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: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
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/arcdevice.h>
54 #include <linux/jiffies.h>
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);
64 static void arcnet_rx(struct net_device *dev, 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 static 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(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);
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 go_tx(struct net_device *dev);
109 static int debug = ARCNET_DEBUG;
110 module_param(debug, int, 0);
111 MODULE_LICENSE("GPL");
113 static int __init arcnet_init(void)
117 arcnet_debug = debug;
119 printk("arcnet loaded.\n");
123 printk("arcnet: ***\n"
124 "arcnet: * Read arcnet.txt for important release notes!\n"
126 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
127 "arcnet: * me if you have any questions, comments, or bug reports.\n"
132 /* initialize the protocol map */
133 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
134 for (count = 0; count < 256; count++)
135 arc_proto_map[count] = arc_proto_default;
138 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
139 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
140 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
141 sizeof(struct archdr));
146 static void __exit arcnet_exit(void)
150 module_init(arcnet_init);
151 module_exit(arcnet_exit);
154 * Dump the contents of an sk_buff
156 #if ARCNET_DEBUG_MAX & D_SKB
157 void arcnet_dump_skb(struct net_device *dev,
158 struct sk_buff *skb, char *desc)
162 /* dump the packet */
163 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
164 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
165 16, 1, skb->data, skb->len, true);
168 EXPORT_SYMBOL(arcnet_dump_skb);
172 * Dump the contents of an ARCnet buffer
174 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
175 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
176 char *desc, int take_arcnet_lock)
178 struct arcnet_local *lp = netdev_priv(dev);
180 unsigned long flags = 0;
181 static uint8_t buf[512];
184 /* hw.copy_from_card expects IRQ context so take the IRQ lock
185 to keep it single threaded */
186 if (take_arcnet_lock)
187 spin_lock_irqsave(&lp->lock, flags);
189 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
190 if (take_arcnet_lock)
191 spin_unlock_irqrestore(&lp->lock, flags);
193 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
194 length = (buf[2] ? 256 : 512);
196 /* dump the packet */
197 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
198 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
199 16, 1, buf, length, true);
204 #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
209 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
210 * are responsible for registering themselves, but the unregister routine
211 * is pretty generic so we'll do it here.
213 void arcnet_unregister_proto(struct ArcProto *proto)
217 if (arc_proto_default == proto)
218 arc_proto_default = &arc_proto_null;
219 if (arc_bcast_proto == proto)
220 arc_bcast_proto = arc_proto_default;
221 if (arc_raw_proto == proto)
222 arc_raw_proto = arc_proto_default;
224 for (count = 0; count < 256; count++) {
225 if (arc_proto_map[count] == proto)
226 arc_proto_map[count] = arc_proto_default;
231 * Add a buffer to the queue. Only the interrupt handler is allowed to do
232 * this, unless interrupts are disabled.
234 * Note: we don't check for a full queue, since there aren't enough buffers
235 * to more than fill it.
237 static void release_arcbuf(struct net_device *dev, int bufnum)
239 struct arcnet_local *lp = netdev_priv(dev);
242 lp->buf_queue[lp->first_free_buf++] = bufnum;
243 lp->first_free_buf %= 5;
246 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
248 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
249 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
250 BUGMSG2(D_DURING, "\n");
255 * Get a buffer from the queue. If this returns -1, there are no buffers
258 static int get_arcbuf(struct net_device *dev)
260 struct arcnet_local *lp = netdev_priv(dev);
263 if (!atomic_dec_and_test(&lp->buf_lock)) {
264 /* already in this function */
265 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
266 lp->buf_lock.counter);
268 else { /* we can continue */
269 if (lp->next_buf >= 5)
272 if (lp->next_buf == lp->first_free_buf)
273 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
275 buf = lp->buf_queue[lp->next_buf++];
281 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
282 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
283 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
284 BUGMSG2(D_DURING, "\n");
287 atomic_inc(&lp->buf_lock);
291 static int choose_mtu(void)
293 int count, mtu = 65535;
295 /* choose the smallest MTU of all available encaps */
296 for (count = 0; count < 256; count++) {
297 if (arc_proto_map[count] != &arc_proto_null &&
298 arc_proto_map[count]->mtu < mtu) {
299 mtu = arc_proto_map[count]->mtu;
303 return mtu == 65535 ? XMTU : mtu;
306 static const struct header_ops arcnet_header_ops = {
307 .create = arcnet_header,
310 static const struct net_device_ops arcnet_netdev_ops = {
311 .ndo_open = arcnet_open,
312 .ndo_stop = arcnet_close,
313 .ndo_start_xmit = arcnet_send_packet,
314 .ndo_tx_timeout = arcnet_timeout,
317 /* Setup a struct device for ARCnet. */
318 static void arcdev_setup(struct net_device *dev)
320 dev->type = ARPHRD_ARCNET;
321 dev->netdev_ops = &arcnet_netdev_ops;
322 dev->header_ops = &arcnet_header_ops;
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;
336 struct net_device *alloc_arcdev(const char *name)
338 struct net_device *dev;
340 dev = alloc_netdev(sizeof(struct arcnet_local),
341 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
344 struct arcnet_local *lp = netdev_priv(dev);
346 spin_lock_init(&lp->lock);
353 * Open/initialize the board. This is called sometime after booting when
354 * the 'ifconfig' program is run.
