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 arcnet_rebuild_header(struct sk_buff
*skb
);
108 static int go_tx(struct net_device
*dev
);
110 static int debug
= ARCNET_DEBUG
;
111 module_param(debug
, int, 0);
112 MODULE_LICENSE("GPL");
114 static int __init
arcnet_init(void)
118 arcnet_debug
= debug
;
120 printk("arcnet loaded.\n");
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_raw_proto
= arc_proto_default
= arc_bcast_proto
= &arc_proto_null
;
135 for (count
= 0; count
< 256; count
++)
136 arc_proto_map
[count
] = arc_proto_default
;
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
,
159 struct sk_buff
*skb
, char *desc
)
163 /* dump the packet */
164 snprintf(hdr
, sizeof(hdr
), "%6s:%s skb->data:", dev
->name
, desc
);
165 print_hex_dump(KERN_DEBUG
, hdr
, DUMP_PREFIX_OFFSET
,
166 16, 1, skb
->data
, skb
->len
, true);
169 EXPORT_SYMBOL(arcnet_dump_skb
);
174 * Dump the contents of an ARCnet buffer
176 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
177 static void arcnet_dump_packet(struct net_device
*dev
, int bufnum
,
178 char *desc
, int take_arcnet_lock
)
180 struct arcnet_local
*lp
= netdev_priv(dev
);
182 unsigned long flags
= 0;
183 static uint8_t buf
[512];
186 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
189 spin_lock_irqsave(&lp
->lock
, flags
);
191 lp
->hw
.copy_from_card(dev
, bufnum
, 0, buf
, 512);
193 spin_unlock_irqrestore(&lp
->lock
, flags
);
195 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
196 length
= (buf
[2] ? 256 : 512);
198 /* dump the packet */
199 snprintf(hdr
, sizeof(hdr
), "%6s:%s packet dump:", dev
->name
, desc
);
200 print_hex_dump(KERN_DEBUG
, hdr
, DUMP_PREFIX_OFFSET
,
201 16, 1, buf
, length
, true);
206 #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
212 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
213 * are responsible for registering themselves, but the unregister routine
214 * is pretty generic so we'll do it here.
216 void arcnet_unregister_proto(struct ArcProto
*proto
)
220 if (arc_proto_default
== proto
)
221 arc_proto_default
= &arc_proto_null
;
222 if (arc_bcast_proto
== proto
)
223 arc_bcast_proto
= arc_proto_default
;
224 if (arc_raw_proto
== proto
)
225 arc_raw_proto
= arc_proto_default
;
227 for (count
= 0; count
< 256; count
++) {
228 if (arc_proto_map
[count
] == proto
)
229 arc_proto_map
[count
] = arc_proto_default
;
235 * Add a buffer to the queue. Only the interrupt handler is allowed to do
236 * this, unless interrupts are disabled.
238 * Note: we don't check for a full queue, since there aren't enough buffers
239 * to more than fill it.
241 static void release_arcbuf(struct net_device
*dev
, int bufnum
)
243 struct arcnet_local
*lp
= netdev_priv(dev
);
246 lp
->buf_queue
[lp
->first_free_buf
++] = bufnum
;
247 lp
->first_free_buf
%= 5;
250 BUGMSG(D_DURING
, "release_arcbuf: freed #%d; buffer queue is now: ",
252 for (i
= lp
->next_buf
; i
!= lp
->first_free_buf
; i
= (i
+1) % 5)
253 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
254 BUGMSG2(D_DURING
, "\n");
260 * Get a buffer from the queue. If this returns -1, there are no buffers
