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ebpf: move CONFIG_BPF_SYSCALL-only function declarations
[deliverable/linux.git] / drivers / net / arcnet / arcnet.c
1 /*
2 * Linux ARCnet driver - device-independent routines
3 *
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright was as follows:
15 *
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
21 *
22 * **********************
23 *
24 * The change log is now in a file called ChangeLog in this directory.
25 *
26 * Sources:
27 * - Crynwr arcnet.com/arcether.com packet drivers.
28 * - arcnet.c v0.00 dated 1/1/94 and apparently by
29 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
41 * <jojo@repas.de>
42 */
43
44 #define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
45
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/delay.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_arp.h>
51 #include <net/arp.h>
52 #include <linux/init.h>
53 #include <linux/arcdevice.h>
54 #include <linux/jiffies.h>
55
56 /* "do nothing" functions for protocol drivers */
57 static void null_rx(struct net_device *dev, int bufnum,
58 struct archdr *pkthdr, int length);
59 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
60 unsigned short type, uint8_t daddr);
61 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
62 int length, int bufnum);
63
64 static void arcnet_rx(struct net_device *dev, int bufnum);
65
66 /*
67 * one ArcProto per possible proto ID. None of the elements of
68 * arc_proto_map are allowed to be NULL; they will get set to
69 * arc_proto_default instead. It also must not be NULL; if you would like
70 * to set it to NULL, set it to &arc_proto_null instead.
71 */
72 struct ArcProto *arc_proto_map[256], *arc_proto_default,
73 *arc_bcast_proto, *arc_raw_proto;
74
75 static struct ArcProto arc_proto_null =
76 {
77 .suffix = '?',
78 .mtu = XMTU,
79 .is_ip = 0,
80 .rx = null_rx,
81 .build_header = null_build_header,
82 .prepare_tx = null_prepare_tx,
83 .continue_tx = NULL,
84 .ack_tx = NULL
85 };
86
87 /* Exported function prototypes */
88 int arcnet_debug = ARCNET_DEBUG;
89
90 EXPORT_SYMBOL(arc_proto_map);
91 EXPORT_SYMBOL(arc_proto_default);
92 EXPORT_SYMBOL(arc_bcast_proto);
93 EXPORT_SYMBOL(arc_raw_proto);
94 EXPORT_SYMBOL(arcnet_unregister_proto);
95 EXPORT_SYMBOL(arcnet_debug);
96 EXPORT_SYMBOL(alloc_arcdev);
97 EXPORT_SYMBOL(arcnet_interrupt);
98 EXPORT_SYMBOL(arcnet_open);
99 EXPORT_SYMBOL(arcnet_close);
100 EXPORT_SYMBOL(arcnet_send_packet);
101 EXPORT_SYMBOL(arcnet_timeout);
102
103 /* Internal function prototypes */
104 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
105 unsigned short type, const void *daddr,
106 const void *saddr, unsigned len);
107 static int arcnet_rebuild_header(struct sk_buff *skb);
108 static int go_tx(struct net_device *dev);
109
110 static int debug = ARCNET_DEBUG;
111 module_param(debug, int, 0);
112 MODULE_LICENSE("GPL");
113
114 static int __init arcnet_init(void)
115 {
116 int count;
117
118 arcnet_debug = debug;
119
120 printk("arcnet loaded.\n");
121
122 #ifdef ALPHA_WARNING
123 BUGLVL(D_EXTRA) {
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\n"
126 "arcnet: *\n"
127 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
128 "arcnet: * me if you have any questions, comments, or bug reports.\n"
129 "arcnet: ***\n");
130 }
131 #endif
132
133 /* initialize the protocol map */
134 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
