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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
52 #include <linux/init.h>
53 #include <linux/jiffies.h>
55 #include "arcdevice.h"
58 /* "do nothing" functions for protocol drivers */
59 static void null_rx(struct net_device *dev, int bufnum,
60 struct archdr *pkthdr, int length);
61 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
62 unsigned short type, uint8_t daddr);
63 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
64 int length, int bufnum);
66 static void arcnet_rx(struct net_device *dev, int bufnum);
68 /* one ArcProto per possible proto ID. None of the elements of
69 * arc_proto_map are allowed to be NULL; they will get set to
70 * arc_proto_default instead. It also must not be NULL; if you would like
71 * to set it to NULL, set it to &arc_proto_null instead.
73 struct ArcProto *arc_proto_map[256];
74 EXPORT_SYMBOL(arc_proto_map);
76 struct ArcProto *arc_proto_default;
77 EXPORT_SYMBOL(arc_proto_default);
79 struct ArcProto *arc_bcast_proto;
80 EXPORT_SYMBOL(arc_bcast_proto);
82 struct ArcProto *arc_raw_proto;
83 EXPORT_SYMBOL(arc_raw_proto);
85 static struct ArcProto arc_proto_null = {
90 .build_header = null_build_header,
91 .prepare_tx = null_prepare_tx,
96 /* Exported function prototypes */
97 int arcnet_debug = ARCNET_DEBUG;
98 EXPORT_SYMBOL(arcnet_debug);
100 /* Internal function prototypes */
101 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
102 unsigned short type, const void *daddr,
103 const void *saddr, unsigned len);
104 static int go_tx(struct net_device *dev);
106 static int debug = ARCNET_DEBUG;
107 module_param(debug, int, 0);
108 MODULE_LICENSE("GPL");
110 static int __init arcnet_init(void)
114 arcnet_debug = debug;
116 pr_info("arcnet loaded\n");
118 /* initialize the protocol map */
119 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
120 for (count = 0; count < 256; count++)
121 arc_proto_map[count] = arc_proto_default;
123 if (BUGLVL(D_DURING))
124 pr_info("struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
125 sizeof(struct arc_hardware),
126 sizeof(struct arc_rfc1201),
127 sizeof(struct arc_rfc1051),
128 sizeof(struct arc_eth_encap),
129 sizeof(struct archdr));
134 static void __exit arcnet_exit(void)
138 module_init(arcnet_init);
139 module_exit(arcnet_exit);
141 /* Dump the contents of an sk_buff */
142 #if ARCNET_DEBUG_MAX & D_SKB
143 void arcnet_dump_skb(struct net_device *dev,
144 struct sk_buff *skb, char *desc)
148 /* dump the packet */
149 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
150 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
151 16, 1, skb->data, skb->len, true);
153 EXPORT_SYMBOL(arcnet_dump_skb);
156 /* Dump the contents of an ARCnet buffer */
157 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
158 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
159 char *desc, int take_arcnet_lock)
161 struct arcnet_local *lp = netdev_priv(dev);
163 unsigned long flags = 0;
164 static uint8_t buf[512];
167 /* hw.copy_from_card expects IRQ context so take the IRQ lock
168 * to keep it single threaded
170 if (take_arcnet_lock)
171 spin_lock_irqsave(&lp->lock, flags);
173 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
174 if (take_arcnet_lock)
175 spin_unlock_irqrestore(&lp->lock, flags);
177 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
178 length = (buf[2] ? 256 : 512);
180 /* dump the packet */
181 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
182 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
183 16, 1, buf, length, true);
188 #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
192 /* Unregister a protocol driver from the arc_proto_map. Protocol drivers
193 * are responsible for registering themselves, but the unregister routine
194 * is pretty generic so we'll do it here.
196 void arcnet_unregister_proto(struct ArcProto *proto)
200 if (arc_proto_default == proto)
201 arc_proto_default = &arc_proto_null;
202 if (arc_bcast_proto == proto)
203 arc_bcast_proto = arc_proto_default;
204 if (arc_raw_proto == proto)
205 arc_raw_proto = arc_proto_default;
207 for (count = 0; count < 256; count++) {
208 if (arc_proto_map[count] == proto)
209 arc_proto_map[count] = arc_proto_default;
212 EXPORT_SYMBOL(arcnet_unregister_proto);
214 /* Add a buffer to the queue. Only the interrupt handler is allowed to do
215 * this, unless interrupts are disabled.
