2 * Linux ARCnet driver - device-independent routines
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.
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
12 * **********************
14 * The original copyright was as follows:
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.
22 * **********************
24 * The change log is now in a file called ChangeLog in this directory.
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
44 #define VERSION "arcnet: v3.93 BETA 2000/04/29 - by Avery Pennarun et al.\n"
46 #include <linux/module.h>
47 #include <linux/config.h>
48 #include <linux/types.h>
49 #include <linux/delay.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_arp.h>
53 #include <linux/init.h>
54 #include <linux/arcdevice.h>
55 #include <linux/jiffies.h>
57 /* "do nothing" functions for protocol drivers */
58 static void null_rx(struct net_device *dev, int bufnum,
59 struct archdr *pkthdr, int length);
60 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
61 unsigned short type, uint8_t daddr);
62 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
63 int length, int bufnum);
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.
72 struct ArcProto *arc_proto_map[256], *arc_proto_default,
73 *arc_bcast_proto, *arc_raw_proto;
75 struct ArcProto arc_proto_null =
81 .build_header = null_build_header,
82 .prepare_tx = null_prepare_tx,
87 /* Exported function prototypes */
88 int arcnet_debug = ARCNET_DEBUG;
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(arc_proto_null);
95 EXPORT_SYMBOL(arcnet_unregister_proto);
96 EXPORT_SYMBOL(arcnet_debug);
97 EXPORT_SYMBOL(alloc_arcdev);
98 EXPORT_SYMBOL(arcnet_interrupt);
100 /* Internal function prototypes */
101 static int arcnet_open(struct net_device *dev);
102 static int arcnet_close(struct net_device *dev);
103 static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
104 static void arcnet_timeout(struct net_device *dev);
105 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
106 unsigned short type, void *daddr, void *saddr,
108 static int arcnet_rebuild_header(struct sk_buff *skb);
109 static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
110 static int go_tx(struct net_device *dev);
112 static int debug = ARCNET_DEBUG;
113 module_param(debug, int, 0);
114 MODULE_LICENSE("GPL");
116 static int __init arcnet_init(void)
120 arcnet_debug = debug;
126 printk("arcnet: ***\n"
127 "arcnet: * Read arcnet.txt for important release notes!\n"
129 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
130 "arcnet: * me if you have any questions, comments, or bug reports.\n"
135 /* initialize the protocol map */
136 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
137 for (count = 0; count < 256; count++)
138 arc_proto_map[count] = arc_proto_default;
141 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
142 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
143 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
144 sizeof(struct archdr));
149 static void __exit arcnet_exit(void)
153 module_init(arcnet_init);
154 module_exit(arcnet_exit);
157 * Dump the contents of an sk_buff
159 #if ARCNET_DEBUG_MAX & D_SKB
160 void arcnet_dump_skb(struct net_device *dev,
161 struct sk_buff *skb, char *desc)
165 printk(KERN_DEBUG "%6s: skb dump (%s) follows:", dev->name, desc);
166 for (i = 0; i < skb->len; i++) {
168 printk("\n" KERN_DEBUG "[%04X] ", i);
169 printk("%02X ", ((u_char *) skb->data)[i]);
174 EXPORT_SYMBOL(arcnet_dump_skb);
179 * Dump the contents of an ARCnet buffer
181 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
182 void arcnet_dump_packet(struct net_device *dev, int bufnum, char *desc,
183 int take_arcnet_lock)
185 struct arcnet_local *lp = dev->priv;
187 unsigned long flags = 0;
188 static uint8_t buf[512];
190 /* hw.copy_from_card expects IRQ context so take the IRQ lock
191 to keep it single threaded */
193 spin_lock_irqsave(&lp->lock, flags);
195 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
197 spin_unlock_irqrestore(&lp->lock, flags);
199 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
200 length = (buf[2] ? 256 : 512);
202 printk(KERN_DEBUG "%6s: packet dump (%s) follows:", dev->name, desc);
203 for (i = 0; i < length; i++) {
205 printk("\n" KERN_DEBUG "[%04X] ", i);
206 printk("%02X ", buf[i]);
212 EXPORT_SYMBOL(arcnet_dump_packet);
217 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
218 * are responsible for registering themselves, but the unregister routine
219 * is pretty generic so we'll do it here.