135 for (count = 0; count < 256; count++)
136 arc_proto_map[count] = arc_proto_default;
137
138 BUGLVL(D_DURING)
139 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
140 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
141 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
142 sizeof(struct archdr));
143
144 return 0;
145 }
146
147 static void __exit arcnet_exit(void)
148 {
149 }
150
151 module_init(arcnet_init);
152 module_exit(arcnet_exit);
153
154 /*
155 * Dump the contents of an sk_buff
156 */
157 #if ARCNET_DEBUG_MAX & D_SKB
158 void arcnet_dump_skb(struct net_device *dev,
159 struct sk_buff *skb, char *desc)
160 {
161 char hdr[32];
162
163 /* dump the packet */
164 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
165 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
166 16, 1, skb->data, skb->len, true);
167 }
168
169 EXPORT_SYMBOL(arcnet_dump_skb);
170 #endif
171
172
173 /*
174 * Dump the contents of an ARCnet buffer
175 */
176 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
177 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
178 char *desc, int take_arcnet_lock)
179 {
180 struct arcnet_local *lp = netdev_priv(dev);
181 int i, length;
182 unsigned long flags = 0;
183 static uint8_t buf[512];
184 char hdr[32];
185
186 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
188 if(take_arcnet_lock)
189 spin_lock_irqsave(&lp->lock, flags);
190
191 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
192 if(take_arcnet_lock)
193 spin_unlock_irqrestore(&lp->lock, flags);
194
195 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
196 length = (buf[2] ? 256 : 512);
197
198 /* dump the packet */
199 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
200 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
201 16, 1, buf, length, true);
202 }
203
204 #else
205
206 #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
207
208 #endif
209
210
211 /*
212 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
213 * are responsible for registering themselves, but the unregister routine
214 * is pretty generic so we'll do it here.
215 */
216 void arcnet_unregister_proto(struct ArcProto *proto)
217 {
218 int count;
219
220 if (arc_proto_default == proto)
221 arc_proto_default = &arc_proto_null;
222 if (arc_bcast_proto == proto)
223 arc_bcast_proto = arc_proto_default;
224 if (arc_raw_proto == proto)
225 arc_raw_proto = arc_proto_default;
226
227 for (count = 0; count < 256; count++) {
228 if (arc_proto_map[count] == proto)
229 arc_proto_map[count] = arc_proto_default;
230 }
231 }
232
233
234 /*
235 * Add a buffer to the queue. Only the interrupt handler is allowed to do
236 * this, unless interrupts are disabled.
237 *
238 * Note: we don't check for a full queue, since there aren't enough buffers
239 * to more than fill it.
240 */
241 static void release_arcbuf(struct net_device *dev, int bufnum)
242 {
243 struct arcnet_local *lp = netdev_priv(dev);
244 int i;
245
246 lp->buf_queue[lp->first_free_buf++] = bufnum;
247 lp->first_free_buf %= 5;
248
249 BUGLVL(D_DURING) {
250 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
251 bufnum);
252 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
253 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
254 BUGMSG2(D_DURING, "\n");
255 }
256 }
257
258
259 /*
260 * Get a buffer from the queue. If this returns -1, there are no buffers
261 * available.
