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>
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
, *arc_bcast_proto
;
74 struct ArcProto arc_proto_null
=
79 .build_header
= null_build_header
,
80 .prepare_tx
= null_prepare_tx
,
83 static spinlock_t arcnet_lock
= SPIN_LOCK_UNLOCKED
;
85 /* Exported function prototypes */
86 int arcnet_debug
= ARCNET_DEBUG
;
88 EXPORT_SYMBOL(arc_proto_map
);
89 EXPORT_SYMBOL(arc_proto_default
);
90 EXPORT_SYMBOL(arc_bcast_proto
);
91 EXPORT_SYMBOL(arc_proto_null
);
92 EXPORT_SYMBOL(arcnet_unregister_proto
);
93 EXPORT_SYMBOL(arcnet_debug
);
94 EXPORT_SYMBOL(arcdev_setup
);
95 EXPORT_SYMBOL(alloc_arcdev
);
96 EXPORT_SYMBOL(arcnet_interrupt
);
98 /* Internal function prototypes */
99 static int arcnet_open(struct net_device
*dev
);
100 static int arcnet_close(struct net_device
*dev
);
101 static int arcnet_send_packet(struct sk_buff
*skb
, struct net_device
*dev
);
102 static void arcnet_timeout(struct net_device
*dev
);
103 static int arcnet_header(struct sk_buff
*skb
, struct net_device
*dev
,
104 unsigned short type
, void *daddr
, void *saddr
,
106 static int arcnet_rebuild_header(struct sk_buff
*skb
);
107 static struct net_device_stats
*arcnet_get_stats(struct net_device
*dev
);
108 static int go_tx(struct net_device
*dev
);
110 static int debug
= ARCNET_DEBUG
;
111 MODULE_PARM(debug
, "i");
112 MODULE_LICENSE("GPL");
114 static int __init
arcnet_init(void)
118 arcnet_debug
= debug
;
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\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"
133 /* initialize the protocol map */
134 arc_proto_default
= arc_bcast_proto
= &arc_proto_null
;
135 for (count
= 0; count
< 256; count
++)
136 arc_proto_map
[count
] = arc_proto_default
;
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
));
147 static void __exit
arcnet_exit(void)
151 module_init(arcnet_init
);
152 module_exit(arcnet_exit
);
155 * Dump the contents of an sk_buff
157 #if ARCNET_DEBUG_MAX & D_SKB
158 void arcnet_dump_skb(struct net_device
*dev
, struct sk_buff
*skb
, char *desc
)
162 printk(KERN_DEBUG
"%6s: skb dump (%s) follows:", dev
->name
, desc
);
163 for (i
= 0; i
< skb
->len
; i
++) {
165 printk("\n" KERN_DEBUG
"[%04X] ", i
);
166 printk("%02X ", ((u_char
*) skb
->data
)[i
]);
171 EXPORT_SYMBOL(arcnet_dump_skb
);
176 * Dump the contents of an ARCnet buffer
178 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
179 void arcnet_dump_packet(struct net_device
*dev
, int bufnum
, char *desc
)
181 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
184 static uint8_t buf
[512];
186 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
188 spin_lock_irqsave(&arcnet_lock
, flags
);
189 lp
->hw
.copy_from_card(dev
, bufnum
, 0, buf
, 512);
190 spin_unlock_irqrestore(&arcnet_lock
, flags
);
192 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
193 length
= (buf
[2] ? 256 : 512);
195 printk(KERN_DEBUG
"%6s: packet dump (%s) follows:", dev
->name
, desc
);
196 for (i
= 0; i
< length
; i
++) {
198 printk("\n" KERN_DEBUG
"[%04X] ", i
);
199 printk("%02X ", buf
[i
]);
205 EXPORT_SYMBOL(arcnet_dump_packet
);
210 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
211 * are responsible for registering themselves, but the unregister routine
212 * is pretty generic so we'll do it here.