221 void arcnet_unregister_proto(struct ArcProto *proto)
225 if (arc_proto_default == proto)
226 arc_proto_default = &arc_proto_null;
227 if (arc_bcast_proto == proto)
228 arc_bcast_proto = arc_proto_default;
229 if (arc_raw_proto == proto)
230 arc_raw_proto = arc_proto_default;
232 for (count = 0; count < 256; count++) {
233 if (arc_proto_map[count] == proto)
234 arc_proto_map[count] = arc_proto_default;
240 * Add a buffer to the queue. Only the interrupt handler is allowed to do
241 * this, unless interrupts are disabled.
243 * Note: we don't check for a full queue, since there aren't enough buffers
244 * to more than fill it.
246 static void release_arcbuf(struct net_device *dev, int bufnum)
248 struct arcnet_local *lp = dev->priv;
251 lp->buf_queue[lp->first_free_buf++] = bufnum;
252 lp->first_free_buf %= 5;
255 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
257 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
258 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
259 BUGMSG2(D_DURING, "\n");
265 * Get a buffer from the queue. If this returns -1, there are no buffers
268 static int get_arcbuf(struct net_device *dev)
270 struct arcnet_local *lp = dev->priv;
273 if (!atomic_dec_and_test(&lp->buf_lock)) {
274 /* already in this function */
275 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
276 lp->buf_lock.counter);
278 else { /* we can continue */
279 if (lp->next_buf >= 5)
282 if (lp->next_buf == lp->first_free_buf)
283 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
285 buf = lp->buf_queue[lp->next_buf++];
292 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
293 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
294 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
295 BUGMSG2(D_DURING, "\n");
298 atomic_inc(&lp->buf_lock);
303 static int choose_mtu(void)
305 int count, mtu = 65535;
307 /* choose the smallest MTU of all available encaps */
308 for (count = 0; count < 256; count++) {
309 if (arc_proto_map[count] != &arc_proto_null
310 && arc_proto_map[count]->mtu < mtu) {
311 mtu = arc_proto_map[count]->mtu;
315 return mtu == 65535 ? XMTU : mtu;
319 /* Setup a struct device for ARCnet. */
320 static void arcdev_setup(struct net_device *dev)
322 dev->type = ARPHRD_ARCNET;
323 dev->hard_header_len = sizeof(struct archdr);
324 dev->mtu = choose_mtu();
326 dev->addr_len = ARCNET_ALEN;
327 dev->tx_queue_len = 100;
328 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
329 dev->watchdog_timeo = TX_TIMEOUT;
331 /* New-style flags. */
332 dev->flags = IFF_BROADCAST;
335 * Put in this stuff here, so we don't have to export the symbols to
336 * the chipset drivers.
338 dev->open = arcnet_open;
339 dev->stop = arcnet_close;
340 dev->hard_start_xmit = arcnet_send_packet;
341 dev->tx_timeout = arcnet_timeout;
342 dev->get_stats = arcnet_get_stats;
343 dev->hard_header = arcnet_header;
344 dev->rebuild_header = arcnet_rebuild_header;
347 struct net_device *alloc_arcdev(char *name)
349 struct net_device *dev;
351 dev = alloc_netdev(sizeof(struct arcnet_local),
352 name && *name ? name : "arc%d", arcdev_setup);
354 struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
355 spin_lock_init(&lp->lock);
362 * Open/initialize the board. This is called sometime after booting when
363 * the 'ifconfig' program is run.
365 * This routine should set everything up anew at each open, even registers
366 * that "should" only need to be set once at boot, so that there is
367 * non-reboot way to recover if something goes wrong.