262 */
263 static int get_arcbuf(struct net_device *dev)
264 {
265 struct arcnet_local *lp = netdev_priv(dev);
266 int buf = -1, i;
267
268 if (!atomic_dec_and_test(&lp->buf_lock)) {
269 /* already in this function */
270 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
271 lp->buf_lock.counter);
272 }
273 else { /* we can continue */
274 if (lp->next_buf >= 5)
275 lp->next_buf -= 5;
276
277 if (lp->next_buf == lp->first_free_buf)
278 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
279 else {
280 buf = lp->buf_queue[lp->next_buf++];
281 lp->next_buf %= 5;
282 }
283 }
284
285
286 BUGLVL(D_DURING) {
287 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
288 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
289 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
290 BUGMSG2(D_DURING, "\n");
291 }
292
293 atomic_inc(&lp->buf_lock);
294 return buf;
295 }
296
297
298 static int choose_mtu(void)
299 {
300 int count, mtu = 65535;
301
302 /* choose the smallest MTU of all available encaps */
303 for (count = 0; count < 256; count++) {
304 if (arc_proto_map[count] != &arc_proto_null &&
305 arc_proto_map[count]->mtu < mtu) {
306 mtu = arc_proto_map[count]->mtu;
307 }
308 }
309
310 return mtu == 65535 ? XMTU : mtu;
311 }
312
313 static const struct header_ops arcnet_header_ops = {
314 .create = arcnet_header,
315 .rebuild = arcnet_rebuild_header,
316 };
317
318 static const struct net_device_ops arcnet_netdev_ops = {
319 .ndo_open = arcnet_open,
320 .ndo_stop = arcnet_close,
321 .ndo_start_xmit = arcnet_send_packet,
322 .ndo_tx_timeout = arcnet_timeout,
323 };
324
325 /* Setup a struct device for ARCnet. */
326 static void arcdev_setup(struct net_device *dev)
327 {
328 dev->type = ARPHRD_ARCNET;
329 dev->netdev_ops = &arcnet_netdev_ops;
330 dev->header_ops = &arcnet_header_ops;
331 dev->hard_header_len = sizeof(struct archdr);
332 dev->mtu = choose_mtu();
333
334 dev->addr_len = ARCNET_ALEN;
335 dev->tx_queue_len = 100;
336 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
337 dev->watchdog_timeo = TX_TIMEOUT;
338
339 /* New-style flags. */
340 dev->flags = IFF_BROADCAST;
341
342 }
343
344 struct net_device *alloc_arcdev(const char *name)
345 {
346 struct net_device *dev;
347
348 dev = alloc_netdev(sizeof(struct arcnet_local),
349 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
350 arcdev_setup);
351 if(dev) {
352 struct arcnet_local *lp = netdev_priv(dev);
353 spin_lock_init(&lp->lock);
354 }
355
356 return dev;
357 }
358
359 /*
360 * Open/initialize the board. This is called sometime after booting when
361 * the 'ifconfig' program is run.
362 *
363 * This routine should set everything up anew at each open, even registers
364 * that "should" only need to be set once at boot, so that there is
365 * non-reboot way to recover if something goes wrong.
366 */
367 int arcnet_open(struct net_device *dev)
368 {
369 struct arcnet_local *lp = netdev_priv(dev);
370 int count, newmtu, error;
371
372 BUGMSG(D_INIT,"opened.");
373
374 if (!try_module_get(lp->hw.owner))
375 return -ENODEV;
376
377 BUGLVL(D_PROTO) {
378 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
379 arc_proto_default->suffix);
380 for (count = 0; count < 256; count++)
381 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
382 BUGMSG2(D_PROTO, "\n");
383 }
384
385
386 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
387
388 /* try to put the card in a defined state - if it fails the first
389 * time, actually reset it.
390 */
391 error = -ENODEV;
392 if (ARCRESET(0) && ARCRESET(1))
393 goto out_module_put;
394
395 newmtu = choose_mtu();
396 if (newmtu < dev->mtu)
397 dev->mtu = newmtu;
398
399 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
400
401 /* autodetect the encapsulation for each host. */
402 memset(lp->default_proto, 0, sizeof(lp->default_proto));
403
404 /* the broadcast address is special - use the 'bcast' protocol */
405 for (count = 0; count < 256; count++) {
406 if (arc_proto_map[count] == arc_bcast_proto) {
407 lp->default_proto[0] = count;
408 break;
409 }
410 }
411
412 /* initialize buffers */
413 atomic_set(&lp->buf_lock, 1);
414