217 * Note: we don't check for a full queue, since there aren't enough buffers
218 * to more than fill it.
220 static void release_arcbuf(struct net_device *dev, int bufnum)
222 struct arcnet_local *lp = netdev_priv(dev);
225 lp->buf_queue[lp->first_free_buf++] = bufnum;
226 lp->first_free_buf %= 5;
228 if (BUGLVL(D_DURING)) {
229 arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ",
231 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
232 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
233 arc_cont(D_DURING, "\n");
237 /* Get a buffer from the queue.
238 * If this returns -1, there are no buffers available.
240 static int get_arcbuf(struct net_device *dev)
242 struct arcnet_local *lp = netdev_priv(dev);
245 if (!atomic_dec_and_test(&lp->buf_lock)) {
246 /* already in this function */
247 arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n",
248 lp->buf_lock.counter);
249 } else { /* we can continue */
250 if (lp->next_buf >= 5)
253 if (lp->next_buf == lp->first_free_buf) {
254 arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n");
256 buf = lp->buf_queue[lp->next_buf++];
261 if (BUGLVL(D_DURING)) {
262 arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ",
264 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
265 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
266 arc_cont(D_DURING, "\n");
269 atomic_inc(&lp->buf_lock);
273 static int choose_mtu(void)
275 int count, mtu = 65535;
277 /* choose the smallest MTU of all available encaps */
278 for (count = 0; count < 256; count++) {
279 if (arc_proto_map[count] != &arc_proto_null &&
280 arc_proto_map[count]->mtu < mtu) {
281 mtu = arc_proto_map[count]->mtu;
285 return mtu == 65535 ? XMTU : mtu;
288 static const struct header_ops arcnet_header_ops = {
289 .create = arcnet_header,
292 static const struct net_device_ops arcnet_netdev_ops = {
293 .ndo_open = arcnet_open,
294 .ndo_stop = arcnet_close,
295 .ndo_start_xmit = arcnet_send_packet,
296 .ndo_tx_timeout = arcnet_timeout,
299 /* Setup a struct device for ARCnet. */
300 static void arcdev_setup(struct net_device *dev)
302 dev->type = ARPHRD_ARCNET;
303 dev->netdev_ops = &arcnet_netdev_ops;
304 dev->header_ops = &arcnet_header_ops;
305 dev->hard_header_len = sizeof(struct arc_hardware);
306 dev->mtu = choose_mtu();
308 dev->addr_len = ARCNET_ALEN;
309 dev->tx_queue_len = 100;
310 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
311 dev->watchdog_timeo = TX_TIMEOUT;
313 /* New-style flags. */
314 dev->flags = IFF_BROADCAST;
317 struct net_device *alloc_arcdev(const char *name)
319 struct net_device *dev;
321 dev = alloc_netdev(sizeof(struct arcnet_local),
322 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
325 struct arcnet_local *lp = netdev_priv(dev);
327 spin_lock_init(&lp->lock);
332 EXPORT_SYMBOL(alloc_arcdev);
334 /* Open/initialize the board. This is called sometime after booting when
335 * the 'ifconfig' program is run.
337 * This routine should set everything up anew at each open, even registers
338 * that "should" only need to be set once at boot, so that there is
339 * non-reboot way to recover if something goes wrong.
341 int arcnet_open(struct net_device *dev)
343 struct arcnet_local *lp = netdev_priv(dev);
344 int count, newmtu, error;
346 arc_printk(D_INIT, dev, "opened.");
348 if (!try_module_get(lp->hw.owner))
351 if (BUGLVL(D_PROTO)) {
352 arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ",
353 arc_proto_default->suffix);
354 for (count = 0; count < 256; count++)
355 arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix);
356 arc_cont(D_PROTO, "\n");
359 arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n");
361 /* try to put the card in a defined state - if it fails the first
362 * time, actually reset it.