369 static int arcnet_open(struct net_device *dev)
371 struct arcnet_local *lp = dev->priv;
372 int count, newmtu, error;
374 BUGMSG(D_INIT,"opened.");
376 if (!try_module_get(lp->hw.owner))
381 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
382 arc_proto_default->suffix);
383 for (count = 0; count < 256; count++)
384 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
385 BUGMSG2(D_PROTO, "\n");
389 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
391 /* try to put the card in a defined state - if it fails the first
392 * time, actually reset it.
395 if (ARCRESET(0) && ARCRESET(1))
398 newmtu = choose_mtu();
399 if (newmtu < dev->mtu)
402 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
404 /* autodetect the encapsulation for each host. */
405 memset(lp->default_proto, 0, sizeof(lp->default_proto));
407 /* the broadcast address is special - use the 'bcast' protocol */
408 for (count = 0; count < 256; count++) {
409 if (arc_proto_map[count] == arc_bcast_proto) {
410 lp->default_proto[0] = count;
415 /* initialize buffers */
416 atomic_set(&lp->buf_lock, 1);
418 lp->next_buf = lp->first_free_buf = 0;
419 release_arcbuf(dev, 0);
420 release_arcbuf(dev, 1);
421 release_arcbuf(dev, 2);
422 release_arcbuf(dev, 3);
423 lp->cur_tx = lp->next_tx = -1;
426 lp->rfc1201.sequence = 1;
428 /* bring up the hardware driver */
432 if (dev->dev_addr[0] == 0)
433 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
434 "for broadcasts!\n");
435 else if (dev->dev_addr[0] == 255)
436 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
437 "DOS networking programs!\n");
439 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
440 if (ASTATUS() & RESETflag) {
441 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
442 ACOMMAND(CFLAGScmd | RESETclear);
446 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
447 /* make sure we're ready to receive IRQ's. */
449 udelay(1); /* give it time to set the mask before
450 * we reset it again. (may not even be
453 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
454 lp->intmask = NORXflag | RECONflag;
455 AINTMASK(lp->intmask);
456 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
458 netif_start_queue(dev);
463 module_put(lp->hw.owner);
468 /* The inverse routine to arcnet_open - shuts down the card. */
469 static int arcnet_close(struct net_device *dev)
471 struct arcnet_local *lp = dev->priv;
473 netif_stop_queue(dev);
475 /* flush TX and disable RX */
477 ACOMMAND(NOTXcmd); /* stop transmit */
478 ACOMMAND(NORXcmd); /* disable receive */
481 /* shut down the card */
483 module_put(lp->hw.owner);
488 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
489 unsigned short type, void *daddr, void *saddr,
492 struct arcnet_local *lp = dev->priv;
493 uint8_t _daddr, proto_num;
494 struct ArcProto *proto;
497 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
498 saddr ? *(uint8_t *) saddr : -1,
499 daddr ? *(uint8_t *) daddr : -1,
502 if (skb->len!=0 && len != skb->len)
503 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
507 /* Type is host order - ? */
508 if(type == ETH_P_ARCNET) {
509 proto = arc_raw_proto;
510 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
511 _daddr = daddr ? *(uint8_t *) daddr : 0;
515 * if the dest addr isn't provided, we can't choose an encapsulation!
516 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
517 * real header when we do rebuild_header.
519 *(uint16_t *) skb_push(skb, 2) = type;
520 if (skb->nh.raw - skb->mac.raw != 2)
521 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
522 (int)(skb->nh.raw - skb->mac.raw));
523 return -2; /* return error -- can't transmit yet! */
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;
538 return proto->build_header(skb, dev, type, _daddr);
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.