415 lp->next_buf = lp->first_free_buf = 0;
416 release_arcbuf(dev, 0);
417 release_arcbuf(dev, 1);
418 release_arcbuf(dev, 2);
419 release_arcbuf(dev, 3);
420 lp->cur_tx = lp->next_tx = -1;
421 lp->cur_rx = -1;
422
423 lp->rfc1201.sequence = 1;
424
425 /* bring up the hardware driver */
426 if (lp->hw.open)
427 lp->hw.open(dev);
428
429 if (dev->dev_addr[0] == 0)
430 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
431 "for broadcasts!\n");
432 else if (dev->dev_addr[0] == 255)
433 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
434 "DOS networking programs!\n");
435
436 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
437 if (ASTATUS() & RESETflag) {
438 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
439 ACOMMAND(CFLAGScmd | RESETclear);
440 }
441
442
443 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
444 /* make sure we're ready to receive IRQ's. */
445 AINTMASK(0);
446 udelay(1); /* give it time to set the mask before
447 * we reset it again. (may not even be
448 * necessary)
449 */
450 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
451 lp->intmask = NORXflag | RECONflag;
452 AINTMASK(lp->intmask);
453 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
454
455 netif_start_queue(dev);
456
457 return 0;
458
459 out_module_put:
460 module_put(lp->hw.owner);
461 return error;
462 }
463
464
465 /* The inverse routine to arcnet_open - shuts down the card. */
466 int arcnet_close(struct net_device *dev)
467 {
468 struct arcnet_local *lp = netdev_priv(dev);
469
470 netif_stop_queue(dev);
471
472 /* flush TX and disable RX */
473 AINTMASK(0);
474 ACOMMAND(NOTXcmd); /* stop transmit */
475 ACOMMAND(NORXcmd); /* disable receive */
476 mdelay(1);
477
478 /* shut down the card */
479 lp->hw.close(dev);
480 module_put(lp->hw.owner);
481 return 0;
482 }
483
484
485 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
486 unsigned short type, const void *daddr,
487 const void *saddr, unsigned len)
488 {
489 const struct arcnet_local *lp = netdev_priv(dev);
490 uint8_t _daddr, proto_num;
491 struct ArcProto *proto;
492
493 BUGMSG(D_DURING,
494 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
495 saddr ? *(uint8_t *) saddr : -1,
496 daddr ? *(uint8_t *) daddr : -1,
497 type, type, len);
498
499 if (skb->len!=0 && len != skb->len)
500 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
501 skb->len, len);
502
503
504 /* Type is host order - ? */
505 if(type == ETH_P_ARCNET) {
506 proto = arc_raw_proto;
507 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
508 _daddr = daddr ? *(uint8_t *) daddr : 0;
509 }
510 else if (!daddr) {
511 /*
512 * if the dest addr isn't provided, we can't choose an encapsulation!
513 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
514 * real header when we do rebuild_header.
515 */
516 *(uint16_t *) skb_push(skb, 2) = type;
517 /*
518 * XXX: Why not use skb->mac_len?
519 */
520 if (skb->network_header - skb->mac_header != 2)
521 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
522 (int)(skb->network_header - skb->mac_header));
523 return -2; /* return error -- can't transmit yet! */
524 }
525 else {
526 /* otherwise, we can just add the header as usual. */
527 _daddr = *(uint8_t *) daddr;
528 proto_num = lp->default_proto[_daddr];
529 proto = arc_proto_map[proto_num];
530 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
531 proto_num, proto->suffix);
532 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
533 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
534 arc_bcast_proto->suffix);
535 proto = arc_bcast_proto;
536 }
537 }
538 return proto->build_header(skb, dev, type, _daddr);
539 }
540
541
542 /*
543 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
544 * future other address resolution) has completed on this sk_buff. We now
545 * let ARP fill in the destination field.
546 */
547 static int arcnet_rebuild_header(struct sk_buff *skb)
548 {
549 struct net_device *dev = skb->dev;
550 struct arcnet_local *lp = netdev_priv(dev);
551 int status = 0; /* default is failure */
552 unsigned short type;
553 uint8_t daddr=0;
554 struct ArcProto *proto;
555 /*
556 * XXX: Why not use skb->mac_len?