365 if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1))
368 newmtu = choose_mtu();
369 if (newmtu < dev->mtu)
372 arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu);
374 /* autodetect the encapsulation for each host. */
375 memset(lp->default_proto, 0, sizeof(lp->default_proto));
377 /* the broadcast address is special - use the 'bcast' protocol */
378 for (count = 0; count < 256; count++) {
379 if (arc_proto_map[count] == arc_bcast_proto) {
380 lp->default_proto[0] = count;
385 /* initialize buffers */
386 atomic_set(&lp->buf_lock, 1);
388 lp->next_buf = lp->first_free_buf = 0;
389 release_arcbuf(dev, 0);
390 release_arcbuf(dev, 1);
391 release_arcbuf(dev, 2);
392 release_arcbuf(dev, 3);
393 lp->cur_tx = lp->next_tx = -1;
396 lp->rfc1201.sequence = 1;
398 /* bring up the hardware driver */
402 if (dev->dev_addr[0] == 0)
403 arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n");
404 else if (dev->dev_addr[0] == 255)
405 arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n");
407 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
408 if (lp->hw.status(dev) & RESETflag) {
409 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
410 __FILE__, __LINE__, __func__);
411 lp->hw.command(dev, CFLAGScmd | RESETclear);
414 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
415 /* make sure we're ready to receive IRQ's. */
416 lp->hw.intmask(dev, 0);
417 udelay(1); /* give it time to set the mask before
418 * we reset it again. (may not even be
421 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
422 lp->intmask = NORXflag | RECONflag;
423 lp->hw.intmask(dev, lp->intmask);
424 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
426 netif_start_queue(dev);
431 module_put(lp->hw.owner);
434 EXPORT_SYMBOL(arcnet_open);
436 /* The inverse routine to arcnet_open - shuts down the card. */
437 int arcnet_close(struct net_device *dev)
439 struct arcnet_local *lp = netdev_priv(dev);
441 netif_stop_queue(dev);
443 /* flush TX and disable RX */
444 lp->hw.intmask(dev, 0);
445 lp->hw.command(dev, NOTXcmd); /* stop transmit */
446 lp->hw.command(dev, NORXcmd); /* disable receive */
449 /* shut down the card */
451 module_put(lp->hw.owner);
454 EXPORT_SYMBOL(arcnet_close);
456 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
457 unsigned short type, const void *daddr,
458 const void *saddr, unsigned len)
460 const struct arcnet_local *lp = netdev_priv(dev);
461 uint8_t _daddr, proto_num;
462 struct ArcProto *proto;
464 arc_printk(D_DURING, dev,
465 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
466 saddr ? *(uint8_t *)saddr : -1,
467 daddr ? *(uint8_t *)daddr : -1,
470 if (skb->len != 0 && len != skb->len)
471 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
474 /* Type is host order - ? */
475 if (type == ETH_P_ARCNET) {
476 proto = arc_raw_proto;
477 arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n",
479 _daddr = daddr ? *(uint8_t *)daddr : 0;
481 /* if the dest addr isn't provided, we can't choose an
482 * encapsulation! Store the packet type (eg. ETH_P_IP)
483 * for now, and we'll push on a real header when we do
486 *(uint16_t *)skb_push(skb, 2) = type;
487 /* XXX: Why not use skb->mac_len? */
488 if (skb->network_header - skb->mac_header != 2)
489 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n",
490 skb->network_header - skb->mac_header);
491 return -2; /* return error -- can't transmit yet! */
493 /* otherwise, we can just add the header as usual. */
494 _daddr = *(uint8_t *)daddr;
495 proto_num = lp->default_proto[_daddr];
496 proto = arc_proto_map[proto_num];
497 arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n",
498 proto_num, proto->suffix);
499 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
500 arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n",
501 arc_bcast_proto->suffix);
502 proto = arc_bcast_proto;
505 return proto->build_header(skb, dev, type, _daddr);
508 /* Called by the kernel in order to transmit a packet. */
