | |
355 | static void | |
356 | frame_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 | */ | |
382 | static int | |
383 | simeth_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 | ||
415 | static inline struct sk_buff * | |
416 | make_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 | */ | |
441 | static int | |
442 | simeth_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 | */ | |
498 | static irqreturn_t | |
499 | simeth_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 | ||
515 | static struct net_device_stats * | |
516 | simeth_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 */ | |
524 | static void | |
525 | set_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); |