214 void arcnet_unregister_proto(struct ArcProto
*proto
)
218 if (arc_proto_default
== proto
)
219 arc_proto_default
= &arc_proto_null
;
220 if (arc_bcast_proto
== proto
)
221 arc_bcast_proto
= arc_proto_default
;
223 for (count
= 0; count
< 256; count
++) {
224 if (arc_proto_map
[count
] == proto
)
225 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
= (struct arcnet_local
*) dev
->priv
;
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
% 5)
249 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
250 BUGMSG2(D_DURING
, "\n");
256 * Get a buffer from the queue. If this returns -1, there are no buffers
259 static int get_arcbuf(struct net_device
*dev
)
261 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
264 if (!atomic_dec_and_test(&lp
->buf_lock
)) /* already in this function */
265 BUGMSG(D_NORMAL
, "get_arcbuf: overlap (%d)!\n", lp
->buf_lock
.counter
);
266 else { /* we can continue */
267 if (lp
->next_buf
>= 5)
270 if (lp
->next_buf
== lp
->first_free_buf
)
271 BUGMSG(D_NORMAL
, "get_arcbuf: BUG: no buffers are available??\n");
273 buf
= lp
->buf_queue
[lp
->next_buf
++];
280 BUGMSG(D_DURING
, "get_arcbuf: got #%d; buffer queue is now: ", buf
);
281 for (i
= lp
->next_buf
; i
!= lp
->first_free_buf
; i
= ++i
% 5)
282 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
283 BUGMSG2(D_DURING
, "\n");
286 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
;
307 /* Setup a struct device for ARCnet. */
308 void arcdev_setup(struct net_device
*dev
)
310 dev
->type
= ARPHRD_ARCNET
;
311 dev
->hard_header_len
= sizeof(struct archdr
);
312 dev
->mtu
= choose_mtu();
314 dev
->addr_len
= ARCNET_ALEN
;
315 dev
->tx_queue_len
= 30;
316 dev
->broadcast
[0] = 0x00; /* for us, broadcasts are address 0 */
317 dev
->watchdog_timeo
= TX_TIMEOUT
;
319 /* New-style flags. */
320 dev
->flags
= IFF_BROADCAST
;
323 * Put in this stuff here, so we don't have to export the symbols to
324 * the chipset drivers.
326 dev
->open
= arcnet_open
;
327 dev
->stop
= arcnet_close
;
328 dev
->hard_start_xmit
= arcnet_send_packet
;
329 dev
->tx_timeout
= arcnet_timeout
;
330 dev
->get_stats
= arcnet_get_stats
;
331 dev
->hard_header
= arcnet_header
;
332 dev
->rebuild_header
= arcnet_rebuild_header
;
335 struct net_device
*alloc_arcdev(char *name
)
337 return alloc_netdev(sizeof(struct arcnet_local
),
338 name
&& *name
? name
: "arc%d", arcdev_setup
);
342 * Open/initialize the board. This is called sometime after booting when
343 * the 'ifconfig' program is run.
345 * This routine should set everything up anew at each open, even registers
346 * that "should" only need to be set once at boot, so that there is
347 * non-reboot way to recover if something goes wrong.
349 static int arcnet_open(struct net_device
*dev
)
351 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
352 int count
, newmtu
, error
;
354 if (!try_module_get(lp
->hw
.owner
))
359 BUGMSG(D_PROTO
, "protocol map (default is '%c'): ",
360 arc_proto_default
->suffix
);
361 for (count
= 0; count
< 256; count
++)
362 BUGMSG2(D_PROTO
, "%c", arc_proto_map
[count
]->suffix
);
363 BUGMSG2(D_PROTO
, "\n");
367 BUGMSG(D_INIT
, "arcnet_open: resetting card.\n");
369 /* try to put the card in a defined state - if it fails the first
370 * time, actually reset it.