509 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
510 struct net_device *dev)
512 struct arcnet_local *lp = netdev_priv(dev);
514 struct arc_rfc1201 *soft;
515 struct ArcProto *proto;
520 arc_printk(D_DURING, dev,
521 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
522 lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
524 pkt = (struct archdr *)skb->data;
525 soft = &pkt->soft.rfc1201;
526 proto = arc_proto_map[soft->proto];
528 arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n",
529 skb->len, pkt->hard.dest);
531 arcnet_dump_skb(dev, skb, "tx");
533 /* fits in one packet? */
534 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
535 arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n");
537 return NETDEV_TX_OK; /* don't try again */
540 /* We're busy transmitting a packet... */
541 netif_stop_queue(dev);
543 spin_lock_irqsave(&lp->lock, flags);
544 lp->hw.intmask(dev, 0);
545 if (lp->next_tx == -1)
546 txbuf = get_arcbuf(dev);
551 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
553 /* done right away and we don't want to acknowledge
554 * the package later - forget about it now
556 dev->stats.tx_bytes += skb->len;
559 /* do it the 'split' way */
560 lp->outgoing.proto = proto;
561 lp->outgoing.skb = skb;
562 lp->outgoing.pkt = pkt;
566 if (proto->continue_tx &&
567 proto->continue_tx(dev, txbuf)) {
568 arc_printk(D_NORMAL, dev,
569 "bug! continue_tx finished the first time! (proto='%c')\n",
573 retval = NETDEV_TX_OK;
576 retval = NETDEV_TX_BUSY;
580 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
581 __FILE__, __LINE__, __func__, lp->hw.status(dev));
582 /* make sure we didn't ignore a TX IRQ while we were in here */
583 lp->hw.intmask(dev, 0);
585 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
586 lp->intmask |= TXFREEflag | EXCNAKflag;
587 lp->hw.intmask(dev, lp->intmask);
588 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
589 __FILE__, __LINE__, __func__, lp->hw.status(dev));
591 spin_unlock_irqrestore(&lp->lock, flags);
595 return retval; /* no need to try again */
597 EXPORT_SYMBOL(arcnet_send_packet);
599 /* Actually start transmitting a packet that was loaded into a buffer
600 * by prepare_tx. This should _only_ be called by the interrupt handler.
602 static int go_tx(struct net_device *dev)
604 struct arcnet_local *lp = netdev_priv(dev);
606 arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
607 lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx);
609 if (lp->cur_tx != -1 || lp->next_tx == -1)
613 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
615 lp->cur_tx = lp->next_tx;
619 lp->hw.command(dev, TXcmd | (lp->cur_tx << 3));
621 dev->stats.tx_packets++;
622 lp->lasttrans_dest = lp->lastload_dest;
623 lp->lastload_dest = 0;
624 lp->excnak_pending = 0;
625 lp->intmask |= TXFREEflag | EXCNAKflag;
630 /* Called by the kernel when transmit times out */
631 void arcnet_timeout(struct net_device *dev)
634 struct arcnet_local *lp = netdev_priv(dev);
635 int status = lp->hw.status(dev);
638 spin_lock_irqsave(&lp->lock, flags);
639 if (status & TXFREEflag) { /* transmit _DID_ finish */
640 msg = " - missed IRQ?";
643 dev->stats.tx_aborted_errors++;
645 lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3));
647 dev->stats.tx_errors++;
649 /* make sure we didn't miss a TX or a EXC NAK IRQ */
650 lp->hw.intmask(dev, 0);
651 lp->intmask |= TXFREEflag | EXCNAKflag;
652 lp->hw.intmask(dev, lp->intmask);
654 spin_unlock_irqrestore(&lp->lock, flags);
656 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
657 arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
658 msg, status, lp->intmask, lp->lasttrans_dest);
659 lp->last_timeout = jiffies;
662 if (lp->cur_tx == -1)
663 netif_wake_queue(dev);
665 EXPORT_SYMBOL(arcnet_timeout);
667 /* The typical workload of the driver: Handle the network interface
668 * interrupts. Establish which device needs attention, and call the correct
669 * chipset interrupt handler.