557 */
558 if (skb->network_header - skb->mac_header != 2) {
559 BUGMSG(D_NORMAL,
560 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
561 (int)(skb->network_header - skb->mac_header));
562 return 0;
563 }
564 type = *(uint16_t *) skb_pull(skb, 2);
565 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
566
567 if (type == ETH_P_IP) {
568 #ifdef CONFIG_INET
569 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
570 status = arp_find(&daddr, skb) ? 1 : 0;
571 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
572 daddr, type);
573 #endif
574 } else {
575 BUGMSG(D_NORMAL,
576 "I don't understand ethernet protocol %Xh addresses!\n", type);
577 dev->stats.tx_errors++;
578 dev->stats.tx_aborted_errors++;
579 }
580
581 /* if we couldn't resolve the address... give up. */
582 if (!status)
583 return 0;
584
585 /* add the _real_ header this time! */
586 proto = arc_proto_map[lp->default_proto[daddr]];
587 proto->build_header(skb, dev, type, daddr);
588
589 return 1; /* success */
590 }
591
592
593
594 /* Called by the kernel in order to transmit a packet. */
595 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
596 struct net_device *dev)
597 {
598 struct arcnet_local *lp = netdev_priv(dev);
599 struct archdr *pkt;
600 struct arc_rfc1201 *soft;
601 struct ArcProto *proto;
602 int txbuf;
603 unsigned long flags;
604 int freeskb, retval;
605
606 BUGMSG(D_DURING,
607 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
608 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
609
610 pkt = (struct archdr *) skb->data;
611 soft = &pkt->soft.rfc1201;
612 proto = arc_proto_map[soft->proto];
613
614 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
615 skb->len, pkt->hard.dest);
616 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
617
618 /* fits in one packet? */
619 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
620 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
621 dev_kfree_skb(skb);
622 return NETDEV_TX_OK; /* don't try again */
623 }
624
625 /* We're busy transmitting a packet... */
626 netif_stop_queue(dev);
627
628 spin_lock_irqsave(&lp->lock, flags);
629 AINTMASK(0);
630 if(lp->next_tx == -1)
631 txbuf = get_arcbuf(dev);
632 else {
633 txbuf = -1;
634 }
635 if (txbuf != -1) {
636 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
637 !proto->ack_tx) {
638 /* done right away and we don't want to acknowledge
639 the package later - forget about it now */
640 dev->stats.tx_bytes += skb->len;
641 freeskb = 1;
642 } else {
643 /* do it the 'split' way */
644 lp->outgoing.proto = proto;
645 lp->outgoing.skb = skb;
646 lp->outgoing.pkt = pkt;
647
648 freeskb = 0;
649
650 if (proto->continue_tx &&
651 proto->continue_tx(dev, txbuf)) {
652 BUGMSG(D_NORMAL,
653 "bug! continue_tx finished the first time! "
654 "(proto='%c')\n", proto->suffix);
655 }
656 }
657 retval = NETDEV_TX_OK;
658 lp->next_tx = txbuf;
659 } else {
660 retval = NETDEV_TX_BUSY;
661 freeskb = 0;
662 }
663
664 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
665 /* make sure we didn't ignore a TX IRQ while we were in here */
666 AINTMASK(0);
667
668 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
669 lp->intmask |= TXFREEflag|EXCNAKflag;
670 AINTMASK(lp->intmask);
671 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
672
673 spin_unlock_irqrestore(&lp->lock, flags);
674 if (freeskb) {
675 dev_kfree_skb(skb);
676 }
677 return retval; /* no need to try again */
678 }
679
680
681 /*
682 * Actually start transmitting a packet that was loaded into a buffer
683 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 */
685 static int go_tx(struct net_device *dev)