356 * This routine should set everything up anew at each open, even registers
357 * that "should" only need to be set once at boot, so that there is
358 * non-reboot way to recover if something goes wrong.
360 int arcnet_open(struct net_device *dev)
362 struct arcnet_local *lp = netdev_priv(dev);
363 int count, newmtu, error;
365 BUGMSG(D_INIT, "opened.");
367 if (!try_module_get(lp->hw.owner))
371 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
372 arc_proto_default->suffix);
373 for (count = 0; count < 256; count++)
374 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
375 BUGMSG2(D_PROTO, "\n");
378 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
380 /* try to put the card in a defined state - if it fails the first
381 * time, actually reset it.
384 if (ARCRESET(0) && ARCRESET(1))
387 newmtu = choose_mtu();
388 if (newmtu < dev->mtu)
391 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
393 /* autodetect the encapsulation for each host. */
394 memset(lp->default_proto, 0, sizeof(lp->default_proto));
396 /* the broadcast address is special - use the 'bcast' protocol */
397 for (count = 0; count < 256; count++) {
398 if (arc_proto_map[count] == arc_bcast_proto) {
399 lp->default_proto[0] = count;
404 /* initialize buffers */
405 atomic_set(&lp->buf_lock, 1);
407 lp->next_buf = lp->first_free_buf = 0;
408 release_arcbuf(dev, 0);
409 release_arcbuf(dev, 1);
410 release_arcbuf(dev, 2);
411 release_arcbuf(dev, 3);
412 lp->cur_tx = lp->next_tx = -1;
415 lp->rfc1201.sequence = 1;
417 /* bring up the hardware driver */
421 if (dev->dev_addr[0] == 0)
422 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
423 "for broadcasts!\n");
424 else if (dev->dev_addr[0] == 255)
425 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
426 "DOS networking programs!\n");
428 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
429 if (ASTATUS() & RESETflag) {
430 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
431 ACOMMAND(CFLAGScmd | RESETclear);
434 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
435 /* make sure we're ready to receive IRQ's. */
437 udelay(1); /* give it time to set the mask before
438 * we reset it again. (may not even be
441 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
442 lp->intmask = NORXflag | RECONflag;
443 AINTMASK(lp->intmask);
444 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
446 netif_start_queue(dev);
451 module_put(lp->hw.owner);
455 /* The inverse routine to arcnet_open - shuts down the card. */
456 int arcnet_close(struct net_device *dev)
458 struct arcnet_local *lp = netdev_priv(dev);
460 netif_stop_queue(dev);
462 /* flush TX and disable RX */
464 ACOMMAND(NOTXcmd); /* stop transmit */
465 ACOMMAND(NORXcmd); /* disable receive */
468 /* shut down the card */
470 module_put(lp->hw.owner);
474 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
475 unsigned short type, const void *daddr,
476 const void *saddr, unsigned len)
478 const struct arcnet_local *lp = netdev_priv(dev);
479 uint8_t _daddr, proto_num;
480 struct ArcProto *proto;
483 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
484 saddr ? *(uint8_t *)saddr : -1,
485 daddr ? *(uint8_t *)daddr : -1,
488 if (skb->len != 0 && len != skb->len)
489 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
492 /* Type is host order - ? */
493 if (type == ETH_P_ARCNET) {
494 proto = arc_raw_proto;
495 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n", proto->suffix);
496 _daddr = daddr ? *(uint8_t *)daddr : 0;
500 * if the dest addr isn't provided, we can't choose an encapsulation!