263 static int get_arcbuf(struct net_device
*dev
)
265 struct arcnet_local
*lp
= netdev_priv(dev
);
268 if (!atomic_dec_and_test(&lp
->buf_lock
)) {
269 /* already in this function */
270 BUGMSG(D_NORMAL
, "get_arcbuf: overlap (%d)!\n",
271 lp
->buf_lock
.counter
);
273 else { /* we can continue */
274 if (lp
->next_buf
>= 5)
277 if (lp
->next_buf
== lp
->first_free_buf
)
278 BUGMSG(D_NORMAL
, "get_arcbuf: BUG: no buffers are available??\n");
280 buf
= lp
->buf_queue
[lp
->next_buf
++];
287 BUGMSG(D_DURING
, "get_arcbuf: got #%d; buffer queue is now: ", buf
);
288 for (i
= lp
->next_buf
; i
!= lp
->first_free_buf
; i
= (i
+1) % 5)
289 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
290 BUGMSG2(D_DURING
, "\n");
293 atomic_inc(&lp
->buf_lock
);
298 static int choose_mtu(void)
300 int count
, mtu
= 65535;
302 /* choose the smallest MTU of all available encaps */
303 for (count
= 0; count
< 256; count
++) {
304 if (arc_proto_map
[count
] != &arc_proto_null
&&
305 arc_proto_map
[count
]->mtu
< mtu
) {
306 mtu
= arc_proto_map
[count
]->mtu
;
310 return mtu
== 65535 ? XMTU
: mtu
;
313 static const struct header_ops arcnet_header_ops
= {
314 .create
= arcnet_header
,
315 .rebuild
= arcnet_rebuild_header
,
318 static const struct net_device_ops arcnet_netdev_ops
= {
319 .ndo_open
= arcnet_open
,
320 .ndo_stop
= arcnet_close
,
321 .ndo_start_xmit
= arcnet_send_packet
,
322 .ndo_tx_timeout
= arcnet_timeout
,
325 /* Setup a struct device for ARCnet. */
326 static void arcdev_setup(struct net_device
*dev
)
328 dev
->type
= ARPHRD_ARCNET
;
329 dev
->netdev_ops
= &arcnet_netdev_ops
;
330 dev
->header_ops
= &arcnet_header_ops
;
331 dev
->hard_header_len
= sizeof(struct archdr
);
332 dev
->mtu
= choose_mtu();
334 dev
->addr_len
= ARCNET_ALEN
;
335 dev
->tx_queue_len
= 100;
336 dev
->broadcast
[0] = 0x00; /* for us, broadcasts are address 0 */
337 dev
->watchdog_timeo
= TX_TIMEOUT
;
339 /* New-style flags. */
340 dev
->flags
= IFF_BROADCAST
;
344 struct net_device
*alloc_arcdev(const char *name
)
346 struct net_device
*dev
;
348 dev
= alloc_netdev(sizeof(struct arcnet_local
),
349 name
&& *name
? name
: "arc%d", arcdev_setup
);
351 struct arcnet_local
*lp
= netdev_priv(dev
);
352 spin_lock_init(&lp
->lock
);
359 * Open/initialize the board. This is called sometime after booting when
360 * the 'ifconfig' program is run.
362 * This routine should set everything up anew at each open, even registers
363 * that "should" only need to be set once at boot, so that there is
364 * non-reboot way to recover if something goes wrong.
366 int arcnet_open(struct net_device
*dev
)
368 struct arcnet_local
*lp
= netdev_priv(dev
);
369 int count
, newmtu
, error
;
371 BUGMSG(D_INIT
,"opened.");
373 if (!try_module_get(lp
->hw
.owner
))
377 BUGMSG(D_PROTO
, "protocol map (default is '%c'): ",
378 arc_proto_default
->suffix
);
379 for (count
= 0; count
< 256; count
++)
380 BUGMSG2(D_PROTO
, "%c", arc_proto_map
[count
]->suffix
);
381 BUGMSG2(D_PROTO
, "\n");
385 BUGMSG(D_INIT
, "arcnet_open: resetting card.\n");
387 /* try to put the card in a defined state - if it fails the first
388 * time, actually reset it.