686 {
687 struct arcnet_local *lp = netdev_priv(dev);
688
689 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
690 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
691
692 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 return 0;
694
695 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
696
697 lp->cur_tx = lp->next_tx;
698 lp->next_tx = -1;
699
700 /* start sending */
701 ACOMMAND(TXcmd | (lp->cur_tx << 3));
702
703 dev->stats.tx_packets++;
704 lp->lasttrans_dest = lp->lastload_dest;
705 lp->lastload_dest = 0;
706 lp->excnak_pending = 0;
707 lp->intmask |= TXFREEflag|EXCNAKflag;
708
709 return 1;
710 }
711
712
713 /* Called by the kernel when transmit times out */
714 void arcnet_timeout(struct net_device *dev)
715 {
716 unsigned long flags;
717 struct arcnet_local *lp = netdev_priv(dev);
718 int status = ASTATUS();
719 char *msg;
720
721 spin_lock_irqsave(&lp->lock, flags);
722 if (status & TXFREEflag) { /* transmit _DID_ finish */
723 msg = " - missed IRQ?";
724 } else {
725 msg = "";
726 dev->stats.tx_aborted_errors++;
727 lp->timed_out = 1;
728 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
729 }
730 dev->stats.tx_errors++;
731
732 /* make sure we didn't miss a TX or a EXC NAK IRQ */
733 AINTMASK(0);
734 lp->intmask |= TXFREEflag|EXCNAKflag;
735 AINTMASK(lp->intmask);
736
737 spin_unlock_irqrestore(&lp->lock, flags);
738
739 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
740 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
741 msg, status, lp->intmask, lp->lasttrans_dest);
742 lp->last_timeout = jiffies;
743 }
744
745 if (lp->cur_tx == -1)
746 netif_wake_queue(dev);
747 }
748
749
750 /*
751 * The typical workload of the driver: Handle the network interface
752 * interrupts. Establish which device needs attention, and call the correct
753 * chipset interrupt handler.
754 */
755 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
756 {
757 struct net_device *dev = dev_id;
758 struct arcnet_local *lp;
759 int recbuf, status, diagstatus, didsomething, boguscount;
760 int retval = IRQ_NONE;
761
762 BUGMSG(D_DURING, "\n");
763
764 BUGMSG(D_DURING, "in arcnet_interrupt\n");
765
766 lp = netdev_priv(dev);
767 BUG_ON(!lp);
768
769 spin_lock(&lp->lock);
770
771 /*
772 * RESET flag was enabled - if device is not running, we must clear it right
773 * away (but nothing else).
774 */
775 if (!netif_running(dev)) {
776 if (ASTATUS() & RESETflag)
777 ACOMMAND(CFLAGScmd | RESETclear);
778 AINTMASK(0);
779 spin_unlock(&lp->lock);
780 return retval;
781 }
782
783 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
784 ASTATUS(), lp->intmask);
785
786 boguscount = 5;
787 do {
788 status = ASTATUS();
789 diagstatus = (status >> 8) & 0xFF;
790
791 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
792 __FILE__,__LINE__,__func__,status);
793 didsomething = 0;
794
795 /*
796 * RESET flag was enabled - card is resetting and if RX is
797 * disabled, it's NOT because we just got a packet.
798 *
799 * The card is in an undefined state. Clear it out and start over.
800 */
801 if (status & RESETflag) {
802 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
803 arcnet_close(dev);
804 arcnet_open(dev);
805
806 /* get out of the interrupt handler! */
807 break;
808 }
809 /*
810 * RX is inhibited - we must have received something. Prepare to
811 * receive into the next buffer.
812 *
813 * We don't actually copy the received packet from the card until
814 * after the transmit handler runs (and possibly launches the next
815 * tx); this should improve latency slightly if we get both types
816 * of interrupts at once.