501 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
502 * real header when we do rebuild_header.
504 *(uint16_t *)skb_push(skb, 2) = type;
506 * XXX: Why not use skb->mac_len?
508 if (skb->network_header - skb->mac_header != 2)
509 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
510 (int)(skb->network_header - skb->mac_header));
511 return -2; /* return error -- can't transmit yet! */
514 /* otherwise, we can just add the header as usual. */
515 _daddr = *(uint8_t *)daddr;
516 proto_num = lp->default_proto[_daddr];
517 proto = arc_proto_map[proto_num];
518 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
519 proto_num, proto->suffix);
520 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
521 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
522 arc_bcast_proto->suffix);
523 proto = arc_bcast_proto;
526 return proto->build_header(skb, dev, type, _daddr);
529 /* Called by the kernel in order to transmit a packet. */
530 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
531 struct net_device *dev)
533 struct arcnet_local *lp = netdev_priv(dev);
535 struct arc_rfc1201 *soft;
536 struct ArcProto *proto;
542 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
543 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
545 pkt = (struct archdr *)skb->data;
546 soft = &pkt->soft.rfc1201;
547 proto = arc_proto_map[soft->proto];
549 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
550 skb->len, pkt->hard.dest);
551 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
553 /* fits in one packet? */
554 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
555 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
557 return NETDEV_TX_OK; /* don't try again */
560 /* We're busy transmitting a packet... */
561 netif_stop_queue(dev);
563 spin_lock_irqsave(&lp->lock, flags);
565 if (lp->next_tx == -1)
566 txbuf = get_arcbuf(dev);
571 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
573 /* done right away and we don't want to acknowledge
574 the package later - forget about it now */
575 dev->stats.tx_bytes += skb->len;
578 /* do it the 'split' way */
579 lp->outgoing.proto = proto;
580 lp->outgoing.skb = skb;
581 lp->outgoing.pkt = pkt;
585 if (proto->continue_tx &&
586 proto->continue_tx(dev, txbuf)) {
588 "bug! continue_tx finished the first time! "
589 "(proto='%c')\n", proto->suffix);
592 retval = NETDEV_TX_OK;
595 retval = NETDEV_TX_BUSY;
599 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS());
600 /* make sure we didn't ignore a TX IRQ while we were in here */
603 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
604 lp->intmask |= TXFREEflag | EXCNAKflag;
605 AINTMASK(lp->intmask);
606 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS());
608 spin_unlock_irqrestore(&lp->lock, flags);
612 return retval; /* no need to try again */
616 * Actually start transmitting a packet that was loaded into a buffer
617 * by prepare_tx. This should _only_ be called by the interrupt handler.
619 static int go_tx(struct net_device *dev)
621 struct arcnet_local *lp = netdev_priv(dev);
623 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
624 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
626 if (lp->cur_tx != -1 || lp->next_tx == -1)
629 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
631 lp->cur_tx = lp->next_tx;
635 ACOMMAND(TXcmd | (lp->cur_tx << 3));
637 dev->stats.tx_packets++;
638 lp->lasttrans_dest = lp->lastload_dest;
639 lp->lastload_dest = 0;
640 lp->excnak_pending = 0;
641 lp->intmask |= TXFREEflag | EXCNAKflag;
646 /* Called by the kernel when transmit times out */
647 void arcnet_timeout(struct net_device *dev)
650 struct arcnet_local *lp = netdev_priv(dev);
651 int status = ASTATUS();
654 spin_lock_irqsave(&lp->lock, flags);
655 if (status & TXFREEflag) { /* transmit _DID_ finish */
656 msg = " - missed IRQ?";
659 dev->stats.tx_aborted_errors++;
661 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
663 dev->stats.tx_errors++;
665 /* make sure we didn't miss a TX or a EXC NAK IRQ */
667 lp->intmask |= TXFREEflag | EXCNAKflag;
668 AINTMASK(lp->intmask);
670 spin_unlock_irqrestore(&lp->lock, flags);
672 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
673 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
674 msg, status, lp->intmask, lp->lasttrans_dest);
675 lp->last_timeout = jiffies;
678 if (lp->cur_tx == -1)
679 netif_wake_queue(dev);
683 * The typical workload of the driver: Handle the network interface
684 * interrupts. Establish which device needs attention, and call the correct
685 * chipset interrupt handler.