373 if (ARCRESET(0) && ARCRESET(1))
376 newmtu
= choose_mtu();
377 if (newmtu
< dev
->mtu
)
380 /* autodetect the encapsulation for each host. */
381 memset(lp
->default_proto
, 0, sizeof(lp
->default_proto
));
383 /* the broadcast address is special - use the 'bcast' protocol */
384 for (count
= 0; count
< 256; count
++) {
385 if (arc_proto_map
[count
] == arc_bcast_proto
) {
386 lp
->default_proto
[0] = count
;
391 /* initialize buffers */
392 atomic_set(&lp
->buf_lock
, 1);
393 lp
->next_buf
= lp
->first_free_buf
= 0;
394 release_arcbuf(dev
, 0);
395 release_arcbuf(dev
, 1);
396 release_arcbuf(dev
, 2);
397 release_arcbuf(dev
, 3);
398 lp
->cur_tx
= lp
->next_tx
= -1;
401 lp
->rfc1201
.sequence
= 1;
403 /* bring up the hardware driver */
407 if (dev
->dev_addr
[0] == 0)
408 BUGMSG(D_NORMAL
, "WARNING! Station address 00 is reserved "
409 "for broadcasts!\n");
410 else if (dev
->dev_addr
[0] == 255)
411 BUGMSG(D_NORMAL
, "WARNING! Station address FF may confuse "
412 "DOS networking programs!\n");
414 if (ASTATUS() & RESETflag
)
415 ACOMMAND(CFLAGScmd
| RESETclear
);
417 /* make sure we're ready to receive IRQ's. */
419 udelay(1); /* give it time to set the mask before
420 * we reset it again. (may not even be
423 lp
->intmask
= NORXflag
| RECONflag
;
424 AINTMASK(lp
->intmask
);
426 netif_start_queue(dev
);
431 module_put(lp
->hw
.owner
);
436 /* The inverse routine to arcnet_open - shuts down the card. */
437 static int arcnet_close(struct net_device
*dev
)
439 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
441 netif_stop_queue(dev
);
443 /* flush TX and disable RX */
445 ACOMMAND(NOTXcmd
); /* stop transmit */
446 ACOMMAND(NORXcmd
); /* disable receive */
449 /* shut down the card */
451 module_put(lp
->hw
.owner
);
456 static int arcnet_header(struct sk_buff
*skb
, struct net_device
*dev
,
457 unsigned short type
, void *daddr
, void *saddr
,
460 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
461 uint8_t _daddr
, proto_num
;
462 struct ArcProto
*proto
;
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,
471 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
475 * if the dest addr isn't provided, we can't choose an encapsulation!
476 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
477 * real header when we do rebuild_header.
480 *(uint16_t *) skb_push(skb
, 2) = type
;
481 if (skb
->nh
.raw
- skb
->mac
.raw
!= 2)
482 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! diff (%d) is not 2!\n",
483 (int)(skb
->nh
.raw
- skb
->mac
.raw
));
484 return -2; /* return error -- can't transmit yet! */
486 /* otherwise, we can just add the header as usual. */
487 _daddr
= *(uint8_t *) daddr
;
488 proto_num
= lp
->default_proto
[_daddr
];
489 proto
= arc_proto_map
[proto_num
];
490 BUGMSG(D_DURING
, "building header for %02Xh using protocol '%c'\n",
491 proto_num
, proto
->suffix
);
492 if (proto
== &arc_proto_null
&& arc_bcast_proto
!= proto
) {
493 BUGMSG(D_DURING
, "actually, let's use '%c' instead.\n",
494 arc_bcast_proto
->suffix
);
495 proto
= arc_bcast_proto
;
497 return proto
->build_header(skb
, dev
, type
, _daddr
);
502 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
503 * future other address resolution) has completed on this sk_buff. We now
504 * let ARP fill in the destination field.
506 static int arcnet_rebuild_header(struct sk_buff
*skb
)
508 struct net_device
*dev
= skb
->dev
;
509 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
510 int status
= 0; /* default is failure */
513 struct ArcProto
*proto
;
515 if (skb
->nh
.raw
- skb
->mac
.raw
!= 2) {
517 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
518 (int)(skb
->nh
.raw
- skb
->mac
.raw
));
521 type
= *(uint16_t *) skb_pull(skb
, 2);
523 if (type
== ETH_P_IP
) {
525 BUGMSG(D_DURING
, "rebuild header for ethernet protocol %Xh\n", type
);
526 status
= arp_find(&daddr
, skb
) ? 1 : 0;