547 static int arcnet_rebuild_header(struct sk_buff *skb)
549 struct net_device *dev = skb->dev;
550 struct arcnet_local *lp = dev->priv;
551 int status = 0; /* default is failure */
554 struct ArcProto *proto;
556 if (skb->nh.raw - skb->mac.raw != 2) {
558 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
559 (int)(skb->nh.raw - skb->mac.raw));
562 type = *(uint16_t *) skb_pull(skb, 2);
563 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
565 if (type == ETH_P_IP) {
567 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
568 status = arp_find(&daddr, skb) ? 1 : 0;
569 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
574 "I don't understand ethernet protocol %Xh addresses!\n", type);
575 lp->stats.tx_errors++;
576 lp->stats.tx_aborted_errors++;
579 /* if we couldn't resolve the address... give up. */
583 /* add the _real_ header this time! */
584 proto = arc_proto_map[lp->default_proto[daddr]];
585 proto->build_header(skb, dev, type, daddr);
587 return 1; /* success */
592 /* Called by the kernel in order to transmit a packet. */
593 static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev)
595 struct arcnet_local *lp = dev->priv;
597 struct arc_rfc1201 *soft;
598 struct ArcProto *proto;
604 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
605 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
607 pkt = (struct archdr *) skb->data;
608 soft = &pkt->soft.rfc1201;
609 proto = arc_proto_map[soft->proto];
611 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
612 skb->len, pkt->hard.dest);
613 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
615 /* fits in one packet? */
616 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
617 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
619 return NETDEV_TX_OK; /* don't try again */
622 /* We're busy transmitting a packet... */
623 netif_stop_queue(dev);
625 spin_lock_irqsave(&lp->lock, flags);
627 if(lp->next_tx == -1)
628 txbuf = get_arcbuf(dev);
633 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
635 /* done right away and we don't want to acknowledge
636 the package later - forget about it now */
637 lp->stats.tx_bytes += skb->len;
640 /* do it the 'split' way */
641 lp->outgoing.proto = proto;
642 lp->outgoing.skb = skb;
643 lp->outgoing.pkt = pkt;
647 if (proto->continue_tx &&
648 proto->continue_tx(dev, txbuf)) {
650 "bug! continue_tx finished the first time! "
651 "(proto='%c')\n", proto->suffix);
654 retval = NETDEV_TX_OK;
655 dev->trans_start = jiffies;
658 retval = NETDEV_TX_BUSY;
662 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
663 /* make sure we didn't ignore a TX IRQ while we were in here */
666 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
667 lp->intmask |= TXFREEflag|EXCNAKflag;
668 AINTMASK(lp->intmask);
669 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
671 spin_unlock_irqrestore(&lp->lock, flags);
675 return retval; /* no need to try again */
680 * Actually start transmitting a packet that was loaded into a buffer
681 * by prepare_tx. This should _only_ be called by the interrupt handler.
683 static int go_tx(struct net_device *dev)
685 struct arcnet_local *lp = dev->priv;
687 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
688 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
690 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
695 lp->cur_tx = lp->next_tx;
699 ACOMMAND(TXcmd | (lp->cur_tx << 3));
701 lp->stats.tx_packets++;
702 lp->lasttrans_dest = lp->lastload_dest;
703 lp->lastload_dest = 0;
704 lp->excnak_pending = 0;
705 lp->intmask |= TXFREEflag|EXCNAKflag;
711 /* Called by the kernel when transmit times out */
712 static void arcnet_timeout(struct net_device *dev)
715 struct arcnet_local *lp = dev->priv;
716 int status = ASTATUS();
719 spin_lock_irqsave(&lp->lock, flags);
720 if (status & TXFREEflag) { /* transmit _DID_ finish */
721 msg = " - missed IRQ?";
724 lp->stats.tx_aborted_errors++;
726 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
728 lp->stats.tx_errors++;
730 /* make sure we didn't miss a TX or a EXC NAK IRQ */
732 lp->intmask |= TXFREEflag|EXCNAKflag;
733 AINTMASK(lp->intmask);
735 spin_unlock_irqrestore(&lp->lock, flags);
737 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
738 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
739 msg, status, lp->intmask, lp->lasttrans_dest);
740 lp->last_timeout = jiffies;
743 if (lp->cur_tx == -1)
744 netif_wake_queue(dev);
749 * The typical workload of the driver: Handle the network interface
750 * interrupts. Establish which device needs attention, and call the correct
751 * chipset interrupt handler.