687 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
689 struct net_device *dev = dev_id;
690 struct arcnet_local *lp;
691 int recbuf, status, diagstatus, didsomething, boguscount;
692 int retval = IRQ_NONE;
694 BUGMSG(D_DURING, "\n");
696 BUGMSG(D_DURING, "in arcnet_interrupt\n");
698 lp = netdev_priv(dev);
701 spin_lock(&lp->lock);
704 * RESET flag was enabled - if device is not running, we must clear it right
705 * away (but nothing else).
707 if (!netif_running(dev)) {
708 if (ASTATUS() & RESETflag)
709 ACOMMAND(CFLAGScmd | RESETclear);
711 spin_unlock(&lp->lock);
715 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
716 ASTATUS(), lp->intmask);
721 diagstatus = (status >> 8) & 0xFF;
723 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
724 __FILE__, __LINE__, __func__, status);
728 * RESET flag was enabled - card is resetting and if RX is
729 * disabled, it's NOT because we just got a packet.
731 * The card is in an undefined state. Clear it out and start over.
733 if (status & RESETflag) {
734 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
738 /* get out of the interrupt handler! */
742 * RX is inhibited - we must have received something. Prepare to
743 * receive into the next buffer.
745 * We don't actually copy the received packet from the card until
746 * after the transmit handler runs (and possibly launches the next
747 * tx); this should improve latency slightly if we get both types
748 * of interrupts at once.
751 if (status & lp->intmask & NORXflag) {
753 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
756 lp->cur_rx = get_arcbuf(dev);
757 if (lp->cur_rx != -1) {
758 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
760 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
765 if ((diagstatus & EXCNAKflag)) {
766 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
769 ACOMMAND(NOTXcmd); /* disable transmit */
770 lp->excnak_pending = 1;
772 ACOMMAND(EXCNAKclear);
773 lp->intmask &= ~(EXCNAKflag);
777 /* a transmit finished, and we're interested in it. */
778 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
779 lp->intmask &= ~(TXFREEflag | EXCNAKflag);
781 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
783 if (lp->cur_tx != -1 && !lp->timed_out) {
784 if (!(status & TXACKflag)) {
785 if (lp->lasttrans_dest != 0) {
787 "transmit was not acknowledged! "
788 "(status=%Xh, dest=%02Xh)\n",
789 status, lp->lasttrans_dest);
790 dev->stats.tx_errors++;
791 dev->stats.tx_carrier_errors++;
794 "broadcast was not acknowledged; that's normal "
795 "(status=%Xh, dest=%02Xh)\n",
796 status, lp->lasttrans_dest);
800 if (lp->outgoing.proto &&
801 lp->outgoing.proto->ack_tx) {
804 if (status & TXACKflag)
806 else if (lp->excnak_pending)
812 ->ack_tx(dev, ackstatus);
815 if (lp->cur_tx != -1)
816 release_arcbuf(dev, lp->cur_tx);
822 /* send another packet if there is one */
825 /* continue a split packet, if any */
826 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
827 int txbuf = get_arcbuf(dev);
830 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
831 /* that was the last segment */
832 dev->stats.tx_bytes += lp->outgoing.skb->len;
833 if (!lp->outgoing.proto->ack_tx)
835 dev_kfree_skb_irq(lp->outgoing.skb);
836 lp->outgoing.proto = NULL;
842 /* inform upper layers of idleness, if necessary */
843 if (lp->cur_tx == -1)
844 netif_wake_queue(dev);
846 /* now process the received packet, if any */
848 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
850 arcnet_rx(dev, recbuf);
851 release_arcbuf(dev, recbuf);
855 if (status & lp->intmask & RECONflag) {
856 ACOMMAND(CFLAGScmd | CONFIGclear);
857 dev->stats.tx_carrier_errors++;
859 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
861 /* MYRECON bit is at bit 7 of diagstatus */
862 if (diagstatus & 0x80)
863 BUGMSG(D_RECON, "Put out that recon myself\n");
865 /* is the RECON info empty or old? */
866 if (!lp->first_recon || !lp->last_recon ||
867 time_after(jiffies, lp->last_recon + HZ * 10)) {
868 if (lp->network_down)
869 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
870 lp->first_recon = lp->last_recon = jiffies;
871 lp->num_recons = lp->network_down = 0;
873 BUGMSG(D_DURING, "recon: clearing counters.\n");
874 } else { /* add to current RECON counter */
875 lp->last_recon = jiffies;
878 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
880 (lp->last_recon - lp->first_recon) / HZ,
883 /* if network is marked up;
884 * and first_recon and last_recon are 60+ apart;
885 * and the average no. of recons counted is
886 * > RECON_THRESHOLD/min;
887 * then print a warning message.