391 if (ARCRESET(0) && ARCRESET(1))
394 newmtu
= choose_mtu();
395 if (newmtu
< dev
->mtu
)
398 BUGMSG(D_INIT
, "arcnet_open: mtu: %d.\n", dev
->mtu
);
400 /* autodetect the encapsulation for each host. */
401 memset(lp
->default_proto
, 0, sizeof(lp
->default_proto
));
403 /* the broadcast address is special - use the 'bcast' protocol */
404 for (count
= 0; count
< 256; count
++) {
405 if (arc_proto_map
[count
] == arc_bcast_proto
) {
406 lp
->default_proto
[0] = count
;
411 /* initialize buffers */
412 atomic_set(&lp
->buf_lock
, 1);
414 lp
->next_buf
= lp
->first_free_buf
= 0;
415 release_arcbuf(dev
, 0);
416 release_arcbuf(dev
, 1);
417 release_arcbuf(dev
, 2);
418 release_arcbuf(dev
, 3);
419 lp
->cur_tx
= lp
->next_tx
= -1;
422 lp
->rfc1201
.sequence
= 1;
424 /* bring up the hardware driver */
428 if (dev
->dev_addr
[0] == 0)
429 BUGMSG(D_NORMAL
, "WARNING! Station address 00 is reserved "
430 "for broadcasts!\n");
431 else if (dev
->dev_addr
[0] == 255)
432 BUGMSG(D_NORMAL
, "WARNING! Station address FF may confuse "
433 "DOS networking programs!\n");
435 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
436 if (ASTATUS() & RESETflag
) {
437 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
438 ACOMMAND(CFLAGScmd
| RESETclear
);
442 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
443 /* make sure we're ready to receive IRQ's. */
445 udelay(1); /* give it time to set the mask before
446 * we reset it again. (may not even be
449 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
450 lp
->intmask
= NORXflag
| RECONflag
;
451 AINTMASK(lp
->intmask
);
452 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
454 netif_start_queue(dev
);
459 module_put(lp
->hw
.owner
);
464 /* The inverse routine to arcnet_open - shuts down the card. */
465 int arcnet_close(struct net_device
*dev
)
467 struct arcnet_local
*lp
= netdev_priv(dev
);
469 netif_stop_queue(dev
);
471 /* flush TX and disable RX */
473 ACOMMAND(NOTXcmd
); /* stop transmit */
474 ACOMMAND(NORXcmd
); /* disable receive */
477 /* shut down the card */
479 module_put(lp
->hw
.owner
);
484 static int arcnet_header(struct sk_buff
*skb
, struct net_device
*dev
,
485 unsigned short type
, const void *daddr
,
486 const void *saddr
, unsigned len
)
488 const struct arcnet_local
*lp
= netdev_priv(dev
);
489 uint8_t _daddr
, proto_num
;
490 struct ArcProto
*proto
;
493 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
494 saddr
? *(uint8_t *) saddr
: -1,
495 daddr
? *(uint8_t *) daddr
: -1,
498 if (skb
->len
!=0 && len
!= skb
->len
)
499 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
503 /* Type is host order - ? */
504 if(type
== ETH_P_ARCNET
) {
505 proto
= arc_raw_proto
;
506 BUGMSG(D_DEBUG
, "arc_raw_proto used. proto='%c'\n",proto
->suffix
);
507 _daddr
= daddr
? *(uint8_t *) daddr
: 0;
511 * if the dest addr isn't provided, we can't choose an encapsulation!
512 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
513 * real header when we do rebuild_header.
515 *(uint16_t *) skb_push(skb
, 2) = type
;
516 if (skb
->network_header
- skb
->mac_header
!= 2)
517 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! diff (%d) is not 2!\n",
518 (int)(skb
->network_header
- skb
->mac_header
));
519 return -2; /* return error -- can't transmit yet! */
522 /* otherwise, we can just add the header as usual. */
523 _daddr
= *(uint8_t *) daddr
;
524 proto_num
= lp
->default_proto
[_daddr
];
525 proto
= arc_proto_map
[proto_num
];
526 BUGMSG(D_DURING
, "building header for %02Xh using protocol '%c'\n",
527 proto_num
, proto
->suffix
);
528 if (proto
== &arc_proto_null
&& arc_bcast_proto
!= proto
) {
529 BUGMSG(D_DURING
, "actually, let's use '%c' instead.\n",
530 arc_bcast_proto
->suffix
);
531 proto
= arc_bcast_proto
;
534 return proto
->build_header(skb
, dev
, type
, _daddr
);
539 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
540 * future other address resolution) has completed on this sk_buff. We now
541 * let ARP fill in the destination field.