671 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
673 struct net_device *dev = dev_id;
674 struct arcnet_local *lp;
675 int recbuf, status, diagstatus, didsomething, boguscount;
676 int retval = IRQ_NONE;
678 arc_printk(D_DURING, dev, "\n");
680 arc_printk(D_DURING, dev, "in arcnet_interrupt\n");
682 lp = netdev_priv(dev);
685 spin_lock(&lp->lock);
687 /* RESET flag was enabled - if device is not running, we must
688 * clear it right away (but nothing else).
690 if (!netif_running(dev)) {
691 if (lp->hw.status(dev) & RESETflag)
692 lp->hw.command(dev, CFLAGScmd | RESETclear);
693 lp->hw.intmask(dev, 0);
694 spin_unlock(&lp->lock);
698 arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
699 lp->hw.status(dev), lp->intmask);
703 status = lp->hw.status(dev);
704 diagstatus = (status >> 8) & 0xFF;
706 arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n",
707 __FILE__, __LINE__, __func__, status);
710 /* RESET flag was enabled - card is resetting and if RX is
711 * disabled, it's NOT because we just got a packet.
713 * The card is in an undefined state.
714 * Clear it out and start over.
716 if (status & RESETflag) {
717 arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",
722 /* get out of the interrupt handler! */
725 /* RX is inhibited - we must have received something.
726 * Prepare to receive into the next buffer.
728 * We don't actually copy the received packet from the card
729 * until after the transmit handler runs (and possibly
730 * launches the next tx); this should improve latency slightly
731 * if we get both types of interrupts at once.
734 if (status & lp->intmask & NORXflag) {
736 arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n",
739 lp->cur_rx = get_arcbuf(dev);
740 if (lp->cur_rx != -1) {
741 arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n",
743 lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts);
748 if ((diagstatus & EXCNAKflag)) {
749 arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n",
752 lp->hw.command(dev, NOTXcmd); /* disable transmit */
753 lp->excnak_pending = 1;
755 lp->hw.command(dev, EXCNAKclear);
756 lp->intmask &= ~(EXCNAKflag);
760 /* a transmit finished, and we're interested in it. */
761 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
762 lp->intmask &= ~(TXFREEflag | EXCNAKflag);
764 arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n",
767 if (lp->cur_tx != -1 && !lp->timed_out) {
768 if (!(status & TXACKflag)) {
769 if (lp->lasttrans_dest != 0) {
770 arc_printk(D_EXTRA, dev,
771 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
774 dev->stats.tx_errors++;
775 dev->stats.tx_carrier_errors++;
777 arc_printk(D_DURING, dev,
778 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
784 if (lp->outgoing.proto &&
785 lp->outgoing.proto->ack_tx) {
788 if (status & TXACKflag)
790 else if (lp->excnak_pending)
796 ->ack_tx(dev, ackstatus);
799 if (lp->cur_tx != -1)
800 release_arcbuf(dev, lp->cur_tx);
806 /* send another packet if there is one */
809 /* continue a split packet, if any */
810 if (lp->outgoing.proto &&
811 lp->outgoing.proto->continue_tx) {
812 int txbuf = get_arcbuf(dev);
815 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
816 /* that was the last segment */
817 dev->stats.tx_bytes += lp->outgoing.skb->len;
818 if (!lp->outgoing.proto->ack_tx) {
819 dev_kfree_skb_irq(lp->outgoing.skb);
820 lp->outgoing.proto = NULL;
826 /* inform upper layers of idleness, if necessary */
827 if (lp->cur_tx == -1)
828 netif_wake_queue(dev);
830 /* now process the received packet, if any */
833 arcnet_dump_packet(dev, recbuf, "rx irq", 0);
835 arcnet_rx(dev, recbuf);
836 release_arcbuf(dev, recbuf);
840 if (status & lp->intmask & RECONflag) {
841 lp->hw.command(dev, CFLAGScmd | CONFIGclear);
842 dev->stats.tx_carrier_errors++;
844 arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",
846 /* MYRECON bit is at bit 7 of diagstatus */
847 if (diagstatus & 0x80)
848 arc_printk(D_RECON, dev, "Put out that recon myself\n");
850 /* is the RECON info empty or old? */
851 if (!lp->first_recon || !lp->last_recon ||
852 time_after(jiffies, lp->last_recon + HZ * 10)) {
853 if (lp->network_down)
854 arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n");
855 lp->first_recon = lp->last_recon = jiffies;
856 lp->num_recons = lp->network_down = 0;
858 arc_printk(D_DURING, dev, "recon: clearing counters.\n");
859 } else { /* add to current RECON counter */
860 lp->last_recon = jiffies;
863 arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n",
865 (lp->last_recon - lp->first_recon) / HZ,
868 /* if network is marked up;
869 * and first_recon and last_recon are 60+ apart;
870 * and the average no. of recons counted is
871 * > RECON_THRESHOLD/min;
872 * then print a warning message.