817 */
818 recbuf = -1;
819 if (status & lp->intmask & NORXflag) {
820 recbuf = lp->cur_rx;
821 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
822 recbuf, status);
823
824 lp->cur_rx = get_arcbuf(dev);
825 if (lp->cur_rx != -1) {
826 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
827 lp->cur_rx);
828 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
829 }
830 didsomething++;
831 }
832
833 if((diagstatus & EXCNAKflag)) {
834 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
835 diagstatus);
836
837 ACOMMAND(NOTXcmd); /* disable transmit */
838 lp->excnak_pending = 1;
839
840 ACOMMAND(EXCNAKclear);
841 lp->intmask &= ~(EXCNAKflag);
842 didsomething++;
843 }
844
845
846 /* a transmit finished, and we're interested in it. */
847 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
848 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
849
850 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
851
852 if (lp->cur_tx != -1 && !lp->timed_out) {
853 if(!(status & TXACKflag)) {
854 if (lp->lasttrans_dest != 0) {
855 BUGMSG(D_EXTRA,
856 "transmit was not acknowledged! "
857 "(status=%Xh, dest=%02Xh)\n",
858 status, lp->lasttrans_dest);
859 dev->stats.tx_errors++;
860 dev->stats.tx_carrier_errors++;
861 } else {
862 BUGMSG(D_DURING,
863 "broadcast was not acknowledged; that's normal "
864 "(status=%Xh, dest=%02Xh)\n",
865 status, lp->lasttrans_dest);
866 }
867 }
868
869 if (lp->outgoing.proto &&
870 lp->outgoing.proto->ack_tx) {
871 int ackstatus;
872 if(status & TXACKflag)
873 ackstatus=2;
874 else if(lp->excnak_pending)
875 ackstatus=1;
876 else
877 ackstatus=0;
878
879 lp->outgoing.proto
880 ->ack_tx(dev, ackstatus);
881 }
882 }
883 if (lp->cur_tx != -1)
884 release_arcbuf(dev, lp->cur_tx);
885
886 lp->cur_tx = -1;
887 lp->timed_out = 0;
888 didsomething++;
889
890 /* send another packet if there is one */
891 go_tx(dev);
892
893 /* continue a split packet, if any */
894 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
895 int txbuf = get_arcbuf(dev);
896 if (txbuf != -1) {
897 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
898 /* that was the last segment */
899 dev->stats.tx_bytes += lp->outgoing.skb->len;
900 if(!lp->outgoing.proto->ack_tx)
901 {
902 dev_kfree_skb_irq(lp->outgoing.skb);
903 lp->outgoing.proto = NULL;
904 }
905 }
906 lp->next_tx = txbuf;
907 }
908 }
909 /* inform upper layers of idleness, if necessary */
910 if (lp->cur_tx == -1)
911 netif_wake_queue(dev);
912 }
913 /* now process the received packet, if any */
914 if (recbuf != -1) {
915 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
916
917 arcnet_rx(dev, recbuf);
918 release_arcbuf(dev, recbuf);
919
920 didsomething++;
921 }
922 if (status & lp->intmask & RECONflag) {
923 ACOMMAND(CFLAGScmd | CONFIGclear);
924 dev->stats.tx_carrier_errors++;
925
926 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
927 status);
928 /* MYRECON bit is at bit 7 of diagstatus */
929 if(diagstatus & 0x80)
930 BUGMSG(D_RECON,"Put out that recon myself\n");
931
932 /* is the RECON info empty or old? */
933 if (!lp->first_recon || !lp->last_recon ||
934 time_after(jiffies, lp->last_recon + HZ * 10)) {
935 if (lp->network_down)
936 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
937 lp->first_recon = lp->last_recon = jiffies;
938 lp->num_recons = lp->network_down = 0;
939
940 BUGMSG(D_DURING, "recon: clearing counters.\n");
941 } else { /* add to current RECON counter */
942 lp->last_recon = jiffies;
943 lp->num_recons++;
944
945 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
946 lp->num_recons,
947 (lp->last_recon - lp->first_recon) / HZ,
948 lp->network_down);
949
950 /* if network is marked up;
951 * and first_recon and last_recon are 60+ apart;
952 * and the average no. of recons counted is
953 * > RECON_THRESHOLD/min;
954 * then print a warning message.