543 static int arcnet_rebuild_header(struct sk_buff
*skb
)
545 struct net_device
*dev
= skb
->dev
;
546 struct arcnet_local
*lp
= netdev_priv(dev
);
547 int status
= 0; /* default is failure */
550 struct ArcProto
*proto
;
551 if (skb
->network_header
- skb
->mac_header
!= 2) {
553 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
554 (int)(skb
->network_header
- skb
->mac_header
));
557 type
= *(uint16_t *) skb_pull(skb
, 2);
558 BUGMSG(D_DURING
, "rebuild header for protocol %Xh\n", type
);
560 if (type
== ETH_P_IP
) {
562 BUGMSG(D_DURING
, "rebuild header for ethernet protocol %Xh\n", type
);
563 status
= arp_find(&daddr
, skb
) ? 1 : 0;
564 BUGMSG(D_DURING
, " rebuilt: dest is %d; protocol %Xh\n",
569 "I don't understand ethernet protocol %Xh addresses!\n", type
);
570 dev
->stats
.tx_errors
++;
571 dev
->stats
.tx_aborted_errors
++;
574 /* if we couldn't resolve the address... give up. */
578 /* add the _real_ header this time! */
579 proto
= arc_proto_map
[lp
->default_proto
[daddr
]];
580 proto
->build_header(skb
, dev
, type
, daddr
);
582 return 1; /* success */
587 /* Called by the kernel in order to transmit a packet. */
588 netdev_tx_t
arcnet_send_packet(struct sk_buff
*skb
,
589 struct net_device
*dev
)
591 struct arcnet_local
*lp
= netdev_priv(dev
);
593 struct arc_rfc1201
*soft
;
594 struct ArcProto
*proto
;
600 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
601 ASTATUS(), lp
->cur_tx
, lp
->next_tx
, skb
->len
,skb
->protocol
);
603 pkt
= (struct archdr
*) skb
->data
;
604 soft
= &pkt
->soft
.rfc1201
;
605 proto
= arc_proto_map
[soft
->proto
];
607 BUGMSG(D_SKB_SIZE
, "skb: transmitting %d bytes to %02X\n",
608 skb
->len
, pkt
->hard
.dest
);
609 BUGLVL(D_SKB
) arcnet_dump_skb(dev
, skb
, "tx");
611 /* fits in one packet? */
612 if (skb
->len
- ARC_HDR_SIZE
> XMTU
&& !proto
->continue_tx
) {
613 BUGMSG(D_NORMAL
, "fixme: packet too large: compensating badly!\n");
615 return NETDEV_TX_OK
; /* don't try again */
618 /* We're busy transmitting a packet... */
619 netif_stop_queue(dev
);
621 spin_lock_irqsave(&lp
->lock
, flags
);
623 if(lp
->next_tx
== -1)
624 txbuf
= get_arcbuf(dev
);
629 if (proto
->prepare_tx(dev
, pkt
, skb
->len
, txbuf
) &&
631 /* done right away and we don't want to acknowledge
632 the package later - forget about it now */
633 dev
->stats
.tx_bytes
+= skb
->len
;
636 /* do it the 'split' way */
637 lp
->outgoing
.proto
= proto
;
638 lp
->outgoing
.skb
= skb
;
639 lp
->outgoing
.pkt
= pkt
;
643 if (proto
->continue_tx
&&
644 proto
->continue_tx(dev
, txbuf
)) {
646 "bug! continue_tx finished the first time! "
647 "(proto='%c')\n", proto
->suffix
);
650 retval
= NETDEV_TX_OK
;
653 retval
= NETDEV_TX_BUSY
;
657 BUGMSG(D_DEBUG
, "%s: %d: %s, status: %x\n",__FILE__
,__LINE__
,__func__
,ASTATUS());
658 /* make sure we didn't ignore a TX IRQ while we were in here */
661 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
662 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
663 AINTMASK(lp
->intmask
);
664 BUGMSG(D_DEBUG
, "%s: %d: %s, status: %x\n",__FILE__
,__LINE__
,__func__
,ASTATUS());
666 spin_unlock_irqrestore(&lp
->lock
, flags
);
670 return retval
; /* no need to try again */
675 * Actually start transmitting a packet that was loaded into a buffer
676 * by prepare_tx. This should _only_ be called by the interrupt handler.