874 if (!lp->network_down &&
875 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
876 lp->num_recons >= RECON_THRESHOLD) {
877 lp->network_down = 1;
878 arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n");
879 } else if (!lp->network_down &&
880 lp->last_recon - lp->first_recon > HZ * 60) {
881 /* reset counters if we've gone for
884 lp->first_recon = lp->last_recon;
888 } else if (lp->network_down &&
889 time_after(jiffies, lp->last_recon + HZ * 10)) {
890 if (lp->network_down)
891 arc_printk(D_NORMAL, dev, "cabling restored?\n");
892 lp->first_recon = lp->last_recon = 0;
893 lp->num_recons = lp->network_down = 0;
895 arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n");
899 retval |= IRQ_HANDLED;
900 } while (--boguscount && didsomething);
902 arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
903 lp->hw.status(dev), boguscount);
904 arc_printk(D_DURING, dev, "\n");
906 lp->hw.intmask(dev, 0);
908 lp->hw.intmask(dev, lp->intmask);
910 spin_unlock(&lp->lock);
913 EXPORT_SYMBOL(arcnet_interrupt);
915 /* This is a generic packet receiver that calls arcnet??_rx depending on the
918 static void arcnet_rx(struct net_device *dev, int bufnum)
920 struct arcnet_local *lp = netdev_priv(dev);
922 struct arc_rfc1201 *soft;
925 soft = &pkt.soft.rfc1201;
927 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
928 if (pkt.hard.offset[0]) {
929 ofs = pkt.hard.offset[0];
932 ofs = pkt.hard.offset[1];
936 /* get the full header, if possible */
937 if (sizeof(pkt.soft) <= length) {
938 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
940 memset(&pkt.soft, 0, sizeof(pkt.soft));
941 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
944 arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
945 bufnum, pkt.hard.source, pkt.hard.dest, length);
947 dev->stats.rx_packets++;
948 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
950 /* call the right receiver for the protocol */
951 if (arc_proto_map[soft->proto]->is_ip) {
952 if (BUGLVL(D_PROTO)) {
954 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
955 *newp = arc_proto_map[soft->proto];
958 arc_printk(D_PROTO, dev,
959 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
960 soft->proto, pkt.hard.source,
961 newp->suffix, oldp->suffix);
965 /* broadcasts will always be done with the last-used encap. */
966 lp->default_proto[0] = soft->proto;
968 /* in striking contrast, the following isn't a hack. */
969 lp->default_proto[pkt.hard.source] = soft->proto;
971 /* call the protocol-specific receiver. */
972 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
975 static void null_rx(struct net_device *dev, int bufnum,
976 struct archdr *pkthdr, int length)
978 arc_printk(D_PROTO, dev,
979 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
980 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
983 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
984 unsigned short type, uint8_t daddr)
986 struct arcnet_local *lp = netdev_priv(dev);
988 arc_printk(D_PROTO, dev,
989 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
990 lp->default_proto[daddr]);
996 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
997 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
998 int length, int bufnum)
1000 struct arcnet_local *lp = netdev_priv(dev);
1001 struct arc_hardware newpkt;
1003 arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n");
1005 /* send a packet to myself -- will never get received, of course */
1006 newpkt.source = newpkt.dest = dev->dev_addr[0];
1008 /* only one byte of actual data (and it's random) */
1009 newpkt.offset[0] = 0xFF;
1011 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1013 return 1; /* done */