889 if (!lp->network_down &&
890 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
891 lp->num_recons >= RECON_THRESHOLD) {
892 lp->network_down = 1;
893 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
894 } else if (!lp->network_down &&
895 lp->last_recon - lp->first_recon > HZ * 60) {
896 /* reset counters if we've gone for over a minute. */
897 lp->first_recon = lp->last_recon;
901 } else if (lp->network_down &&
902 time_after(jiffies, lp->last_recon + HZ * 10)) {
903 if (lp->network_down)
904 BUGMSG(D_NORMAL, "cabling restored?\n");
905 lp->first_recon = lp->last_recon = 0;
906 lp->num_recons = lp->network_down = 0;
908 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
912 retval |= IRQ_HANDLED;
915 while (--boguscount && didsomething);
917 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
918 ASTATUS(), boguscount);
919 BUGMSG(D_DURING, "\n");
923 AINTMASK(lp->intmask);
925 spin_unlock(&lp->lock);
930 * This is a generic packet receiver that calls arcnet??_rx depending on the
933 static void arcnet_rx(struct net_device *dev, int bufnum)
935 struct arcnet_local *lp = netdev_priv(dev);
937 struct arc_rfc1201 *soft;
940 soft = &pkt.soft.rfc1201;
942 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
943 if (pkt.hard.offset[0]) {
944 ofs = pkt.hard.offset[0];
947 ofs = pkt.hard.offset[1];
951 /* get the full header, if possible */
952 if (sizeof(pkt.soft) <= length)
953 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
955 memset(&pkt.soft, 0, sizeof(pkt.soft));
956 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
959 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
961 bufnum, pkt.hard.source, pkt.hard.dest, length);
963 dev->stats.rx_packets++;
964 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
966 /* call the right receiver for the protocol */
967 if (arc_proto_map[soft->proto]->is_ip) {
970 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
971 *newp = arc_proto_map[soft->proto];
975 "got protocol %02Xh; encap for host %02Xh is now '%c'"
976 " (was '%c')\n", soft->proto, pkt.hard.source,
977 newp->suffix, oldp->suffix);
981 /* broadcasts will always be done with the last-used encap. */
982 lp->default_proto[0] = soft->proto;
984 /* in striking contrast, the following isn't a hack. */
985 lp->default_proto[pkt.hard.source] = soft->proto;
987 /* call the protocol-specific receiver. */
988 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
991 static void null_rx(struct net_device *dev, int bufnum,
992 struct archdr *pkthdr, int length)
995 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
996 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
999 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1000 unsigned short type, uint8_t daddr)
1002 struct arcnet_local *lp = netdev_priv(dev);
1005 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1006 lp->default_proto[daddr]);
1012 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1013 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1014 int length, int bufnum)
1016 struct arcnet_local *lp = netdev_priv(dev);
1017 struct arc_hardware newpkt;
1019 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1021 /* send a packet to myself -- will never get received, of course */
1022 newpkt.source = newpkt.dest = dev->dev_addr[0];
1024 /* only one byte of actual data (and it's random) */
1025 newpkt.offset[0] = 0xFF;
1027 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1029 return 1; /* done */