678 static int go_tx(struct net_device
*dev
)
680 struct arcnet_local
*lp
= netdev_priv(dev
);
682 BUGMSG(D_DURING
, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
683 ASTATUS(), lp
->intmask
, lp
->next_tx
, lp
->cur_tx
);
685 if (lp
->cur_tx
!= -1 || lp
->next_tx
== -1)
688 BUGLVL(D_TX
) arcnet_dump_packet(dev
, lp
->next_tx
, "go_tx", 0);
690 lp
->cur_tx
= lp
->next_tx
;
694 ACOMMAND(TXcmd
| (lp
->cur_tx
<< 3));
696 dev
->stats
.tx_packets
++;
697 lp
->lasttrans_dest
= lp
->lastload_dest
;
698 lp
->lastload_dest
= 0;
699 lp
->excnak_pending
= 0;
700 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
706 /* Called by the kernel when transmit times out */
707 void arcnet_timeout(struct net_device
*dev
)
710 struct arcnet_local
*lp
= netdev_priv(dev
);
711 int status
= ASTATUS();
714 spin_lock_irqsave(&lp
->lock
, flags
);
715 if (status
& TXFREEflag
) { /* transmit _DID_ finish */
716 msg
= " - missed IRQ?";
719 dev
->stats
.tx_aborted_errors
++;
721 ACOMMAND(NOTXcmd
| (lp
->cur_tx
<< 3));
723 dev
->stats
.tx_errors
++;
725 /* make sure we didn't miss a TX or a EXC NAK IRQ */
727 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
728 AINTMASK(lp
->intmask
);
730 spin_unlock_irqrestore(&lp
->lock
, flags
);
732 if (time_after(jiffies
, lp
->last_timeout
+ 10*HZ
)) {
733 BUGMSG(D_EXTRA
, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
734 msg
, status
, lp
->intmask
, lp
->lasttrans_dest
);
735 lp
->last_timeout
= jiffies
;
738 if (lp
->cur_tx
== -1)
739 netif_wake_queue(dev
);
744 * The typical workload of the driver: Handle the network interface
745 * interrupts. Establish which device needs attention, and call the correct
746 * chipset interrupt handler.
748 irqreturn_t
arcnet_interrupt(int irq
, void *dev_id
)
750 struct net_device
*dev
= dev_id
;
751 struct arcnet_local
*lp
;
752 int recbuf
, status
, diagstatus
, didsomething
, boguscount
;
753 int retval
= IRQ_NONE
;
755 BUGMSG(D_DURING
, "\n");
757 BUGMSG(D_DURING
, "in arcnet_interrupt\n");
759 lp
= netdev_priv(dev
);
762 spin_lock(&lp
->lock
);
765 * RESET flag was enabled - if device is not running, we must clear it right
766 * away (but nothing else).
768 if (!netif_running(dev
)) {
769 if (ASTATUS() & RESETflag
)
770 ACOMMAND(CFLAGScmd
| RESETclear
);
772 spin_unlock(&lp
->lock
);
776 BUGMSG(D_DURING
, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
777 ASTATUS(), lp
->intmask
);
782 diagstatus
= (status
>> 8) & 0xFF;
784 BUGMSG(D_DEBUG
, "%s: %d: %s: status=%x\n",
785 __FILE__
,__LINE__
,__func__
,status
);
789 * RESET flag was enabled - card is resetting and if RX is
790 * disabled, it's NOT because we just got a packet.
792 * The card is in an undefined state. Clear it out and start over.
794 if (status
& RESETflag
) {
795 BUGMSG(D_NORMAL
, "spurious reset (status=%Xh)\n", status
);
799 /* get out of the interrupt handler! */
803 * RX is inhibited - we must have received something. Prepare to
804 * receive into the next buffer.
806 * We don't actually copy the received packet from the card until
807 * after the transmit handler runs (and possibly launches the next
808 * tx); this should improve latency slightly if we get both types
809 * of interrupts at once.