955 */
956 if (!lp->network_down &&
957 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
958 lp->num_recons >= RECON_THRESHOLD) {
959 lp->network_down = 1;
960 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
961 } else if (!lp->network_down &&
962 lp->last_recon - lp->first_recon > HZ * 60) {
963 /* reset counters if we've gone for over a minute. */
964 lp->first_recon = lp->last_recon;
965 lp->num_recons = 1;
966 }
967 }
968 } else if (lp->network_down &&
969 time_after(jiffies, lp->last_recon + HZ * 10)) {
970 if (lp->network_down)
971 BUGMSG(D_NORMAL, "cabling restored?\n");
972 lp->first_recon = lp->last_recon = 0;
973 lp->num_recons = lp->network_down = 0;
974
975 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
976 }
977
978 if(didsomething) {
979 retval |= IRQ_HANDLED;
980 }
981 }
982 while (--boguscount && didsomething);
983
984 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
985 ASTATUS(), boguscount);
986 BUGMSG(D_DURING, "\n");
987
988
989 AINTMASK(0);
990 udelay(1);
991 AINTMASK(lp->intmask);
992
993 spin_unlock(&lp->lock);
994 return retval;
995 }
996
997
998 /*
999 * This is a generic packet receiver that calls arcnet??_rx depending on the
1000 * protocol ID found.
1001 */
1002 static void arcnet_rx(struct net_device *dev, int bufnum)
1003 {
1004 struct arcnet_local *lp = netdev_priv(dev);
1005 struct archdr pkt;
1006 struct arc_rfc1201 *soft;
1007 int length, ofs;
1008
1009 soft = &pkt.soft.rfc1201;
1010
1011 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
1012 if (pkt.hard.offset[0]) {
1013 ofs = pkt.hard.offset[0];
1014 length = 256 - ofs;
1015 } else {
1016 ofs = pkt.hard.offset[1];
1017 length = 512 - ofs;
1018 }
1019
1020 /* get the full header, if possible */
1021 if (sizeof(pkt.soft) <= length)
1022 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1023 else {
1024 memset(&pkt.soft, 0, sizeof(pkt.soft));
1025 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1026 }
1027
1028 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1029 "(%d+4 bytes)\n",
1030 bufnum, pkt.hard.source, pkt.hard.dest, length);
1031
1032 dev->stats.rx_packets++;
1033 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
1034
1035 /* call the right receiver for the protocol */
1036 if (arc_proto_map[soft->proto]->is_ip) {
1037 BUGLVL(D_PROTO) {
1038 struct ArcProto
1039 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1040 *newp = arc_proto_map[soft->proto];
1041
1042 if (oldp != newp) {
1043 BUGMSG(D_PROTO,
1044 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1045 " (was '%c')\n", soft->proto, pkt.hard.source,
1046 newp->suffix, oldp->suffix);
1047 }
1048 }
1049
1050 /* broadcasts will always be done with the last-used encap. */
1051 lp->default_proto[0] = soft->proto;
1052
1053 /* in striking contrast, the following isn't a hack. */
1054 lp->default_proto[pkt.hard.source] = soft->proto;
1055 }
1056 /* call the protocol-specific receiver. */
1057 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1058 }
1059
1060
1061 static void null_rx(struct net_device *dev, int bufnum,
1062 struct archdr *pkthdr, int length)
1063 {
1064 BUGMSG(D_PROTO,
1065 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1066 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1067 }
1068
1069
1070 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1071 unsigned short type, uint8_t daddr)
1072 {
1073 struct arcnet_local *lp = netdev_priv(dev);
1074
1075 BUGMSG(D_PROTO,
1076 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1077 lp->default_proto[daddr]);
1078
1079 /* always fails */
1080 return 0;
1081 }
1082
1083
1084 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1085 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1086 int length, int bufnum)
1087 {
1088 struct arcnet_local *lp = netdev_priv(dev);
1089 struct arc_hardware newpkt;
1090
1091 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1092
1093 /* send a packet to myself -- will never get received, of course */
1094 newpkt.source = newpkt.dest = dev->dev_addr[0];
1095
1096 /* only one byte of actual data (and it's random) */
1097 newpkt.offset[0] = 0xFF;
1098
1099 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1100
1101 return 1; /* done */
1102 }
Linux kernel - Deliverables
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