753 irqreturn_t arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs)
755 struct net_device *dev = dev_id;
756 struct arcnet_local *lp;
757 int recbuf, status, diagstatus, didsomething, boguscount;
758 int retval = IRQ_NONE;
760 BUGMSG(D_DURING, "\n");
762 BUGMSG(D_DURING, "in arcnet_interrupt\n");
768 spin_lock(&lp->lock);
771 * RESET flag was enabled - if device is not running, we must clear it right
772 * away (but nothing else).
774 if (!netif_running(dev)) {
775 if (ASTATUS() & RESETflag)
776 ACOMMAND(CFLAGScmd | RESETclear);
778 spin_unlock(&lp->lock);
782 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
783 ASTATUS(), lp->intmask);
788 diagstatus = (status >> 8) & 0xFF;
790 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
791 __FILE__,__LINE__,__FUNCTION__,status);
795 * RESET flag was enabled - card is resetting and if RX is
796 * disabled, it's NOT because we just got a packet.
798 * The card is in an undefined state. Clear it out and start over.
800 if (status & RESETflag) {
801 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
805 /* get out of the interrupt handler! */
809 * RX is inhibited - we must have received something. Prepare to
810 * receive into the next buffer.
812 * We don't actually copy the received packet from the card until
813 * after the transmit handler runs (and possibly launches the next
814 * tx); this should improve latency slightly if we get both types
815 * of interrupts at once.
818 if (status & lp->intmask & NORXflag) {
820 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
823 lp->cur_rx = get_arcbuf(dev);
824 if (lp->cur_rx != -1) {
825 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
827 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
832 if((diagstatus & EXCNAKflag)) {
833 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
836 ACOMMAND(NOTXcmd); /* disable transmit */
837 lp->excnak_pending = 1;
839 ACOMMAND(EXCNAKclear);
840 lp->intmask &= ~(EXCNAKflag);
845 /* a transmit finished, and we're interested in it. */
846 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
847 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
849 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
851 if (lp->cur_tx != -1 && !lp->timed_out) {
852 if(!(status & TXACKflag)) {
853 if (lp->lasttrans_dest != 0) {
855 "transmit was not acknowledged! "
856 "(status=%Xh, dest=%02Xh)\n",
857 status, lp->lasttrans_dest);
858 lp->stats.tx_errors++;
859 lp->stats.tx_carrier_errors++;
862 "broadcast was not acknowledged; that's normal "
863 "(status=%Xh, dest=%02Xh)\n",
864 status, lp->lasttrans_dest);
868 if (lp->outgoing.proto &&
869 lp->outgoing.proto->ack_tx) {
871 if(status & TXACKflag)
873 else if(lp->excnak_pending)
879 ->ack_tx(dev, ackstatus);
882 if (lp->cur_tx != -1)
883 release_arcbuf(dev, lp->cur_tx);
889 /* send another packet if there is one */
892 /* continue a split packet, if any */
893 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
894 int txbuf = get_arcbuf(dev);
896 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
897 /* that was the last segment */
898 lp->stats.tx_bytes += lp->outgoing.skb->len;
899 if(!lp->outgoing.proto->ack_tx)
901 dev_kfree_skb_irq(lp->outgoing.skb);
902 lp->outgoing.proto = NULL;
908 /* inform upper layers of idleness, if necessary */
909 if (lp->cur_tx == -1)
910 netif_wake_queue(dev);
912 /* now process the received packet, if any */
914 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
916 arcnet_rx(dev, recbuf);
917 release_arcbuf(dev, recbuf);
921 if (status & lp->intmask & RECONflag) {
922 ACOMMAND(CFLAGScmd | CONFIGclear);
923 lp->stats.tx_carrier_errors++;
925 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
927 /* MYRECON bit is at bit 7 of diagstatus */
928 if(diagstatus & 0x80)
929 BUGMSG(D_RECON,"Put out that recon myself\n");
931 /* is the RECON info empty or old? */
932 if (!lp->first_recon || !lp->last_recon ||
933 jiffies - lp->last_recon > HZ * 10) {
934 if (lp->network_down)
935 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
936 lp->first_recon = lp->last_recon = jiffies;
937 lp->num_recons = lp->network_down = 0;
939 BUGMSG(D_DURING, "recon: clearing counters.\n");
940 } else { /* add to current RECON counter */
941 lp->last_recon = jiffies;
944 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
946 (lp->last_recon - lp->first_recon) / HZ,
949 /* if network is marked up;
950 * and first_recon and last_recon are 60+ apart;
951 * and the average no. of recons counted is
952 * > RECON_THRESHOLD/min;
953 * then print a warning message.