812 if (status
& lp
->intmask
& NORXflag
) {
814 BUGMSG(D_DURING
, "Buffer #%d: receive irq (status=%Xh)\n",
817 lp
->cur_rx
= get_arcbuf(dev
);
818 if (lp
->cur_rx
!= -1) {
819 BUGMSG(D_DURING
, "enabling receive to buffer #%d\n",
821 ACOMMAND(RXcmd
| (lp
->cur_rx
<< 3) | RXbcasts
);
826 if((diagstatus
& EXCNAKflag
)) {
827 BUGMSG(D_DURING
, "EXCNAK IRQ (diagstat=%Xh)\n",
830 ACOMMAND(NOTXcmd
); /* disable transmit */
831 lp
->excnak_pending
= 1;
833 ACOMMAND(EXCNAKclear
);
834 lp
->intmask
&= ~(EXCNAKflag
);
839 /* a transmit finished, and we're interested in it. */
840 if ((status
& lp
->intmask
& TXFREEflag
) || lp
->timed_out
) {
841 lp
->intmask
&= ~(TXFREEflag
|EXCNAKflag
);
843 BUGMSG(D_DURING
, "TX IRQ (stat=%Xh)\n", status
);
845 if (lp
->cur_tx
!= -1 && !lp
->timed_out
) {
846 if(!(status
& TXACKflag
)) {
847 if (lp
->lasttrans_dest
!= 0) {
849 "transmit was not acknowledged! "
850 "(status=%Xh, dest=%02Xh)\n",
851 status
, lp
->lasttrans_dest
);
852 dev
->stats
.tx_errors
++;
853 dev
->stats
.tx_carrier_errors
++;
856 "broadcast was not acknowledged; that's normal "
857 "(status=%Xh, dest=%02Xh)\n",
858 status
, lp
->lasttrans_dest
);
862 if (lp
->outgoing
.proto
&&
863 lp
->outgoing
.proto
->ack_tx
) {
865 if(status
& TXACKflag
)
867 else if(lp
->excnak_pending
)
873 ->ack_tx(dev
, ackstatus
);
876 if (lp
->cur_tx
!= -1)
877 release_arcbuf(dev
, lp
->cur_tx
);
883 /* send another packet if there is one */
886 /* continue a split packet, if any */
887 if (lp
->outgoing
.proto
&& lp
->outgoing
.proto
->continue_tx
) {
888 int txbuf
= get_arcbuf(dev
);
890 if (lp
->outgoing
.proto
->continue_tx(dev
, txbuf
)) {
891 /* that was the last segment */
892 dev
->stats
.tx_bytes
+= lp
->outgoing
.skb
->len
;
893 if(!lp
->outgoing
.proto
->ack_tx
)
895 dev_kfree_skb_irq(lp
->outgoing
.skb
);
896 lp
->outgoing
.proto
= NULL
;
902 /* inform upper layers of idleness, if necessary */
903 if (lp
->cur_tx
== -1)
904 netif_wake_queue(dev
);
906 /* now process the received packet, if any */
908 BUGLVL(D_RX
) arcnet_dump_packet(dev
, recbuf
, "rx irq", 0);
910 arcnet_rx(dev
, recbuf
);
911 release_arcbuf(dev
, recbuf
);
915 if (status
& lp
->intmask
& RECONflag
) {
916 ACOMMAND(CFLAGScmd
| CONFIGclear
);
917 dev
->stats
.tx_carrier_errors
++;
919 BUGMSG(D_RECON
, "Network reconfiguration detected (status=%Xh)\n",
921 /* MYRECON bit is at bit 7 of diagstatus */
922 if(diagstatus
& 0x80)
923 BUGMSG(D_RECON
,"Put out that recon myself\n");
925 /* is the RECON info empty or old? */
926 if (!lp
->first_recon
|| !lp
->last_recon
||
927 time_after(jiffies
, lp
->last_recon
+ HZ
* 10)) {
928 if (lp
->network_down
)
929 BUGMSG(D_NORMAL
, "reconfiguration detected: cabling restored?\n");
930 lp
->first_recon
= lp
->last_recon
= jiffies
;
931 lp
->num_recons
= lp
->network_down
= 0;
933 BUGMSG(D_DURING
, "recon: clearing counters.\n");
934 } else { /* add to current RECON counter */
935 lp
->last_recon
= jiffies
;
938 BUGMSG(D_DURING
, "recon: counter=%d, time=%lds, net=%d\n",
940 (lp
->last_recon
- lp
->first_recon
) / HZ
,
943 /* if network is marked up;
944 * and first_recon and last_recon are 60+ apart;
945 * and the average no. of recons counted is
946 * > RECON_THRESHOLD/min;
947 * then print a warning message.