527 BUGMSG(D_DURING
, " rebuilt: dest is %d; protocol %Xh\n",
532 "I don't understand ethernet protocol %Xh addresses!\n", type
);
533 lp
->stats
.tx_errors
++;
534 lp
->stats
.tx_aborted_errors
++;
537 /* if we couldn't resolve the address... give up. */
541 /* add the _real_ header this time! */
542 proto
= arc_proto_map
[lp
->default_proto
[daddr
]];
543 proto
->build_header(skb
, dev
, type
, daddr
);
545 return 1; /* success */
550 /* Called by the kernel in order to transmit a packet. */
551 static int arcnet_send_packet(struct sk_buff
*skb
, struct net_device
*dev
)
553 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
555 struct arc_rfc1201
*soft
;
556 struct ArcProto
*proto
;
560 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d)\n",
561 ASTATUS(), lp
->cur_tx
, lp
->next_tx
, skb
->len
);
563 pkt
= (struct archdr
*) skb
->data
;
564 soft
= &pkt
->soft
.rfc1201
;
565 proto
= arc_proto_map
[soft
->proto
];
567 BUGMSG(D_SKB_SIZE
, "skb: transmitting %d bytes to %02X\n",
568 skb
->len
, pkt
->hard
.dest
);
569 BUGLVL(D_SKB
) arcnet_dump_skb(dev
, skb
, "tx");
571 /* fits in one packet? */
572 if (skb
->len
- ARC_HDR_SIZE
> XMTU
&& !proto
->continue_tx
) {
573 BUGMSG(D_NORMAL
, "fixme: packet too large: compensating badly!\n");
575 return 0; /* don't try again */
578 /* We're busy transmitting a packet... */
579 netif_stop_queue(dev
);
583 txbuf
= get_arcbuf(dev
);
585 if (proto
->prepare_tx(dev
, pkt
, skb
->len
, txbuf
)) {
586 /* done right away */
587 lp
->stats
.tx_bytes
+= skb
->len
;
590 /* do it the 'split' way */
591 lp
->outgoing
.proto
= proto
;
592 lp
->outgoing
.skb
= skb
;
593 lp
->outgoing
.pkt
= pkt
;
595 if (!proto
->continue_tx
)
596 BUGMSG(D_NORMAL
, "bug! prep_tx==0, but no continue_tx!\n");
597 else if (proto
->continue_tx(dev
, txbuf
)) {
599 "bug! continue_tx finished the first time! "
600 "(proto='%c')\n", proto
->suffix
);
608 /* make sure we didn't ignore a TX IRQ while we were in here */
610 lp
->intmask
|= TXFREEflag
;
611 AINTMASK(lp
->intmask
);
613 return 0; /* no need to try again */
618 * Actually start transmitting a packet that was loaded into a buffer
619 * by prepare_tx. This should _only_ be called by the interrupt handler.
621 static int go_tx(struct net_device
*dev
)
623 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
625 BUGMSG(D_DURING
, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
626 ASTATUS(), lp
->intmask
, lp
->next_tx
, lp
->cur_tx
);
628 if (lp
->cur_tx
!= -1 || lp
->next_tx
== -1)
631 BUGLVL(D_TX
) arcnet_dump_packet(dev
, lp
->next_tx
, "go_tx");
633 lp
->cur_tx
= lp
->next_tx
;
637 ACOMMAND(TXcmd
| (lp
->cur_tx
<< 3));
639 dev
->trans_start
= jiffies
;
640 lp
->stats
.tx_packets
++;
641 lp
->lasttrans_dest
= lp
->lastload_dest
;
642 lp
->lastload_dest
= 0;
643 lp
->intmask
|= TXFREEflag
;
649 /* Called by the kernel when transmit times out */
650 static void arcnet_timeout(struct net_device
*dev
)
653 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
654 int status
= ASTATUS();
657 spin_lock_irqsave(&arcnet_lock
, flags
);
658 if (status
& TXFREEflag
) { /* transmit _DID_ finish */
659 msg
= " - missed IRQ?";
662 lp
->stats
.tx_aborted_errors
++;
664 ACOMMAND(NOTXcmd
| (lp
->cur_tx
<< 3));
666 lp
->stats
.tx_errors
++;
668 /* make sure we didn't miss a TX IRQ */
670 lp
->intmask
|= TXFREEflag
;
671 AINTMASK(lp
->intmask
);
673 spin_unlock_irqrestore(&arcnet_lock
, flags
);
675 if (jiffies
- lp
->last_timeout
> 10*HZ
) {
676 BUGMSG(D_EXTRA
, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
677 msg
, status
, lp
->intmask
, lp
->lasttrans_dest
);
678 lp
->last_timeout
= jiffies
;
681 if (lp
->cur_tx
== -1)
682 netif_wake_queue(dev
);
687 * The typical workload of the driver: Handle the network interface
688 * interrupts. Establish which device needs attention, and call the correct
689 * chipset interrupt handler.