955 if (!lp->network_down
956 && (lp->last_recon - lp->first_recon) <= HZ * 60
957 && lp->num_recons >= RECON_THRESHOLD) {
958 lp->network_down = 1;
959 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
960 } else if (!lp->network_down
961 && lp->last_recon - lp->first_recon > HZ * 60) {
962 /* reset counters if we've gone for over a minute. */
963 lp->first_recon = lp->last_recon;
967 } else if (lp->network_down && jiffies - lp->last_recon > HZ * 10) {
968 if (lp->network_down)
969 BUGMSG(D_NORMAL, "cabling restored?\n");
970 lp->first_recon = lp->last_recon = 0;
971 lp->num_recons = lp->network_down = 0;
973 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
977 retval |= IRQ_HANDLED;
980 while (--boguscount && didsomething);
982 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
983 ASTATUS(), boguscount);
984 BUGMSG(D_DURING, "\n");
989 AINTMASK(lp->intmask);
991 spin_unlock(&lp->lock);
997 * This is a generic packet receiver that calls arcnet??_rx depending on the
1000 void arcnet_rx(struct net_device *dev, int bufnum)
1002 struct arcnet_local *lp = dev->priv;
1004 struct arc_rfc1201 *soft;
1007 soft = &pkt.soft.rfc1201;
1009 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
1010 if (pkt.hard.offset[0]) {
1011 ofs = pkt.hard.offset[0];
1014 ofs = pkt.hard.offset[1];
1018 /* get the full header, if possible */
1019 if (sizeof(pkt.soft) <= length)
1020 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1022 memset(&pkt.soft, 0, sizeof(pkt.soft));
1023 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1026 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1028 bufnum, pkt.hard.source, pkt.hard.dest, length);
1030 lp->stats.rx_packets++;
1031 lp->stats.rx_bytes += length + ARC_HDR_SIZE;
1033 /* call the right receiver for the protocol */
1034 if (arc_proto_map[soft->proto]->is_ip) {
1037 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1038 *newp = arc_proto_map[soft->proto];
1042 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1043 " (was '%c')\n", soft->proto, pkt.hard.source,
1044 newp->suffix, oldp->suffix);
1048 /* broadcasts will always be done with the last-used encap. */
1049 lp->default_proto[0] = soft->proto;
1051 /* in striking contrast, the following isn't a hack. */
1052 lp->default_proto[pkt.hard.source] = soft->proto;
1054 /* call the protocol-specific receiver. */
1055 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1061 * Get the current statistics. This may be called with the card open or
1064 static struct net_device_stats *arcnet_get_stats(struct net_device *dev)
1066 struct arcnet_local *lp = dev->priv;
1071 static void null_rx(struct net_device *dev, int bufnum,
1072 struct archdr *pkthdr, int length)
1075 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1076 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1080 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1081 unsigned short type, uint8_t daddr)
1083 struct arcnet_local *lp = dev->priv;
1086 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1087 lp->default_proto[daddr]);
1094 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1095 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1096 int length, int bufnum)
1098 struct arcnet_local *lp = dev->priv;
1099 struct arc_hardware newpkt;
1101 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1103 /* send a packet to myself -- will never get received, of course */
1104 newpkt.source = newpkt.dest = dev->dev_addr[0];
1106 /* only one byte of actual data (and it's random) */
1107 newpkt.offset[0] = 0xFF;
1109 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1111 return 1; /* done */