949 if (!lp
->network_down
&&
950 (lp
->last_recon
- lp
->first_recon
) <= HZ
* 60 &&
951 lp
->num_recons
>= RECON_THRESHOLD
) {
952 lp
->network_down
= 1;
953 BUGMSG(D_NORMAL
, "many reconfigurations detected: cabling problem?\n");
954 } else if (!lp
->network_down
&&
955 lp
->last_recon
- lp
->first_recon
> HZ
* 60) {
956 /* reset counters if we've gone for over a minute. */
957 lp
->first_recon
= lp
->last_recon
;
961 } else if (lp
->network_down
&&
962 time_after(jiffies
, lp
->last_recon
+ HZ
* 10)) {
963 if (lp
->network_down
)
964 BUGMSG(D_NORMAL
, "cabling restored?\n");
965 lp
->first_recon
= lp
->last_recon
= 0;
966 lp
->num_recons
= lp
->network_down
= 0;
968 BUGMSG(D_DURING
, "not recon: clearing counters anyway.\n");
972 retval
|= IRQ_HANDLED
;
975 while (--boguscount
&& didsomething
);
977 BUGMSG(D_DURING
, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
978 ASTATUS(), boguscount
);
979 BUGMSG(D_DURING
, "\n");
984 AINTMASK(lp
->intmask
);
986 spin_unlock(&lp
->lock
);
992 * This is a generic packet receiver that calls arcnet??_rx depending on the
995 static void arcnet_rx(struct net_device
*dev
, int bufnum
)
997 struct arcnet_local
*lp
= netdev_priv(dev
);
999 struct arc_rfc1201
*soft
;
1002 soft
= &pkt
.soft
.rfc1201
;
1004 lp
->hw
.copy_from_card(dev
, bufnum
, 0, &pkt
, sizeof(ARC_HDR_SIZE
));
1005 if (pkt
.hard
.offset
[0]) {
1006 ofs
= pkt
.hard
.offset
[0];
1009 ofs
= pkt
.hard
.offset
[1];
1013 /* get the full header, if possible */
1014 if (sizeof(pkt
.soft
) <= length
)
1015 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, sizeof(pkt
.soft
));
1017 memset(&pkt
.soft
, 0, sizeof(pkt
.soft
));
1018 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, length
);
1021 BUGMSG(D_DURING
, "Buffer #%d: received packet from %02Xh to %02Xh "
1023 bufnum
, pkt
.hard
.source
, pkt
.hard
.dest
, length
);
1025 dev
->stats
.rx_packets
++;
1026 dev
->stats
.rx_bytes
+= length
+ ARC_HDR_SIZE
;
1028 /* call the right receiver for the protocol */
1029 if (arc_proto_map
[soft
->proto
]->is_ip
) {
1032 *oldp
= arc_proto_map
[lp
->default_proto
[pkt
.hard
.source
]],
1033 *newp
= arc_proto_map
[soft
->proto
];
1037 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1038 " (was '%c')\n", soft
->proto
, pkt
.hard
.source
,
1039 newp
->suffix
, oldp
->suffix
);
1043 /* broadcasts will always be done with the last-used encap. */
1044 lp
->default_proto
[0] = soft
->proto
;
1046 /* in striking contrast, the following isn't a hack. */
1047 lp
->default_proto
[pkt
.hard
.source
] = soft
->proto
;
1049 /* call the protocol-specific receiver. */
1050 arc_proto_map
[soft
->proto
]->rx(dev
, bufnum
, &pkt
, length
);
1054 static void null_rx(struct net_device
*dev
, int bufnum
,
1055 struct archdr
*pkthdr
, int length
)
1058 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1059 pkthdr
->soft
.rfc1201
.proto
, pkthdr
->hard
.source
);
1063 static int null_build_header(struct sk_buff
*skb
, struct net_device
*dev
,
1064 unsigned short type
, uint8_t daddr
)
1066 struct arcnet_local
*lp
= netdev_priv(dev
);
1069 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1070 lp
->default_proto
[daddr
]);
1077 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1078 static int null_prepare_tx(struct net_device
*dev
, struct archdr
*pkt
,
1079 int length
, int bufnum
)
1081 struct arcnet_local
*lp
= netdev_priv(dev
);
1082 struct arc_hardware newpkt
;
1084 BUGMSG(D_PROTO
, "tx: no encap for this host; load a protocol driver.\n");
1086 /* send a packet to myself -- will never get received, of course */
1087 newpkt
.source
= newpkt
.dest
= dev
->dev_addr
[0];
1089 /* only one byte of actual data (and it's random) */
1090 newpkt
.offset
[0] = 0xFF;
1092 lp
->hw
.copy_to_card(dev
, bufnum
, 0, &newpkt
, ARC_HDR_SIZE
);
1094 return 1; /* done */