691 irqreturn_t
arcnet_interrupt(int irq
, void *dev_id
, struct pt_regs
*regs
)
693 struct net_device
*dev
= dev_id
;
694 struct arcnet_local
*lp
;
695 int recbuf
, status
, didsomething
, boguscount
;
697 BUGMSG(D_DURING
, "\n");
699 BUGMSG(D_DURING
, "in arcnet_interrupt\n");
701 spin_lock(&arcnet_lock
);
703 lp
= (struct arcnet_local
*) dev
->priv
;
708 * RESET flag was enabled - if device is not running, we must clear it right
709 * away (but nothing else).
711 if (!netif_running(dev
)) {
712 if (ASTATUS() & RESETflag
)
713 ACOMMAND(CFLAGScmd
| RESETclear
);
715 spin_unlock(&arcnet_lock
);
719 BUGMSG(D_DURING
, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
720 ASTATUS(), lp
->intmask
);
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
);
764 /* a transmit finished, and we're interested in it. */
765 if ((status
& lp
->intmask
& TXFREEflag
) || lp
->timed_out
) {
766 lp
->intmask
&= ~TXFREEflag
;
768 BUGMSG(D_DURING
, "TX IRQ (stat=%Xh)\n", status
);
770 if (lp
->cur_tx
!= -1 && !(status
& TXACKflag
) && !lp
->timed_out
) {
771 if (lp
->lasttrans_dest
!= 0) {
772 BUGMSG(D_EXTRA
, "transmit was not acknowledged! "
773 "(status=%Xh, dest=%02Xh)\n",
774 status
, lp
->lasttrans_dest
);
775 lp
->stats
.tx_errors
++;
776 lp
->stats
.tx_carrier_errors
++;
779 "broadcast was not acknowledged; that's normal "
780 "(status=%Xh, dest=%02Xh)\n",
781 status
, lp
->lasttrans_dest
);
784 if (lp
->cur_tx
!= -1)
785 release_arcbuf(dev
, lp
->cur_tx
);
791 /* send another packet if there is one */
794 /* continue a split packet, if any */
795 if (lp
->outgoing
.proto
&& lp
->outgoing
.proto
->continue_tx
) {
796 int txbuf
= get_arcbuf(dev
);
798 if (lp
->outgoing
.proto
->continue_tx(dev
, txbuf
)) {
799 /* that was the last segment */
800 lp
->stats
.tx_bytes
+= lp
->outgoing
.skb
->len
;
801 dev_kfree_skb_irq(lp
->outgoing
.skb
);
802 lp
->outgoing
.proto
= NULL
;
807 /* inform upper layers of idleness, if necessary */
808 if (lp
->cur_tx
== -1)
809 netif_wake_queue(dev
);
811 /* now process the received packet, if any */
813 BUGLVL(D_RX
) arcnet_dump_packet(dev
, recbuf
, "rx irq");
815 arcnet_rx(dev
, recbuf
);
816 release_arcbuf(dev
, recbuf
);
820 if (status
& lp
->intmask
& RECONflag
) {
821 ACOMMAND(CFLAGScmd
| CONFIGclear
);
822 lp
->stats
.tx_carrier_errors
++;
824 BUGMSG(D_RECON
, "Network reconfiguration detected (status=%Xh)\n",
827 /* is the RECON info empty or old? */
828 if (!lp
->first_recon
|| !lp
->last_recon
||
829 jiffies
- lp
->last_recon
> HZ
* 10) {
830 if (lp
->network_down
)
831 BUGMSG(D_NORMAL
, "reconfiguration detected: cabling restored?\n");
832 lp
->first_recon
= lp
->last_recon
= jiffies
;
833 lp
->num_recons
= lp
->network_down
= 0;
835 BUGMSG(D_DURING
, "recon: clearing counters.\n");
836 } else { /* add to current RECON counter */
837 lp
->last_recon
= jiffies
;
840 BUGMSG(D_DURING
, "recon: counter=%d, time=%lds, net=%d\n",
842 (lp
->last_recon
- lp
->first_recon
) / HZ
,
845 /* if network is marked up;
846 * and first_recon and last_recon are 60+ apart;
847 * and the average no. of recons counted is
848 * > RECON_THRESHOLD/min;
849 * then print a warning message.
851 if (!lp
->network_down
852 && (lp
->last_recon
- lp
->first_recon
) <= HZ
* 60
853 && lp
->num_recons
>= RECON_THRESHOLD
) {
854 lp
->network_down
= 1;
855 BUGMSG(D_NORMAL
, "many reconfigurations detected: cabling problem?\n");
856 } else if (!lp
->network_down
857 && lp
->last_recon
- lp
->first_recon
> HZ
* 60) {
858 /* reset counters if we've gone for over a minute. */
859 lp
->first_recon
= lp
->last_recon
;
863 } else if (lp
->network_down
&& jiffies
- lp
->last_recon
> HZ
* 10) {
864 if (lp
->network_down
)
865 BUGMSG(D_NORMAL
, "cabling restored?\n");
866 lp
->first_recon
= lp
->last_recon
= 0;
867 lp
->num_recons
= lp
->network_down
= 0;
869 BUGMSG(D_DURING
, "not recon: clearing counters anyway.\n");
872 while (--boguscount
&& didsomething
);
874 BUGMSG(D_DURING
, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
875 ASTATUS(), boguscount
);
876 BUGMSG(D_DURING
, "\n");
881 AINTMASK(lp
->intmask
);
883 spin_unlock(&arcnet_lock
);
884 return IRQ_RETVAL(didsomething
);
889 * This is a generic packet receiver that calls arcnet??_rx depending on the
892 void arcnet_rx(struct net_device
*dev
, int bufnum
)
894 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
896 struct arc_rfc1201
*soft
;
899 soft
= &pkt
.soft
.rfc1201
;
901 lp
->hw
.copy_from_card(dev
, bufnum
, 0, &pkt
, sizeof(ARC_HDR_SIZE
));
902 if (pkt
.hard
.offset
[0]) {
903 ofs
= pkt
.hard
.offset
[0];
906 ofs
= pkt
.hard
.offset
[1];
910 /* get the full header, if possible */
911 if (sizeof(pkt
.soft
) < length
)
912 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, sizeof(pkt
.soft
));
914 memset(&pkt
.soft
, 0, sizeof(pkt
.soft
));
915 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, length
);
918 BUGMSG(D_DURING
, "Buffer #%d: received packet from %02Xh to %02Xh "
920 bufnum
, pkt
.hard
.source
, pkt
.hard
.dest
, length
);
922 lp
->stats
.rx_packets
++;
923 lp
->stats
.rx_bytes
+= length
+ ARC_HDR_SIZE
;
925 /* call the right receiver for the protocol */
926 if (arc_proto_map
[soft
->proto
] != &arc_proto_null
) {
929 *oldp
= arc_proto_map
[lp
->default_proto
[pkt
.hard
.source
]],
930 *newp
= arc_proto_map
[soft
->proto
];
934 "got protocol %02Xh; encap for host %02Xh is now '%c'"
935 " (was '%c')\n", soft
->proto
, pkt
.hard
.source
,
936 newp
->suffix
, oldp
->suffix
);
940 /* broadcasts will always be done with the last-used encap. */
941 lp
->default_proto
[0] = soft
->proto
;
943 /* in striking contrast, the following isn't a hack. */
944 lp
->default_proto
[pkt
.hard
.source
] = soft
->proto
;
946 /* call the protocol-specific receiver. */
947 arc_proto_map
[soft
->proto
]->rx(dev
, bufnum
, &pkt
, length
);
953 * Get the current statistics. This may be called with the card open or
956 static struct net_device_stats
*arcnet_get_stats(struct net_device
*dev
)
958 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
963 static void null_rx(struct net_device
*dev
, int bufnum
,
964 struct archdr
*pkthdr
, int length
)
967 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
968 pkthdr
->soft
.rfc1201
.proto
, pkthdr
->hard
.source
);
972 static int null_build_header(struct sk_buff
*skb
, struct net_device
*dev
,
973 unsigned short type
, uint8_t daddr
)
975 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
978 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
979 lp
->default_proto
[daddr
]);
986 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
987 static int null_prepare_tx(struct net_device
*dev
, struct archdr
*pkt
,
988 int length
, int bufnum
)
990 struct arcnet_local
*lp
= (struct arcnet_local
*) dev
->priv
;
991 struct arc_hardware newpkt
;
993 BUGMSG(D_PROTO
, "tx: no encap for this host; load a protocol driver.\n");
995 /* send a packet to myself -- will never get received, of course */
996 newpkt
.source
= newpkt
.dest
= dev
->dev_addr
[0];
998 /* only one byte of actual data (and it's random) */
999 newpkt
.offset
[0] = 0xFF;
1001 lp
->hw
.copy_to_card(dev
, bufnum
, 0, &newpkt
, ARC_HDR_SIZE
);
1003 return 1; /* done */